Komatsuhydraulic excavatorsmall ( - pc90)
Komatsu PW75-1(S/N 0000001-Up)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu PW75-1 (S/N 0000001-Up) is a compact wheeled hydraulic excavator, riding on tires instead of tracks, built from 1998 to 1999. It runs Komatsu's own 4D98E diesel, a naturally aspirated 4-cylinder engine built on the Yanmar 4TNE98 architecture, rated 51 kW (68.4 hp) at 2300 rpm from 3.32 L displacement, mechanically governed with no electronic engine controls. Operating weight sits around 7,500 kg (16,535 lb) in standard trim, with some configurations (blade, counterweight, full cab) running heavier, up to roughly 8,050 kg depending on spec. Bucket capacity spans 0.15-0.3 m3 (0.2-0.4 cu yd), the fuel tank holds 100.3 L (26.5 US gal), and the hydraulic system carries 70 L (18.5 US gal) total. It sat at the entry point of Komatsu's small-class wheeled excavator line at the time, typically specified with a mono-boom or two-piece offset boom, canopy or enclosed cab, and a rear dozer/stabilizer blade.
Komatsu replaced the PW75-1 directly with the PW75-2 around 1999-2001, carrying over the same 4D98E engine and weight class while adding a larger bucket option, before the size class moved to the separate PW75R-2 generation with its own wider operating-weight window and updated hydraulics. As a short, single-generation production run with no internal serial-prefix split, the PW75-1 today is a low-acquisition-cost machine valued for simple, non-electronic diagnostics and pre-ECM reliability rather than for performance. Parts support rides mainly on the widely used 4D98E/4TNE98 engine family shared across several Komatsu compact excavators of the era, so engine and hydraulic wear parts stay reasonably easy to source. Wheeled-driveline components such as axles, king pins, and wheel hubs, along with cab trim, are the pieces most likely to be scarce this far past production.
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 PW75-1(S/N 0000001-Up) specifications
Engine
| Engine model | Komatsu 4D98E, 4-cylinder water-cooled diesel |
| Gross power | 51 kW / 68.4 hp @ 2300 rpm |
| Net power | not separately published for this model in available sources |
| Displacement | 3.32 L (3,318 cc / 202.5 cu in) |
| Cylinders | 4, inline |
| Emissions tier | not documented for this serial range; a 1998-1999 production-run machine, ahead of later nonroad emissions tier labeling |
Weights
| Operating weight (standard) | 7,500 kg (16,535 lb) |
| Ground pressure | not published — this is a tire-mounted (wheel) excavator, so ground pressure is not a standard rated spec the way it is for tracked machines |
| Transport weight | not separately documented from operating weight in available sources |
Dimensions
| Overall/shipping length | 5.9 m (19.3 ft) |
| Overall width | 2.23 m (7.3 ft) |
| Overall height to cab top | 2.94 m (9.65 ft) |
| Shipping height (transport) | 3.96 m (13 ft) |
| Tail swing radius | 1.49 m (4.89 ft) |
| Wheelbase | 2.06 m (6.76 ft) |
| Ground clearance | 0.40 m (1.32 ft) |
| Tire width | not documented in available sources |
Performance
| Max digging depth | 3.32 m (10.88 ft) |
| Max reach at ground level | 6.31 m (20.71 ft) |
| Max dump/loading height | 4.76 m (15.62 ft) |
| Max cutting height | 6.37 m (20.9 ft) |
| Max vertical wall dig depth | 2.18 m (7.16 ft) |
| Swing speed | 10.2 rpm |
| Max travel speed | 30.1 kph (18.7 mph) |
| Hydraulic pump flow | 227 L/min (60 gpm) |
| Gradeability | not documented in available sources |
| Drawbar pull | not documented in available sources |
Forces
| Bucket digging force | not documented in available sources for this exact model/serial range |
| Arm/stick digging force | not documented in available sources for this exact model/serial range |
Service capacities (summary)
| Fuel tank | 100.3 L (26.5 gal) |
| Hydraulic system | 70.0 L (18.5 gal) |
| Engine oil | not documented in available sources |
| Cooling system | not documented in available sources |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
PW75-1(S/N 0000001-Up) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not documented for this exact serial range (PW75-1, S/N 0000001-Up) in the sources checked — verify against the dipstick marks or dealer OMM. | Komatsu genuine engine oil (EO), diesel-rated SAE 10W-30 or 15W-40 depending on ambient temperature, per the factory viscosity chart for the 4D98E engine. |
| Cooling system | Not documented for this exact serial range in the sources checked — verify against the dealer OMM. | Komatsu genuine antifreeze coolant (AF-NAC type), mixed with water at the ratio specified for the expected minimum ambient temperature; year-round corrosion-resistant coolant. |
| Fuel tank | 100.3 L (26.5 US gal) | ASTM D975 No. 2-D diesel fuel; switch to No. 1-D or a winter-blend diesel in cold climates below 0°C (32°F) to prevent fuel waxing. |
| Hydraulic system total (incl. hydraulic tank) | 70.0 L (18.5 US gal) system total — tank-only volume as a separate figure is not documented in the sources checked. | Komatsu genuine hydraulic oil (HO), ISO VG46 anti-wear type as standard fill; a lower-viscosity cold-climate hydraulic oil is called for where winter ambient temperatures run below 0°C (32°F). |
| Final drive (each) | Not documented for this exact serial range in the sources checked — verify against the dealer OMM. | Komatsu genuine powertrain/gear oil (TO), SAE 30 or SAE 10W depending on ambient temperature, gear-oil grade equivalent to API CD. |
| Swing drive | Not documented for this exact serial range in the sources checked — verify against the dealer OMM. | Komatsu genuine powertrain oil (TO), same SAE 30 / SAE 10W temperature-graded spec used for the final drives. |
| Pilot/other circuits | Not separately listed — pilot and control circuits draw from the main hydraulic tank/system. | Same Komatsu genuine hydraulic oil (HO) ISO VG46 used for the main hydraulic system. |
| Grease (spec only) | n/a — lubricated per the periodic grease-point schedule, no reservoir capacity. | Komatsu genuine multipurpose lithium-base grease (G2-LI grade) for pins, bushings, and the swing circle/bearing. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu PW75-1(S/N 0000001-Up) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
| Every 6,000 h |
|
Servicing the PW75-1(S/N 0000001-Up) beyond the schedule
Predictive Maintenance & Fluid Analysis
The PW75-1 predates onboard diagnostics: its mechanically governed 4D98E only reports trouble through analog gauges and warning lamps for oil pressure, charge, and coolant temperature. Predictive care means physical sampling. Pull hydraulic fluid from the 70 L system to track wear metals against the 5,910 psi relief setting, sample front and rear axle differential oil for water or metal contamination from wheeled-driveline stress, and monitor fuel filters closely since aging fuel systems on this platform silt up faster than the warning lamps will show.
Corrective & Common Repairs
Typical PW75-1 repairs center on age and the wheeled driveline. Expect king pin bushings, wheel bearings, and propeller-shaft U-joints to wear from steering and road-travel loads that tracked machines never see. Hydraulic cylinder seals and swing-circuit hoses leak as rubber ages past two decades in service. The preheat (glow) system and starter often need attention for cold starts on the mechanically governed 4D98E, and injection pump or nozzle recalibration restores lost power once gauges show high exhaust temperature or rough idle.
Overhaul & Rebuild Points
Major rebuild points on the PW75-1 are the swing reduction gear and bearing, the front and rear axle differentials with wheel reduction hubs, and the main hydraulic pump feeding the roughly 227 L/min (60 US gpm) circuit. Engine overhaul on the naturally aspirated 4D98E typically covers piston rings, cylinder liners, and injection pump or nozzle recalibration once compression and fuel delivery fall off. Because this is a short, single-generation run, source rebuild kits through the shared 4D98E/4TNE98 engine parts network rather than PW75-1-specific stock.
Seasonal & Environment Servicing
Cold-climate readiness on the PW75-1 leans on the preheat system and battery condition, since the mechanically governed 4D98E has no electronic cold-start assist; check glow plug function and coolant antifreeze concentration before winter. In hot or dusty conditions, watch the air cleaner service indicator and clean radiator and oil cooler fins more often than the standard interval. Because it rides on tires and exposed axles rather than tracks, wash road salt and mud from king pins, brakes, and propeller-shaft U-joints to stop corrosion and premature wear.
PW75-1(S/N 0000001-Up) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| YM102103-55520 | O-Ring,(For Fuel Filter) | Fuel system service | Check fitment → |
| YM129470-55610 | Body, Fuel Filter | Fuel system service | Check fitment → |
| 21D-60-11170 | Oil Filter, Assembly | Lubrication service | Check fitment → |
| YM121850-55710 | Element | Scheduled service item | Check fitment → |
| YM119000-55600 | Filter Element | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
PW75-1(S/N 0000001-Up) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Engine Oil Pressure Caution Lamp | Engine oil pressure has dropped below the safe minimum. | Low oil level, clogged oil filter, worn oil pump, or a failed pressure sender. | Stop the engine immediately, check oil level and filter condition before restarting. |
| Charge Caution Lamp | Alternator is not charging the battery. | Broken or slipping fan/alternator belt, failed alternator, or a loose wiring connection. | Check belt tension and alternator wiring, then test alternator output. |
| Battery Electrolyte Level Caution Lamp | Battery electrolyte has dropped below the minimum level line. | Normal evaporation, overcharging from a faulty regulator, or a cracked battery case. | Check electrolyte level and top up with distilled water; inspect the charging system if loss is rapid. |
| Electric System Caution Lamp | General fault in the machine's electrical circuit. | Blown fuse, loose ground connection, or a short/open circuit in the wiring harness. | Check the fuse box and battery terminals, then trace the wiring harness for damage. |
| Preheat (Glow Plug) Pilot Lamp | Indicates the glow plug preheat cycle for cold starting is active. | Normal cold-start function rather than a fault; stays lit longer in cold weather. | Wait for the lamp to go out before cranking; if it never lights, check the preheat relay and glow plug circuit. |
| Coolant Temperature Caution Lamp | Engine coolant temperature has exceeded the normal operating range. | Low coolant level, clogged radiator fins, failed thermostat, or a slipping fan belt. | Idle the engine, let it cool, then check coolant level and radiator for blockage. |
| Air Cleaner Restriction Indicator | Intake air filter element is clogged, restricting airflow to the engine. | Dust and debris buildup in the air filter element. | Inspect and clean or replace the air filter element. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
PW75-1(S/N 0000001-Up) attachments & work tools
Buckets
Standard GP bucket capacity is about 0.24 m3 (0.31 cu yd); the class working range runs roughly 0.15-0.3 m3 (0.2-0.4 cu yd), covering narrow trenching profiles up to wide general-purpose buckets. HD and rock buckets sit toward the low-capacity end of that range with heavier wear packages built on the same pin geometry. Bucket pin diameter isn't published for this exact serial range - same-size Komatsu carriers in this digging-equipment class are reported anywhere from 50-55mm (varies by configuration/series), so confirm with a takeout before ordering a pin-on bucket. Pin-on is the factory-default mount; a pin-grabber coupler is the common field upgrade for this weight class.
Hydraulic hammers
Breakers built for this carrier's weight bracket (roughly 6-9t, sometimes rated 4.5-8t by the attachment maker) typically fall in a 500-750 kg breaker class delivering roughly 700 to 1,100 joules of impact energy, running a 65-75mm moil-point or blunt-point tool. This lines up with the same mounting bracket and pin spacing used across the wider Komatsu size range that the PW75-1's digging end belongs to.
Quick couplers
Pin-grabber style couplers are the dominant type at this weight class. Mechanical (manually pinned) couplers are the lower-cost, lower-maintenance option and require the operator to leave the cab to lock and unlock; hydraulic pin-grabbers cost more but let the operator swap buckets, breakers, and grapples from the seat. Wedge-style couplers are less common at this size.
Thumbs/grapples
Bolt-on hydraulic thumb kits sized for machines in the 4.5-8t bracket are cataloged for this size class and pin to the stick using the same bucket-linkage geometry. Selector/sorting grapples rated for the same bracket are also available and run off the machine's auxiliary hydraulic line.
Rippers
No multi-shank ripper bar is offered at this weight class. The practical option is a single-tooth ripper/frost tooth that pins into the bucket linkage in place of the bucket, used for frost, rock, and root work beyond bucket duty; these teeth are typically sized broadly enough to cover machines well past this weight class.
Hydraulic-kit notes
As built, this machine carries a single (2-line) auxiliary hydraulic circuit suited to one-way tools like a hammer. Continuous-rotation attachments (rotating grapples, selector grabs with a rotate function) need an added diverter/solenoid valve kit, since the base circuit isn't wired for continuous rotation. Factory pump flow sits in the roughly 220-230 L/min (about 60 US gpm) combined range, sized for OEM buckets and single-function hammer work - there is no factory high-flow circuit for mulchers or flow-hungry cutters at this size.
All PW75-1(S/N 0000001-Up) assemblies by section
Every catalogued assembly group for the Komatsu PW75-1(S/N 0000001-Up). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Control System And Revolving Frame
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Fuel Control Lever
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Hydraulic Piping (2nd Boom Ppc Valve Line)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Hydraulic Piping (Arm And Swing Ppc Valve Line) (1/2)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***16 | Bolt,(Without Cab) | 4 |
| 21***80 | Union | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Hydraulic Piping (Arm And Swing Ppc Valve Line) (2/2)
| 21***60 | Union | 4 |
| 21***10 | Union | 4 |
| 21***60 | O-Ring | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Hydraulic Piping (Blade Ppc Valve Line)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 21***30 | Nut | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Hydraulic Piping (Boom And Bucket Ppc Valve Line) (1/2)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***16 | Bolt,(Without Cab) | 4 |
| 21***80 | Union | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Hydraulic Piping (Boom And Bucket Ppc Valve Line) (2/2)
| 21***60 | Union | 4 |
| 21***10 | Union Tee | 1 |
| 21***10 | Union | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Hydraulic Piping (Boom Swing Ppc Valve Line)
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Hydraulic Piping (Travel Ppc Valve Line)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***50 | Screw | 4 |
| 01***25 | Bolt, Seal Cover Mounting | 5 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Outrigger Control Lever (1/2)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 21***30 | Nut | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Outrigger Control Lever (2/2)
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Revolving Frame
| 01***60 | Bolt, Mount Pole | 4 |
| 22***10 | Counter Weight | 1 |
| 22***20 | Washer | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Servocontrol System Starting Lever
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 21***30 | Switch | 1 |
| 21***20 | Nut | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Control System And Revolving Frame : Steering Wheel And Column
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Engine
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Air Intake Manifold
| YM***00 | Manifold,Air Intake | 1 |
| YM***21 | Gasket (Kit) | 1 |
| YM***52 | Screw | 9 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Camshaft And Driving Gear
| YM***00 | Idle Gear Ass'Y | 1 |
| YM***00 | Tappet Rod | 8 |
| YM***50 | Bearing, Thrust | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Cooling Water System
| 21***60 | Water Temperature Transmitter (Instrument) | 1 |
| YM***40 | Fan, Cooling | 1 |
| YM***90 | Valve,Water Drain | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Crankshaft And Piston
| YM***50 | Ring Set (+0.25 mm) | 4 |
| YM***00 | Crankshaft, Assembly | 1 |
| YM***80 | Flywheel, Assembly | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Cylinder Block
| YM***60 | Cylinder Block, Assembly | 1 |
| YM***00 | Screw | 18 |
| YM***00 | Main Metal Ass'Y (Std) | 5 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Cylinder Head
| 22***00 | Engine, Assembly | 1 |
| YM***80 | Retainer, Spring | 8 |
| YM***40 | Seal,Valve? Exhaust (Kit) | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Engine Stop Device
| YM***00 | Pin, Cotter | 2 |
| YM***20 | Link | 1 |
| YM***00 | Coil | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Exhaust Manifold
| YM***02 | Bolt Plated | 2 |
| YM***00 | Muffler | 1 |
| YM***02 | Nut | 6 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Feed Pump
| YM***40 | Gasket | 4 |
| YM***60 | O-Ring | 2 |
| YM***00 | Screw | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Flywheel - Lubricating Oil Sump
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Fuel Injection Line
| YM***02 | Bolt Plated | 1 |
| YM***50 | Nozzle | 4 |
| YM***40 | Injection Pipe N. 4 | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Fuel Injection Pump
| YM***00 | Segment | 4 |
| YM***00 | Gasket Disc | 4 |
| YM***20 | Valve,Delivery | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Fuel Line
| YM***02 | Screw | 1 |
| YM***90 | Pipe L=500 | 2 |
| YM***10 | Banjo Fitting | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Gasket Set
| YM***40 | Seal,Valve? Exhaust (Kit) | 4 |
| YM***01 | Gasket (Kit) | 2 |
| YM***70 | O-Ring (Kit) | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Gear Housing
| YM***02 | Bolt Plated | 3 |
| YM***02 | Screw | 10 |
| YM***02 | Screw | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Generator
| YM***41 | Cover, Rear | 1 |
| YM***50 | Cable | 1 |
| YM***80 | Pulley | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Governor
| YM***40 | Screw | 2 |
| YM***00 | Nut | 1 |
| YM***00 | Screw | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Lubricating Oil Pump
| YM***40 | Stud | 1 |
| YM***81 | Retainer | 1 |
| YM***50 | Oil Pressure Transmitter | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine : Starter Motor
| YM***80 | Holder Brush, Assembly | 1 |
| YM***10 | Retainer | 1 |
| YM***20 | Shift Lever Ass'Y | 1 |
Engine Related Parts And Electrical System
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : 2ws Electrical System (Undercarriage Line)
| 21***40 | Hose-Clamp | 10 |
| 22***40 | Wiring Harness Undercarriage Line | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : 4ws Electrical System (Undercarriage Line)
| 21***40 | Hose-Clamp | 15 |
| 22***90 | Wiring Harness Undercarriage Line | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Air Cleaner And Mounting
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 10 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Battery
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 3 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Electrical System (Column And Service Line)
| 01***14 | Bolt | 2 |
| 01***20 | Bolt,(Without Maintenance Monitor) | 2 |
| 01***23 | Washer,(With Auto Emergency Steering) | 3 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Electrical System (Engine And Rear Light Line)
| 01***30 | Bolt | 2 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Electrical System (Fuse And Line)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 3 |
| 01***30 | Bolt | 1 |
| 01***02 | Nut (1) | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Electrical System (Light And Service Line) (1/2)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
| 21***60 | Hose-Clamp | 10 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Electrical System (Light And Service Line) (2/2)
| 01***30 | Screw | 4 |
| 01***04 | Nut,(For Air Conditioner Less) | 4 |
| 01***08 | Washer,(For Fixed Type Ripper) | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Engine Mounting Part
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 16 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 16 |
| 01***00 | Bolt - Cover Mounting | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Fuel Piping (1/2)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 6 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Fuel Piping (2/2)
| 01***70 | Bolt (Op) | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
| 21***80 | Cock | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Left Dashboard (2ws)
| 21***30 | Horn | 1 |
| 21***10 | Bulb | 2 |
| 21***80 | Plug | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Left Dashboard (2ws) (With Double Lower Equipment)
| 21***30 | Horn | 1 |
| 21***10 | Bulb | 2 |
| 21***80 | Plug | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Left Dashboard (4ws)
| 21***70 | Switch, Wheel Alignment | 1 |
| 21***90 | Warning Light Wheel Alignment | 2 |
| 21***30 | Horn | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Left Dashboard (4ws) (With Double Lower Equipment)
| 21***70 | Switch, Wheel Alignment | 1 |
| 21***90 | Warning Light Wheel Alignment | 2 |
| 21***30 | Horn | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Muffler And Piping
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Power Take Off
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***30 | Screw | 12 |
| 21***80 | Washer,Spring | 12 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Radiator And Piping
| 01***20 | Bolt,(Without Maintenance Monitor) | 3 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***60 | Bolt, Tube To Oil Cooler | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Right Dashboard
| 01***05 | Nut,(For Air Conditioner Less), Nut | 4 |
| 20***30 | Starting Switch,Starting | 1 |
| 21***61 | Switch, Air Conditioning | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Engine Related Parts And Electrical System : Self Fuel Supply Pump
| 01***14 | Bolt | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***23 | Washer,(With Auto Emergency Steering) | 4 |
Guard And Operator'S Cab
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Cabin (1/6)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***16 | Screw | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Cabin (2/6)
| 01***04 | Nut,(For Air Conditioner Less) | 4 |
| 01***08 | Washer,(For Fixed Type Ripper) | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Cabin (3/6)
| 01***70 | Screw | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 10 |
| 01***23 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Cabin (4/6)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Cabin (5/6)
| 21***40 | Ring, Snap | 8 |
| 21***10 | Roof Hatch, Assembly | 1 |
| 21***20 | Pin | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Cabin (6/6)
| 21***70 | Screw | 4 |
| 21***20 | Screw | 5 |
| 21***90 | Washer | 9 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Control Valve Side Cover
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Electrical System (Operator'S Cab)
| 01***60 | Bolt,(For Japan And Sweden) | 1 |
| 01***14 | Screw | 3 |
| 01***04 | Nut,(For Air Conditioner Less) | 3 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Engine Side Cover
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
| 01***40 | Bolt,(With Air Conditioner) | 5 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 11 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Floor Frame (2/2)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 8 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Floor Plate (1/2)
| 01***25 | Bolt,Without Revolution Sensor | 10 |
| 01***00 | Bolt - Cover Mounting | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 10 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Heating System
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***23 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : L.H. And R.H. View Mirror
| 01***20 | Screw | 4 |
| 01***25 | Screw | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Operator'S Cab (Equipment)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***05 | Nut,(For Air Conditioner Less), Nut | 2 |
| 01***23 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Operator'S Seat
| 01***14 | Screw | 4 |
| 21***60 | Washer,Spring | 4 |
| 21***01 | Operator'S Seat, Assembly | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Revolving Frame Under Cover
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 25 |
| 01***32 | Washer,(With Auto Emergency Steering) | 25 |
| 22***50 | Cover, L.H | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Soundproofing
| 21***20 | Rabbet | 25 |
| 22***10 | Sheet | 1 |
| 22***20 | Sheet | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Guard And Operator'S Cab : Top And Front Guard (Cab)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 4 |
| 01***35 | Screw | 2 |
Mark Plate
Komatsu : Pw75-1(S/N 0000001-Up) : Mark Plate : Accessories (Tbg Version) (1/2)
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 8 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 8 |
Komatsu : Pw75-1(S/N 0000001-Up) : Mark Plate : Accessories (Tbg Version) (2/2)
| 01***35 | Bolt | 1 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***20 | Screw | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Mark Plate : Equipment
| 01***16 | Bolt (With Air Heater & Conditioner) | 0 |
| 21***80 | Washer | 0 |
| 21***20 | Pin, Cotter | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Mark Plate : Mark Plate
| 01***08 | Washer,(For Fixed Type Ripper) | 2 |
| 21***40 | Nut | 2 |
| 21***20 | Plate, Max. Speed 20 Km/H (Germany) | 3 |
Komatsu : Pw75-1(S/N 0000001-Up) : Mark Plate : Tool
| 21***69 | Overalls (Optional) | 1 |
| 21***70 | Wrench | 1 |
| 21***90 | Box Wrench (32 mm) | 1 |
Swing Circle And Final Drive
Komatsu : Pw75-1(S/N 0000001-Up) : Swing Circle And Final Drive : Swing Circle
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***80 | Bolt,(For Adjustable Rod) | 3 |
| 01***90 | Bolt | 36 |
Komatsu : Pw75-1(S/N 0000001-Up) : Swing Circle And Final Drive : Swing Machinery (1/2)
| 04***12 | Ring, Snap (4) | 6 |
| 07***65 | Seal,Oil Output Shaft | 1 |
| 07***00 | Fitting, Grease (Steering Cylinder) | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Swing Circle And Final Drive : Swing Machinery (2/2)
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 10 |
| 01***00 | Bolt, Mount Back-Up Alarm | 12 |
| 01***32 | Washer,(With Auto Emergency Steering) | 12 |
Under Carriage
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Axles Fixing
| 01***30 | Bolt,(For Rubber Shoe) | 1 |
| 01***35 | Screw | 6 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (2ws) (1/6)
| 21***20 | Breather | 1 |
| 21***80 | Ring, Snap | 1 |
| 21***90 | Plug | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (2ws) (2/6)
| 21***90 | Spring Washer | 12 |
| 21***20 | O-Ring | 1 |
| 21***40 | Protection | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (2ws) (3/6)
| 21***50 | Plug | 2 |
| 22***20 | Casing | 2 |
| 22***30 | Nut | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (2ws) (4/6)
| 21***20 | Steering Coloumn | 16 |
| 21***40 | O-Ring | 2 |
| 21***50 | Nut | 16 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (2ws) (5/6)
| 21***50 | Ring, Wear | 6 |
| 21***90 | Screw | 2 |
| 21***40 | O-Ring | 6 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (2ws) (6/6)
| 22***60 | Tie-Rod | 2 |
| 22***70 | Cylinder | 1 |
| 22***80 | O-Ring | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (4ws) (1/6)
| 21***20 | Breather | 1 |
| 21***80 | Ring, Snap | 1 |
| 21***90 | Plug | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (4ws) (2/6)
| 21***90 | Spring Washer | 12 |
| 21***20 | O-Ring | 1 |
| 21***40 | Protection | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (4ws) (3/6)
| 21***50 | Plug | 2 |
| 22***20 | Casing | 2 |
| 22***30 | Nut | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (4ws) (4/6)
| 21***20 | Steering Coloumn | 16 |
| 21***40 | O-Ring | 2 |
| 21***50 | Nut | 16 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (4ws) (5/6)
| 21***50 | Ring, Wear | 6 |
| 21***90 | Screw | 2 |
| 21***40 | O-Ring | 6 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Front Axle (4ws) (6/6)
| 22***60 | Tie-Rod | 2 |
| 22***80 | O-Ring | 1 |
| 22***90 | Screw | 5 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Brake Line) (1/3)
| 01***25 | Screw | 4 |
| 21***10 | Pressure Switch | 1 |
| 21***20 | Pressure Switch | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Brake Line) (2/3)
| 01***10 | Screw | 2 |
| 21***70 | Union | 2 |
| 21***20 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Brake Line) (3/3)
| 01***30 | Bolt,Stopper | 3 |
| 01***23 | Washer,(With Auto Emergency Steering) | 3 |
| 21***70 | Union | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Drain Line)
| 21***90 | Union | 1 |
| 21***30 | Elbow | 1 |
| 21***50 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Parking Brake)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
| 21***80 | Union | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Steering Line) (2ws)
| 01***30 | Bolt,Stopper | 3 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 3 |
| 21***80 | Union | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Steering Line) (4ws) (1/2)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,Stopper | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Steering Line) (4ws) (2/2)
| 01***30 | Bolt,Stopper | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
| 21***80 | Union | 3 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Transmission Line)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping (Travel Motor Line) (Lower)
| 01***35 | Screw | 4 |
| 01***40 | Bolt,(Tm8072-123) | 2 |
| 01***10 | Screw | 6 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Hydraulic Piping Suspension Lock Cylinder Line
| 01***20 | Bolt,(Without Maintenance Monitor) | 8 |
| 01***40 | Bolt,(With Center Guard) | 8 |
| 01***30 | Bolt,Stopper | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Propeller Shaft
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 16 |
| 21***70 | Nut | 16 |
| 22***00 | Welle | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (2ws) (1/6)
| 21***70 | Protection | 1 |
| 21***80 | Switch | 1 |
| 21***90 | Washer | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (2ws) (2/6)
| 21***80 | Slide Block | 2 |
| 21***30 | Bearing | 4 |
| 21***30 | Piston | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (2ws) (3/6)
| 21***20 | Breather | 1 |
| 21***10 | Plug | 3 |
| 21***20 | Dowel | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (2ws) (4/6)
| 21***40 | Bearing | 1 |
| 21***90 | Spring Washer | 12 |
| 21***70 | Bolt | 12 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (2ws) (5/6)
| 21***40 | Brake Cylinder | 1 |
| 21***41 | Brake Cylinder | 1 |
| 21***50 | Plug | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (2ws) (6/6)
| 21***20 | Steering Coloumn | 16 |
| 21***40 | O-Ring | 2 |
| 21***50 | Nut | 16 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (4ws) (1/7)
| 21***70 | Protection | 1 |
| 21***80 | Switch | 1 |
| 21***90 | Washer | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (4ws) (2/7)
| 21***80 | Slide Block | 2 |
| 21***30 | Bearing | 4 |
| 21***30 | Piston | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (4ws) (3/7)
| 21***20 | Breather | 1 |
| 21***80 | Ring, Snap | 1 |
| 21***90 | Plug | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (4ws) (4/7)
| 21***40 | Bearing | 1 |
| 21***90 | Spring Washer | 12 |
| 21***70 | Bolt | 12 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (4ws) (5/7)
| 21***50 | Plug | 2 |
| 22***20 | Casing | 2 |
| 22***30 | Nut | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (4ws) (6/7)
| 21***20 | Steering Coloumn | 16 |
| 21***40 | O-Ring | 2 |
| 21***50 | Nut | 16 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Rear Axle (4ws) (7/7)
| 21***40 | Brake Cylinder | 1 |
| 21***50 | Plug | 2 |
| 21***70 | Dowel | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Under Carriage
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Wheel
| 21***50 | Valve | 8 |
| 21***60 | Extension Valve | 4 |
| 21***70 | Ring | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Wheel (Optionals)
| 21***12 | Rim | 8 |
| 21***20 | Tyre (8.25-20 10pr) | 8 |
| 21***30 | Inner Tube (8.25-20 10pr) | 8 |
Komatsu : Pw75-1(S/N 0000001-Up) : Under Carriage : Wheels (Optionals)
| 21***11 | Tyre (405-70 R18 Spt9) | 4 |
| 21***40 | Valve | 4 |
| 21***50 | Rim (13x18) | 8 |
Work Equipment
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : 1st Boom
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 21***20 | Bushing | 2 |
| 21***40 | Spacer | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : 2nd Boom
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***10 | Bolt,(Noise Suppression Spec.) | 2 |
| 20***40 | Spacer? 1.0mm | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : 2nd Boom Cylinder : Unit_02_of_02
| 21***10 | Screw | 12 |
| 21***80 | Nut | 2 |
| 21***00 | Spring Washer | 12 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : 2nd Boom Cylinder : Unit_01_of_02
| 21***10 | Screw | 12 |
| 21***00 | Spring Washer | 12 |
| 21***40 | Fitting | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Arm Cylinder
| 01***25 | Bolt,See Fig. K4010-65a0 | 1 |
| 21***10 | Screw | 6 |
| 21***40 | Bushing | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Arm, L=1700 Mm
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 20***40 | Spacer? 1.0mm | 4 |
| 21***10 | Bushing | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Arm, L=2100 Mm
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 20***40 | Spacer? 1.0mm | 4 |
| 21***10 | Bushing | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Boom
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 20***40 | Spacer? 1.0mm | 2 |
| 21***50 | Nut | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Boom Cylinder
| 21***10 | Screw | 6 |
| 21***00 | Spring Washer | 6 |
| 21***40 | Fitting | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Boom Swing Cylinder
| 01***30 | Screw | 8 |
| 21***10 | Screw | 12 |
| 21***40 | Bushing | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Bucket
| 21***30 | Bucket, L=500 mm | 1 |
| 21***40 | Bucket, L=400 mm | 1 |
| 21***50 | Bucket, L=300 mm | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Bucket Cylinder
| 21***10 | Screw | 6 |
| 21***40 | Bushing | 2 |
| 21***00 | Spring Washer | 6 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Bucket Link
| 20***40 | Spacer? 1.0mm | 10 |
| 21***20 | Bushing | 2 |
| 21***10 | Bushing | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Front Blade
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
| 20***40 | Spacer? 1.0mm | 8 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Front Outrigger
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 01***70 | Bolt,(For Rops) | 9 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Hydraulic Piping (Additional Equipment) (Arm Side)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 21***50 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Hydraulic Piping (Additional Equipment) (Boom Side)
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
| 01***45 | Bolt, Bracket Mounting | 2 |
| 21***70 | Pipe, L.H | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Hydraulic Piping (Additional Equipment) (For 2-Piece Boom) (Boom Side)
| 21***60 | Union | 1 |
| 21***70 | Union, Assembly | 1 |
| 21***40 | Hose | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Hydraulic Piping (Additional Equipment) (Optional Cock)
| 21***50 | Union | 2 |
| 21***80 | Union | 1 |
| 21***10 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Hydraulic Piping (Fast Coupling Bucket Line)
| 20***40 | Spacer? 1.0mm | 4 |
| 21***80 | Pin | 2 |
| 21***80 | Union | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Hydraulic Piping (For Additional Equipment)
| 21***10 | Union | 2 |
| 21***50 | Elbow | 1 |
| 21***70 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Hydraulic Piping Hammer
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***50 | Screw | 4 |
| 01***25 | Bolt, Seal Cover Mounting | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Outrigger Or Blade Cylinder
| 21***10 | Screw | 12 |
| 21***40 | Bushing | 2 |
| 21***00 | Spring Washer | 12 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Rear Blade
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
| 20***40 | Spacer? 1.0mm | 8 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Rear Outrigger
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 4 |
| 20***40 | Spacer? 1.0mm | 16 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment : Swing Bracket
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 3 |
| 01***40 | Bolt,(With Center Guard) | 2 |
Work Equipment Control System
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Control Valve (1/7)
| 01***30 | Screw | 38 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 38 |
| 57***20 | O-Ring | 19 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Control Valve (2/7)
| 07***20 | O-Ring,Cover? Transfer Case | 9 |
| 07***10 | O-Ring,Plate | 8 |
| 07***12 | O-Ring, Divider Valve Mounting | 3 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Control Valve (3/7)
| 07***20 | O-Ring,Cover? Transfer Case | 1 |
| 07***10 | O-Ring,Plate | 1 |
| 07***34 | O-Ring,(For Front Attachment) | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Control Valve (4/7)
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 07***07 | O-Ring - (K10) | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Control Valve (5/7)
| 07***09 | O-Ring,(For Dual Tilt Dozer) | 1 |
| 07***16 | O-Ring,Suction And Relief Valve | 1 |
| 07***09 | Ring,Back-Up (Kit) | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Control Valve (6/7)
| 07***07 | O-Ring - (K10) | 2 |
| 07***34 | O-Ring,(Not Used When (B) Spec.) | 1 |
| 07***34 | O-Ring,(For Without Brake Assistor) | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Control Valve (7/7)
| 01***30 | Screw | 4 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 4 |
| 07***20 | O-Ring,Cover? Transfer Case | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (2nd Boom Cylinder Line)
| 01***30 | Screw | 16 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Arm Cylinder Line)
| 01***55 | Bolt,(10m) | 3 |
| 01***30 | Screw | 8 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Arm Cylinder Line) (For 2-Piece Boom)
| 01***30 | Screw | 8 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 2 |
| 21***30 | Flange | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Arm Cylinder Line) (Safety Valve)
| 01***80 | Bolt,(For Long Lever Control) | 4 |
| 01***30 | Screw | 8 |
| 21***60 | Hose-Clamp | 20 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Boom Cylinder Line)
| 01***30 | Screw | 8 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 10 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Boom Cylinder Line) (Safety Valve)
| 01***25 | Screw | 4 |
| 01***30 | Screw | 12 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Boom Cylinder Line) (With 2-Pieces Boom)
| 01***30 | Screw | 8 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 10 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Boom Swing Cylinder Line)
| 21***60 | Hose-Clamp | 1 |
| 21***30 | O-Ring | 1 |
| 21***30 | Hose-Clamp | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Bucket Cylinder Line)
| 01***30 | Screw | 8 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Bucket Cylinder Line) (For 2-Piece Boom)
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 8 |
| 01***35 | Bolt, Mount Bracket To Floor | 4 |
| 21***30 | Union, Assembly | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Delivery Line)
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 3 |
| 01***35 | Screw | 4 |
| 01***30 | Screw | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Front And Rear Outrigger) (1/2)
| 01***70 | Screw | 4 |
| 21***50 | Union | 1 |
| 21***60 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Front Blade With Rear Outrigger) (1/2)
| 01***70 | Screw | 4 |
| 21***50 | Union | 1 |
| 21***60 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Front Blade With Rear Outrigger) (2/2)
| 01***30 | Bolt | 2 |
| 01***30 | Bolt,Stopper | 4 |
| 01***30 | Screw | 16 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Mode System - Load Sensing)
| 21***50 | Union | 1 |
| 21***90 | Union | 1 |
| 21***20 | Elbow | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Oil Cooler And Return Line)
| 21***60 | Union | 1 |
| 21***40 | Elbow | 1 |
| 21***40 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Outrigger Solenoid Valve Line) (Rear)
| 21***20 | Elbow | 2 |
| 21***30 | Elbow | 1 |
| 21***50 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Overload Sensor Line)
| 01***40 | Screw | 2 |
| 21***00 | Elbow | 4 |
| 21***10 | Union Tee | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Ppc Piping) (1/3)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***20 | Screw | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Ppc Piping) (2/3)
| 21***90 | Union | 4 |
| 21***30 | Elbow | 2 |
| 21***20 | Union | 3 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Ppc Piping) (3/3)
| 21***80 | Union | 1 |
| 21***50 | Union | 2 |
| 21***60 | Union | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Rear And Front Outrigger) (2/2)
| 01***30 | Bolt | 4 |
| 01***30 | Bolt,Stopper | 4 |
| 01***30 | Screw | 16 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Rear Outrigger)
| 01***30 | Bolt | 2 |
| 01***30 | Bolt,Stopper | 4 |
| 01***30 | Screw | 16 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Steering Line) (1/2)
| 01***60 | Bolt,(For Japan And Sweden) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Steering Line) (2/2)
| 01***35 | Bolt, Mount Bracket To Floor | 4 |
| 21***90 | Union | 3 |
| 21***20 | Elbow | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Suction Line)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 4 |
| 01***35 | Screw | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Swing Motor Line)
| 21***90 | Union | 1 |
| 21***50 | O-Ring | 2 |
| 21***10 | O-Ring ` | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping (Travel Line) (Upper)
| 21***90 | Union | 1 |
| 21***30 | Elbow | 1 |
| 21***40 | O-Ring | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping Blade
| 21***20 | Elbow | 1 |
| 21***30 | Elbow | 1 |
| 21***30 | O-Ring | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Piping Rear Blade
| 01***30 | Bolt | 2 |
| 01***30 | Bolt,Stopper | 4 |
| 01***30 | Screw | 16 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Pump (1/4)
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
| 04***12 | Ring, Snap | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Pump (2/4)
| 01***05 | Nut,(For Air Conditioner Less), Nut | 1 |
| 04***18 | Bolt,(With Main Clutch Cooler) (D60p) | 1 |
| 07***23 | O-Ring,(For 2nd Travel Speed) (Op) | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Pump (3/4)
| 04***20 | Ring, Snap | 1 |
| 70***80 | Cylinder Block, Assembly | 1 |
| 70***60 | Spacer | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Pump (4/4)
| 01***06 | Nut | 1 |
| 70***40 | Pc Valve, Assembly | 1 |
| 70***30 | Ls Valve, Assembly | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Hydraulic Tank
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Ppc Valve (For Travel)
| 01***30 | Bolt,Stopper | 1 |
| 01***18 | Screw | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Ppc Valve For Blade, Boom Swing, 2-Piece Boom
| 01***25 | Bolt, Seal Cover Mounting | 2 |
| 70***30 | Ppc Valve, Assembly | 1 |
| 70***40 | Shim - 0.012 In. (0.30 mm) | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Ppc Valve, L.H.
| 21***31 | Lever | 1 |
| 21***30 | Articulation | 1 |
| 22***20 | Ppc Valve, L.H., Assembly | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Ppc Valve, R.H.
| 21***33 | Knob, Assembly | 1 |
| 21***30 | Articulation | 1 |
| 21***30 | Kit, Push-Button | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Servocontrol Feed Unit
| 01***16 | Screw | 2 |
| 01***25 | Screw | 2 |
| 01***40 | Screw | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Swing Motor (1/2)
| 04***18 | Ring,Snap (Itl) | 1 |
| 70***81 | Swing Motor, Assembly | 1 |
| 70***50 | Engine, Assembly | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Swing Motor (2/2)
| 07***34 | O-Ring,(For Front Attachment) | 2 |
| 70***41 | Safety Valve | 2 |
| 70***10 | Plug | 2 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Swivel Joint
| 21***40 | Screw | 2 |
| 21***30 | O-Ring | 1 |
| 21***20 | Grommet | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Swivel Joint (Mounting Parts)
| 01***40 | Bolt,(With Service Valve R.H.) | 4 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 1 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 4 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Travel Motor (1/2)
| 22***00 | Travel Motor, Assembly | 1 |
| 22***10 | Ring, Snap | 1 |
| 22***20 | Ring, Snap | 1 |
Komatsu : Pw75-1(S/N 0000001-Up) : Work Equipment Control System : Travel Motor (2/2)
| 22***30 | O-Ring | 1 |
| 22***90 | Relief Valve, Assembly | 2 |
| 22***30 | Piston | 1 |
PW75-1(S/N 0000001-Up) serial number reference
The ID plate sits riveted to the machine frame, usually on the right-hand side near the swing frame or cab base, and the number is also stamped into the frame steel itself so it can be cross-checked if the plate is painted over or missing. For this pre-ISO-PIN era machine the plate reads the model designation "PW75-1" followed directly by a plain running serial number, with no separate alpha chassis code to decode - just match the stamped digits against the parts/service manual's stated serial range.
| Prefix | Identifies | Notes |
|---|---|---|
| 0000001-Up | Standard PW75-1 (single production block) | Whole PW75-1 run falls under one continuous serial block, no internal alpha or numeric sub-prefix split found in available references. Built roughly 1998-1999 before Komatsu replaced it with the PW75-2 in 1999. Fitted with the Komatsu 4D98E diesel (a Yanmar-built 4TNE98-block engine), rated about 51 kW (68 hp) at 2300 rpm. This is a wheel (rubber-tired) excavator, so the standard-vs-long-undercarriage split used on crawler models does not apply here; no wheelbase or axle-config variant is documented for this run. Treat any claim of a narrower internal serial break as unverified - confirm with a Komatsu dealer using the actual PIN. |
Frequently asked questions
What engine does the Komatsu PW75-1 use?
It uses Komatsu's own 4D98E, a naturally aspirated 4-cylinder diesel built on the Yanmar 4TNE98 architecture, rated 51 kW (68.4 hp) at 2300 rpm from 3.32 L displacement. It is mechanically governed with no electronic engine controls or digital fault codes.
What is the operating weight of the PW75-1?
Around 7,500 kg (16,535 lb) in standard configuration. Some spec sheets list this class up to roughly 8,050 kg depending on boom type, blade, and cab fitment, so treat the figure as a range that varies by configuration.
What replaced the Komatsu PW75-1?
Komatsu replaced it directly with the PW75-2 around 1999-2001, which kept the same 4D98E engine and weight class but offered a larger bucket option. The size class was later carried forward into the separate PW75R-2 generation with its own updated specification and serial range.
What PW75-1(S/N 0000001-Up) owners discuss
What engine does the PW75-1 (S/N 0000001-Up) actually run, and why does that trip people up when sourcing parts?
This serial range carries the Komatsu-badged 4D98E, a water-cooled 4-cylinder diesel built on the Yanmar 4TNE98 block, rated around 51 kW (68 hp), with rated speed cited anywhere from 2,300 to 2,500 rpm depending on the source - treat that spread as normal rather than a red flag. It is not the 4D95L-family engine fitted to the tracked PC75UU-1 of the same vintage, so do not cross-shop injection pumps, head gaskets, or overhaul kits between the two machines even though the frame size and build years look similar. Because the block is Yanmar-sourced, overhaul kits and gaskets are legitimately cross-listed under both Yanmar and Komatsu part families - that dual listing is normal, not a sign of a mismatched part.
What hydraulic behavior is normal versus a warning sign on this machine?
Factory relief setting on the main circuit runs around 400 bar (5,900 psi) with pump flow near 227 L/min (60 US gpm), so a healthy machine should feel brisk on every function once warmed up. Owners of this excavator family note that a manual bypass valve spliced into the hydraulic lines by a previous owner will make every function feel sluggish unless it is closed, and that points to an underlying load-sensing pump or distributor fault, not a normal adjustment point. A machine that only runs properly with an odd valve left in a certain position was likely patched around a pump or distributor problem rather than repaired.
The steering-mode or stabilizer selector stops responding - what is usually at fault?
On this compact wheeled excavator family, front/rear/four-wheel steering and stabilizer mode selection runs through an electronic control panel that signals solenoid valves on the load-sensing hydraulic circuit. A selector that goes dead can mean either the load-sensing pump or distributor is losing signal pressure, or the control panel itself has stopped sending a signal to the solenoids - both give the identical symptom of a selector doing nothing. Field troubleshooting isolates it by disconnecting the load-sensing signal lines one at a time (pump side versus pedal/brake side) to see which restores normal pump loading; a dead panel can sometimes be bridged with manual toggle switches wired straight to the solenoids as a temporary measure. Because this affects steering and stabilizer function, have your dealer verify the diagnosis and sign off on any manual-switch workaround before the machine goes back to work.
What wear pattern should I expect on the axles, tires, and steering linkage on a wheeled machine like this?
Expect wear to concentrate at the oscillating axle pivot pins and bushings, the steering cylinder pins and bellcrank, and where the front axle bolts to the main frame, since this machine has no crawler frame to absorb dig-and-swing shock loads. Tire wear that is uneven side-to-side or feathered across the tread usually points to steering geometry or axle bushing wear rather than tire quality, so read the tread before blaming the rubber. Some slow leak-down of a lowered stabilizer leg over several hours or overnight is considered normal for this class of machine; a leg that drops within minutes under load points to a cylinder seal or check-valve problem instead.
Are there known joystick or pilot-valve quirks on this era of compact Komatsu excavator?
The pilot control valve uses small u-cup seals around the spool pistons at the top of the valve body, and these are usually the first thing to weep oil as the machine ages, showing up as a damp valve top or a joystick that feels spongy. A boom or attachment that creeps down with the joystick centered more often points to wear or scoring inside the spool bore for that circuit, or debris in the relief cartridge, than to the cylinder itself - a pressure test on the cylinder first rules that out before the valve is pulled apart. Because uncontrolled attachment drop is a safety issue during service or transport, have your dealer verify which stage - valve or cylinder - is at fault before anyone works under a raised attachment.
What are the early warning signs of a wearing fuel system on this engine?
Because the 4D98E uses a mechanical inline injection pump rather than common-rail electronics, wear shows up gradually: harder cold starts, a rougher idle, and a step down in power under load, usually well before anything trips a warning light. Watch for black smoke under acceleration and reluctance to fire through the glow-plug cycle as signs the pump is nearing the point where a rebuild is more economical than another round of filter changes. Since one metering unit feeds all cylinders, a worn pump drags down every cylinder at once rather than causing a single rough cylinder, which helps separate pump wear from an injector or glow-plug fault.
What should I check specifically before buying a used PW75-1 (S/N 0000001-Up)?
Cycle the steering through full lock in both directions and confirm the front/rear/four-wheel steering mode selector responds immediately, since electronic-selector and load-sensing pump faults are a known weak spot on this family. Inspect the axle oscillation pins, steering cylinder pins, and the front-axle-to-frame mounting for play or weld repairs, and read the tires for uneven or feathered wear that hints at worn steering linkage rather than just old rubber. Run every hydraulic function together at operating temperature to confirm the pump still delivers full flow under combined load - a machine that feels strong on one function alone but bogs down when two run together often has a tired pump or a hidden bypass valve. Finally, confirm the engine on the serial plate matches the 4D98E expected for this range rather than a swapped 4D95-family unit, since a mismatched engine complicates parts sourcing and resale. Have your dealer verify hydraulic pressures and check the lines for any hidden bypass valve before final purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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