Komatsubulldozermedium (d40 - d75)
Komatsu D40A-1(S/N 1501-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu D40A-1 (S/N 1501-UP) is a small-to-mid class crawler dozer from the late 1970s, powered by Komatsu's S4D105 naturally aspirated 4-cylinder diesel rated 59.7 kW (80 hp) at 2400 rpm with 3.98 L displacement and no ECM - a purely mechanical fuel system typical of the era. Operating weight runs about 9,320 kg (20,547 lb). Drive is direct-drive (DD), 4 forward and 3 reverse gears, with dry multi-disc steering clutches and external contracting brakes rather than a torque converter or powershift. For this serial range the machine is documented only with a straight dozer blade, about 3.17 m (10.4 ft) wide and 0.75 m (29.6 in) tall - no XL, LGP, SU, angle, or VPAT configuration is confirmed for S/N 1501-UP. It sits above Komatsu's D31 class and below the D50 class in the period lineup, and predates Komatsu's later 3-character alpha PIN prefix serial scheme.
Komatsu carried the D40 designation forward past this -1 block into later D40A-3 and D40A-5 generations, plus the related D41A line, which moved to different engines and Komatsu's newer alpha-prefix PIN serial numbering - those specs do not carry back onto this early 1501-UP production run. Because the D40A-1 predates emission controls and electronic engine management entirely, it survives in today's used and parts market as a mechanically simple, easily wrenched platform. Most demand centers on undercarriage wear parts (track links, rollers, idlers, sprockets), steering clutch and external contracting brake components, and S4D105 engine overhaul parts, since machines in this serial range are well past factory service life and typically running on rebuilt or reconditioned drivetrains rather than original components.
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 D40A-1(S/N 1501-UP) specifications
Engine
| Engine model | Komatsu S4D105, naturally aspirated 4-cylinder diesel |
| Gross power | 59.7 kW (80 hp) at 2,400 rpm |
| Displacement | 3.98 L / 3,980 cc (242.9 cu in) |
| Emissions tier | Pre-emissions era design (late-1970s release); no EPA/EU tier rating published for this serial range |
Weights
| Operating weight (standard configuration) | 9,320 kg (20,547 lb) |
| Configuration note | Only one standard track/blade configuration documented for S/N 1501-UP; no separate XL or LGP variant published for this serial range |
Dimensions
| Overall length, blade down | 4.27 m (14.0 ft) |
| Overall length, without blade | 3.29 m (10.8 ft) |
| Overall height, top of cab/canopy | 2.62 m (8.6 ft) |
| Overall width over tracks | 1.95 m (6.4 ft) |
| Ground clearance | 0.37 m (1.2 ft) |
| Track length on ground | 2.07 m (6.8 ft) |
| Track gauge | 1.55 m (5.1 ft) |
| Track shoe width (standard) | 400 mm (15.8 in) |
| Track pitch | 175 mm (6.9 in) |
| Track shoes per side | 37 |
| Track rollers per side | 5 |
| Carrier rollers per side | 1 |
Performance
| Travel speed, forward | 4 gears, up to 9.7 km/h (6.0 mph) top gear |
| Travel speed, reverse | 3 gears, up to 7.7 km/h (4.8 mph) top gear |
| Drivetrain type | Direct-drive powertrain: mechanical gear transmission with dry multi-disc steering clutches and external contracting brakes, no torque converter |
| Ground pressure, standard shoe | 0.5 kg/cm² (7.2 psi) |
| Drawbar pull | Not documented in available spec sheets for this exact serial range — verify with your dealer or the factory shop manual |
| Gradeability | Not documented in available spec sheets for this exact serial range — verify with your dealer or the factory shop manual |
Blades
| Standard (S) blade width | 3.17 m (10.4 ft) |
| Standard (S) blade height | 0.75 m (29.6 in) |
| Standard blade cutting depth | 380 mm (15 in) |
| Other blade types (SU/A/VPAT) | No angle, semi-U, or VPAT blade option published for this serial range; standard straight blade only |
Service capacities
| Fuel tank | 210 L (55.5 gal) |
| Cooling system | 34 L (9.0 gal) |
| Engine oil | Not documented in available spec sheets for this exact serial range — verify with your dealer or the factory shop manual |
| Hydraulic system | Not documented in available spec sheets for this exact serial range — verify with your dealer or the factory shop manual |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D40A-1(S/N 1501-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (w/ filter) | Not documented for this exact serial range in available sources — verify with your dealer or the shop manual lubrication chart. | Komatsu genuine diesel engine oil (EO), viscosity graded to ambient temperature per Komatsu's standard climate chart for the era (roughly SAE 10W for below 0C, SAE 30 for 10-35C, SAE 10W-30 or 15W-40 multigrade acceptable across a wider range) — exact grade table not confirmed for this serial range. |
| Cooling system | Approx. 34 L (9.0 US gal) | Water plus Komatsu genuine antifreeze/coolant (ethylene-glycol base) for freeze protection; supplemental coolant additive per Komatsu maintenance interval where specified. |
| Fuel tank | Approx. 210 L (55.5 US gal) | Diesel fuel, ASTM No. 2-D grade (or No. 1-D in cold climates), per Komatsu OMM fuel spec of the period. |
| Transmission (direct-drive gear case) | Not documented for this exact serial range in available sources — verify with your dealer or the shop manual lubrication chart. | Komatsu genuine transmission/powertrain oil (TO) — exact grade not confirmed for this serial range. |
| Bevel gear case / steering clutch compartment | Not documented for this exact serial range in available sources — verify with your dealer or the shop manual lubrication chart. | Komatsu genuine gear oil per the OMM's bevel gear/steering clutch spec — exact grade not confirmed for this serial range. |
| Final drive (each side) | Not documented for this exact serial range in available sources — verify with your dealer or the shop manual lubrication chart. | Komatsu genuine final drive gear oil (AXO/TO-class) — exact grade not confirmed for this serial range. |
| Hydraulic system/tank | Not documented for this exact serial range in available sources — verify with your dealer or the shop manual lubrication chart. | Komatsu genuine hydraulic oil (HO) — exact grade not confirmed for this serial range. |
| Pivot shaft | Not listed as a separate lubrication point in available sources for this model. | Not applicable / not documented. |
| Grease points | Not documented (quantity per point not specified in available sources). | Komatsu genuine multipurpose grease (lithium-base EP grease), applied at OMM-specified service intervals to pins, bushings, and blade linkage. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu D40A-1(S/N 1501-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 |
|
Servicing the D40A-1(S/N 1501-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
The D40A-1 carries no ECM, so there are no fault codes or telematics to lean on - predictive care here means scheduled oil sampling. Pull engine oil samples from the S4D105 at every 250-hour change to catch wear-metal trends before the naturally aspirated block shows symptoms. Sample direct-drive transmission and final drive case oil at 1000-hour changes; debris there often reflects steering clutch and external contracting brake condition. Track pitch elongation and sprocket wear measured on a physical gauge substitute for fluid trending on the undercarriage.
Corrective & Common Repairs
Most corrective work on this serial range centers on the dry multi-disc steering clutches and external contracting brakes - slip under load or a spongy brake lever usually means disc or band replacement once adjustment travel runs out. The S4D105's mechanical injection pump and governor linkage drift with age; rough idle or power loss traces there more often than the fuel system itself. Track sag beyond spec accelerates bushing and sprocket wear quickly on this size undercarriage, so sag checks catch problems before they compound.
Overhaul & Rebuild Points
Engine overhauls center on the S4D105's cylinder liners, pistons, and mechanical injectors - a naturally aspirated block with no turbocharger to complicate teardown, but injection pump timing needs resetting on reassembly. Steering clutch and external contracting brake overhauls typically mean replacing discs and bands together, since both wear on the same duty cycle. Direct-drive transmission and final drive rebuilds focus on gear and bearing backlash rather than clutch packs, since this machine never carried a torque converter or powershift.
Seasonal & Environment Servicing
Cold weather hits this mechanical NA diesel hard at startup - check the intake air heater or starting aid and keep batteries in good condition ahead of freezing temperatures, since there is no electronic glow-plug system to fall back on. Verify coolant freeze protection on the roughly 34 L (9.0 US gal) cooling system every season change. Dry multi-disc steering clutches and external contracting brakes are more sensitive to dust intrusion than a sealed wet system, so tighten inspection intervals on dusty sites and adjust track tension for mud versus rocky ground.
D40A-1(S/N 1501-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 07000-02135 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 07000-02075 | O-Ring,Steering Oil Filter | Lubrication service | Check fitment → |
| 08036-01414 | Clip,(For Add.Filter)(Except Japan) | Scheduled service item | Check fitment → |
| 600-181-8210 | Element,Outer | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D40A-1(S/N 1501-UP) attachments & work tools
Blades
The D40A-1 carries an angle-type dozer blade (the "A" in the model name denotes the angling variant, distinct from the D40P straight/LGP blade sibling) around 3.17 m (10 ft 5 in) wide and about 0.75 m (29.6 in) tall, with roughly 0.38 m (15 in) of cutting depth. This is a 1970s-era mechanical/cable or hydraulic-tilt angle blade; factory VPAT and semi-U/full-U (SU/U) blade options associated with later Komatsu classic-series dozers are not documented for this serial range and are not expected on this generation.
Rippers
A rear-mounted single-shank ripper is the type typically fitted to dozers in this weight class (around 9.3 t operating weight); no factory multi-shank ripper option is documented for the D40A-1 specifically for this serial range. Ripper weight and shank/tip specifics are not published for this exact configuration - confirm availability and capacity with a Komatsu dealer or the shop manual for this model.
Winches
A PTO-driven towing winch (clutch and brake-drum assembly off the transmission, rear-mounted) was a common factory option across Komatsu's classic small/mid dozer range of this era, and the D40A-1 falls in that same drivetrain family. Exact drum capacity and cable specifications are not documented for this serial range; treat as a plausible period option to verify rather than a confirmed rated figure.
Drawbars/Counterweights
A rear drawbar for towing rippers, trailers, or logging arches is standard equipment on dozers of this class and era. No separate counterweight package is documented specifically for the D40A-1; counterweighting on this family is more associated with the straight-blade/swamp siblings for blade-load balance, not confirmed for the A (angle) variant.
Cab/ROPS Guarding
Factory documentation for this serial range lists a ROPS canopy and a separate head guard as distinct work-equipment groups, consistent with an open operator station (top-of-cab height near 2.6 m/8.6 ft) rather than an enclosed cab. Forestry-spec brush/root guarding, screened canopy panels, and belly guards are associated with the later Forestry Spec sibling in this family, not confirmed as a factory option on the D40A-1 itself.
Hydraulic Arrangement
Front hydraulic circuit powers blade lift and tilt/angle functions off the engine-driven pump; the direct-drive (DD) power train confirmed for this model runs 4 forward/3 reverse gears with mechanical steering clutches, typical of this dozer's mechanical-transmission generation. A rear PTO shaft and clutch, separate from the blade circuit, is the expected drive path for an optional ripper or towing winch, though a dedicated rear ripper hydraulic circuit is not documented for this exact serial range.
All D40A-1(S/N 1501-UP) assemblies by section
Every catalogued assembly group for the Komatsu D40A-1(S/N 1501-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine Related Parts And Electrical System
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Battery
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 8 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Compression Release Lever(#1501-2200)
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Electrical System (For 800w Alternator)(#2201-)
| 08***14 | Clip,(Not Shown) | 2 |
| 12***40 | Wire | 1 |
| 12***10 | Wire Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Electrical System(#1501-2200)
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
| 01***20 | Bolt,(Used When Towing Winch) | 10 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Electrical System(#2201-)
| 01***16 | Bolt (Welded) | 2 |
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Engine Mounting Parts(#1501-2200)
| 01***40 | Bolt,(Not Used With Cab) | 4 |
| 01***05 | Bolt | 4 |
| 01***42 | Washer,Spring (For Pedal Steering) | 8 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Engine Mounting Parts(#2201-)
| 01***50 | Bolt | 2 |
| 01***20 | Bolt,Front (Except Japan) | 2 |
| 01***45 | Bolt | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Fuel Control Lever(#1501-2200)
| 01***12 | Bolt,(Without R.P.C.U.) | 3 |
| 01***16 | Bolt (Welded) | 3 |
| 01***20 | Bolt | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Fuel Control Lever(#2201-)
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Fuel Control Linkage(#1501-2200)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***40 | Bolt | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Fuel Tank (With Fuel Strainer) (Except Japan)(#2201-)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
| 01***25 | Bolt,(For Slag Handling) | 6 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Fuel Tank(#1501-2200)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 4 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 6 |
| 01***25 | Bolt,(For Slag Handling) | 6 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Fuel Tank(#2201-)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
| 01***25 | Bolt,(For Slag Handling) | 6 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Instrument Panel(#1501-2200)
| 01***10 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***20 | Bolt,(Without Maintenance Monitor) | 2 |
| 01***20 | Screw | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Instrument Panel(#2201-)
| 01***20 | Bolt | 2 |
| 01***20 | Screw - Turn Signal And Parkinglight Mounting | 2 |
| 01***12 | Screw,(With Articulate Indicator) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Radiaor Cover And Piping(#1501-2200)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt - Rear Guard Mounting | 12 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Radiator Cover And Piping(#2201-)
| 01***10 | Bolt,(For Shipping) | 3 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 10 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Radiator(#1501-2200)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 44 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Engine Related Parts And Electrical System : Radiator(#2201-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 44 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 8 |
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 12 |
Guard
Komatsu : D40a-1(S/N 1501-Up) : Guard : Bottom Guard
| 01***25 | Bolt - Rear Guard Mounting | 5 |
| 01***35 | Bolt,(For Pedal Steering) | 14 |
| 01***36 | Washer,Radio Controlled Slag Handling | 5 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Engine Hood And Guard(#1501-2200)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt - Rear Guard Mounting | 17 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Engine Hood And Guard(#2201-)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Equalizer Bar(#1501-2200)
| 01***35 | Bolt | 2 |
| 01***42 | Washer,Spring (For Pedal Steering) | 2 |
| 04***50 | Pin,Cotter (Except D40pll) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Equalizer Bar(#2201-)
| 01***35 | Bolt | 2 |
| 01***42 | Washer,Spring (For Pedal Steering) | 2 |
| 04***50 | Pin,Cotter (Except D40pll) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Fender And Rear Cover(#1501-2200)
| 01***25 | Bolt - Rear Guard Mounting | 2 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 20 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 20 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Fender And Rear Cover(#2201-)
| 01***25 | Bolt - Rear Guard Mounting | 2 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 26 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 6 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Floor Plate And Dashboard(#1501-2200)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 6 |
| 01***25 | Bolt - Rear Guard Mounting | 11 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Floor Plate And Dashboard(#2201-)
| 01***10 | Bolt, Mount Flasher | 4 |
| 01***20 | Bolt | 6 |
| 01***30 | Bolt,(For France Noise Suppression) | 6 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Frame And Cover(#1501-2200)
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 6 |
| 01***22 | Bolt | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Frame And Cover(#2201-)
| 01***12 | Bolt (M8-1.25x12) | 2 |
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***18 | Bolt | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Hitch
| 01***90 | Bolt (Kit) | 4 |
| 01***60 | Bolt (Ger) | 1 |
| 01***15 | Nut (Ger) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Mark And Plate(#1501-2200)
| 04***60 | Screw, Serial Number Plate | 4 |
| 09***35 | Plate? Name,Machine (Limited Supply) | 1 |
| 09***01 | Plate? Instruction,Radiator Level | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Mark And Plate(#2201-)
| 04***60 | Screw, Serial Number Plate | 4 |
| 09***35 | Plate? Name,Machine (Limited Supply) | 1 |
| 09***01 | Plate? Instruction,Radiator Level | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Operator'S Seat(#1501-2200)
| 01***30 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***75 | Bolt,(See Fig.0142) | 1 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Guard : Operator'S Seat(#2201-)
| 01***30 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 8 |
Main Clutch And Transmission
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Clutch And Brake Pedal(#1501-2200)
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 6 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 2 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Clutch Pedal(#2201-)
| 01***30 | Bolt,Radio Controlled Slag Handling | 3 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***12 | Screw | 3 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Counter Shaft And Gear
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Gear Shift Lever
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Gera Shift Fork
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Inertia Brake
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***05 | Nut? L.H. Thread,R.H. Thread | 1 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Intermediate Shaft And Gear
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Main Clutch Booster Pump And Steering Pump
| 04***18 | Ring, Snap | 1 |
| 07***60 | Seal,Oil | 1 |
| 70***01 | Pump Ass'Y,(Fal 020+020) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Main Clutch Booster(#1501-1558)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 7 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Main Clutch Booster(#1559-)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 7 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Main Clutch Case(#1501-2200)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 16 |
| 01***30 | Bolt,(For France Noise Suppression) | 17 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Main Clutch Case(#2201-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 13 |
| 01***30 | Bolt,(For France Noise Suppression) | 17 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Main Clutch Cover And Plate
| 01***16 | Bolt (Welded) | 6 |
| 01***45 | Bolt,(For Suction? Reversible Fan) | 12 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Main Clutch Shaft And Lever
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 3 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Main Shaft And Gear(#1501-2200)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 3 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Main Shaft And Gear(#2201-)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 3 |
| 01***40 | Bolt | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Transmission Case(#1501-2200)
| 01***30 | Bolt,(For France Noise Suppression) | 10 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 4 |
| 01***65 | Bolt,(For Suction Fan)(4d130-1d) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Transmission Case(#2201-)
| 01***30 | Bolt,(For France Noise Suppression) | 7 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Main Clutch And Transmission : Universal Joint
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 16 |
| 07***45 | Bolt,(Tree Pusher Dozer) | 16 |
| 12***10 | Universal Joint A | 1 |
Optional Parts
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Back-Up Alarm And Wiring(#2201-)
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***11 | Nut (Op) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Canopy
| 01***35 | Bolt,(For Pedal Steering) | 8 |
| 01***42 | Washer,Spring (For Pedal Steering) | 8 |
| 12***10 | Canopy Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Electrical System (For Rops Cab)
| 01***16 | Bolt (Welded) | 12 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 6 |
| 01***08 | Screw, Terminal | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Head Guard
| 01***75 | Bolt | 24 |
| 01***40 | Bolt,(For Center Guard) | 20 |
| 01***50 | Bolt, Radiator To Frame | 6 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Oil Bath Type Air Cleaner Mounting (Except Japan)(#2201-)
| 01***75 | Bolt,(For Adjusting) | 4 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 4 |
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Perforated Engine Side Cover (Except Japan)(#2201-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 6 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Radiator Dust Proof Grid
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 6 |
| 12***10 | Grid,Core | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Radiator Mask (For Cold Terrain Spec.) (Except Japan)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***16 | Screw,(Sandy And Dusty Terrain S.) | 4 |
| 01***10 | Washer,Spring (For Engine Room Lamp) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Rops Cab (1/3)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 16 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 18 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Rops Cab (2/3)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 20 |
| 01***08 | Screw, Terminal | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Rops Cab (3/3)
| 01***16 | Screw,(P.O.C. Model) (Except Japan) | 60 |
| 09***90 | Strip,Weather | 2 |
| 09***65 | Strip,Weather | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Rops Canopy
| 01***45 | Bolt,(For Slag Handling) | 14 |
| 01***50 | Bolt, Radiator To Frame | 12 |
| 01***75 | Bolt,Dust | 8 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Strengthened Lower Guard
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 5 |
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 14 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 5 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Swing Drawber
| 01***50 | Bolt, Fuel Tank Mounting - Front Left | 4 |
| 01***65 | Bolt, Tank Mounting - Front | 6 |
| 01***30 | Bolt,(For 187kg And 155kg) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Optional Parts : Tachometer(#2201-)
| 01***16 | Bolt,(For Slag Handling) | 6 |
| 01***20 | Bolt,(Used When Towing Winch) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 6 |
S4d105-1b S/N 18273-Up
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Air Cleaner
| 01***25 | Bolt - Rear Guard Mounting | 8 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 6 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 6 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Air Intake Manifold And Connection
| 01***65 | Bolt,(For Alternator Bracket Mount) | 6 |
| 01***75 | Bolt,(See Fig.0142) | 4 |
| 01***80 | Bolt,(See Fig.0131) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Alternator And Mounting
| 01***60 | Bolt,(Without Alternator Bracket) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Alternator(#100028-153564)
| 60***51 | Alternator A. (25a) | 1 |
| KD***52 | Bolt,Through | 3 |
| KD***70 | Rear Bracket Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Alternator(#153565-163823)
| 60***40 | Alternator A. (25a),(See Fig.0641) | 1 |
| KD***52 | Bolt,Through | 3 |
| KD***70 | Rear Bracket Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Alternator(#163824-)
| 60***30 | Alternator A. (25a),(With Non Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***70 | Bracket,Front | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Camshaft And Tappet
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
| 01***16 | Washer,(For Shipping) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Corrosion Resistor (Except Japan)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***29 | Washer,Spring (Cold Weather Spec.) | 4 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Crankshaft
| 61***11 | Bolt,Nylock (K2) | 1 |
| 61***00 | Metal Ass'Y | 1 |
| 61***50 | Thrust Metal Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Cylinder Block
| 01***20 | Bolt | 2 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Cylinder Block(#100028-149999)
| 01***20 | Bolt | 2 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Cylinder Head
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Cylinder Head Cover
| 01***16 | Bolt,(For Slag Handling) | 1 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 1 |
| 07***23 | Clamp - Hose | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Engine Support
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 8 |
| 01***55 | Bolt, Mount Lh Bracket | 8 |
| 20***20 | Bracket,Rear | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Exhaust Manifold And Turbocharger
| 01***60 | Bolt (M10-1.50x60) | 2 |
| 01***80 | Bolt, Mount Strainer Flange | 6 |
| 01***60 | Screw | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Flywheel And Flywheel Housing
| 01***40 | Bolt,(Dust And Dirt Protection) | 9 |
| 01***60 | Bolt, Trunnion Cap | 2 |
| 01***55 | Bolt | 6 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Front Cover
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 6 |
| 01***22 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***25 | Bolt,(Without Auto Priming System) | 5 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Fuel Filter
| 01***16 | Bolt (Welded) | 2 |
| 01***20 | Bolt | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Fuel Injection Pump (Feed Pump)
| DK***20 | Bolt, Joint | 1 |
| DK***20 | Pump,Priming | 1 |
| DK***00 | Spring,Piston | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Fuel Injection Pump (Governor) (1/2)
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Collar | 1 |
| DK***00 | Nut,Cap | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Fuel Injection Pump (Governor) (2/2)
| DK***00 | Adapter | 1 |
| DK***00 | Spring | 1 |
| DK***00 | Nut,Lock | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Fuel Injection Pump (Pump)
| 61***00 | Injection Pump Ass'Y | 1 |
| 61***00 | Injection Pump Ass'Y | 1 |
| DK***20 | Plunger Ass'Y | 4 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Fuel Injection Pump And Piping
| 01***20 | Bolt | 3 |
| 01***30 | Bolt | 1 |
| 01***35 | Bolt | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Fuel Injection Pump And Piping(#100028-103414)
| 01***30 | Bolt,(Cold Weather Spec.) | 1 |
| 01***55 | Bolt | 1 |
| 01***70 | Bolt | 3 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Gasket Kit
| 01***16 | Washer,Lock? Injection Gear | 1 |
| 07***65 | O-Ring,Injection Pump Case | 1 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Heater Signal And Relay Switch
| 60***70 | Switch,Air Intake Heater | 1 |
| 60***60 | Switch,Heater Relay | 1 |
| 60***71 | Signal,Signal | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Lubricating Oil Cooler
| 01***25 | Bolt,(Without Auto Priming System) | 5 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 9 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Lubricating Oil Filter
| 01***90 | Bolt | 1 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
| 01***25 | Bolt (M10x1.50x25) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Lubricating Oil Pump And Suction Pipe(#100028-149999)
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***50 | Bolt,(For Trimming Dozer) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Lubricating Oil Pump And Suction Pipe(#150007-)
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***40 | Bolt,(For Position Fixing) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Muffler
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***70 | Bolt, Spacer | 3 |
| 01***32 | Washer,(With Auto Emergency Steering) | 3 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Nozzle Holder
| 01***55 | Bolt,(For Trimming Dozer) | 8 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 8 |
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Oil Pan
| 01***22 | Bolt,(Cold Terrain Spec.) | 20 |
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Piston And Connecting Rod
| 04***18 | Ring, Retaining | 2 |
| 61***40 | Crank Pin Metal A | 4 |
| 61***00 | Connecting Rod Ass'Y | 4 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Power Take Off
| 01***30 | Bolt,(For France Noise Suppression) | 12 |
| 01***55 | Bolt, Mount Tube To Switch Pump | 12 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 12 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Rocker Arm
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Starting Motor (1/2) (7.5kw) (Except Japan)
| 60***81 | Starting Motor Ass'Y,7.5kw | 1 |
| KD***01 | O-Ring | 1 |
| KD***70 | Center Bracket A | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Starting Motor (1/2)(#102089-163823)
| 60***43 | Starting Motor A.,(5.5kw) (See Fig.0661) | 1 |
| KD***10 | Clutch Ass'Y,Over Running | 1 |
| KD***01 | O-Ring | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Starting Motor (1/2)(#163824-)
| 60***80 | Starting Motor Ass'Y,(5.5kw) | 1 |
| KD***30 | Bracket,Center | 1 |
| KD***50 | O-Ring | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Starting Motor (2/2) (7.5kw) (Except Japan)
| KD***01 | Washer,Seal | 2 |
| KD***30 | Holder | 1 |
| KD***05 | Terminal Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Starting Motor (2/2)(#102089-163823)
| KD***01 | Washer,Seal | 2 |
| KD***80 | Shift Lever Ass'Y | 1 |
| KD***30 | Contactor,Moving | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Starting Motor (2/2)(#163824-)
| KD***50 | O-Ring | 1 |
| KD***30 | Cap, Gum | 1 |
| KD***10 | Ring,Clip | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Starting Motor And Mounting
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Starting Motor(#100028-102088)
| 60***42 | Starting Motor A.,(5.5kw) (See Fig.2546) | 1 |
| KD***10 | Clutch Ass'Y,Over Running | 1 |
| KD***80 | Shift Lever Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Turbocharger (Except Japan)
| 61***00 | Turbocharger Ass'Y,(See Fig.2141) | 1 |
| 61***01 | Turbocharger Ass'Y,(See Fig.2141) | 1 |
| 61***02 | Turbocharger Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Turbocharger Lubricating Oil Piping
| 01***22 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Water Pump And Cooling Fan(#100028-149999)
| 01***18 | Bolt | 2 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Water Pump And Cooling Fan(#150007-)
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***50 | Bolt | 4 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-1b S/N 18273-Up : Water Separator
| 07***60 | O-Ring,(For Pc750?800?1800) (A2610) | 1 |
| 60***00 | Water Separator A.,(4d105-5h? 4d105-5t) | 1 |
| 60***60 | Plug,Drain (4d105-5h? 4d105-5t) | 1 |
S4d105-2b S/N 18273-Up
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Air Intake Connection (For Oil Bath Air Cleaner) (Sandy And Dusty Spec.)
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 9 |
| 01***45 | Bolt,(S6d155-4b) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Air Intake Connection And Air Cleaner
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 3 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Alternator (13a) (Dust And Drip Proof Type)(#.-)
| 60***71 | Alternator A. (13a),(With Hardening Pulley) | 1 |
| KD***31 | Bushing,Insulator | 2 |
| KD***80 | Packing | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Alternator (13a) (Dust And Drip Proof Type)(#49411-.)
| 60***70 | Alternator A. (13a) | 1 |
| KD***30 | Holder,Brush | 1 |
| KD***72 | Slip Ring Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Alternator (13a) (For Trimming Dozer)
| 60***60 | Alternator A. (13a),(With Non Hardening Pulley) | 1 |
| KD***30 | Holder,Brush | 1 |
| KD***50 | Pulley Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Alternator (25a)
| 60***50 | Alternator A. (25a) | 1 |
| KD***30 | Holder,Brush | 1 |
| KD***72 | Slip Ring Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Alternator (800w)
| 60***10 | Alternator Ass'Y | 1 |
| KD***37 | Bearing,Ball? Front | 1 |
| KD***47 | Bearing,Ball | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Alternator And Mounting
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 1 |
| 01***25 | Bolt | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Alternator And Mounting (800w)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***11 | Nut,(For Center Guard) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Camshaft And Tappet
| 01***18 | Bolt | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***65 | Bolt,(For Suction Fan)(4d130-1d) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Crankshaft
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 02***04 | Plug,(Not Shown) | 4 |
| 04***25 | Key | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Cylinder Block
| 01***30 | Bolt,Radio Controlled Slag Handling | 7 |
| 01***65 | Bolt | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 7 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Cylinder Head
| 01***16 | Bolt,(For Slag Handling) | 6 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 6 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Cylinder Head Cover
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***50 | Bolt,(For Trimming Dozer) | 8 |
| 01***55 | Bolt,(For Trimming Dozer) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Exhaust Manifold And Muffler
| 01***11 | Nut (M14-1.50 Thd), Nut; Was 01582-01411 | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 3 |
| 01***23 | Plain Washer | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Flywheel And Flywheel Housing
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 15 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 5 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 8 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Front Cover
| 01***45 | Bolt,(For Suction? Reversible Fan) | 7 |
| 01***75 | Bolt,(For D57sr) | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 9 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Fuel Filter And Mounting
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 6 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Fuel Injection Pump (Feed Pump)
| DK***20 | Housing | 1 |
| DK***10 | Feed Pump Ass'Y | 1 |
| DK***00 | Spring,Piston | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Fuel Injection Pump (Governor)
| DK***00 | Adapter | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Collar | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Fuel Injection Pump (Governor) (For Trimming Dozer)
| DK***80 | Shim? 0.5mm | 0 |
| DK***00 | Adapter | 1 |
| DK***20 | Lever | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Fuel Injection Pump (Pump)
| 61***10 | Injection Pump Ass'Y | 1 |
| 61***90 | Injection Pump Ass'Y,(For Trimming Dozer) | 1 |
| DK***30 | Bearing | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Fuel Injection Pump And Piping
| 01***25 | Bolt (M6-1.00x25) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***35 | Stud | 6 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Fuel Nozzle And Spill Pipie
| 01***65 | Bolt | 8 |
| 07***12 | Gasket,Mechanical Pump Piping | 6 |
| 07***37 | Clamp, Overflow Hose | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Gasket Kit
| 01***23 | Washer,Lock (K2) | 1 |
| 07***65 | O-Ring,Injection Pump Case | 1 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Intake Air Heater(#44579-59717)
| 01***16 | Bolt,(For Slag Handling) | 1 |
| 01***05 | Nut (Welded) | 2 |
| 01***19 | Washer,(Not Used With Ventilator) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Intake Air Heater(#59718-)
| 01***16 | Bolt (Welded) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***19 | Washer,(Not Used With Ventilator) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Lubricating Oil Filter And Oil Cooler
| 01***16 | Bolt,(For Slag Handling) | 8 |
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Lubricating Oil Pump
| 01***30 | Bolt,(For France Noise Suppression) | 8 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 8 |
| 01***16 | Washer,Radio Controlled Slag Handling | 8 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Lubricating Oil Strainer
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 5 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Oil Bath Air Cleaner (D45a? P) (Sandy And Dusty Spec.)
| 01***32 | Nut,Wing | 1 |
| 01***70 | Nut,Wing | 1 |
| 01***16 | Washer,Radio Controlled Slag Handling | 4 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Oil Pan
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 23 |
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Piston And Connecting Rod
| 61***14 | Bolt | 2 |
| 61***15 | Bolt,(Service Parts) | 2 |
| 61***22 | Nut,(Service Parts) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Resistor And Heater Signal(#44579-59717)
| 61***50 | Resistor | 1 |
| 61***21 | Signal,Heater | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Rocker Arm
| 01***12 | Bolt,(Without R.P.C.U.) | 1 |
| 01***80 | Bolt,(Shim 5 Pieces Over) | 4 |
| 01***19 | Washer,(Not Used With Ventilator) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Starting Motor
| 60***40 | Starting Motor Ass'Y,(Dust And Drip Proof Type) | 1 |
| 60***41 | Starting Motor Ass'Y,(See Fig.1545) | 1 |
| 60***42 | Starting Motor A.,(5.5kw) (See Fig.2546) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Starting Motor (For Trimming Dozer)
| 60***50 | Starting Motor Ass'Y | 1 |
| KD***10 | Clutch Ass'Y,Over Running | 1 |
| KD***80 | Shift Lever Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Starting Motor And Mounting
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
| 07***00 | O-Ring,(F4350-65a1 -5 ) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Tubrocharger (Except Japan)
| 61***00 | Turbocharger Ass'Y,(See Fig.1141) | 1 |
| 61***01 | Turbocharger Ass'Y,(See Fig.1141) | 1 |
| 61***02 | Turbocharger Ass'Y,(See Fig.1141) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Turbocharger Lubricating Oil Piping
| 01***22 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : S4d105-2b S/N 18273-Up : Water Pump And Cooling Fan
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***50 | Bolt,(For Trimming Dozer) | 1 |
Steering System And Final Drive
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Bevel Gear And Shaft
| 01***10 | Bolt, Mount Flasher | 4 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 6 |
| 01***20 | Bolt | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Brake Band
| 01***40 | Bolt,(Not Used With Cab) | 8 |
| 01***08 | Nut, Regular Hexagon (M10-1.50) | 2 |
| 01***42 | Washer,Spring (For Pedal Steering) | 8 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Brake Lock Lever(#2201-)
| 01***16 | Screw,(For Auto-Emergency Steering) | 1 |
| 01***08 | Washer,(For Mounting First Aid Kit) | 1 |
| 04***10 | Pin,Cotter (Without Towing Winch), Cotter Pin; Was 04050-11610 | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Brake Pedal(#2201-)
| 01***45 | Bolt,(Cold Terrain Spec.) | 3 |
| 01***12 | Screw | 1 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Final Drive Gear
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 24 |
| 01***20 | Bolt,(Used When Towing Winch) | 4 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 12 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Final Drive Housing
| 01***18 | Bolt (Op) | 20 |
| 01***30 | Bolt,(For Center Guard) | 8 |
| 01***40 | Bolt,(Not Used With Cab) | 50 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Sprocket And Shaft
| 01***25 | Bolt,(Without Auto Priming System) | 16 |
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 12 |
| 01***40 | Bolt,(Not Used With Cab) | 8 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Case And Main Frame
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
| 01***25 | Bolt,(For Slag Handling) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Case Cover (1/2)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 6 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Case Cover (2/2)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Clutch
| 01***10 | Nut (K10) | 2 |
| 04***30 | Ring,Snap? Sprocket | 2 |
| 06***15 | Bearing | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Control Lever(#1501-2200)
| 01***30 | Bolt,Radio Controlled Slag Handling | 7 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Control Linkage(#1501-2200)
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***07 | Nut,(For Slag Handling) | 4 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Control Linkage(#2201-)
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
| 01***10 | Nut,(Service Only) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Control Valve (1/2)
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 1 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Control Valve (2/2)
| 01***18 | Bolt | 5 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 5 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Cotrol Lever(#2201-)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt - Rear Guard Mounting | 2 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Filter
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
| 07***10 | O-Ring,(F4350-62a0 -5 ), O-Ring; Komatsu S/N 22***01 & Abv - Was 07000-02010, O-Ring; Was 07000-02010 | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Piping(#1501-2200)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Steering System And Final Drive : Steering Piping(#2201-)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 4 |
Tool And Kit
Komatsu : D40a-1(S/N 1501-Up) : Tool And Kit : Tool
| 07***00 | Pump,Grease | 1 |
| 07***00 | Pump,Grease | 1 |
| 07***00 | Cartridge,Grease | 1 |
Track
Komatsu : D40a-1(S/N 1501-Up) : Track : Carrier Roller
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***45 | Bolt,(For Slag Handling) | 8 |
Komatsu : D40a-1(S/N 1501-Up) : Track : Idler
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***40 | Bolt,(Not Used With Cab) | 8 |
| 01***13 | Nut - Cylinder Mounting | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Track : Recoil Spring
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 6 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 12 |
Komatsu : D40a-1(S/N 1501-Up) : Track : Track Frame
| 01***30 | Bolt,(For Center Guard) | 30 |
| 01***40 | Bolt,(Not Used With Cab) | 2 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Lower) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Track : Track Roller
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***55 | Bolt,(For Long Track) | 40 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 12 |
Komatsu : D40a-1(S/N 1501-Up) : Track : Track Shoe (Lubricate Type)(#3201-)
| 01***22 | Nut? Shoe (Kit) | 280 |
| 12***00 | Track Shoe Ass'Y | 1 |
| 12***10 | Track Shoe Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Track : Track Shoe (Master Pin Type)(#1501-3200)
| 01***22 | Nut? Shoe (Kit) | 296 |
| 12***10 | Track Link Ass'Y | 1 |
| 12***11 | Track Link Ass'Y | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Track : Track Shoe (Master Pin Type)(#3201-)
| 01***22 | Nut? Shoe (Kit) | 296 |
| 12***03 | Track Shoe Ass'Y | 1 |
| 12***03 | Track Shoe Ass'Y | 1 |
Work Equipment
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment : Angle Blade
| 01***42 | Washer,Spring (For Pedal Steering) | 1 |
| 02***60 | Bolt (Op) | 22 |
| 02***85 | Bolt | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment : C-Frame
| 01***55 | Bolt,(For France Noise Suppression) | 4 |
| 01***45 | Bolt, Fuel Tank Mounting - Front Right | 16 |
| 01***55 | Bolt, Strut Mounting - To Radiator And Rear Frame | 4 |
Work Equipment Control System
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Blade Control Lever(#1501-2200)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
| 01***06 | Nut? L.H. Thread,R.H. Thread | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Blade Control Lever(#2201-)
| 01***18 | Bolt (Op) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Blade Lift Cylinder
| 01***35 | Bolt,(Without Auto Priming System) | 4 |
| 01***45 | Bolt,(S6d155-4b) | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Hydraulic Control Valve (1/2)
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Hydraulic Control Valve (2/2)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 3 |
| 01***70 | Bolt, Spacer | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Hydraulic Filter And Piping
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Hydraulic Piping (Tank To Pump)
| 01***65 | Bolt,(For Suction Fan)(4d130-1d) | 4 |
| 01***75 | Bolt,(For D57sr) | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Hydraulic Piping (Valve To Lift Cylinder)
| 01***30 | Bolt,(Cold Terrain Spec.) | 8 |
| 01***35 | Bolt,(Without Auto Priming System) | 4 |
| 01***40 | Bolt,(For Position Fixing) | 4 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Hydraulic Pump(#1501-2200)
| 04***20 | Ring, Snap | 1 |
| 07***62 | Seal,Oil | 1 |
| 07***01 | Pump Ass'Y,(Par056-101) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Hydraulic Pump(#2201-)
| 04***18 | Ring,Snap (Itl) | 1 |
| 07***62 | Seal,Oil (Itl) | 1 |
| 70***00 | Pump Ass'Y,(Kar 056) | 1 |
Komatsu : D40a-1(S/N 1501-Up) : Work Equipment Control System : Hydraulic Tank
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 8 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 34 |
D40A-1(S/N 1501-UP) serial number reference
On the D40A-1, the PIN/serial plate is stamped on the front frame, right-hand side as viewed facing the direction of travel. Read it as a plain number (no letter prefix on this generation) and compare it to the 1501-UP starting point to confirm the unit falls in this model's range rather than an earlier or later series. The engine serial is stamped separately on the S4D105-3(B) block and normally differs from the chassis number, so record both and check them against dealer records when ordering parts, especially near the 1501-2200 sub-block where a components break occurred.
| Prefix | Identifies | Notes |
|---|---|---|
| 1501-UP | D40A-1 base machine (all units) | Komatsu documentation identifies this model by a plain numeric serial range starting at 1501, not a letter-prefixed PIN. Covers the D40A-1 crawler dozer (built roughly 1979 into the early 1980s), paired with the S4D105-3(B) 4-cylinder diesel; engine serials for this range start near 44579-up. No alpha PIN prefix scheme applies to this vintage machine; that scheme came later on Komatsu's product line. |
| 1501-2200 | D40A-1 early production sub-block (radiator cover/piping and electrical parts break) | A parts-catalog sub-range within 1501-UP marks a component break for radiator cover/piping and electrical-system parts, indicating a running production change inside the 1501-UP span. This sub-break is not independently confirmed; verify with your dealer before using it for parts ordering. |
Frequently asked questions
What engine powers the Komatsu D40A-1 (S/N 1501-UP)?
A Komatsu S4D105 naturally aspirated 4-cylinder diesel rated 59.7 kW (80 hp) at 2400 rpm, 3.98 L displacement. It has no ECM - a purely mechanical fuel system, consistent with this late-1970s production block.
What is the operating weight of the D40A-1 (S/N 1501-UP)?
Approximately 9,320 kg (20,547 lb) with the straight dozer blade fitted, which is the only blade configuration documented for this serial range.
What replaced the Komatsu D40A-1?
Komatsu continued the D40 line into later D40A-3 and D40A-5 generations, alongside the related D41A models, both built on updated engines and Komatsu's later alpha-prefix PIN serial scheme. These are distinct production runs from this S/N 1501-UP block, not a direct spec carryover.
What D40A-1(S/N 1501-UP) owners discuss
What kind of transmission and steering does the D40A-1 use, and how does it behave in the field?
This is a direct-drive machine, not a torque-converter powershift. Power runs through a mechanical gear transmission (4 forward, 3 reverse) to dry multi-disc steering clutches and external contracting brakes at each final drive. Turns come from releasing one steering clutch and applying its brake, not from hydrostatic steering. Compared to later powershift Komatsu dozers the feel is firmer and more mechanical, and the clutch linkage needs regular adjustment. A steering clutch that drags or slips shows up as the machine pulling to one side or a soft, delayed turn response - worn discs or a mis-adjusted linkage are the usual cause, not a hydraulic fault. Because steering and braking share the same clutch/brake pack on this machine, a dragging or slipping steering clutch is safety-relevant - have your dealer verify clutch and brake adjustment before returning the machine to service.
What undercarriage wear patterns show up most often on this class of machine?
As with any small-to-mid crawler dozer of this era, undercarriage condition drives a large share of lifetime operating cost. Loose track adjustment lets sag creep in and accelerates pin, bushing, and sprocket wear together. Rear drive sprockets with pointed tooth tips (rather than flat tips) are past usable life. Rollers should wear evenly side to side - uneven wear points to a bent frame rail or ongoing misalignment rather than normal use. Since this model spent most of its working life in grading and land-clearing duty, expect abrasive-material wear and packed mud in the belly pan trapping moisture against the frame and track components.
What are the known quirks of this engine series?
The engine is a naturally aspirated 4-cylinder diesel rated about 59.7 kW (80 hp) gross at 2400 rpm, with mechanical (jerk-pump style) fuel injection and no electronic controls. That simplicity is the main appeal for owners running this generation of machine: no ECM, no sensors to chase, and a fuel system that is straightforward to bleed and service by hand. In cold weather the engine needs a full glow-plug preheat cycle, typically 20 to 30 seconds, before cranking - skipping it brings hard starting, rough running, and white smoke until it warms up. With no turbo or intercooler, altitude and cold both cut available power more noticeably than on later turbocharged Komatsu engines, so budget extra preheat time and a slower warm-up in winter operation.
What electrical or starting problems come up on machines this age?
This machine predates onboard diagnostics, so "electrical issues" mean the charging and starting circuit, not sensors. The 24V system commonly develops no-crank or intermittent-crank complaints traced to worn starter brushes, a failing solenoid, or corrosion at the starter relay contacts rather than a bad starter itself. A poor ground - battery-to-frame, engine-to-frame strap, or the disconnect switch contacts - is a frequent root cause and easy to miss because the starter tests fine off the machine. Machines fitted with a starter safety/interlock relay can also fail to crank if the alternator diode leaks voltage back into the relay's sense circuit, fooling it into reading the engine as already running. Because a miswired or bypassed starter safety circuit can allow cranking with the transmission in gear, have your dealer verify the safety relay and interlock wiring after any starter or alternator replacement.
What hydraulic problems are common on the blade circuit?
The blade circuit is simple hydraulics - one pump feeding lift and tilt cylinders through a control valve, with no load-sensing or electronic control involved. The most common complaint is external leakage at the blade cylinder rod seals after decades of service; contamination getting past a leaking seal typically takes out the pump, not the other way around. Check cylinder rods for pitting before reseal, since a pitted rod cuts a fresh seal quickly. Slow or spongy blade response at working RPM usually points to a worn pump or internal valve leakage rather than an external seal problem.
Is rust a real concern on these machines, and where does it show up?
Since most surviving examples are decades old, cosmetic and structural rust is a routine finding rather than a defect unique to one machine. The usual spots are around the radiator surround, deck plating, and the belly pan and frame rail area, where packed mud holds moisture against the metal. Belly pan rust-through is common enough that owners treat it as a wear item rather than a red flag by itself. Rust reaching the frame rails or canopy/ROPS mounting points is a different matter and worth a closer structural inspection before buying or returning the machine to work.
What should I check before buying a used D40A-1?
Walk the undercarriage first: sprocket tooth condition (pointed tips mean worn out, flat tips mean usable), even roller wear, and track sag - undercarriage condition drives resale value on this class of machine as much as the engine does. Check the blade and push arms for punctures, tears, or heavy denting, which point to abusive use beyond the machine's size class. Look underneath for fresh oil at the cylinders, final drives, and engine or transmission case. Start it cold and confirm the glow-plug preheat works, then run it forward and reverse under light load, and spin it left and right both loaded and unloaded to confirm both steering clutches and brakes hold evenly. A pull to one side, delayed engagement, or grabby braking on one track is steering-clutch wear, not a minor adjustment - price it accordingly, and have your dealer verify the clutch and brake condition before purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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