Komatsudump truck(no series)
Komatsu HD320-2(S/N 1005-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu HD320-2 (S/N 1005-UP) is a rigid-frame, rear-dump haul truck built for quarry and mine hauling, produced roughly from 1977 to 1984 as part of Komatsu's early HD-series lineup. It runs a mechanical, turbocharged Cummins NTA855-family inline-six diesel with no electronic engine controls, paired with an automatic torque-converter powershift transmission and an air-assisted brake and steering system. Loaded operating weight falls in the upper-50-tonne class with a rated payload in the high-20-tonne range, based on figures documented for the closely related generation that followed it; exact catalog weights specific to this serial range are not separately published, so verify against the nameplate and dealer records. The truck was offered as a standard rigid rock-body hauler; no factory options beyond the base configuration are documented for this range.
The HD320-2 replaced Komatsu's original early-1970s HD320 as the company adapted the design for mine and quarry duty, with a lower, wider dump body meant to shorten loading cycle times and a tighter turning radius suited to smaller pit layouts. It was succeeded in 1984 by the HD320-3 (S/N 2501-UP), which carried over the same Cummins NTA855 engine family but brought chassis, hydraulic, and running-gear updates. In today's used and parts market, the HD320-2 is valued for its mechanical simplicity: no electronic engine or transmission controls to fail, parts commonality with sibling Komatsu HD-series trucks of the same era, and a drivetrain that rebuilds well in operations that favor low-tech, long-service haul trucks over newer electronically controlled machines.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Komatsu HD320-2(S/N 1005-UP) specifications
Engine
| Gross power | 420 HP (313 kW) |
| Rated engine speed | 2300 rpm |
| Displacement | 14.01 L (855 cu in) |
| Cylinders | 6, inline, turbocharged diesel |
| Engine family | Cummins NTA-855-1A, from the N855-series diesel lineage (the same family carries a higher-output NTA855-C tune on this truck's next generation) |
| Emissions tier | Pre-emissions-tier mechanical diesel, no aftertreatment (1977-1984 production) |
Weights
| Operating weight (empty) | 27.2 t (59,966 lb) |
| Net load / payload | 32 t (70,548 lb) |
| Ground pressure | Not published for this model |
Dimensions
| Transport length | 7.8 m (25.6 ft) |
| Transport width | 3.67 m (12.0 ft) |
| Transport height | 3.95 m (13.0 ft) |
| Turning radius (outside) | 7.0 m (23.0 ft) |
| Loading height | 2.97 m (9.7 ft) |
| Standard tires | 18.00-25-32PR |
| Wheelbase / ground clearance | Not documented for this exact serial range — verify with your dealer |
Performance
| Heaped dump/body capacity | 24 m3 (31.4 cu yd) |
| Travel speed | Not documented for this exact serial range — verify with your dealer |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Fuel tank | Not documented for this exact serial range — verify with your dealer |
| Hydraulic system | Not documented for this exact serial range — verify with your dealer |
| Engine oil | Not documented for this exact serial range — verify with your dealer |
| Cooling system | Not documented for this exact serial range — verify with your dealer |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
HD320-2(S/N 1005-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) - Cummins NTA-855-1A | Not documented for this exact serial range in available factory literature - verify with your dealer/OMM; Cummins NTA855-family crankcases in this era typically run in the 30 to 40 L (8 to 10.5 US gal) class with filter | Diesel engine oil to Cummins/API CD-CE spec (Komatsu EO equivalent), multigrade 15W-40 as the general-duty grade; straight-grade 10W or 30 in sustained cold or hot ambient per the OMM's climate chart, matched to the mechanical (non-electronic) NTA-855-1A fuel system |
| Cooling system | Not documented for this exact serial range - verify with your dealer/OMM | Ethylene-glycol based antifreeze/coolant (Komatsu Genuine AF-NAC or equivalent supercoolant), mixed per ambient temperature chart; corrosion-resistor/SCA maintenance applies to the NTA-855-1A's wet-liner cylinder block |
| Fuel tank | Not documented for this exact serial range - verify with your dealer/OMM; contemporary Komatsu 30-plus ton rigid haulers of this class typically carry roughly 400 to 500 L (105 to 130 US gal) | No. 2-D diesel fuel; low-sulfur grade recommended, with a low-temperature blend called out for cold climates |
| Torque converter / powertrain (transmission) | Not documented for this exact serial range - verify with your dealer/OMM | Komatsu Genuine powertrain oil (TO series) or equivalent, viscosity graded by ambient temperature per the OMM's fluid chart |
| Rear axle / final drives (differential and wheel-end drives, combined housing) | Not documented for this exact serial range - verify with your dealer/OMM | Komatsu Genuine axle oil (AXO series, gear-oil class) or equivalent EP gear lubricant, viscosity selected by ambient temperature |
| Hydraulic system (hoist, steering, brake circuits and tank) | Not documented for this exact serial range - verify with your dealer/OMM | Komatsu Genuine hydraulic oil (HO series) or equivalent anti-wear hydraulic fluid, viscosity grade selected by seasonal/ambient temperature per the OMM chart |
| Grease (chassis, pins, bushings - spec only) | Not applicable (grease is applied per fitting, no system fill volume) | Komatsu Genuine multipurpose lithium-based grease (G2-LI class or equivalent NLGI 2 EP grease); molybdenum-disulfide grease (G2-Mo class) called out at specific high-load pivot points where the OMM specifies it |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu HD320-2(S/N 1005-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the HD320-2(S/N 1005-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
With no ECM or onboard diagnostics on the NTA855-family engine, oil sampling is the main early-warning tool on this truck. Pull engine, torque-converter/transmission, and axle differential oil samples on a fixed schedule to catch turbocharger bearing wear, powershift clutch pack degradation, and gear wear before failure. Watch coolant for oil or combustion contamination given the engine's age, and check axle oil for metal fines as a leading indicator of final-drive bearing wear.
Corrective & Common Repairs
Expect recurring work on the turbocharger, injector pump, and air compressor as the NTA855 accumulates hours, plus torque-converter and powershift clutch pack wear from repeated loaded-cycle shifting. Hoist cylinder seals and dump-body hinge pins wear from constant loading cycles and need regular inspection. Air brake chambers, relay valves, and steering linkage bushings are common failure points on trucks of this vintage and should be part of any corrective repair rotation.
Overhaul & Rebuild Points
Major rebuild points on this generation center on the NTA855 top end (liners, pistons, injectors), the torque converter and powershift clutch packs, and the axle differential and final drive assemblies. Frame rails, hoist cylinder mounts, and dump-body hinge pins should be checked for fatigue cracking given the truck's age. Wheel bearings, king pins, and steering knuckles typically need repacking or replacement at major overhaul intervals on trucks still in active service.
Seasonal & Environment Servicing
In cold climates, use a block or coolant heater to aid cold starts on the mechanical NTA855, since there is no electronic glow or ether-assist system to fall back on. In dusty quarry or mine environments, shorten air cleaner element service intervals and inspect the charge-air cooler for packed debris. In wet seasons, drain fuel-tank and air-tank moisture more often and check the dump body and frame for corrosion at pivot points.
HD320-2(S/N 1005-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 281-34-12600 | Air Filter Ass'Y | Air intake service | Check fitment → |
| 07000-02080 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 07000-02075 | O-Ring,Steering Oil Filter | Lubrication service | Check fitment → |
| 600-181-4211 | Element,Inner (Kit) | Scheduled service item | Check fitment → |
| 600-181-4311 | Element,Outer (Kit) | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
HD320-2(S/N 1005-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| OIL PRESSURE lamp (red) | Engine oil pressure below safe minimum | Low oil level, worn oil pump, clogged suction screen, or failed sender | Stop engine immediately, check oil level and check for leaks before restart |
| WATER TEMPERATURE lamp (red) | Engine coolant temperature above safe maximum | Low coolant, blocked radiator core, failed fan drive, or thermostat stuck closed | Idle down, verify coolant level once safe, inspect radiator and fan belt |
| CHARGE lamp (red) | Alternator not charging the battery circuit | Broken/slipping fan or alternator belt, failed alternator, or wiring fault | Check belt tension and condition, inspect alternator output and battery connections |
| AIR CLEANER RESTRICTION lamp (amber/yellow) | Intake air filter restriction has reached the service limit | Clogged primary air filter element from dust ingestion | Service or replace the air filter element, check for a damaged element or loose ducting |
| PARKING BRAKE lamp (red) | Parking/emergency brake is applied or its air/hydraulic supply is low | Brake left engaged, low system pressure, or a switch/wiring fault | Confirm parking brake lever position and check system pressure before moving the truck |
| BRAKE AIR/OIL PRESSURE lamp (red) | Service brake circuit pressure below the safe operating minimum | Low reservoir level, compressor or charging pump fault, or a system leak | Stop safely, do not move the truck, check reservoir level and have the brake circuit inspected |
| TORQUE CONVERTER OIL TEMP lamp (red) | Torque converter/transmission oil temperature above safe maximum | Low oil level, overloaded operation, or blocked oil cooler | Reduce load and let the unit cool, then check oil level and cooler condition |
| HYDRAULIC OIL TEMP lamp (red) | Hoist/steering hydraulic oil temperature above safe maximum | Low hydraulic oil level, clogged cooler, or sustained high-load operation | Reduce hydraulic demand, allow cooling, then check oil level and cooler for blockage |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
HD320-2(S/N 1005-UP) attachments & work tools
Attachment scope for this machine type
HD320-2 is a rigid-frame haul truck, not an excavator or loader. It has no quick-coupler work-tool system; the only interchangeable "tool" is the dump body/vessel itself, which is pinned to the frame and raised by twin hydraulic hoist cylinders.
Dump body / vessel
Standard vessel for this class is a rock-type body sized to the roughly 29 to 32 metric ton (32 to 35 US ton) payload bracket the HD320 family sits in, generation and configuration dependent. Bodies of this era are bolt-together steel construction rather than one-piece castings.
Body wear liners
Front, side, and floor liners (bolt-on abrasion plate) are the standard wear protection fitted inside the vessel to resist impact and gouging from loaded rock or ore. These are field-replaceable and sized to the vessel, not to a specific serial range.
Tailgate
An optional bolt-on tailgate is offered across this class of Komatsu rigid truck to raise struck/heaped capacity when hauling lighter, finer material such as coal or crushed aggregate. It is normally removed for blasted rock to prevent material hang-up during dumping.
Rear/underbody guarding
A rock-ejector or underbody deflector package, fitted near the rear frame and tires, is a common factory or dealer-fit option on this class of rigid truck to reduce tire and frame damage from spilled or carried-back material. Fitment for this exact serial range is not documented online; verify with the parts catalog.
Front suspension
Hydro-pneumatic strut suspension is the factory front-end system on the HD320-2, per its own parts breakdown, not a bolt-on option. No leaf-spring alternative is documented for this model.
Cold-weather body option
Exhaust-heated dump body (routing engine exhaust under the vessel floor) is offered on Komatsu rigid trucks in this size class to stop wet or frozen fines sticking to the floor. This is documented for related models in the family; confirm availability for the -2 series with a dealer.
Tires
Tire sizing follows the truck's payload class; Komatsu rigid trucks in the roughly 29 to 32 ton bracket commonly run in the 21.00-35 size range. Exact factory fitment for HD320-2 is not confirmed in available documentation — check the tire placard or dealer spec sheet.
All HD320-2(S/N 1005-UP) assemblies by section
Every catalogued assembly group for the Komatsu HD320-2(S/N 1005-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Drive Shaft? Differential And Wheels
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Differential
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Final Drive
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 18 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 12 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Front Axle
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 01***65 | Bolt, Mount Radiator To Frame (Bottom) | 8 |
| 01***70 | Bolt, Accumulator Mounting Bracket | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Front Brake
| 01***20 | Bolt,(Without Maintenance Monitor) | 16 |
| 01***12 | Bolt - Front Cover Mounting | 12 |
| 01***12 | Bolt - M8 - 1.25 X 12 | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Grease Piping(#1299-)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 11 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 8 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 11 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Hydro-Pneumatic Front Suspension
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 8 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***85 | Bolt,(For 2nd Travel Speed) (Op) | 15 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Hydro-Pneumatic Rear Suspension
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 9 |
| 01***85 | Bolt,(For 2nd Travel Speed) (Op) | 15 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 24 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Parking Brake
| 01***50 | Bolt,(With Service Valve R.H.) | 1 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 01***16 | Nut (Op) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Parking Brake Actuator
| 56***40 | Spring Cylinder A | 1 |
| 56***50 | Cylinder | 1 |
| 56***80 | Piston | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Parking Brake Actuator And Linkage
| 01***55 | Bolt | 4 |
| 01***13 | Nut,(See Fig.337) | 4 |
| 01***10 | Nut,(For Slag Handling) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Propeller Shaft
| 01***80 | Bolt | 8 |
| 01***90 | Bolt | 8 |
| 01***11 | Nut (Welded) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Rear Axle Housing
| 04***60 | Screw, Serial Number Plate | 4 |
| 07***34 | O-Ring,Transmission And Steering Case | 2 |
| 07***52 | Breather, Radiator Sub Tank | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Rear Axle Support(#1005-1018)
| 01***25 | Bolt - Rear Guard Mounting | 24 |
| 01***36 | Washer,Radio Controlled Slag Handling | 24 |
| 04***30 | Seal, Dust | 16 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Rear Axle Support(#1019-)
| 01***25 | Bolt,(For Rubber Shoe) | 24 |
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 24 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 24 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Rear Brake
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 12 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 18 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 18 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Wheel
| 56***90 | Core (Kit) | 2 |
| 56***91 | Core,Valve (Kit) | 2 |
| 56***80 | Packing (Kit) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Drive Shaft? Differential And Wheels : Wheel (For Large Size Tire)
| 28***41 | O-Ring | 1 |
| 28***81 | Ring,Lock | 1 |
| 56***90 | Core (Kit) | 2 |
Engine Related Parts And Electrical System
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Air Cleaner(#1005-1409)
| 01***20 | Bolt | 4 |
| 01***25 | Bolt | 4 |
| 01***08 | Nut,R.H. Thread | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Air Cleaner(#1410-2000)
| 60***80 | Clamp | 1 |
| 60***90 | Valve,Vacuator | 1 |
| 60***11 | Element,Inner (Kit) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Air Cleaner(#2001-)
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 60***80 | Clamp | 1 |
| 60***90 | Valve,Vacuator | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Air Intake System(#1005-1156)
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***45 | Bolt,(S6d155-4b) | 1 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 10 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Air Intake System(#1157-1409)
| 01***25 | Bolt,Without Revolution Sensor | 1 |
| 01***45 | Screw | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Air Intake System(#1410-)
| 01***25 | Bolt,Without Revolution Sensor | 1 |
| 01***45 | Screw | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Brake Oil Cooler
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 22 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 2 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 24 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Bypass Filter Piping And Mount(#1005-1409)
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
| 01***25 | Bolt - Rear Guard Mounting | 4 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Bypass Filter Piping And Mount(#1410-2000)
| 01***25 | Bolt,Without Revolution Sensor | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Bypass Filter Piping And Mount(#2001-)
| 01***25 | Bolt,Without Revolution Sensor | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Electrical System (1/2)(#1005-1409)
| 01***12 | Bolt,(Without R.P.C.U.) | 6 |
| 01***16 | Bolt (Welded) | 4 |
| 01***16 | Bolt,(For Slag Handling) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Electrical System (1/3)(#1410-2000)
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 6 |
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Electrical System (1/3)(#2001-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***30 | Screw | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Electrical System (2/2)(#1005-1409)
| 01***12 | Bolt,(Without R.P.C.U.) | 6 |
| 01***16 | Bolt (Welded) | 4 |
| 01***16 | Bolt,(For Slag Handling) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Electrical System (2/3)(#1410-2000)
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 6 |
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Electrical System (2/3)(#2001-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***55 | Bolt | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Electrical System (3/3)(#1410-2000)
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 6 |
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Electrical System (3/3)(#2001-)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 66 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Engine Mount(#1005-1409)
| 01***50 | Bolt | 2 |
| 01***50 | Bolt | 4 |
| 01***65 | Bolt | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Engine Mount(#1410-2000)
| 01***20 | Bolt | 4 |
| 01***40 | Bolt | 4 |
| 01***85 | Bolt | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Engine Mount(#2001-)
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Engine Output Shaft (1/2)(#1005-2000)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 24 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 11 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Engine Output Shaft (2/2)(#1005-2000)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 24 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 11 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Engine Output Shaft(#2001-)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***90 | Bolt, Fan Mounting | 12 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 11 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Engine? Torque Converter And Brake Cooling System(#1005-1156)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***25 | Bolt - Rear Guard Mounting | 22 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Engine? Torque Converter And Brake Cooling System(#1157-2000)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 22 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 12 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Engine? Torque Converter And Brake Cooling System(#2001-)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***00 | Bolt | 8 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 22 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Ether Spray(#1031-)
| 01***20 | Bolt,(Without Maintenance Monitor) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Exhaust System (1/2)(#1005-2000)
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 6 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Exhaust System (1/2)(#2001-)
| 01***45 | Screw | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Exhaust System (2/2)(#1005-2000)
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 6 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Exhaust System (2/2)(#2001-)
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***20 | Bolt | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Fuel Tank And Piping(#1005-2000)
| 01***12 | Bolt,(With Cylinder Cover) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 11 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Fuel Tank And Piping(#2001-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 13 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Instrument Panel(#1005-1409)
| 01***12 | Screw,(For Side Lamp) (Not Shown) | 3 |
| 01***16 | Screw,(Sandy And Dusty Terrain S.) | 2 |
| 01***12 | Screw,(With Articulate Indicator) | 3 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Instrument Panel(#1410-2000)
| 01***12 | Screw,(With Articulate Indicator) | 3 |
| 01***16 | Screw,(P.O.C. Model) (Except Japan) | 10 |
| 01***16 | Screw | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Instrument Panel(#2001-)
| 01***12 | Screw,(With Articulate Indicator) | 3 |
| 01***16 | Screw,(P.O.C. Model) (Except Japan) | 10 |
| 01***25 | Screw | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Lock Up Switch(#1157-)
| 08***00 | Connector (Modify Air Dryer Lead) | 1 |
| 08***01 | Connector - At Radio Power Source And Speaker | 1 |
| 56***00 | Switch Ass'Y,Lock-Up | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Radiator And Torque Converter Oil Cooler (1/2)(#1005-2000)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 22 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Radiator And Torque Converter Oil Cooler (2/2)(#1005-2000)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 22 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Radiator And Torque Converter Oil Cooler(#2001-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 10 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 96 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 9 |
Komatsu : Hd320-2(S/N 1005-Up) : Engine Related Parts And Electrical System : Radiator Curtain
| 01***20 | Washer,Spring | 16 |
| 40***30 | Snap,(With Nut) | 16 |
| 56***00 | Curtain Ass'Y | 1 |
Frame And Body
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Auxiliary Seat(#1005-1557)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***12 | Screw,(With Articulate Indicator) | 4 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Auxiliary Seat(#1558-)
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 4 |
| 01***32 | Washer,Spring | 4 |
| 56***01 | Seat Ass'Y | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Cab (1/2)(#1031-1156)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 15 |
| 01***12 | Screw | 4 |
| 01***16 | Screw,(For Auto-Emergency Steering) | 12 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Cab (1/2)(#1157-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 15 |
| 01***12 | Screw,(Except Japan) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Cab (2/2)(#1031-1156)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 15 |
| 01***12 | Screw | 4 |
| 01***16 | Screw,(For Auto-Emergency Steering) | 12 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Cab (2/2)(#1157-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 15 |
| 01***12 | Screw,(Except Japan) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Cab(#1005-1030)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 26 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Car Heater(#1005-1409)
| 01***16 | Bolt (With Air Heater & Conditioner) | 3 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Car Heater(#1410-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***16 | Screw,(P.O.C. Model) (Except Japan) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Car Radio(#1031-1483)
| 01***16 | Bolt,(For Slag Handling) | 1 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***16 | Screw,(For Alternator 50a) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Car Radio(#1484-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***16 | Screw,(P.O.C. Model) (Except Japan) | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Decal And Foot Rubber (Arabic)
| 01***08 | Screw, Terminal | 2 |
| 01***08 | Screw,(Except Japan) | 4 |
| 01***10 | Washer,Spring (For Engine Room Lamp) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Decal And Foot Rubber (Chinese)
| 01***08 | Screw, Terminal | 2 |
| 01***08 | Screw,(Except Japan) | 4 |
| 01***10 | Washer,Spring (For Engine Room Lamp) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Door? L.H.(#1005-1156)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***08 | Screw | 4 |
| 01***16 | Screw,(Not Used When Ventilator) | 17 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Door? L.H.(#1157-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***16 | Screw,(For Auto-Emergency Steering) | 2 |
| 01***16 | Screw,(For Alternator 50a) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Door? R.H.(#1005-1156)
| 01***25 | Bolt (M6-1.00x25) | 4 |
| 01***16 | Screw | 2 |
| 01***12 | Screw | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Door? R.H.(#1157-)
| 01***16 | Screw,(For Alternator 50a) | 4 |
| 01***10 | Screw | 4 |
| 01***12 | Screw | 3 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Main Frame
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
| 01***50 | Bolt,(For Tbg/Abe Spec.) | 18 |
| 01***48 | Washer,Spring | 18 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Operator'S Seat(#1005-1557)
| 01***40 | Bolt,(With Air Conditioner) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Operator'S Seat(#1558-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***40 | Bolt,(With Air Conditioner) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Seat Belt(#1410-1557)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
| 01***34 | Washer,Spring | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Sheet Cowling And Guard (1/2)(#1005-1156)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 10 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 31 |
| 01***30 | Bolt,(For France Noise Suppression) | 21 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Sheet Cowling And Guard (1/2)(#1157-2000)
| 01***20 | Bolt,(With Auto Emergency Steering) | 16 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 16 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Sheet Cowling And Guard (1/3)(#2001-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 12 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 13 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Sheet Cowling And Guard (2/2)(#1005-1156)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 10 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 31 |
| 01***30 | Bolt,(For France Noise Suppression) | 21 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Sheet Cowling And Guard (2/2)(#1157-2000)
| 01***20 | Bolt,(With Auto Emergency Steering) | 16 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 16 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Sheet Cowling And Guard (2/3)(#2001-)
| 01***12 | Bolt,(With Cylinder Cover) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 18 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 13 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Sheet Cowling And Guard (3/3)(#2001-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Frame And Body : Windshield Washer
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 2 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 2 |
| 47***40 | Sticker | 4 |
Hydraulic System
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Demand Valve
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 4 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 4 |
| 01***55 | Bolt,(Tree Pusher Dozer) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hoist Cylinder (1/2)(#1005-1409)
| 01***30 | Bolt,(Cold Terrain Spec.) | 12 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***30 | Bolt,(For Mechanical Governor) | 12 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hoist Cylinder (2/2)(#1005-1409)
| 01***30 | Bolt,(Cold Terrain Spec.) | 12 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***30 | Bolt,(For Mechanical Governor) | 12 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hoist Cylinder(#1410-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***05 | Bolt | 8 |
| 01***40 | Stud | 5 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hoist Valve (1/2)
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
| 01***75 | Bolt,(For D57sr) | 4 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hoist Valve (2/2)
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
| 01***75 | Bolt,(For D57sr) | 4 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Filter
| 01***50 | Bolt,(Without R.O.P.S.) | 10 |
| 01***50 | Bolt | 10 |
| 01***09 | Nut | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Demand Valve To Steering And Hoist Valve)(#2001-)
| 01***50 | Bolt,(With Service Valve R.H.) | 2 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 2 |
| 01***65 | Bolt,(Except Japan) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Pump To Demand Valve)(#2001-)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***50 | Bolt,(With Service Valve R.H.) | 2 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Rear Brake To Brake To Brake Oil Cooler)(#2001-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 4 |
| 01***85 | Bolt, Mount Tubes To Switch And Work Pumps | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Tank To Pump)(#2001-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 12 |
| 01***90 | Bolt,(Without Giant Ripper) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Tank To Valve) (1/2)(#1005-1006)
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
| 01***45 | Bolt,(For Suction? Reversible Fan) | 2 |
| 01***50 | Bolt | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Tank To Valve) (1/2)(#1007-2000)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Tank To Valve) (2/2)(#1005-1006)
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
| 01***45 | Bolt,(For Suction? Reversible Fan) | 2 |
| 01***50 | Bolt | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Tank To Valve) (2/2)(#1007-2000)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Valve To Hoist Cylinder)(#1005-1006)
| 01***60 | Bolt,(Without Alternator Bracket) | 8 |
| 01***45 | Bolt,(For Suction? Reversible Fan) | 2 |
| 01***60 | Bolt (M10-1.50x60) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Valve To Hoist Cylinder)(#1007-2000)
| 01***35 | Bolt,(For Position Fixing) | 4 |
| 01***45 | Screw | 4 |
| 01***60 | Bolt,(For Japan And Sweden) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Valve To Hoist Cylinder)(#2001-)
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Valve To Rear Brake Oil Cooler)(1/2)(#1005-2000)
| 01***65 | Bolt, Mount Side Weights | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 22 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 24 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Valve To Rear Brake Oil Cooler)(2/2)(#1005-2000)
| 01***65 | Bolt, Mount Side Weights | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 22 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 24 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Piping (Valve To Rear Brake)(#2001-)
| 01***65 | Bolt, Mount Side Weights | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 24 |
| 01***60 | Bolt, Tube To Oil Cooler | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Pump(#1005-2000)
| 04***20 | Ring, Snap | 1 |
| 07***62 | Seal,Oil | 1 |
| 07***02 | Hydraulic Pump Ass'Y,(Par090-102) | 3 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Hydraulic Pump(#2001-)
| 04***20 | Ring, Snap | 1 |
| 07***62 | Seal,Oil | 1 |
| 07***03 | Pump Ass'Y,(Pal090-103) | 3 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Main Tank
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Steering Cylinder(#1005-1006)
| 01***45 | Bolt, Mount Bracket | 4 |
| 01***50 | Bolt,(Shim Thickness?Less Than 8mm) | 2 |
| 01***45 | Bolt (Op) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Steering Piping(#1005-2000)
| 01***35 | Bolt,(For Position Fixing) | 10 |
| 01***45 | Screw | 10 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 10 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Steering Piping(#2001-)
| 01***35 | Bolt,(For Position Fixing) | 8 |
| 01***45 | Screw | 8 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Steering Valve
| 01***45 | Bolt | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***75 | Bolt,(For D57sr) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Sub Tank
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***40 | Bolt,(Not Used With Cab) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Tank Bracket (1/2)(#1005-2000)
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 4 |
| 01***30 | Bolt,(For Mechanical Governor) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Tank Bracket (2/2)(#1005-2000)
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 4 |
| 01***30 | Bolt,(For Mechanical Governor) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Hydraulic System : Tank Bracket(#2001-)
| 01***30 | Bolt,(For Mechanical Governor) | 8 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 4 |
| 01***40 | Bolt,(With Service Valve R.H.) | 4 |
Optional Parts
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Alchol Injector
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Auto Greaser
| 56***00 | Auto Greaser Ass'Y | 1 |
| 56***20 | Pump Ass'Y | 1 |
| 56***30 | Distributor Ass'Y | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Auto Lubricating System (1/6)(#2001-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***10 | Screw,(For Wiper Switch Earth) | 2 |
| 01***16 | Seat,(For Desiccant Type) (Welded) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Auto Lubricating System (2/6)(#2001-)
| 01***25 | Bolt,(For Automatic) | 4 |
| 01***09 | Seat (Welded) | 2 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Auto Lubricating System (3/6)(#2001-)
| 01***25 | Bolt,(For Automatic) | 3 |
| 01***40 | Bolt | 4 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 15 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Auto Lubricating System (4/6)(#2001-)
| 01***25 | Bolt,(For Automatic) | 3 |
| 01***40 | Bolt | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 12 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Auto Lubricating System (5/6)(#2001-)
| 01***25 | Bolt,(For Automatic) | 8 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 12 |
| 01***09 | Seat (Welded) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Auto Lubricating System (6/6)(#2001-)
| 01***25 | Bolt,(For Automatic) | 4 |
| 01***40 | Bolt | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 17 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Auto Lubricating System(#1410-2000)
| 01***25 | Bolt,(For Automatic) | 26 |
| 01***40 | Bolt | 10 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 50 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Car Cooler(#1005-2000)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***55 | Bolt | 4 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Car Cooler(#2001-)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***55 | Bolt | 4 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Car Stereo
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***12 | Screw,(For Side Lamp) (Not Shown) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Dump Buzzer(#1005-1156)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 3 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***12 | Screw | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Dump Buzzer(#1157-)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***12 | Bolt,(With Cylinder Cover) | 1 |
| 01***11 | Nut (Welded) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Dump Caution Lamp(#1157-)
| 01***20 | Bolt,(Without Maintenance Monitor) | 4 |
| 01***12 | Screw,(With Articulate Indicator) | 4 |
| 01***11 | Nut (Welded) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Dust Proof Modification(#1157-2000)
| 01***20 | Bolt,(Used When Towing Winch) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 5 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Dust Proof Modification(#2001-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 5 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Emergency Relay Valve
| 56***10 | Bolt, Cover To Body | 4 |
| 56***20 | Washer, Spring | 4 |
| 56***01 | Relay Valve Ass'Y,Emergency | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Engine Overrun Protection
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Engine Side Cover(#1157-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 4 |
| 01***05 | Nut,(For Air Conditioner Less), Nut | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Fan
| 01***16 | Screw,(Sandy And Dusty Terrain S.) | 2 |
| 01***16 | Screw (Op) | 6 |
| 01***10 | Washer,(For Am Radio) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Fog Lamp(#2001-)
| 08***20 | Switch,Work Lamp | 1 |
| 08***30 | Switch,Fog Lamp | 1 |
| 56***00 | Fog Lamp Ass'Y,Fog | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Front Brake Control(#1410-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***14 | Seat,(For Automatic) | 4 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Mat Guard
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 5 |
| 01***32 | Bolt | 10 |
| 01***10 | Nut,(Without Air Conditioner) | 5 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Muffler
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 4 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Upper) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : No Spin Differential
| 01***20 | Bolt | 8 |
| 56***60 | Plate (Kit) | 4 |
| 56***90 | Pin | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Pressure Regulator For Gas Servicing Tool(#1410-)
| 56***00 | Regulator Ass'Y,Pressure | 1 |
| 56***10 | Body | 1 |
| 56***20 | Cap | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Radiator Auto Shutter(#1410-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 12 |
| 07***16 | Tube | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Side Lamp(#1005-1156)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***16 | Seat,(For Desiccant Type) (Welded) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Side Lamp(#1157-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 5 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***16 | Seat,(For Desiccant Type) (Welded) | 7 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Speed Limit Alarm System
| 08***00 | Connector (Modify Air Dryer Lead) | 1 |
| 08***03 | Connector | 1 |
| 08***00 | Terminal | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Steering Link Lubricate
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***08 | Screw, Terminal | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Suspension Cylinder Gas Servicing And Adjusting Tool
| 07***32 | Fitting,Grease | 1 |
| 09***20 | Cap, Tire Valve | 1 |
| 56***80 | Nipple (Std) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Tire Chain
| 56***00 | Tire Chain Ass'Y | 2 |
| 56***01 | Tire Chain Ass'Y,(18.00-25-32pr) | 2 |
| 56***00 | Chain | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Under Mirror
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Vandalism Protection
| 07***00 | Cap,(For Vandalism) (Not Shown) (Op) | 1 |
| 07***00 | Cap, Locking - Hydraulic Tank Oil Filler Cap | 3 |
| 07***00 | Cap,(For Vandalism Protection) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Vessel Extention
| 56***01 | Extension Ass'Y | 1 |
| 56***02 | Extension Ass'Y | 1 |
| 56***03 | Extension Ass'Y | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Vessel Wear Plate
| 56***10 | Plate | 1 |
| 56***11 | Plate | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Water Temp. And Engine Oil Pressure Caution System(#2001-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
| 08***05 | Switch,Engine Oil Pressure | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Optional Parts : Yellow Rotating Lamp
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 4 |
Steering? Control And Air Systems
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Accelerator Pedal And Linkage(#1005-1156)
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***25 | Bolt - Rear Guard Mounting | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Accelerator Pedal And Linkage(#1157-)
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***00 | Bolt, Mount Back-Up Alarm | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Governor
| 38***-1 | Screw,Adjusting | 1 |
| 38***-1 | Seat,Spring | 2 |
| 38***-1 | Guide,Spring | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (1/3)(#1005-1006)
| 01***20 | Bolt | 3 |
| 01***16 | Bolt,(For Slag Handling) | 14 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 13 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (1/3)(#1097-2000)
| 01***16 | Bolt (With Air Heater & Conditioner) | 8 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 15 |
| 01***25 | Bolt,Without Revolution Sensor | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (1/4)(#1007-1096)
| 01***16 | Bolt,(For Slag Handling) | 10 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 11 |
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (1/4)(#2001-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 6 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (2/3)(#1005-1006)
| 01***20 | Bolt | 3 |
| 01***16 | Bolt,(For Slag Handling) | 14 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 13 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (2/3)(#1097-2000)
| 01***16 | Bolt (With Air Heater & Conditioner) | 8 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 15 |
| 01***25 | Bolt,Without Revolution Sensor | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (2/4)(#1007-1096)
| 01***16 | Bolt,(For Slag Handling) | 10 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 11 |
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (2/4)(#2001-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***50 | Bolt (Kit) | 2 |
| 01***70 | Bolt (Op) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (3/3)(#1005-1006)
| 01***20 | Bolt | 3 |
| 01***16 | Bolt,(For Slag Handling) | 14 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 13 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (3/3)(#1097-2000)
| 01***16 | Bolt (With Air Heater & Conditioner) | 8 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 15 |
| 01***25 | Bolt,Without Revolution Sensor | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (3/4)(#1007-1096)
| 01***16 | Bolt,(For Slag Handling) | 10 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 11 |
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (3/4)(#2001-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (4/4)(#1007-1096)
| 01***16 | Bolt,(For Slag Handling) | 10 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 11 |
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Air Piping (4/4)(#2001-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 19 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Auto Drain Valve
| 41***50 | Valve Ass'Y,Auto Drain (Kit) | 1 |
| 41***60 | Heater,24v/18w | 1 |
| 41***70 | Valve Kit,Auto Drain Valve | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic T/M Accelerator Pedal Detent And Throttle Sensor(#1410-)
| 01***65 | Bolt | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***00 | Bolt,(Without Cab) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic Transmission Actuator And Switch (1/2)(#1410-)
| 01***60 | Bolt | 2 |
| 01***65 | Bolt | 2 |
| 01***35 | Bolt,(For Position Fixing) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic Transmission Actuator And Switch (2/2)(#1410-)
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic Transmission Control Linkage(#1410-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 7 |
| 01***45 | Bolt | 1 |
| 01***45 | Capscrew - M10 X 1.25 | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic Transmission Electrical Wiring(#1410-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 3 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 3 |
| 08***15 | Wire,(Not Shown) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic Transmission Pneumatic System(#1410-)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic Transmission Shift Lever And Controller(#1410-2000)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***20 | Bolt,(Without Maintenance Monitor) | 4 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic Transmission Shift Lever And Controller(#2001-)
| 01***20 | Bolt,(Without Maintenance Monitor) | 6 |
| 01***25 | Bolt,(For Automatic) | 1 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic Transmission Speed Sensor(#1410-)
| 01***10 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Automatic Transmission Throttle Sensor(#1410-)
| 01***25 | Bolt,(For Automatic) | 1 |
| 01***10 | Screw, Mount Wire Assembly | 4 |
| 01***12 | Screw,(For Side Lamp) (Not Shown) | 5 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Check Valve
| 28***10 | Valve Ass'Y,Check (Kit) | 3 |
| 28***30 | Body | 1 |
| 28***40 | Seat (Kit) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Dump Lever And Linkage(#1005-2000)
| 01***16 | Bolt | 1 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***35 | Bolt,(For Position Fixing) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Dump Lever And Linkage(#2001-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 3 |
| 01***35 | Bolt,(For Position Fixing) | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Emergency Brake(#1410-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***16 | Seat,(For Desiccant Type) (Welded) | 2 |
| 01***09 | Nut,(With Body Positioner) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Emergency Steering (1/3) (1)(#1410-)
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 4 |
| 01***11 | Nut,(With Under Mirror) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Emergency Steering (1/3) (2)(#1410-)
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 4 |
| 01***11 | Nut,(With Under Mirror) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Emergency Steering (2/3)(#1410-)
| 01***40 | Bolt,(With Air Conditioner) | 4 |
| 01***70 | Bolt, Mount Bracket And Oil Inlet Tube, Bolt | 4 |
| 01***11 | Nut,(With Under Mirror) | 6 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Emergency Steering (3/3)(#1410-)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Front Brake Chamber
| 28***11 | Diaphragm | 1 |
| 28***12 | Diaphragm (Kit) | 1 |
| 56***01 | Brake Chamber Ass'Y | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Hand Brake Valve
| 56***10 | Valve Ass'Y,Inlet Exhaust (Kit) | 1 |
| 56***11 | Valve Ass'Y,Inlet Exhaust (Kit) | 1 |
| 56***20 | Cam Ass'Y (Kit) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Parking Brake Valve
| 56***50 | Valve Ass'Y,Parking Brake (Kit) | 1 |
| 56***10 | Body | 1 |
| 56***20 | Spring (Kit) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Rear Brake Chamber(#1005-1058)
| 28***12 | Diaphragm (Kit) | 1 |
| 56***05 | Brake Chamber Ass'Y,Rear | 2 |
| 56***40 | Nut | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Rear Brake Chamber(#1059-)
| 28***12 | Diaphragm (Kit) | 1 |
| 56***05 | Brake Chamber Ass'Y,Rear | 2 |
| 56***06 | Brake Chamber Ass'Y | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Relay Valve
| 56***60 | Valve (Kit) | 1 |
| 56***70 | Ring,Retaining (Kit) | 1 |
| 56***80 | O-Ring (Kit) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Steering Follow-Up Linkage (1/2)
| 01***30 | Bolt | 8 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Steering Follow-Up Linkage (2/2)
| 01***30 | Bolt | 8 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Steering Linkage (1/2)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 26 |
| 01***55 | Bolt, Mount Lh Bracket | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Steering Linkage (2/2)
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Steering Wheel And Gear(#1005-1483)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***22 | Nut | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Steering Wheel And Gear(#1484-2000)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 4 |
| 01***22 | Nut | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Steering Wheel And Gear(#2001-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Transmission Actuator (1/3)(#1005-1156)
| 01***60 | Bolt | 2 |
| 01***65 | Bolt | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Transmission Actuator (2/3)(#1005-1156)
| 01***60 | Bolt | 2 |
| 01***65 | Bolt | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Transmission Actuator (3/3)(#1005-1156)
| 01***60 | Bolt | 2 |
| 01***65 | Bolt | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Transmission Control Linkage(#1007-1156)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 7 |
| 01***25 | Bolt - Rear Guard Mounting | 4 |
| 01***45 | Bolt | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Transmission Shift Lever (1/2)(#1157-2000)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***25 | Bolt,Without Revolution Sensor | 4 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Transmission Shift Lever (1/2)(#2001-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***35 | Bolt,(For Position Fixing) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Transmission Shift Lever (2/2)(#1157-2000)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***25 | Bolt,Without Revolution Sensor | 4 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Transmission Shift Lever (2/2)(#2001-)
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***45 | Bolt | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Transmission Shift Lever And Control Box(#1005-1156)
| 01***10 | Bolt | 4 |
| 01***16 | Bolt,(For Slag Handling) | 1 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Steering? Control And Air Systems : Treadle And Brake Valve
| 01***22 | Bolt,(10m) | 4 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 4 |
| 38***-1 | Spring,Rubber | 1 |
Tool And Kit
Komatsu : Hd320-2(S/N 1005-Up) : Tool And Kit : Service Kit
| 01***90 | Bolt | 4 |
| 01***11 | Nut (Welded) | 4 |
| 01***23 | Washer | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Tool And Kit : Tool(#1005-2000)
| 07***00 | Pump,Grease | 1 |
| 07***00 | Pump,Grease | 1 |
| 07***00 | Cartridge,Grease | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Tool And Kit : Tool(#2001-)
| 07***00 | Pump,Grease | 1 |
| 07***00 | Cartridge,Grease | 1 |
| 07***00 | Nozzle, Grease Pump (Flexible Type) | 1 |
Torque Convertor And Transmission
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Power Take Off Gear(#2001-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 14 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 4 |
| 01***25 | Capscrew | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torqflow(#1005-2000)
| 07***12 | O-Ring (Itl) | 4 |
| 56***00 | Torque Convertor A.,(Tcs43-2a) | 1 |
| 56***01 | Torque Convertor A.,(Tcs43-2c) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torqflow(#2001-)
| 01***50 | Bolt,(For Strengthened Cover) | 14 |
| 01***60 | Bolt, Tube To Oil Cooler | 3 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 17 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter And Transmission Piping (2/2)(#2001-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***50 | Bolt,(With Service Valve R.H.) | 4 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter And Transmission Piping(#1005-1006)
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***45 | Bolt,(For Suction? Reversible Fan) | 4 |
| 01***60 | Bolt (M10-1.50x60) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter And Transmission Piping(#1007-2000)
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 4 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter And Transmission Piping(#2001-)
| 01***30 | Bolt,(For Center Guard) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter Housing(#1005-1409)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 10 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 14 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter Housing(#1410-2000)
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter Housing(#2001-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 7 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter Pump? Turbine? Stator And Lock Up Clutch(#1005-1409)
| 01***25 | Bolt,(Without Auto Priming System) | 32 |
| 01***30 | Bolt,(For France Noise Suppression) | 12 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 6 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter Pump? Turbine? Stator And Lock Up Clutch(#1410-2000)
| 01***40 | Bolt,(Dust And Dirt Protection) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter Pump? Turbine? Stator And Lock Up Clutch(#2001-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 18 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***30 | Bolt, Mount Pump | 60 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter Valve And Solenoid Valve(#1005-2000)
| 01***90 | Bolt (M10-1.50x90) | 9 |
| 01***06 | Screw | 4 |
| 01***07 | Washer,(For Slag Handling) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Torque Converter Valve And Solenoid Valve(#2001-)
| 01***90 | Bolt, Fan Mounting | 9 |
| 01***45 | Bolt | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 9 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Transmission Case And Lub Valve (1/2)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 6 |
| 01***50 | Bolt | 6 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Transmission Case And Lub Valve (2/2)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 6 |
| 01***50 | Bolt | 6 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Transmission Gear? Shaft And Clutch (1/2)
| 01***14 | Bolt | 8 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 18 |
| 01***25 | Bolt - Rear Guard Mounting | 16 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Transmission Gear? Shaft And Clutch (2/2)
| 01***14 | Bolt | 8 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 18 |
| 01***25 | Bolt - Rear Guard Mounting | 16 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Transmission Mount
| 01***70 | Bolt,(With Wear Guard) | 8 |
| 01***80 | Bolt | 8 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 8 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Transmission Valve (1/2)
| 01***35 | Bolt,(Without Auto Priming System) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
Komatsu : Hd320-2(S/N 1005-Up) : Torque Convertor And Transmission : Transmission Valve (2/2)
| 01***35 | Bolt,(Without Auto Priming System) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
Vessel
Komatsu : Hd320-2(S/N 1005-Up) : Vessel : Vessel Positioner
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***70 | Bolt | 1 |
| 01***10 | Nut,(Without Air Conditioner) | 1 |
Komatsu : Hd320-2(S/N 1005-Up) : Vessel : Vessel(#1005-1120)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 20 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***25 | Bolt,(For Slag Handling) | 4 |
Komatsu : Hd320-2(S/N 1005-Up) : Vessel : Vessel(#1121-)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 10 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 18 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 4 |
HD320-2(S/N 1005-UP) serial number reference
The machine serial number (PIN) plate on this-era Komatsu HD-series rigid dump trucks (HD320-2, HD325, HD405, HD785) is mounted on the left front end of the main frame. The plate reads the model code (HD320-2) followed by the machine serial number; there is no separate 3-letter prefix block to decode on this series - the serial number itself (1005 and up) ties a unit to this parts/service range.
| Prefix | Identifies | Notes |
|---|---|---|
| (none) | HD320-2, S/N 1005-UP | No 3-character PIN prefix scheme documented for this rigid dump truck. Komatsu identifies this model by model code plus a single continuous machine serial-number run starting at 1005, not by a letter-prefix code as used on excavators and wheel loaders. Serial 1005-UP covers the HD320-2 generation; the follow-on HD320-3 generation starts a separate run at 2501-UP and uses a different engine tune - confirm with dealer if a plate number falls near that boundary. |
Frequently asked questions
What engine powers the Komatsu HD320-2 (S/N 1005-UP)?
It uses a Cummins NTA855-family mechanical, turbocharged inline-six diesel with no electronic engine controls, paired with an automatic torque-converter powershift transmission.
What is the operating weight of the Komatsu HD320-2 (S/N 1005-UP)?
Loaded operating weight falls in the upper-50-tonne class with a rated payload in the high-20-tonne range; exact figures vary by configuration and aren't separately published for this serial range, so confirm against the nameplate.
What replaced the Komatsu HD320-2 (S/N 1005-UP)?
It was succeeded in 1984 by the Komatsu HD320-3 (S/N 2501-UP), which kept the same Cummins NTA855 engine family but added chassis and hydraulic updates.
What HD320-2(S/N 1005-UP) owners discuss
How does the HD320-2 drive, and what do operators say about the powertrain feel?
This is a straight mechanical-drive rigid hauler: a torque converter feeds a power-shift transmission and a live rear axle, no electronic transmission control and no wheel motors. Shift feel is firm rather than smooth, normal for a truck of this vintage. A recurring complaint on this fuel system is idle hunting and throttle surge after long idle periods, plus rough running or a flat spot under load that traces back to air getting into the fuel supply through old, cracked supply or return lines rather than the pump itself. Chase air-in-fuel before condemning the fuel pump. Have your dealer verify fuel line and connection integrity if the engine hunts at idle or falls flat under load.
What is the biggest engine quirk to watch for on this generation of Cummins-powered Komatsu hauler?
The engine is a mechanically governed, wet-sleeve inline-six from Cummins' 855 family (NTA-855-1A), and its signature weak point is cylinder liner pitting from coolant cavitation. Vibration from the wet liners forms tiny vapor bubbles in the coolant jacket; when they collapse against the liner wall they erode small pits, and once a pit breaks through, coolant enters the cylinder. This is driven almost entirely by neglected coolant additive maintenance, not by hard use. Test and replenish supplemental coolant additive on the interval in the truck's fluid chart rather than just topping off coolant level. Rising coolant temp, unexplained coolant loss, or a milky dipstick on this engine points straight at liner pitting. Have your dealer verify coolant additive levels and pressure-test the cooling system before it gets that far.
Are there other known weak points on the NTA855-C used in this truck?
Yes. Injector tips clog over time and show up as misfiring plus white or black smoke depending on which cylinder is affected, and injector cup or O-ring sealing failures let fuel or compression leak past the injector tube into the water jacket. Head gasket leaks are also a known failure mode on high-hour examples of this engine family; once a head gasket lets go, the head has to come off for inspection and the deck surface needs to be checked for trueness before reassembly. None of this is unique to this exact serial range, it is standard 855-family behavior. Have your dealer verify injector sealing and head gasket condition on any truck showing coolant/oil cross-contamination or persistent smoke.
What wear patterns show up on the frame, suspension, and tires on trucks this size?
Being a rigid-frame hauler rather than a tracked machine, the areas to watch are the front suspension struts, rear suspension mounts, and the frame rails around the hoist pivot and rear axle housing. Frames in this class commonly develop hairline cracking at the hoist-mount stress points after years of loaded cycling — a routine inspection item on a high-hour truck, not necessarily a sign of abuse. Uneven tire wear side to side usually traces back to front-end alignment or a strut that has lost nitrogen charge rather than the tire itself. Have your dealer verify frame welds at the hoist pivot and check strut charge on any truck with visible cracking or lopsided tire wear.
What about the brakes and retarder — anything to know before working on them?
Trucks in this class use oil-cooled multiple-disc brakes at all four wheels rather than air or drum brakes, and the same discs double as the retarder on downgrades. The wet-disc design is low-maintenance day to day, but it lives or dies on brake cooling oil condition and flow — contaminated or low cooling oil is what actually burns the discs, not disc wear by itself. A climbing brake oil temperature on a long descent is the early warning sign, not a burning smell or noise. Have your dealer verify brake cooling oil condition and disc wear before returning a truck to grade work, since this is a safety-critical system.
This truck predates modern electronic engine and transmission controls — what electrical issues actually come up?
There is no ECM and no fault-code system on this generation, so a "sensor problem" almost always turns out to be something simpler: a corroded ground, wiring insulation cracked from heat soak near the engine bay, or a gauge sender (oil pressure, coolant temp) that reads wrong before it fails outright. Because nothing self-reports a code, a drifting gauge reading gets ignored longer than it should on these older trucks. Confirm any suspect gauge reading against a mechanical test gauge before chasing the sender or wiring. Have your dealer verify grounds and sender accuracy rather than replacing gauges on a guess.
What should I check before buying a used HD320-2(S/N 1005-UP)?
Confirm the serial number falls in this truck's actual production range before assuming parts and manuals apply — this platform was superseded by a later generation with a different engine, and parts do not fully interchange across that boundary. Pull the coolant additive history if available, or at minimum test the coolant now, given how much this engine's longevity depends on liner protection. Check for coolant-in-oil or oil-in-coolant contamination, inspect the frame at the hoist pivot and rear axle mounts for cracking, and check tire wear pattern for alignment or strut issues. Run the engine under load and watch for idle hunting or a flat spot that suggests air-in-fuel from aged fuel lines. Check brake cooling oil condition and look for discoloration that suggests past overheating. Given the age of any surviving example, have your dealer run a full pre-purchase inspection covering the engine, torque converter, brakes, and frame before you commit.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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