Komatsubulldozersmall ( - d39)
Komatsu D21P-3(S/N 20007-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu D21P-3 (S/N 20007-UP) is a compact crawler tractor designed for utility earthmoving, land clearing, and smoothing applications. This machine belongs to the small dozer class, featuring a gross power rating of 37 hp (27.6 kW) and an operating weight of approximately 6,970 lb (3,161.6 kg). It is equipped with a 4D92-1B engine series and utilizes a specialized undercarriage setup for low-impact work. The configuration typically includes a standard blade with a capacity of 1 yd³ (0.8 m³) and a track gauge of approximately 4.34 ft (1,320 mm).
As part of the D21 lineage, the P-3 series represents a specific generation characterized by its robust powertrain and specialized undercarriage for varying ground pressures. This model remains highly relevant in the used parts and equipment market due to the high availability of durable components and its suitability for light-duty tasks where larger machines are impractical. Maintenance focus on this series centers on the hydraulic steering system, engine cooling efficiency, and managing wear on the track rollers and shoes.
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 D21P-3(S/N 20007-UP) specifications
Engine
| Engine Model | 4D92-1B |
| Gross Power | 37 hp (27.6 kW) |
Weights
| Operating Weight | 6,970 lb (3,161.6 kg) |
Dimensions
| Ground Clearance | 1.24 ft (375 mm) |
| Length of Track on Ground | 5.5 ft (1,675 mm) |
| Track Gauge | 4.34 ft (1,320 mm) |
| Standard Shoe Size | 20.08 in (5/8 in) (510 mm) |
Undercarriage
| Ground Pressure | 2.7 psi (18.62 kPa) |
| Number of Track Rollers Per Side | 5 |
Blades
| Blade Width | 7.2 ft (2,180 mm) |
| Blade Height | 23.1 in (585 mm) |
| Blade Capacity | 0.75 m³ to 1 yd³ (varies by configuration/series) |
| Cutting Depth | 10.9 in (275 mm) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D21P-3(S/N 20007-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (w/ filter) | not documented for this exact serial range — verify with your dealer | not documented for this/this exact serial range — verify with your dealer |
| Cooling system | not documented for this exact serial range — verify with your dealer | not documented for this exact serial range — verify with your dealer |
| Fuel tank | not documented for this exact serial range — verify with your dealer | not documented for this exact serial range — verify with your dealer |
| Transmission/powertrain (powershift transmission + bevel gear/steering compartments) | not documented for this exact serial range — verify with your dealer | not enough data to specify—verify with your dealer |
| Final drives (each) | not documented for this exact serial range — verify with your dealer | not documented for this exact serial range — verify with your dealer |
| Hydraulic system/tank | not documented for this exact serial range — verify with your dealer | not documented for this exact serial range — verify with your dealer |
| Pivot shaft | not documented for this exact serial range — verify with your dealer | not documented for this exact serial range — verify with your dealer |
| Grease | not documented for this exact serial range — verify with your dealer | not documented for this exact serial range — verify with your dealer |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu D21P-3(S/N 20007-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the D21P-3(S/N 20007-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Regularly monitor engine oil and hydraulic fluid for particulate contamination. Utilize periodic sampling to detect early signs of engine or transmission wear. For the D21P-3, tracking changes in hydraulic oil viscosity can prevent pump cavitation. Ensure all fluids meet OEM specifications to maintain the integrity of the engine components and the hydrostatic/transmission systems.
Corrective & Common Repairs
Address steering clutch sticking or poor left-turn performance by inspecting the dry clutch assemblies. Monitor for hydraulic leaks at the blade cylinders or steering valves, which can lead to loss of precision. If engine power drops, inspect the fuel control lever and compression release mechanisms. Promptly replace worn track rollers or idlers to prevent excessive undercarriage strain.
Overhaul & Rebuild Points
Major overhaul intervals should focus on the 4D92-1B engine valve clearances and the transmission planetary gear sets. Inspect the final drive for gear wear and seal integrity. When rebuilding the undercarriage, evaluate the track shoes, pins, and bushings for significant elongation. Rebuilding the hydraulic pump assembly is critical if system pressure fails to meet factory specifications during testing.
Seasonal & Environment Servicing
In dusty environments, increase frequency of air cleaner inspections and radiator cleaning to prevent overheating. During cold-weather operations, ensure engine coolant concentrations are appropriate for freezing temperatures. For wet or muddy terrain, prioritize cleaning the undercarriage and track gauges to prevent debris buildup that accelerates wear on rollers and prevents proper track tensioning.
D21P-3(S/N 20007-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07000-02080 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 09655-00120 | Plate? Instruction,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 07000-02075 | O-Ring,Steering Oil Filter | Lubrication service | Check fitment → |
| 101-60-15171 | Element,Steering Oil Filter | Lubrication service | Check fitment → |
| 103-49-00010 | Oil Filter Ass'Y | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D21P-3(S/N 20007-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| High RPM / Misfire | Engine instability under load | Faulty fuel injectors or clogged air filters. | Inspect fuel injectors for leaks or poor spray patterns; check air filter cleanliness. |
| E10 | Engine controller power failure | ECM power connections, fuses, or ground wires. | Inspect ECM power connections, fuses, or ground wires. |
| E11 | Engine control failure (reduction of output power to protect the engine) | High coolant temperature, low oil pressure, or air filter restriction. | Check coolant temperature, oil pressure, and air filter. |
| AA10NX | Clogged air filter | Dust or debris accumulation in the air cleaner. | Replace the air filter. |
| B @ BCNS | Engine coolant overheating | Radiator fin blockage, fan belt failure, or low coolant level. | Check radiator fins, fan belt, and coolant level. |
| B @ BAZK | Oil level too low | Engine oil consumption or external leaks. | Check engine oil level and inspect for leaks. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
D21P-3(S/N 20007-UP) attachments & work tools
Blades
Standard blade width is 7.2 ft (2,180 mm) with a height of 23.1 in (585 mm). Capacity varies by configuration/series, ranging from 0.75 m³ to 1 yd³. Angle-tilt and reinforced options are available.
Rippers
Not explicitly documented for this exact serial range — verify with your dealer.
Winches
Not documented for this exact serial range — verify with your dealer.
Drawbars/counterweights
Not documented for this exact serial range — verify with your dealer.
Cab/ROPS guarding options
Aftermarket steel ROPS can replace fiberglass rain canopies. Head guards and canopy options are/are available as optional parts.
Hydraulic arrangement notes
Features a hydraulically-controlled, force-lubricated HYDROSHIFT transmission with planetary gears. System includes hydraulic cylinders and piping for blade functions.
All D21P-3(S/N 20007-UP) assemblies by section
Every catalogued assembly group for the Komatsu D21P-3(S/N 20007-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Damper And Transmission
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Damper And Case(#20017-30288)
| 01***16 | Bolt,(For Slag Handling) | 6 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***22 | Bolt,(Cold Terrain Spec.) | 6 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Damper And Case(#30289-)
| 01***16 | Bolt,(For Slag Handling) | 6 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 10 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Hydroshift Transmission Case And Gear (1/2)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 6 |
| 01***22 | Bolt,(Cold Terrain Spec.) | 8 |
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Hydroshift Transmission Case And Gear (2/2)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 6 |
| 01***22 | Bolt,(Cold Terrain Spec.) | 8 |
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Inching Pedal
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 3 |
| 01***45 | Bolt,(For Suction? Reversible Fan) | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Lubrication Valve
| 01***35 | Bolt | 2 |
| 10***10 | Transmission Ass'Y | 1 |
| 10***00 | Valve Ass'Y,Lubrication | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Oil Cooler And Piping
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Planetary Gear And Shaft (1/2)
| 01***45 | Bolt,(S6d155-4b) | 3 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 3 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 3 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Planetary Gear And Shaft (2/2)
| 01***45 | Bolt,(S6d155-4b) | 3 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 3 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 3 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Selector And Modulating Valve
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 9 |
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 2 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Shift Lever And Cover
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 5 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Transmission Pump
| 01***60 | Bolt (M10-1.50x60) | 4 |
| 01***08 | Nut,R.H. Thread | 8 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 8 |
Komatsu : D21p-3(S/N 20007-Up) : Damper And Transmission : Universal Joint
| 04***20 | Wire (Kit) | 6 |
| 10***00 | Universal Joint A | 1 |
| 10***01 | Universal Joint A | 1 |
Engine Related Parts And Electrical System
Komatsu : D21p-3(S/N 20007-Up) : Engine Related Parts And Electrical System : Battery
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 8 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 8 |
Komatsu : D21p-3(S/N 20007-Up) : Engine Related Parts And Electrical System : Compression Release Lever
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Engine Related Parts And Electrical System : Engine Attaching Parts
| 01***35 | Bolt,(For Pedal Steering) | 8 |
| 01***42 | Washer,Spring (For Pedal Steering) | 8 |
| 10***40 | Engine Ass'Y | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Engine Related Parts And Electrical System : Fuel Control Lever
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
Komatsu : D21p-3(S/N 20007-Up) : Engine Related Parts And Electrical System : Fuel Tank And Piping
| 01***25 | Bolt,(For Slag Handling) | 6 |
| 01***42 | Washer,Spring (For Pedal Steering) | 6 |
| 07***16 | Strainer,Fuel | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Engine Related Parts And Electrical System : Head Lamp And Wiring
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 01***30 | Screw | 2 |
| 01***10 | Washer,(Except Japan) | 2 |
Komatsu : D21p-3(S/N 20007-Up) : Engine Related Parts And Electrical System : Instrument Panel Regulator And Fuse Box
| 01***14 | Bolt | 4 |
| 01***16 | Bolt (Welded) | 3 |
| 01***16 | Bolt,(For Slag Handling) | 7 |
Komatsu : D21p-3(S/N 20007-Up) : Engine Related Parts And Electrical System : Radiator
| 01***10 | Bolt, Mount Flasher | 4 |
| 01***14 | Bolt | 4 |
| 01***16 | Bolt (Welded) | 13 |
Final Drive And Steering System
Komatsu : D21p-3(S/N 20007-Up) : Final Drive And Steering System : Bevel Gear And Shaft
| 01***30 | Bolt,Radio Controlled Slag Handling | 16 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 8 |
| 01***36 | Washer,Radio Controlled Slag Handling | 16 |
Komatsu : D21p-3(S/N 20007-Up) : Final Drive And Steering System : Brake
| 01***30 | Bolt,Radio Controlled Slag Handling | 8 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 4 |
| 01***06 | Nut? L.H. Thread,L.H. Thread | 2 |
Komatsu : D21p-3(S/N 20007-Up) : Final Drive And Steering System : Brake Pedal
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***45 | Bolt,(For Suction? Reversible Fan) | 2 |
| 01***08 | Bearing | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Final Drive And Steering System : Final Drive And Sprocket(#20017-30132)
| 01***22 | Bolt,(Cold Terrain Spec.) | 12 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Final Drive And Steering System : Final Drive And Sprocket(#30133-)
| 01***22 | Bolt,(Cold Terrain Spec.) | 12 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Final Drive And Steering System : Steering Case And Main Frame
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 4 |
| 01***20 | Bolt,(Used When Towing Winch) | 6 |
| 01***36 | Washer,Radio Controlled Slag Handling | 6 |
Komatsu : D21p-3(S/N 20007-Up) : Final Drive And Steering System : Steering Clutch
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 1 |
| 01***40 | Bolt | 1 |
| 01***10 | Nut,(For Slag Handling) | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Final Drive And Steering System : Steering Control Lever And Booster Spring
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 19 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
Optional Parts
Komatsu : D21p-3(S/N 20007-Up) : Optional Parts : Angle Blade
| 01***45 | Bolt,(Cold Terrain Spec.) | 8 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Lower) | 12 |
| 01***05 | Bolt | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Optional Parts : Canopy
| 01***25 | Bolt - Rear Guard Mounting | 8 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 4 |
| 01***10 | Nut,(Without Air Conditioner) | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Optional Parts : Head Guard
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 2 |
| 01***75 | Bolt,(For D65e) | 24 |
Komatsu : D21p-3(S/N 20007-Up) : Optional Parts : Mask? Reinforced Type
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
| 04***20 | Pin,Cotter (For Russian) | 4 |
Tool And Kit
Komatsu : D21p-3(S/N 20007-Up) : Tool And Kit : Service Kit
| 01***18 | Nut? Shoe (Kit) | 50 |
| 04***10 | Wire,Lock? Lever Set Bolt | 3 |
| 04***20 | Wire (Kit) | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Tool And Kit : Tool
| 07***00 | Nozzle, Grease Pump (Flexible Type) | 1 |
| 07***00 | Grease Pump Ass'Y | 1 |
| 09***06 | Wrench Set,8x10? 12x14? 13x17? | 1 |
Track And Guard
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Carrier Roller
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Engine Hood? Guard And Fender
| 01***16 | Bolt,(For Slag Handling) | 14 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 3 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 23 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Front Idler
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***30 | Bolt,(For France Noise Suppression) | 8 |
| 01***11 | Nut,(For Center Guard) | 2 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Hitch(#20017-30132)
| 01***35 | Bolt,(For Pedal Steering) | 4 |
| 01***42 | Washer,Spring (For Pedal Steering) | 4 |
| 04***12 | Pin,Cotter? Inertia Brake | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Hitch(#30133-)
| 01***35 | Bolt,(For Pedal Steering) | 4 |
| 01***42 | Washer,Spring (For Pedal Steering) | 4 |
| 04***40 | Pin,Cotter | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Mark And Caution Plate
| 04***60 | Screw, Serial Number Plate | 4 |
| 09***35 | Plate? Name,Machine (Limited Supply) | 1 |
| 09***00 | Plate? Instruction,Water Level | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Operator'S Seat(#20017-30132)
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 01***25 | Bolt,(Without Auto Priming System) | 8 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Operator'S Seat(#30133-)
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 7 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 6 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Recoil Spring(#20017-30429)
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 8 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Recoil Spring(#30430-)
| 01***16 | Bolt,(For Slag Handling) | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 8 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 8 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Rigid Bar
| 01***40 | Bolt,(Not Used With Cab) | 8 |
| 01***40 | Bolt,(For Center Guard) | 8 |
| 01***42 | Washer,Spring (For Pedal Steering) | 8 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Track Frame
| 01***35 | Bolt,(For Pedal Steering) | 16 |
| 01***45 | Bolt, Fuel Tank Mounting - Front Right | 20 |
| 01***42 | Washer,Spring (For Pedal Steering) | 16 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Track Roller
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Lower) | 40 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 12 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Track Roller Guard
| 01***25 | Bolt,(For Slag Handling) | 36 |
| 01***10 | Nut,(Dust?Drip Proof? Trimming S.) | 8 |
| 01***36 | Washer,Radio Controlled Slag Handling | 8 |
Komatsu : D21p-3(S/N 20007-Up) : Track And Guard : Track Shoe
| 01***18 | Nut? Shoe (Kit) | 296 |
| 10***12 | Track Link Ass'Y | 1 |
| 10***13 | Track Link Ass'Y | 1 |
Work Equipment And Its Control System
Komatsu : D21p-3(S/N 20007-Up) : Work Equipment And Its Control System : Blade
| 01***40 | Bolt,(Dust And Dirt Protection) | 8 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 16 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Lower) | 12 |
Komatsu : D21p-3(S/N 20007-Up) : Work Equipment And Its Control System : Control Valve
| 01***15 | Bolt | 2 |
| 01***75 | Bolt,(See Fig.0142) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
Komatsu : D21p-3(S/N 20007-Up) : Work Equipment And Its Control System : Hydraulic Cylinder
| 01***35 | Bolt,(Without Auto Priming System) | 4 |
| 01***45 | Bolt,(S6d155-4b) | 4 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Work Equipment And Its Control System : Hydraulic Filter
| 01***30 | Bolt,Radio Controlled Slag Handling | 3 |
| 01***45 | Bolt,(For Slag Handling) | 4 |
| 01***36 | Washer,Radio Controlled Slag Handling | 3 |
Komatsu : D21p-3(S/N 20007-Up) : Work Equipment And Its Control System : Hydraulic Piping (Control Valve To Cylinder)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***25 | Bolt - Rear Guard Mounting | 4 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Work Equipment And Its Control System : Hydraulic Piping (Tank To Pump To Filter To Control Valve)
| 01***35 | Bolt,(Without Auto Priming System) | 4 |
| 01***45 | Bolt,(S6d155-4b) | 8 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Work Equipment And Its Control System : Hydraulic Pump
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 8 |
| 04***18 | Ring, Snap | 1 |
| 07***60 | Seal,Bracket | 1 |
Komatsu : D21p-3(S/N 20007-Up) : Work Equipment And Its Control System : Hydraulic Pump Mounting
| 01***22 | Bolt,(Cold Terrain Spec.) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 4 |
Komatsu : D21p-3(S/N 20007-Up) : Work Equipment And Its Control System : Hydraulic Tank And Control Lever
| 01***18 | Bolt | 2 |
| 01***25 | Bolt,(Without Auto Priming System) | 1 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
D21P-3(S/N 20007-UP) serial number reference
The PIN plate is typically located on the front frame casting, often on the operator's left side. To read the prefix, identify the first three characters of the serial number sequence; these characters denote the machine family and model designation.
| Prefix | Identifies | Notes |
|---|---|---|
| D21P | D21P-3 (S/N 20007-UP) | Identifies the crawler dozer family and specific model series. This range includes configurations with a 4D92-1B engine and features a Hydroshift transmission with planetary gears, providing 2 forward and 2 reverse speeds. |
Frequently asked questions
What engine is installed in the Komatsu D21P-3 (S/N 20007-UP)?
This machine is equipped with a Komatsu 4D92-1B diesel engine providing 37 hp (27.6 kW) of gross power.
What is the operating weight of this model?
The operating weight for the D21P-3 is approximately 6,970 lb (3,161.6 kg).
What machine replaced the D21P-3?
Specific successor model designation is not documented in available technical literature; however, it belongs to a lineage of Komatsu D21 series crawler tractors.
What D21P-3(S/N 20007-UP) owners discuss
What engine is installed in the Komatsu D2/P-3 (S/N 20007-UP)?
The machine utilizes a 4D92-1B model engine, providing 37 hp (27.6 kW) of gross power.
What are the known steering and transmission behaviors for this series?
This unit features a HYDROSHIFT transmission with planetary gears that is hydraulically controlled and force-lubricates. Users have reported potential issues with dry steering clutches sticking on D21P models, unlike the wet clutch systems found in larger D31P units.
What are the typical undercarriage specifications for the D21P-3?
The undercarriage setup includes 5 track rollers per side, a track gauge of 4.34 ft (1,320 mm), and a standard shoe size of 20.08 in (510 mm). The machine maintains a ground pressure of 2.7 psi (18.62 kPa).
What maintenance tasks are critical for the engine and hydraulic systems?
Maintenance intervals range from 50 to 4,000 hours, requiring actions such as filter replacements, cooling system flues, and engine valve clearance adjustments. For certain Komatsu series, engine oil capacity is approximately 12.5 L (3.3 US gal) of 15w40 oil; however, users should use the dipstick to differentiate between drive motor fluid and hydraulic oil.
What mechanical difficulty is common when performing repairs on this model?
Replacing the starter can be difficult due to extremely cramped quarters, specifically regarding access to the bottom mounting bolt.
What should be checked when purchasing a used D21P-3 (S/N 20007-UP)?
Verify the serial number on the front frame casting against the machine plate to ensure no tampering has occurred. Additionally, if the machine was built after 2008, check for telematics enrollment and compare the dashboard hour meter against health reports to detect potential hour-meter rollbacks. Have your dealer verify all engine and transmission specifications.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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