Komatsubulldozersmall ( - d39)
Komatsu D21A-6(S/N 60001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu D21A-6 (S/N 60001-UP) is a compact crawler tractor designed for utility earthmoving. This machine belongs to the D-series and features a 4D95S engine providing 40 hp (29.8 kW) of gross power at 2450 rpm. The unit operates with an operating weight range of approximately 7,936.7 lb (3,600 kg) to 9,259 lb (4,200 kg), depending on configuration. It utilizes a hydrostatic transmission (HS) with two forward and two reverse gears. Standard configurations include a 7.2 ft (2.2 m) wide blade and specific track gauges for various terrain requirements.
The D21A-6 represents a specific generation within the D21 lineage, following earlier models like the D21A-3 and D21A-5. This series is characterized by its 4D95S engine displacement of 164.2 cu in (2,690.8 cc). In today's used equipment market, this machine remains a significant asset due to its compact footprint and the availability of robust Komatsu components. Its durability makes it a preferred choice for parts sourcing and secondary applications where maneuverability and low operating costs are prioritized over heavy production capacity.
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 D21A-6(S/N 60001-UP) specifications
Engine
| Engine Model | 4D9CS |
| Number of Cylinders | 4 |
| Gross Power | 40 hp (29.8 kW) |
| Power Measured @ RPM | 2450 rpm |
| Displacement | 164.2 cu in (2.7 L) |
| Aspiration | N.A. |
Weights
| Operating Weight | 7936.7 lb (3600 kg) to 9259 lb (4200 kg) varies by configuration |
Dimensions
| Length w/ Blade | 11.16 ft in (3400 mm) |
| Length w/o Blade | 8.37 ft in (2550 mm) |
| Width Over Tracks | 5.29 ft in (1610 mm) |
| Height To Top of Cab | 8.13 ft in (2475 mm) |
| Ground Clearance | 0.97 ft in (295 mm) to 0 ft (0 m) |
| Length of Track on Ground | 5.53 ft in (1685 mm) to 6.6 ft (2 m) |
Undercarriage
| Track Gauge | 4.3 ft in (1310 mm) to 1.0 m |
| Standard Shoe Size | 11.82 in (300 mm) to 12.0 in (30 cm) |
| Number of Shoes Per Side | 37 |
| Number of Track Rollers Per Side | 5 |
| Track Pitch | 5.32 in (135 mm) to 5.4 in (13.7 cm) |
Transmission
| Transmission Type | Hydrostatic (HS) |
| Number of Forward Gears | 2 |
| Number of Reverse Gears | 2 |
Blades
| Standard Blade Width | 7.2 ft in (2170 mm) to 6.6 ft (2 m) |
| Standard Blade Height | 23.3 in (590 mm) to 23.0 in (59 cm) |
| Blade Type | S/TS |
Service Capacities & Fluids
| Suitable Engine Oil | 10w/30, 15w/40 |
| Hydraulic Oil Type | Komatsu HO / CAT 10w |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D21A-6(S/N 60001-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine Crankcase (w/ filter) | 10W/30, 15W/40 engine oil per factory spec sheet | |
| Cooling System | ||
| Fuel Tank | ||
| Transmission/Powertrain (Powershift) | Check oil strainer; transmission pump provides steering and lubrication pressure | |
| Bevel Gear/Steering Compartments | ||
| Final Drives (each) | ||
| Hydraulic System/Tank | 10W/30, 15W/40 or CAT 10W hydraulic oil per factory spec sheet | |
| Pivot Shaft | ||
| Grease |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu D21A-6(S/N 60001-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 |
|
| Every 4,000 h |
|
Servicing the D21A-6(S/N 60001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize oil wear analysis at 500-hour intervals to monitor engine and hydraulic health. Regularly check transmission oil strainer cleanliness by removing the belly pan using a 22mm socket. Monitor steering circuit operating pressures, which vary between 27 kg/cm² (384 psi) for A/P/S/Q-6 configurations and 20 kg/cm² (284 psi) for E/P/B/S-6 series, to prevent hydraulic component failure.
Corrective & Common Repairs
Address steering clutch slippage or brake binding by inspecting the dry clutch system. If the machine fails to turn, check for clogged oil strainers on the transmission. For stuck components after long idle periods, apply gas and use the inching pedal to burn off rust from clutch disks. Ensure hydraulic pressure at the transmission remains near 225 PSI to prevent steering clutch release failure.
Overhaul & Rebuild Points
Plan major overhauls around the 2,000-hour mark, focusing on a full hydraulic oil change and coolant flush. During engine rebuilds, verify the 4D95S engine specifications and check turbocharger integrity. For undercarriage reconstruction, evaluate track pitch, roller wear, and shoe condition. Rebuilding the steering clutch assembly may require removing rear panels, seats, and batteries to access internal friction plates.
Seasonal & Environment Servicing
During cold weather operation, prioritize warming the engine and checking for frozen brake linkages or stiff hydraulic lines. In dusty environments, increase air filter inspection frequency to prevent clogging. For machines stored long-term, run the engine monthly and engage gears to prevent steering clutches from rusting together. Always verify that all fluid levels are correct before initiating heavy seasonal work.
D21A-6(S/N 60001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 09637-30161 | Plate? Instruction,Air Cleaner (Single Element) | Air intake service | Check fitment → |
| 07000-02135 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 07000-02080 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 6204-61-5190 | Gasket,Oil Cooler Element | Lubrication service | Check fitment → |
| 600-211-6240 | Cartridge,Engine Oil Filter (D31s) | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D21A-6(S/N 60001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| AA10NX | Air cleaner clogging | Accumulated dust or debris in the air filter element | Replace the air filter |
| E10 | Engine controller power malfunction | Faulty ECM power connections, blown fuses, or improper grounding | Inspect ECM power connections, fuses, or ground wires |
| E11 | Engine protection—output power reduced | High coolant temperature, low oil pressure, or restricted air intake | Check coolant temperature, oil pressure, and air filter |
| E15 | Engine sensors fault | Malfunction in temperature, fuel pressure, or oil pressure sensors | Inspect engine sensors and associated wiring |
| EOE | Network failure | Communication error within the machine's electronic network | Verify controller communication and wiring integrity |
| 989L00 | Engine controller lock warning (Mode 1) | Security or software lockout activation | Consult service manual for controller reset procedures |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
D21A-6(S/N 60001-UP) attachments & work tools
Blades
Standard blade width is 2.18 m (7.2 ft) with a height of 0.59 m (23 in). Power angle and power tilt configurations are available, utilizing hydraulic cylinders for angle and tilt functions.
Rippers
Ripper attachments are compatible with this model. Specific shank counts or weights for the D21A-6 are not documented in technical specifications.
Drawbars/counterweights
Specific drawbar or counterweight dimensions and weights for this serial range are not documented.
Cab/ROPS guarding options
Hydraulic components for work equipment include valves for 3-point hitch configurations. Specific forestry or waste guard packages are not detailed.
Hydraulic arrangement notes
Steering operating pressures vary by configuration: A, P, S, Q-6 and P-6A series spec at 27 kg/cm² (384 psi), while E-6, P-6B, and S-6A series spec at 20 kg/cm² (284 psi). Transmission pump pressure output should be approximately 225 PSI.
All D21A-6(S/N 60001-UP) assemblies by section
Every catalogued assembly group for the Komatsu D21A-6(S/N 60001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
4d95s-W-1g-A S/N 23318-Up
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Air Cleaner And Mounting
| 01***30 | Bolt,(Water Separator Spec.) | 1 |
| 01***16 | Bolt,(With Alternator Cover Type) | 2 |
| 01***06 | Nut | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Air Intake Manifold And Connection(#23318-30907)
| 01***65 | Stud | 1 |
| 01***65 | Bolt,(With Water Separator) | 3 |
| 01***75 | Bolt,(For Shipping) | 8 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Air Intake Manifold And Connection(#30908-)
| 01***65 | Stud | 1 |
| 01***12 | Bolt,(With Speedometer) | 4 |
| 01***65 | Bolt,(With Water Separator) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Alternator (15a)
| 60***60 | Alternator A. (15a) | 1 |
| KD***70 | Cover | 1 |
| KD***30 | Retainer | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Alternator (25a)
| 60***10 | Alternator A. (25a) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***11 | Rear Bracket Ass'Y | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Alternator And Mounting (15a)
| 01***25 | Bolt,(With Corrosion Resistor) | 1 |
| 01***45 | Bolt | 1 |
| 01***06 | Nut | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Alternator And Mounting (25a)
| 01***55 | Bolt,(With Engine Stop Motor Type) | 1 |
| 01***30 | Bolt | 1 |
| 01***11 | Nut,(For Center Guard) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Camshaft And Tappet
| 01***20 | Screw | 2 |
| 04***16 | Fitting Wedge | 1 |
| 62***31 | Thrust Washer | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Crankshaft
| 61***20 | Bolt | 1 |
| 62***00 | Crankshaft Ass'Y | 1 |
| 62***00 | Main Metal Ass'Y | 5 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Cylinder Block
| 01***55 | Bolt, Mount Tube To Switch Pump | 8 |
| 01***16 | Screw | 1 |
| 01***20 | Screw | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Cylinder Block (Cold Terrain Spec.)(#44033-)
| 01***55 | Bolt, Mount Tube To Switch Pump | 8 |
| 01***20 | Screw | 2 |
| 01***25 | Bolt,(With Corrosion Resistor) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Cylinder Head
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 17 |
| 02***04 | Plug, Pipe | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Cylinder Head Cover
| 61***10 | Cap, Oil Filler | 1 |
| 61***20 | Screw | 3 |
| 61***30 | Washer,(B) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Exhaust Manifold And Muffler
| 01***25 | Grub Screw | 4 |
| 01***45 | Bolt, Bracket Mounting | 8 |
| 01***11 | Nut (M14-1.50 Thd), Nut; Was 01582-01411 | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Exhaust Manifold And Muffler (Cold Terrain Spec.)(#44033-)
| 01***25 | Grub Screw | 4 |
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 01***45 | Bolt, Bracket Mounting | 6 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Exhaust Manifold And Muffler (With Spark Arrester)
| 01***25 | Grub Screw | 4 |
| 01***45 | Bolt, Bracket Mounting | 8 |
| 01***11 | Nut (M14-1.50 Thd), Nut; Was 01582-01411 | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Flywheel And Flywheel Housing
| 01***30 | Bolt | 6 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 11 |
| 01***45 | Bolt, Bracket Mounting | 8 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Front Cover And Gear
| 01***10 | Bolt | 1 |
| 01***70 | Bolt,(For 75a Alternator) | 1 |
| 01***16 | Bolt | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Fuel Filter And Piping
| 01***65 | Bolt,(With Water Separator) | 2 |
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Fuel Filter And Piping (For Large Capacity)(#56149-)
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Fuel Injection Pump (Feed Pump)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***20 | Pump,Priming | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Fuel Injection Pump (Governor) (1/2)
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***00 | Adapter | 1 |
| DK***80 | Nut | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Fuel Injection Pump (Governor) (2/2)
| DK***20 | Lever | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***20 | Capsule,Spring | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Fuel Injection Pump (Pump) (1/2)
| 62***10 | Injection Pump Ass'Y | 1 |
| 62***11 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing | 0 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Fuel Injection Pump (Pump) (2/2)
| DK***40 | Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-0040 | 0 |
| DK***90 | Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-0590 | 0 |
| DK***00 | Sleeve,Control | 4 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Fuel Injection Pump And Piping
| 01***35 | Stud | 4 |
| 01***12 | Bolt | 2 |
| 01***25 | Screw | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Fuel Nozzle And Spill Pipe
| 07***50 | Tube,Spill | 1 |
| 07***55 | Tube,Spill | 1 |
| 07***85 | Clip | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Gasket Kit
| 01***12 | Washer,Lock (Noise Suppression Spec.) (K2) | 1 |
| 07***65 | O-Ring,Injection Pump Case | 1 |
| 07***85 | O-Ring,(Without Fuel Level Gauge) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Gasket Kit (Cold Terrain Spec.)(#44033-)
| 01***12 | Washer,Lock (Noise Suppression Spec.) (K2) | 1 |
| 07***18 | O-Ring,(See Fig.1601-29?1602-17) | 1 |
| 07***20 | O-Ring,Relief Valve | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Lubricating Oil Filter
| 60***40 | Cartridge,Engine Oil Filter (D31s) | 1 |
| 60***41 | Cartridge,Engine Oil Filter (D31s) | 1 |
| 60***20 | Plate? Caution,(Italian-English) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Lubricating Oil Filter (Cold Terrain Spec.)(#44033-)
| 60***40 | Cartridge,Engine Oil Filter (D31s) | 1 |
| 60***50 | Plate? Caution,(Russian-English) | 1 |
| 62***10 | Nipple | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Lubricating Oil Pump And Suction Pipe
| 01***12 | Bolt,(See Fig.0501) | 1 |
| 01***16 | Screw | 6 |
| 01***55 | Bolt,(With Engine Stop Motor Type) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Oil Pan (Cold Terrain Spec.)(#44033-45419)
| 01***16 | Screw | 24 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
| 60***20 | Heater,Oil Pan | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Oil Pan (Cold Terrain Spec.)(#45420-)
| 01***16 | Bolt, Mount Solenoid Valve | 24 |
| 01***16 | Screw | 24 |
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Oil Pan (Double Bottom Type)(#36389-74638)
| 01***16 | Bolt, Mount Solenoid Valve | 24 |
| 01***16 | Screw | 24 |
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Oil Pan (Double Bottom Type)(#74639-)
| 01***20 | Bolt,(Forwarded Individually Parts) | 24 |
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 1 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Oil Pan (Extreme Cold Terrain Spec.)(#36390-)
| 01***16 | Bolt, Mount Solenoid Valve | 22 |
| 01***30 | Bolt,(Water Separator Spec.) | 2 |
| 01***16 | Bolt,(With Alternator Cover Type) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Oil Pan(#23318-74638)
| 01***16 | Bolt, Mount Solenoid Valve | 24 |
| 01***16 | Screw | 24 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Oil Pan(#74639-)
| 01***20 | Bolt,(Forwarded Individually Parts) | 24 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
| 62***12 | Pan,Oil | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Piston And Connecting Rod
| 04***12 | Ring, Snap | 8 |
| 62***40 | Piston (S) | 4 |
| 62***00 | Piston Ring Ass'Y,Per Cylinder | 4 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Rocker Arm
| 01***12 | Bolt,(Without R.P.C.U.) | 1 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 5 |
| 61***30 | Nut | 8 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Starting Motor (2.8kw)
| 60***70 | Starting Motor Ass'Y,(2.8kw) | 1 |
| KD***60 | Bracket,Center | 1 |
| KD***50 | Stopper,Piston | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Starting Motor And Mounting (2.8kw)
| 01***30 | Bolt | 2 |
| 07***95 | O-Ring,Transmission Strainer | 1 |
| (6***0) | Starting Motor Ass'Y,(2.8kw) (See Fig.A6210-B0b3) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Water Pump And Cooling Fan
| 01***16 | Screw | 5 |
| 01***20 | Screw | 2 |
| 01***25 | Bolt,(With Corrosion Resistor) | 6 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-A S/N 23318-Up : Water Separator And Piping(#43240-)
| 01***80 | Stud | 2 |
| 01***25 | Bolt,(With Corrosion Resistor) | 2 |
| 01***08 | Nut,See Fig. K4010-04a0 | 2 |
4d95s-W-1g-T S/N 23318-Up
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Air Cleaner And Mounting
| 01***30 | Bolt,(Water Separator Spec.) | 1 |
| 01***16 | Bolt,(With Alternator Cover Type) | 2 |
| 01***06 | Nut | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Air Intake Manifold And Connection(#23318-30907)
| 01***65 | Stud | 1 |
| 01***65 | Bolt,(With Water Separator) | 3 |
| 01***75 | Bolt,(For Shipping) | 8 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Air Intake Manifold And Connection(#30908-)
| 01***65 | Stud | 1 |
| 01***12 | Bolt,(With Speedometer) | 4 |
| 01***65 | Bolt,(With Water Separator) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Alternator (13a)
| 60***80 | Alternator A. (13a) | 1 |
| KD***31 | Bushing,Insulator | 2 |
| KD***80 | Packing | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Alternator And Mounting (13a)
| 01***35 | Bolt,(Cold Weather Spec.) | 1 |
| 01***55 | Screw | 1 |
| 01***11 | Nut,(For Center Guard) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Camshaft And Tappet
| 01***20 | Screw | 2 |
| 04***16 | Fitting Wedge | 1 |
| 62***31 | Thrust Washer | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Crankshaft
| 61***20 | Bolt | 1 |
| 62***00 | Crankshaft Ass'Y | 1 |
| 62***00 | Main Metal Ass'Y | 5 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Cylinder Block
| 01***55 | Bolt, Mount Tube To Switch Pump | 8 |
| 01***16 | Screw | 1 |
| 01***20 | Screw | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Cylinder Head
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 17 |
| 02***04 | Plug, Pipe | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Cylinder Head Cover
| 61***10 | Cap, Oil Filler | 1 |
| 61***20 | Screw | 3 |
| 61***30 | Washer,(B) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Exhaust Manifold And Muffler
| 01***25 | Grub Screw | 4 |
| 01***45 | Bolt, Bracket Mounting | 8 |
| 61***80 | Gasket,Exhaust Manifold | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Flywheel And Flywheel Housing
| 01***30 | Bolt | 6 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 11 |
| 01***45 | Bolt, Bracket Mounting | 8 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Front Cover And Gear
| 01***10 | Bolt | 1 |
| 01***70 | Bolt,(For 75a Alternator) | 1 |
| 01***20 | Bolt,(With Tachometer Outlet) | 8 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Fuel Filter And Piping
| 01***65 | Bolt,(With Water Separator) | 2 |
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Fuel Filter And Piping (For Large Capacity)(#56149-)
| 01***65 | Bolt,(With Water Separator) | 2 |
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Fuel Injection Pump (Feed Pump)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***20 | Pump,Priming | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Fuel Injection Pump (Governor) (1/2)
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***00 | Adapter | 1 |
| DK***80 | Nut | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Fuel Injection Pump (Governor) (2/2)
| DK***20 | Lever | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***20 | Capsule,Spring | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Fuel Injection Pump (Pump) (1/2)
| 62***30 | Injection Pump Ass'Y | 1 |
| 62***31 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing | 0 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Fuel Injection Pump (Pump) (2/2)
| DK***40 | Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-0040 | 0 |
| DK***90 | Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-0590 | 0 |
| DK***00 | Sleeve,Control | 4 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Fuel Injection Pump And Piping
| 01***35 | Stud | 4 |
| 01***12 | Bolt | 2 |
| 01***25 | Screw | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Fuel Nozzle And Spill Pipe
| 07***50 | Tube,Spill | 1 |
| 07***55 | Tube,Spill | 1 |
| 07***85 | Clip | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Gasket Kit
| 01***12 | Washer,Lock (Noise Suppression Spec.) (K2) | 1 |
| 07***65 | O-Ring,Injection Pump Case | 1 |
| 07***85 | O-Ring,(Without Fuel Level Gauge) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Lubricating Oil Cooler
| 01***25 | Bolt,(With Corrosion Resistor) | 4 |
| 01***30 | Bolt,(Water Separator Spec.) | 7 |
| 01***50 | Bolt,(With Corrosion Resistor) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Lubricating Oil Filter
| 01***25 | Bolt,(With Corrosion Resistor) | 4 |
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 1 |
| 60***40 | Cartridge,Engine Oil Filter (D31s) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Lubricating Oil Pump And Suction Pipe
| 01***12 | Bolt,(See Fig.0501) | 1 |
| 01***16 | Screw | 6 |
| 01***55 | Bolt,(With Engine Stop Motor Type) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Oil Pan
| 01***16 | Bolt, Mount Solenoid Valve | 22 |
| 01***16 | Screw | 22 |
| 01***30 | Bolt,(Water Separator Spec.) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Piston And Connecting Rod
| 04***12 | Ring, Snap | 8 |
| 62***40 | Piston (S) | 4 |
| 62***00 | Piston Ring Ass'Y,Per Cylinder | 4 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Rocker Arm
| 01***12 | Bolt,(Without R.P.C.U.) | 1 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 5 |
| 61***30 | Nut | 8 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Starting Motor (2.8kw)
| 60***40 | Starting Motor Ass'Y,(2.8kw) | 1 |
| KD***61 | Bracket,Center | 1 |
| KD***61 | Brush Holder A | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Starting Motor And Mounting (2.8kw)
| 01***30 | Bolt | 2 |
| 07***95 | O-Ring,Transmission Strainer | 1 |
| (6***0) | Starting Motor Ass'Y,(2.8kw) (See Fig.A6210-B0b3) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Water Pump And Cooling Fan
| 01***16 | Screw | 5 |
| 01***25 | Bolt - Relay Mounting | 2 |
| 01***20 | Screw | 2 |
Komatsu : D21a-6(S/N 60001-Up) : 4d95s-W-1g-T S/N 23318-Up : Water Separator And Piping(#43240-)
| 01***80 | Stud | 2 |
| 01***25 | Bolt,(With Corrosion Resistor) | 2 |
| 01***08 | Nut,See Fig. K4010-04a0 | 2 |
Control System
Komatsu : D21a-6(S/N 60001-Up) : Control System : Brake Pedal (For Lever Steering)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Brake Pedal Linkage
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 1 |
| 01***06 | Nut? L.H. Thread,L.H. Thread (For Chinese) | 2 |
| 01***06 | Nut,L.H. Thread (For Russian) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Fuel Control Lever (For F2-R2 Transmission)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***04 | Nut,(For Air Conditioner Less) | 1 |
| 01***13 | Washer,Spring(For Wiper Switch Earth) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Fuel Control Lever (For F3-R3 Transmission)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***04 | Nut,(For Air Conditioner Less) | 1 |
| 01***13 | Washer,Spring(For Wiper Switch Earth) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Inching Pedal (For F3-R3 Transmission)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 2 |
| 01***08 | Nut,(For Straight Tilt Dozer) (D65p) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Inching Pedal (For Lever Steering F2-R2 Transmission)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Inching Pedal (For Pedal Steering)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Inching Pedal Linkage (For F3-R3 Transmission)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
| 01***06 | Nut? L.H. Thread,L.H. Thread (For Chinese) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Oil Cooler Piping (For F2-R2 Transmission)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Oil Cooler Piping (For F3-R3 Transmission)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Parking Brake Lever (For Pedal Steering)
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 1 |
| 01***70 | Bolt,(With Wear Guard) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering And Brake Pedal (For Pedal Steering)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 4 |
| 01***08 | Nut,(For Straight Tilt Dozer) (D65p) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering Control Lever (For Lever Steering)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering Control Linkage (For Lever Steering) : Unit_02_of_02
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***32 | Screw | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering Control Linkage (For Lever Steering) : Unit_01_of_02
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***32 | Screw | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering Pedal Linkage (For Pedal Steering)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***32 | Screw | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering Piping
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***50 | Bolt (Kit) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering Piping (For F2-R2 Transmission)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***50 | Bolt (Kit) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering Piping (For F3-R3 Transmission)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***50 | Bolt (Kit) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering Valve (For Lever Steering)
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***70 | Bolt, Accumulator Mounting Bracket | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Steering Valve (For Pedal Steering)
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***70 | Bolt, Accumulator Mounting Bracket | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Transmission Control Lever (For F2-R2)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***09 | Nut,(With Body Positioner) | 1 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Transmission Control Lever (For F3-R3)
| 01***30 | Bolt,(For Mechanical Governor) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***05 | Nut,L.H. Thread (D31s) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Transmission Control Linkage (For F2-R2)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***09 | Nut,(With Body Positioner) | 1 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Control System : Transmission Control Linkage (For F3-R3)
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Engine Related Parts And Electrical System
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Back-Up Alarm
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***35 | Screw | 2 |
| 01***20 | Screw | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Battery
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
| 08***10 | Terminal? (+) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Battery (Dry Type)
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
| 08***10 | Terminal? (+) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Battery (Large Capacity Type)
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
| 08***10 | Terminal? (+) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Electrical System (For F2-R2 Transmission)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 10 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Electrical System (For F3-R3 Transmission)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Electrical System (With Rops Cab)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 9 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Engine Mounting Parts
| 01***10 | Bolt (Op) | 4 |
| 10***20 | Cushion | 4 |
| 10***30 | Cushion | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Fuel Tank Additional Strainer And Piping
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***50 | Bolt,(With Service Valve R.H.) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Fuel Tank And Piping (For F2-R2 Transmission)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Fuel Tank And Piping (For F3-R3 Transmission)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Fuel Tank And Piping (With Rops Cab)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Instrument Panel (For Lever Steering)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***08 | Screw, Terminal | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Instrument Panel (For Lever Steering) (Cold Weather (A) Spec.)
| 01***12 | Bolt,(With Cylinder Cover) | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Instrument Panel (For Lever Steering) (For Quick Heater)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***08 | Screw, Terminal | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Instrument Panel (For Lever Steering) (With Rops Cab)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***08 | Screw, Terminal | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Instrument Panel (For Lever Steering) (With Tachometer)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Instrument Panel (For Pedal Steering)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***08 | Screw, Terminal | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Instrument Panel (For Pedal Steering) (With Vandalism Protection)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***08 | Screw, Terminal | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Oil Pan Heater (Cold Weather (A) Spec.)
| 01***16 | Bolt (With Air Heater & Conditioner) | 1 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Quick Heater Glow Plug
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***12 | Screw,(With Articulate Indicator) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Radiator And Piping
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 7 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Radiator And Piping (Cold Weather And Sandy Dusty Spec.)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 7 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Radiator And Piping (For Large Capacity Radiator)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 7 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Engine Related Parts And Electrical System : Radiator Shutter
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***16 | Screw,(Sandy And Dusty Terrain S.) | 4 |
| 01***03 | Nut,(With Joy Stick Steering) | 4 |
Guard
Komatsu : D21a-6(S/N 60001-Up) : Guard : Canopy (Canvas)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 4 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 16 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Canopy(#60001-60938)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Canopy(#60939-67009)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 12 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Canopy(#67010-)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 12 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Cross Bar (For Angle Dozer)
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 8 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 16 |
| 01***45 | Bolt | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Cross Bar (For Power Angle Power Tilt Dozer)
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 8 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 16 |
| 01***45 | Bolt | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Head Guard
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 18 |
| 01***75 | Bolt | 24 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 18 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Loader Frame And Floor Plate (For Lever Steering) (For Angle Dozer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***55 | Bolt,(For Reinforced Type) | 12 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Loader Frame And Floor Plate (For Pedal Steering) (For Power Angle Power Tilt Dozer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Loader Frame And Floor Plate (Lever Steering) (Power Angle Power Tilt Dozer) (F2-R2 Transmission)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***55 | Bolt,(For Reinforced Type) | 12 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Loader Frame And Floor Plate (Lever Steering) (Power Angle Power Tilt Dozer) (F3-R3 Transmission)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***55 | Bolt,(For Reinforced Type) | 12 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Loader Frame And Floor Plate (With Rops Cab)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***55 | Bolt,(For Reinforced Type) | 12 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Operator'S Seat (Rigid Type) (For Lever Steering)
| 01***25 | Bolt,Without Revolution Sensor | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 10 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Operator'S Seat (Rigid Type) (For Pedal Steering)
| 01***25 | Bolt,Without Revolution Sensor | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 10 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Operator'S Seat (With Oil Damper)
| 01***25 | Bolt,Without Revolution Sensor | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 16 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Radiator Guard And Hood (For Angle Dozer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 11 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***50 | Bolt,(For Strengthened Cover) | 16 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Radiator Guard And Hood (For Power Angle Power Tilt Dozer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 11 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Radiator Guard And Hood (With Engine Side Cover) (For Power Angle Power Tilt Dozer)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 11 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rear Cover And Hydraulic Tank (With Rops Cab)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rear Cover And Hydraulic Tank(#60001-63878)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rear Cover And Hydraulic Tank(#63879-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***40 | Bolt,(With Service Valve R.H.) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Bracket
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 26 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Upper) | 8 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 34 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (1/5) (Body)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***16 | Screw,(Sandy And Dusty Terrain S.) | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (1/5) (Body) (Tbg Spec.)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (2/5) (Front And Rear Window)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (2/5) (Front And Rear Window) (Tbg Spec.)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (3/5) (Door And Side Window)
| 01***20 | Bolt,(Without Maintenance Monitor) | 4 |
| 01***45 | Bolt | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (3/5) (Door And Side Window) (Tbg Spec.)
| 01***20 | Bolt,(Without Maintenance Monitor) | 4 |
| 01***45 | Bolt | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (4/5) (Electrical System)
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (4/5) (Electrical System) (Tbg Spec.)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 8 |
| 01***12 | Screw,(Additional Sun Visor) | 1 |
| 01***20 | Screw - Turn Signal And Parkinglight Mounting | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (5/5) (Mounting Parts)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 9 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 9 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Cab (5/5) (Mounting Parts) (Tbg Spec.)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 9 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Rops Canopy
| 01***80 | Washer,(For R.H. Steering) | 4 |
| 10***10 | Guard,Rops Canopy | 1 |
| 10***10 | Pad,Rear | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Under Guard
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 12 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Under Guard (Reinforced Type)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 12 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Under Guard (With Front Hook)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 12 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Upper) | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Guard : Water Valve (For Car Heater)
| 07***59 | Clamp,See Fig. K4010-05a0 | 4 |
| 09***00 | Valve | 1 |
| 10***20 | Hose | 2 |
Main Clutch?Transmission? Steering And Final Drive
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Bevel Gear And Shaft
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 6 |
| 01***30 | Bolt | 10 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Brake
| 01***45 | Bolt, Mount Center Hinge Retainer (Upper) | 8 |
| 01***23 | Plain Washer | 2 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Damper
| 01***16 | Bolt (With Air Heater & Conditioner) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***75 | Bolt,(For Adjusting) | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Final Drive Case
| 01***30 | Bolt,(With Body Positioner) | 16 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Final Drive Gear
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 16 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 16 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Sprocket And Shaft
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***11 | Nut - Mounting | 24 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Steering Case And Main Frame (For Angle Dozer)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 11 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 11 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Steering Case And Main Frame (For Power Angle Power Tilt Dozer)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 11 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 11 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Steering Case Cover
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***50 | Bolt,(With Service Valve R.H.) | 18 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Steering Clutch (For F2-R2 Transmission)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 16 |
| 01***10 | Nut (K10) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 16 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Steering Clutch (For F3-R3 Transmission)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 16 |
| 01***10 | Nut (K10) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 16 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F2-R2) (1/6) (Case)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***35 | Bolt,(For Position Fixing) | 3 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 14 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F2-R2) (2/6) (Reverse Housing)
| 01***50 | Bolt,(With Service Valve R.H.) | 1 |
| 04***12 | Pin, Spring | 3 |
| 04***18 | Ring,Snap (With Emergency Steering) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F2-R2) (3/6) (Forward And 2nd Housing)
| 04***12 | Pin, Spring | 3 |
| 07***08 | Plug,(Without Lock-Up), Plug | 1 |
| 10***40 | Housing Ass'Y,Forward And 2nd | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F2-R2) (4/6) (1st Housing)
| 04***12 | Pin, Spring | 3 |
| 04***15 | Ring, Snap | 1 |
| 04***15 | Ring,Back-Up | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F2-R2) (5/6) (Transfer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***75 | Bolt, Tube Mounting | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F2-R2) (6/6) (Pump)
| 01***45 | Screw | 3 |
| 01***55 | Bolt,(10m) | 7 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F2-R2) (Modulation)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***60 | Bolt,(For Japan And Sweden) | 2 |
| 01***70 | Bolt (Op) | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F2-R2) (Selector And Inching)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***50 | Bolt (Kit) | 6 |
| 01***55 | Bolt,(10m) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (1/7) (Case)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***35 | Bolt,(For Position Fixing) | 1 |
| 01***45 | Screw | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (2/7) (Reverse Housing)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***12 | Washer,(F2320-63a2 -13 ) | 1 |
| 04***00 | Key | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (3/7) (Forward And 3rd Housing)
| 04***24 | Pin,Dowel (For No.3 Housing) | 2 |
| 10***20 | Gear | 1 |
| 10***20 | Gear | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (4/7) (2nd Housing)(#60001-64855)
| 04***15 | Ring,Back-Up | 1 |
| 04***20 | Ring, Snap | 1 |
| 06***07 | Bearing,Ball | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (4/7) (2nd Housing)(#64856-)
| 01***08 | Screw | 1 |
| 04***15 | Ring,Back-Up | 1 |
| 04***20 | Ring, Snap | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (5/7) (1st Housing)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (6/7) (Transfer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***75 | Bolt, Tube Mounting | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (7/7) (Pump)
| 01***45 | Screw | 3 |
| 01***55 | Bolt,(10m) | 7 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (Modulation)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***60 | Bolt,(For Japan And Sweden) | 3 |
| 01***70 | Bolt (Op) | 5 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Transmission (F3-R3) (Selector And Inching)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***50 | Bolt (Kit) | 5 |
| 01***65 | Bolt,R.H | 3 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Universal Joint (For F2-R2 Transmission)
| 01***40 | Bolt,(With Air Conditioner) | 8 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 8 |
| 07***75 | Fitting,Grease (Without Lub. Piping) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Main Clutch?Transmission? Steering And Final Drive : Universal Joint (For F3-R3 Transmission)
| 01***40 | Bolt,(With Air Conditioner) | 8 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 8 |
| 07***75 | Fitting,Grease (Without Lub. Piping) | 1 |
Mark Plate? Tool And Kit
Komatsu : D21a-6(S/N 60001-Up) : Mark Plate? Tool And Kit : Accessory Parts (Except Japan)
| 11***11 | Seat,Chassis | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Mark Plate? Tool And Kit : Marks And Plates (English)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,(Limited Supply) (English) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Mark Plate? Tool And Kit : Marks And Plates (German)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,(Limited Supply) (German) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Mark Plate? Tool And Kit : Marks And Plates (Spanish)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate? Safety,Inspection And Maintenance | 1 |
| 09***35 | Plate? Name,(Limited Supply) (Spanish) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Mark Plate? Tool And Kit : Spare Parts (Except Japan)
| 07***95 | O-Ring,Transmission Strainer | 1 |
| 07***28 | O-Ring,(For Hd325-6?Hm400-1) (A2110) | 2 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Mark Plate? Tool And Kit : Tool (Except Japan)
| 07***50 | Pump, (Bellows Type) | 1 |
| 07***03 | Cartridge - Grease | 1 |
| 07***45 | Nozzle, Grease Pump (Non-Flexible Type) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Mark Plate? Tool And Kit : Vandalism Protection
| 07***20 | Cap,(Lock Type) | 1 |
| 09***02 | Lock,(With Vandalism Protection) | 1 |
| 09***03 | Lock | 1 |
Track
Komatsu : D21a-6(S/N 60001-Up) : Track : Carrier Roller
| 01***25 | Bolt,(For Slag Handling) | 1 |
| 01***25 | Bolt,Without Revolution Sensor | 3 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Front Idler
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***08 | Nut,(For Straight Tilt Dozer) (D65p) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Recoil Spring (Reinforced Type)
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
| 01***35 | Bolt, Hydraulic Tank Mounting | 12 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Recoil Spring(#60001-62543)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 8 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Recoil Spring(#62544-)
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
| 01***35 | Bolt, Hydraulic Tank Mounting | 12 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Frame (With Mono Block Type Track Roller Guard) (For Power Angle Power Tilt Dozer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***25 | Bolt,(For Rubber Shoe) | 36 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 16 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Frame (With Separate Type Track Roller Guard) (For Angle Dozer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***25 | Bolt,(For Rubber Shoe) | 24 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 16 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Frame (With Separate Type Track Roller Guard) (For Power Angle Power Tilt Dozer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***25 | Bolt,(For Rubber Shoe) | 24 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 16 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Roller
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Upper) | 48 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 12 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Shoe (Lubricate Type) (Single Grouser With Hole)
| 01***18 | Nut? Shoe (Kit) | 304 |
| 07***22 | Plug,Large | 78 |
| 07***21 | Plug,(Small) | 78 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Shoe (Lubricate Type) (Single Grouser)
| 01***18 | Nut? Shoe (Kit) | 338 |
| 07***22 | Plug,Large | 74 |
| 07***21 | Plug,(Small) | 74 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Shoe (Lubricate Type) (Triple Grouser With Hole)
| 01***18 | Nut? Shoe (Kit) | 338 |
| 07***22 | Plug,Large | 74 |
| 07***21 | Plug,(Small) | 74 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Shoe (Master Pin Type) (Flat Type With Hole)
| 01***18 | Nut? Shoe (Kit) | 346 |
| 10***20 | Link,Track? L.H | 74 |
| 10***21 | Link,Track? L.H | 74 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Shoe (Master Pin Type) (Semi-Double Grouser With Hole)
| 01***18 | Nut? Shoe (Kit) | 362 |
| 10***21 | Link,Track? L.H | 78 |
| 10***31 | Link,Track? R.H | 78 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Shoe (Master Pin Type) (Single Grouser With Hole)
| 01***18 | Nut? Shoe (Kit) | 312 |
| 10***06 | Track Shoe Ass'Y | 1 |
| 10***07 | Track Shoe Ass'Y | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Shoe (Master Pin Type) (Single Grouser)
| 01***18 | Nut? Shoe (Kit) | 312 |
| 10***07 | Track Shoe Ass'Y | 1 |
| 10***08 | Track Shoe Ass'Y | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Shoe (Master Pin Type) (Snow Type With Hole)
| 01***18 | Nut? Shoe (Kit) | 346 |
| 10***20 | Link,Track? L.H | 74 |
| 10***21 | Link,Track? L.H | 74 |
Komatsu : D21a-6(S/N 60001-Up) : Track : Track Shoe (Master Pin Type) (Triple Grouser With Hole)
| 01***18 | Nut? Shoe (Kit) | 312 |
| 10***20 | Link,Track? L.H | 74 |
| 10***21 | Link,Track? L.H | 78 |
Work Equipment
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Angle Blade
| 01***45 | Washer | 2 |
| 02***40 | Bolt,(Pl) | 20 |
| 02***13 | Nut,(Pl) | 20 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Angle Cylinder (For Power Angle Power Tilt Dozer)
| 04***20 | Ring, Snap | 4 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
| 07***65 | O-Ring,(F5350-62a0 -14 ) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Angle Tilt Blade (For Power Angle Power Tilt Dozer)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 8 |
| 02***40 | Bolt,(Pl) | 18 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Angle Tilt Frame (For Power Angle Power Tilt Dozer)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 10 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***60 | Bolt, Mount Pole | 6 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : C-Frame
| 01***55 | Bolt,(10m) | 2 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Upper) | 12 |
| 01***15 | Bolt (Kit) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Dozer Lock (For Power Angle Power Tilt Dozer)
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 8 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 8 |
| 10***10 | Rope,Wire | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Hitch
| 01***40 | Bolt (Op) | 2 |
| 01***45 | Washer,(Without R.O.P.S.) | 2 |
| 10***12 | Drawbar | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Hydraulic Piping (Angle Cylinder Line) (Dozer Side) (For Power Angle Power Tilt Dozer)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 3 |
| 07***12 | O-Ring (Itl) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Hydraulic Piping (Tilt Cylinder Line) (Dozer Side) (For Power Angle Power Tilt Dozer)
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
| 01***35 | Bolt,(For Position Fixing) | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Hydraulic Piping Cover (For Power Angle Power Tilt Dozer)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Swing Drawbar
| 01***45 | Bolt (Op) | 10 |
| 01***45 | Washer,(Without R.O.P.S.) | 10 |
| 04***12 | Pin,Cotter (For Ripper) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment : Tilt Cylinder (For Power Angle Power Tilt Dozer)
| 01***18 | Bolt | 1 |
| 01***32 | Washer, (Without Emergency Steering) | 1 |
| 04***20 | Ring, Snap | 4 |
Work Equipment Control System
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Hydraulic Piping (Angle Cylinder Line) (Chassis Side)
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***09 | Nut,(With Body Positioner) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Hydraulic Piping (Lift Cylinder Line) (For Power Angle Power Tilt Dozer)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Hydraulic Piping (Lift Cylinder Line) (For Angle Dozer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Hydraulic Piping (Tank To Pump To Valve)
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Hydraulic Piping (Tilt Cylinder Line) (Chassis Side)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***09 | Nut,(With Body Positioner) | 4 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Hydraulic Tank And Filter (For Angle Dozer)
| 01***25 | Bolt,Without Revolution Sensor | 7 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt? Wing,Inspection Cover | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Hydraulic Tank And Filter (For Power Angle Power Tilt Dozer)
| 01***25 | Bolt,Without Revolution Sensor | 7 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt? Wing,Inspection Cover | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Lift Cylinder (For Angle Dozer)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***25 | Bolt | 1 |
| 01***09 | Nut (Itl) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Lift Cylinder (For Power Angle Power Tilt Dozer)
| 01***40 | Bolt, Mount Master Brake Cylinder | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Work Equipment Control Lever (1/2) (For Power Angle Power Tilt Dozer)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Work Equipment Control Lever (2/2) (For Power Angle Power Tilt Dozer)
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
| 01***05 | Nut,L.H. (For Trimming Dozer) | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Work Equipment Control Lever (For Angle Dozer)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Work Equipment Pump
| 04***15 | Ring, Snap | 1 |
| 70***10 | Seal, Oil | 1 |
| 70***70 | Plate | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Work Equipment Valve (1/2) (For Angle Dozer)
| 01***16 | Bolt (Op) | 4 |
| 01***25 | Bolt, Seal Cover Mounting | 2 |
| 01***30 | Bolt | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Work Equipment Valve (2/2) (For Angle Dozer)
| 01***08 | Nut (Op) | 1 |
| 07***11 | O-Ring (Kit) | 1 |
| 07***14 | O-Ring,(F4350-61a0a-20 ) | 1 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Work Equipment Valve (For Power Angle Power Tilt Dozer) (1/2)
| 01***16 | Bolt (Op) | 8 |
| 01***25 | Bolt, Seal Cover Mounting | 2 |
| 01***30 | Bolt | 2 |
Komatsu : D21a-6(S/N 60001-Up) : Work Equipment Control System : Work Equipment Valve (For Power Angle Power Tilt Dozer) (2/2)
| 01***08 | Nut (Op) | 1 |
| 07***11 | O-Ring (Kit) | 1 |
| 07***14 | O-Ring,(F4350-61a0a-20 ) | 1 |
D21A-6(S/N 60001-UP) serial number reference
The PIN plate is located on the front frame casting, typically on the operator's left side near the radiator support. On some models, it may also be stamped on the rear frame above the tow coupling. To read the prefix, identify the initial letters (e.g., 'D') which denote the machine family/type. Verify the serial number against the parts catalog to ensure the correct generation.
| Prefix | Identifies | Notes |
|---|---|---|
| D | D21A-6 | Identifies Crawler Dozer family. The numeric value indicates size/weight class. Suffix 'A' denotes Standard configuration. Serial range 60001-UP applies to this specific model generation. |
Frequently asked questions
What engine is installed in the D21A-6?
The machine is powered by a Komatsu 4D95S 4-cylinder engine with a displacement of 164.2 cu in (2,690.8 cc).
What is the operating weight of this model?
The operating weight is approximately 7,936.7 lb (3,600 kg), though some documentation indicates variations up to 9,259 lb (4,200 kg) depending on configuration.
What machine replaced the D21A-6?
The D21A-6 is part of a lineage that includes later generations such as the D2TR-7 series.
What D21A-6(S/N 60001-UP) owners discuss
What are the common causes of steering clutch failure or difficulty disengaging on the D21A-6?
Steering clutches often stick, slip, or fail to disengage due to rust or dry housings, especially after periods of inactivity. Water intrusion in wet clutch systems can also cause sticking and may plug hydraulic pump intake screens. Additionally, worn brake release linkages can prevent proper brake actuation.
How does the transmission system affect engine performance during gear engagement?
The D21A-6 transmission input shaft is directly coupled to the flywheel without a torque converter, which causes characteristic hard jerking when engaging gears. A modulating valve is utilized to mitigate this shock and improve power train durability.
What hydraulic pressure specifications should be checked for steering operation?
Steering operating pressure varies by configuration: for models D21A, P, S, Q-6 and P-6A, the spec is 27 kg/cm² (384 PSI). For models E-6, P-6B, and S-6A, the spec is 20 kg/cm² (284 PSI). Additionally, transmission pump output pressure should be approximately 225 PSI.
What are the typical engine specifications for the D21A-6 model?
The machine uses a Komatsu 4D95S engine. It is a 4-cylinder engine with a displacement of 164.2 cu in (2,690.8 cc), producing 40 hp (30 kW) at 2450 rpm.
What undercarriage components and measurements are standard for this machine?
The undercarriage features 3m shoes per side with a 5.32 in (13.7 cm) track pitch and a 3.3 ft (1 m) track gauge. Each side is equipped with 5 track rollers. The standard shoe size is approximately 11.82 in to 11.9 in (30 cm).
What should be inspected when purchasing a used D21A-6 to ensure it has been well-maintained?
Check for signs of water intrusion in the clutch housing and inspect the oil strainer for grit or debris, as clogged strainers reduce hydraulic pressure. Verify that the steering clutches and brakes do not stick due to rust from long-term storage. Inspect the blade movement; some units may only turn in one direction. Have your dealer verify the condition of the hydraulic slave cylinder if track slipping is present.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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