Komatsubulldozermedium (d40 - d75)
Komatsu D41A-6(S/N B20001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu D41A-6 (S/N B20001-UP) is a mid-size crawler bulldozer designed for versatile earthmoving, grading, and site preparation. This generation features the Komatsu S6D102E-1 engine and utilizes a unique Hydroshift transmission, which integrates manual gear selection with smooth hydraulic drive efficiency. The machine belongs to the D-series family of crawlers, typically operating in the mid-weight class for utility applications.
The -6 series represents a specific generation within the D41 lineage, characterized by its pre-Tier 3 emissions configuration. This machine remains significant in the used parts and machinery market due to the high durability of its S6D102E-1 engine and the availability of specialized Hydroshift components. Maintenance of the hydraulic and powertrain systems is critical for preserving the resale value and operational uptime of these units.
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 D41A-6(S/N B20001-UP) specifications
Engine
| Engine Model | S6D102E-1 |
| Engine Type | S6D102E-1 |
| Number of Cylinders | 6 |
Weights
| Operating Weight | 9,220 kg (20,327 lb) |
Dimensions
| Front Blade Width | 3.04 m (9.99 ft) |
| Transport Width | 2.49 m (8.17 ft) |
| Transport Height | 2.88 m (9.47 ft) |
| Transport Length | 4.87 m (16 ft) |
| Track Width | 700 mm (27.6 in) |
Performance
| Travel Speed | 7.6 km/h (4.72 mph) |
| Soil Pressure | 0.24 kg/cm² |
Service Capacities
| Engine Speed at Max Torque | 2,400 rpm |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D41A-6(S/N B20001-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (w/ filter) | not documented for this exact serial range — verify with your dealer | Komatsu genuine diesel engine oil or equivalent meeting Komatsu Engineering Standard |
| Cooling system | 18 to 165 liters (4.75 to 43.59 gal) | Komatsu super coolant |
| Fuel tank | not documented for this exact serial range — verify with your dealer | not documented |
| Transmission/powertrain (powershift transmission + bevel gear/steering compartments) | not documented for this exact serial range — verify with your dealer | Komatsu powertrain oil |
| Final drives (each) | not documented for this exact serial range — verify with your dealer | Komatsu axle oil |
| Hydraulic system/tank | not documented for this exact serial range — verify with your dealer | Komatsu hydraulic oil |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu D41A-6(S/N B20001-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the D41A-6(S/N B20001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Monitor the S6D102E-1 engine oil and hydraulic fluids regularly. Use fluid analysis to detect early signs of metal shavings or contamination in the Hydroshift transmission. Check cooling system integrity to prevent overheating. Maintaining correct levels for engine oil, transmission fluid, and hydraulic oil is essential for preventing component failure across the powertrain.
Corrective & Common Repairs
Address common issues such as hydraulic leaks or power loss in the tracks. If one side stops pulling, inspect the brake system and transmission functionality. Monitor the engine for excessive smoke from the valve cover breather, which may indicate internal wear. Ensure all electrical sensors and solenoids are checked if fault codes appear on the dashboard monitor.
Overhaul & Rebuild Points
Major rebuilds should focus on the engine, Hydroshift transmission, and final drives. Inspect the undercarriage for track link wear and tension requirements. During overhaul, evaluate the main pump, steering pump, and hydraulic cylinders for fatigue. Replacing worn service kit components and checking the structural integrity of the main frame is vital during heavy-duty restoration.
Seasonal & Environment Servicing
In dusty environments, prioritize air filter cleaning and radiator inspections to prevent overheating. During cold operations, ensure hydraulic fluid viscosity is appropriate for the temperature. Check undercarriage tensioning and track link lubrication frequently when working in abrasive or muddy terrain. Protect the electrical system and battery from extreme moisture and corrosion.
D41A-6(S/N B20001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 113-60-43321 | Cartridge,Hydraulic Oil Filter (D31s) | Hydraulic service | Check fitment → |
| 6735-61-2150 | Gasket, Filter Head | Scheduled service item | Check fitment → |
| 600-181-6050 | Element Assembly, Complete | Scheduled service item | Check fitment → |
| 600-181-6540 | Element Assembly, Primary | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D41A-6(S/N B20001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E10 | Engine controller power failure; engine management system malfunction | Failure in engine controller power supply or management system error | Inspect engine controller power connections and electrical supply |
| E11 | Engine control failure (reduction of output power to protect the engine) | Detected malfunction in engine control system triggering derate mode | Check engine control system for faults and verify sensor integrity |
| E15 | Engine sensor malfunction (temperature, fuel pressure, oil pressure) | Faulty reading from temperature, fuel pressure, or oil pressure sensors | Test engine sensors for proper signal and check wiring harness |
| CA144 | Coolant temperature high temperature sensor feedback fault | Sensor feedback error related to coolant temperature monitoring | Inspect coolant temperature sensor and associated wiring circuit |
| CA153 | Intake air temperature sensor feedback voltage is too high | Electrical fault in the intake air temperature sensor circuit | Check intake air temperature sensor and wiring for shorts or high resistance |
| CA441 | Battery voltage too low | Insufficient electrical charge or battery failure | Check battery voltage levels and charging system performance |
| CA452 | Common Rail Pressure Sensor Feedback is too low | Low signal from the common rail pressure sensor | Inspect common rail pressure sensor and electrical connections |
| CA689 | Engine crankshaft speed sensor malfunction | Failure of the engine crankshaft speed sensor | Verify crankshaft speed sensor operation and wiring integrity |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
D41A-6(S/N B20001-UP) attachments & work tools
Blades
Blade for angle dozer is a listed work equipment part. Configuration includes blade lift cylinders.
Rippers
Custom multi-shank ripper assembly available with three shank pockets and one hydraulic cylinder. Assembly weight is approximately 1.10 metric tons (2,420 lbs) with a width of 1.95 meters (6.40 ft).
Drawbars/counterweights
Drawbar is identified as a standard part in the parts catalog for this serial range.
Cab/ROPS guarding options
Not documented for this exact serial range — verify with your dealer.
Hydraulic arrangement notes
Auxiliary hydraulic valve is required for ripper operations. Machine-specific valve and plumbing are not included in the ripper assembly.
All D41A-6(S/N B20001-UP) assemblies by section
Every catalogued assembly group for the Komatsu D41A-6(S/N B20001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
6d102-1-Z Engine S/N 30707205-Up
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Air Intake Connection And Exhaust Manifold
| 67***60 | Bolt, Mounting (M8x1.25x25) | 12 |
| 67***30 | Bolt, Mounting (M10x1.50x65) | 12 |
| 67***10 | Gasket,Exhaust Manifold | 6 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Alternator (40a) (Inner Parts)
| 20***10 | Cover | 1 |
| 20***20 | Bearing | 1 |
| 20***30 | Plate | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Alternator Mounting (40a)
| 12***60 | Brace | 1 |
| 12***80 | Fan | 1 |
| 12***30 | Pulley | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Camfollower Cover
| 67***20 | Hose | 1 |
| 67***20 | Bolt, Flange (M8-1.25x20) | 4 |
| 67***90 | Seal | 4 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Camshaft And Tappet
| 67***20 | Support, Camshaft Thrust | 1 |
| 67***60 | Bolt (M8x1.25x22) | 2 |
| 67***80 | Key, Plain Woodruff (4.0mm) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Crankshaft
| 67***30 | Metal | 1 |
| 67***50 | Gear, Crankshaft | 1 |
| 67***10 | Metal,Lower | 7 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Cylinder Block
| 67***10 | Plug, Pipe (1/2-14 Npt) | 1 |
| 67***30 | Plug, Pipe (1/8 Nptf) | 2 |
| 67***90 | Nozzle, Piston Cooling | 6 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Cylinder Head
| 67***10 | Bolt, Mounting (M12x1.75x70) | 6 |
| 67***20 | Bolt, Mounting (M12x1.75x120) | 14 |
| 67***10 | Plug, Pipe (1/2-14 Npt) | 5 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Damper
| 67***20 | Bolt (M12x1.25x36) | 4 |
| 67***10 | Damper | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Engine Hanger
| 67***20 | Bolt (M12x1.75x30) | 2 |
| 67***10 | Bracket, Lifting | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Fan Drive
| 67***70 | Bolt, Mounting (M8-1.25x40) | 4 |
| 67***20 | Support Ass'Y,Fan | 1 |
| 67***10 | Hub, Fan | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Flywheel Housing
| 67***20 | Plug, Pipe (3/4 Nptf) | 1 |
| 67***10 | Seal,Oil (K2) | 1 |
| 67***30 | Plate, Cover | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Front Cover
| 67***40 | Pin, Timing | 1 |
| 67***50 | Ring, Retaining | 1 |
| 67***60 | Screw, Round Head (M5-0.80x17) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Fuel Injection Piping And Spill Pipe
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 67***60 | Bolt, Mounting (M8x1.25x25) | 2 |
| 67***90 | Valve, Check (M8x1.25x17.5) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Fuel Injection Pump Mounting
| 67***10 | Nut, Hex Flange (M8-1.25) | 3 |
| 67***20 | Bolt, Flange (M8-1.25x20) | 3 |
| 67***30 | Stud | 3 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Fuel Shut Off Valve
| 67***10 | Solenoid,(For Bosch Injection Pump) | 1 |
| 67***10 | Solenoid,(For Cav Injection Pump) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Fuel Transfer Pump
| 12***70 | Tube | 1 |
| 67***60 | Bolt | 2 |
| 67***40 | Elbow | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Head Cover
| 67***30 | Bolt (M8x1.25x25) | 6 |
| 67***10 | Gasket, Valve Cover | 6 |
| 67***10 | Cover,Head | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Injection Nozzle
| 67***50 | Seal, Rectangular Ring | 1 |
| 67***30 | Seal, Banjo Connector (6.2 mm) | 1 |
| 67***00 | Injector,Kit | 6 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Kit
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
| 67***10 | Gasket,Exhaust Manifold | 6 |
| 67***20 | Seal, Rectangular Ring | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Oil Filler (Without Oil Filler)
| 67***60 | Plug, Expansion (Not Used With Side Oil Fill) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Oil Filter And Oil Cooler
| 67***30 | Plug, Pipe (1/8 Nptf) | 1 |
| 67***40 | Bolt, (M8x1.25x35) | 14 |
| 67***40 | Plug Ass'Y | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Oil Level Gauge
| 67***10 | Gauge,Oil | 1 |
| 67***20 | Stay | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Oil Pan
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Oil Pump
| 67***10 | Oil Pump Ass'Y | 1 |
| 67***20 | Bolt (M8x1.25x30) | 4 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Piston
| 67***00 | Rod, Engine Connecting | 6 |
| 67***10 | Rod | 1 |
| 67***30 | Bushing | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Rocker Arm
| 67***40 | Bolt | 6 |
| 67***10 | Rod, Push | 12 |
| 67***20 | Bracket | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Starting Motor Mounting (4.5kw)
| 67***10 | Gasket | 1 |
| 67***20 | Bolt, Mounting (M10x1.50x35) | 3 |
| 67***10 | Seal | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Tension Pulley
| 12***10 | Bracket | 1 |
| 67***60 | Bolt, Mounting (M8-1.25x25) | 1 |
| 67***10 | Tensioner, Belt | 1 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Thermostat And Thermostat Housing
| 67***10 | Thermostat | 1 |
| 67***40 | Bolt, (M8x1.25x35) | 1 |
| 67***50 | Bolt | 2 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Water Inlet Connection
| 67***10 | Plug, Pipe (1/2-14 Npt) | 1 |
| 67***20 | Plug, Pipe (3/4 Nptf) | 1 |
| 67***20 | Bolt (M10-1.50x75) | 3 |
Komatsu : D41a-6(S/N B20001-Up) : 6d102-1-Z Engine S/N 30707205-Up : Water Pump
| 67***60 | Bolt (M8x1.25x22) | 2 |
| 67***00 | Pump,Water | 1 |
| 67***00 | Water Pump Ass'Y | 1 |
Accessory
Komatsu : D41a-6(S/N B20001-Up) : Accessory : Spare Parts
| 09***00 | Box,Spare Parts (Except Usa) | 1 |
| 11***21 | Cartridge,Hydraulic Oil Filter (D31s) | 1 |
| 23***20 | Cartridge | 1 |
Cooling System
Komatsu : D41a-6(S/N B20001-Up) : Cooling System : Cooling (With Sandy Dusty Protection Grid)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
Komatsu : D41a-6(S/N B20001-Up) : Cooling System : Cooling (Without Air Conditioner)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 7 |
Electrical System
Komatsu : D41a-6(S/N B20001-Up) : Electrical System : Battery
| 08***00 | Terminal? (+),(10l) (Not Shown) | 2 |
| 08***01 | Terminal? (-),(20l) (Not Shown) | 2 |
| 12***10 | Battery (65d26r) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Electrical System : Battery Wiring(#B20001-B20500)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 5 |
Komatsu : D41a-6(S/N B20001-Up) : Electrical System : Battery Wiring(#B20501-)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 5 |
Komatsu : D41a-6(S/N B20001-Up) : Electrical System : Vehicle Lamp
| 01***16 | Bolt - Seat And Tether Belt Mounting | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Electrical System : Vehicle Wiring
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 22 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 22 |
Engine Related Parts
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Air Cleaner(#B20001-B20500)
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Air Cleaner(#B20501-)
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***45 | Bolt,(With Water Separator Type) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Cooling Fan (Blower Type)
| 01***40 | Bolt (Op) | 4 |
| 01***30 | Screw | 6 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Damper
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 12 |
| 01***45 | Bolt,(With Water Separator Type) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Engine Mount
| 01***20 | Bolt | 4 |
| 11***20 | Washer | 8 |
| 12***50 | Cushion | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Engine Wiring
| 01***75 | Capscrew | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 7 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Flywheel
| 12***50 | Flywheel Ass'Y | 1 |
| 12***51 | Flywheel Ass'Y | 1 |
| 67***20 | Washer, Plain (M12) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Fuel Filter
| 01***35 | Bolt,(For Fix Position) | 2 |
| 01***35 | Bolt, Cover | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Mount Bracket
| 01***40 | Bolt,For Weight Adjusting Bolt | 14 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 14 |
| 12***11 | Bracket,Front? L.H | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Muffler(#B20001-B20500)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***30 | Bolt,(With Body Positioner) | 14 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Muffler(#B20501-)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt,(With Body Positioner) | 14 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Oil Filler
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 07***09 | Clamp,(See Fig. K0210-16a0) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Oil Filter
| 67***40 | Cartridge,Oil | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Pressure Switch
| 08***05 | Switch,Engine Oil Pressure | 1 |
| 28***50 | Nipple | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Starting Motor (4.5kw)
| (6***0) | Starting Motor Ass'Y,(4.5kw) (See Fig.A621p-02a2) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Starting Motor (4.5kw) (Inner Parts)
| 60***10 | Starting Motor Ass'Y,(4.5kw) | 1 |
| ND***00 | Washer, Felt | 1 |
| ND***50 | Bushing,Drain | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Starting Motor Switch
| 01***16 | Bolt - Seat And Tether Belt Mounting | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Engine Related Parts : Water Temperature Sensor (With Monitor Panel)
| 08***10 | Connector, Clip | 1 |
| 56***12 | Adapter,Water Temperature Gauge | 1 |
| 78***20 | Sensor, Trans. Control Valve Oil Temperature | 1 |
Fuel Tank And Related Parts
Komatsu : D41a-6(S/N B20001-Up) : Fuel Tank And Related Parts : Additional Fuel Strainer
| 01***25 | Bolt,(Rear Attachment Less) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Fuel Tank And Related Parts : Fuel Line
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 7 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 7 |
| 04***12 | Clip | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Fuel Tank And Related Parts : Fuel Tank (For Monitor Panel)
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***80 | Screw | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Guard
Komatsu : D41a-6(S/N B20001-Up) : Guard : Front Guard (Engine Hood Mount)(#B20001-B20500)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 12 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Front Guard (Engine Hood Mount)(#B20501-)
| 01***30 | Bolt,(Not Used When Towing Winch) | 6 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 4 |
| 01***55 | Bolt - Mount Cage To Transmission Case | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Front Guard (Engine Hood) (Without Cab)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
| 12***62 | Pipe | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Front Guard (Engine Side Cover? Lower)
| 01***20 | Bolt,(Without Air Con. Or Heater) | 8 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 7 |
| 01***23 | Washer,(With Auto Emergency Steering) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Front Guard (Engine Side Cover? Upper)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 16 |
| 01***12 | Washer,(With Body Positioner) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 16 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Radiator Guard(#B20001-B20500)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 13 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 4 |
| 01***55 | Bolt,(For Reinforced Type) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Radiator Guard(#B20501-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 4 |
| 01***55 | Bolt,(For Reinforced Type) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Radiator Mask
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 12 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
| 12***21 | Cover | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Radiator Mask (Reinforced)
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 8 |
| 01***60 | Bolt, Tube To Oil Cooler | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Cover
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Guard (Battery Cover)
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***16 | Washer,(With Water Separator) | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Guard (Bracket) (Except Rops)(#B20001-B20500)
| 01***70 | Bolt | 16 |
| 01***60 | Flat Washer - M20 (Hardened) | 16 |
| 07***20 | Plug,(For Without Center Guard) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Guard (Bracket)(#B20501-)
| 01***70 | Bolt | 16 |
| 01***60 | Flat Washer - M20 (Hardened) | 16 |
| 07***25 | Plug,(For Shipping And Storage Only | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Guard (Fender)(#B20001-B20500)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 22 |
| 01***50 | Bolt,(For Large Size Tire) | 8 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 22 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Guard (Fender)(#B20501-)
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 16 |
| 01***50 | Bolt,(For Large Size Tire) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Guard (Filter Cover)
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Guard (Handie And Plug) (Except Rops)
| 01***30 | Bolt,(Not Used When Towing Winch) | 6 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Guard (Tool Box And Battery Plate)(#B20001-B20500)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 15 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 10 |
| 01***25 | Bolt | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Rear Guard (Tool Box And Battery Plate)(#B20501-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 15 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 9 |
| 01***25 | Bolt | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Under Guard
| 01***35 | Bolt,(With Rops) | 4 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 4 |
| 12***41 | Cover | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Guard : Under Guard (With Front Fook)
| 01***40 | Bolt,(For Slag Handling) (For Usa) | 8 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 8 |
| 12***11 | Hook | 1 |
Hydraulic System
Komatsu : D41a-6(S/N B20001-Up) : Hydraulic System : Control Valve (Mount)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Hydraulic System : Hydraulic Pump Line
| 01***30 | Bolt,(With Body Positioner) | 3 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 5 |
Komatsu : D41a-6(S/N B20001-Up) : Hydraulic System : Hydraulic Tank
| 01***45 | Bolt,(For 60ton Dump Body) | 4 |
| 01***14 | Screw | 6 |
| 01***13 | Washer,Spring(For Wiper Switch Earth) | 6 |
Komatsu : D41a-6(S/N B20001-Up) : Hydraulic System : Lift Cylinder Line
| 01***50 | Capscrew | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
Main Frame And Related Parts
Komatsu : D41a-6(S/N B20001-Up) : Main Frame And Related Parts : Main Frame
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 14 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 11 |
| 01***35 | Bolt,(With Rops) | 4 |
Marks And Plates
Komatsu : D41a-6(S/N B20001-Up) : Marks And Plates : Marks And Plates (Portuguese)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***50 | Plate? Name,(Limited Supply) | 1 |
| 09***63 | Plate? Instruction,Air Cleaner Instruction | 1 |
Operator'S Compartment And Control System
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Arm Rest Cover (Lower) (Without Cab)(#B20001-B20500)
| 01***25 | Bolt,(Rear Attachment Less) | 4 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Arm Rest Cover (Lower) (Without Cab)(#B20501-)
| 01***25 | Bolt,(Rear Attachment Less) | 4 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Arm Rest Cover (Upper)
| 01***12 | Bolt - M8 - 1.25 X 12 | 8 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***14 | Bolt,(Without Cab) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Arm Rest Cover (Upper) (With Rear Attachment)
| 01***12 | Bolt - M8 - 1.25 X 12 | 8 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***14 | Bolt,(Without Cab) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Blade Control System
| 01***30 | Bolt - M8 X 30lg | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
| 01***23 | Washer,(For Shipping) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Canopy
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 8 |
| 01***50 | Bolt,(For D60pl) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Dash Board (Without Cab) (With Monitor Panel)
| 01***10 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***12 | Bolt - Front Cover Mounting | 1 |
| 01***16 | Bolt - Box Mounting | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor (Brake And Inching Pedal)
| 01***45 | Bolt, Mounting Cranking Motor | 2 |
| 01***08 | Nut,L.H. Thread | 2 |
| 01***10 | Nut,(Without Air Conditioner) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor (Decelerator Pedal)
| 01***30 | Bolt - M8 X 30lg | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
| 01***30 | Bolt,Stopper | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor (Floor Mount) (With Decelerator Pedal)
| 01***30 | Bolt,(Not Used When Towing Winch) | 17 |
| 01***25 | Bolt | 17 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor (Floor) (With Decelerator Pedal)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***25 | Bolt | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Blade Control) (For Angle Dozer)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 4 |
| 01***30 | Bolt - M8 X 30lg | 1 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Blade Lock) (For Angle Dozer)
| 01***25 | Bolt,(Rear Attachment Less) | 2 |
| 01***30 | Bolt - M8 X 30lg | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Electrical Equipment)(#B20001-B20500)
| 01***25 | Bolt,(Rear Attachment Less) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 3 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Electrical Equipment)(#B20501-)
| 01***25 | Bolt,(Rear Attachment Less) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***30 | Bolt,(With Body Positioner) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Frame And Mount)(#B20001-B20500)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***15 | Bolt | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Frame And Mount)(#B20501-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***15 | Bolt | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Fuel Control)
| 01***30 | Bolt - M8 X 30lg | 1 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 1 |
| 01***40 | Bolt (Op) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Handle) (Without Cab)
| 01***25 | Bolt | 4 |
| 07***15 | Plug,(For Rops Sweep) (Without Cab) | 15 |
| 09***14 | Cap,(Not Used For Komtrax Spec.) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Steering Control Mount)
| 01***30 | Bolt - M8 X 30lg | 5 |
| 01***35 | Bolt,(For Fix Position) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 9 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Steering Control) (1/2)
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Steering Control) (2/2)
| 01***30 | Bolt - M8 X 30lg | 2 |
| 01***45 | Bolt, Mounting Cranking Motor | 1 |
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Steering Valve Piping)
| 07***23 | O-Ring,(Crusher?Other Att.For Ppc Con | 4 |
| 07***23 | O-Ring,(F4350-61a1b-29 ) | 2 |
| 11***80 | Joint | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Transmission Lock)
| 01***30 | Bolt - M8 X 30lg | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Frame (Wiring)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 13 |
| 01***20 | Bolt,(For Mono Lever Steering) | 7 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Suspention (Rigid Mount) (Without Cab)(#B20001-B20500)
| 01***30 | Bolt,(Not Used When Towing Winch) | 6 |
| 01***45 | Bolt, Mounting Cranking Motor | 6 |
| 01***45 | Bolt,(For 60ton Dump Body) | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Floor Suspention (Rigid Mount) (Without Cab)(#B20501-)
| 01***20 | Bolt,(For Mono Lever Steering) | 8 |
| 01***75 | Capscrew | 8 |
| 01***80 | Bolt | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Monitor Panel
| 78***10 | Bulb - 1.4 Watt | 5 |
| 78***00 | Monitor Panel Ass'Y | 1 |
| 78***00 | Plate | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Non Slip Sheet (Without Cab)
| 14***40 | Sheet | 1 |
| 14***50 | Sheet | 1 |
| 14***60 | Sheet | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Operator'S Seat (Reclining Type) (Leather Seat) (Kab)(#B20061-)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Operator'S Seat (Reclining Type) (Leather Seat) (Tatiesu)(#B20001-B20060)
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 12 |
| 01***10 | Nut, Plate Mounting | 8 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Seat Belt (For Suspension Seat) (For Kab Seat)
| 09***00 | Belt? Tether,Tether (2inch) | 2 |
| 17***00 | Belt? Lap | 1 |
| 17***01 | Belt? Lap,Lap | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Operator'S Compartment And Control System : Seat Belt (For Suspension Seat) (For Tatiesu Seat)(#B20001-B20060)
| 09***01 | Bolt,(For Shipping) | 4 |
| 09***02 | Washer,(For Shipping) | 4 |
| 09***03 | Nut,(For Shipping) | 4 |
Power Train And Final Drive
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Final Drive (L.H.)(#B20001-B20500)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(With Body Positioner) | 8 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Final Drive (L.H.)(#B20501-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(With Body Positioner) | 2 |
| 01***45 | Bolt,(For 60ton Dump Body) | 12 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Final Drive (Mount)
| 01***45 | Bolt,(For 60ton Dump Body) | 46 |
| 01***60 | Capscrew | 6 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 46 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Final Drive (R.H.)(#B20001-B20500)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(With Body Positioner) | 8 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Final Drive (R.H.)(#B20501-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***30 | Bolt,(With Body Positioner) | 2 |
| 01***45 | Bolt,(For 60ton Dump Body) | 12 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Bevel Gear And Shaft)
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 12 |
| 01***30 | Bolt,(With Body Positioner) | 8 |
| 01***40 | Bolt (Op) | 16 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Blade Control Bracket)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***45 | Bolt, Mounting Cranking Motor | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Blade Control) (1/2)
| 01***45 | Bolt, Mounting Cranking Motor | 2 |
| 01***08 | Nut (Op) | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Blade Control) (2/2)
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***45 | Bolt, Mounting Cranking Motor | 2 |
| 01***08 | Nut (Op) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Brake Cylinder)
| 01***35 | Bolt,(F4320-52a0 -5 ) | 4 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
| 01***13 | Nut,(See Fig.337) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Brake Valve)
| 01***20 | Bolt,(Without Air Con. Or Heater) | 4 |
| 01***90 | Bolt,For Weight Adjusting Bolt | 2 |
| 01***23 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Case)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***60 | Capscrew | 11 |
| 01***65 | Capscrew - M16 X 2.00 X 90 | 15 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Case) (With Swing Drawber)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***60 | Capscrew | 11 |
| 01***65 | Capscrew - M16 X 2.00 X 90 | 17 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Check Line Less)
| 07***08 | Plug,(D65ex?Px) | 6 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Clutch And Brake)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 40 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 12 |
| 01***20 | Screw | 48 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Main Pump And Transmission Piping)
| 01***40 | Screw, Hex Socket | 4 |
| 01***50 | Capscrew | 4 |
| 01***30 | Bolt,(With Body Positioner) | 6 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Power Line Mount)
| 01***95 | Bolt,Leaning Lock | 20 |
| 01***60 | Washer,(Without Rops Guard? Canopy) | 20 |
| 04***38 | Pin, Dowel | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Power Line Oil Line)
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 4 |
| 01***11 | Nut,(With Under Mirror) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Priority Valve)
| 07***34 | O-Ring,(F2320-62a0 -7 ) | 2 |
| 07***08 | Plug,(Without Lock-Up), Plug | 3 |
| 10***60 | Plug | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Steering Case? Brake Valve And Priority Valve Piping)
| 01***30 | Bolt,(With Body Positioner) | 2 |
| 01***80 | Bolt,(With Corrosion Resistor) | 2 |
| 01***35 | Capscrew | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Steering Piston)
| 01***75 | Bolt - Tube Mounting | 8 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 8 |
| 07***34 | O-Ring,(F4320-70a0 -15 ) | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Transmission Control)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line (Transmission Support)
| 01***60 | Bolt,For Weight Adjusting Bolt | 16 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 16 |
| 07***05 | O-Ring,(F4320-66a0 -10 ) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line Oil Line (Cooling Line)
| 01***55 | Bolt,(See Service News) | 4 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line Oil Line(#B20001-B20500)
| 01***30 | Bolt,(With Body Positioner) | 3 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 9 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Power Line Oil Line(#B20501-)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (1st Clutch)
| 01***75 | Capscrew | 18 |
| 01***23 | Washer,(For Shipping) | 18 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (2nd Clutch)
| 04***24 | Pin,Dowel (For No.3 Housing) | 4 |
| 10***30 | Piston | 1 |
| 10***10 | Seal,(F2370-52a0 -32 ) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (3rd And Forward Clutch)
| 01***32 | Washer, (Without Emergency Steering) | 10 |
| 04***15 | Ring,Snap | 2 |
| 04***15 | Ring,Back-Up | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Case Accessories Parts)
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
| 01***45 | Bolt, Mounting Cranking Motor | 3 |
| 01***65 | Capscrew - M16 X 2.00 X 90 | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Case)
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 11 |
| 01***45 | Bolt, Mounting Cranking Motor | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 15 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Filler And Piping)
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 07***35 | O-Ring,Transmission Valve Mount | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Inching Control)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***08 | Nut,L.H. Thread | 1 |
| 01***11 | Nut - Mounting | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Input)
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 3 |
| 01***60 | Capscrew | 1 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 3 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Output)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***45 | Bolt, Mounting Cranking Motor | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 5 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Pressure Valve)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***60 | Bolt,(With Body Positioner) | 8 |
| 01***75 | Capscrew | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Reverse Clutch)
| 01***32 | Washer,(With Auto Emergency Steering) | 12 |
| 04***15 | Ring,Snap | 2 |
| 04***25 | Ring, Retaining | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Shift Valve)
| 01***55 | Bolt,(10m) | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 3 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Transmission (Shitf Valve Mount And Valve Piping)
| 01***50 | Capscrew | 8 |
| 01***75 | Capscrew | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 12 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Travel Control
| 01***30 | Bolt - M8 X 30lg | 1 |
| 01***30 | Bolt,(With Body Positioner) | 3 |
| 01***05 | Nut,L.H. (For Trimming Dozer) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Power Train And Final Drive : Universal Joint
| 01***32 | Washer, (Without Emergency Steering) | 8 |
| 07***45 | Bolt,(Tree Pusher Dozer) | 8 |
| 12***61 | Bearing,Needle | 2 |
Service Kit And Component Parts
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Blade Lift Cylinder (Inner Part)
| 01***29 | Nut - Front Axle Mounting | 1 |
| 07***05 | O-Ring,(Not Used With Emergency Str.) (K2) | 1 |
| 07***00 | O-Ring,(Y1620-11a0a-11) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Control Valve (1/2)(#B20501-)
| 01***25 | Bolt, Seal Cover Mounting | 2 |
| 01***30 | Bolt | 2 |
| 07***30 | Ring, Seal - Between Sections | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Control Valve (2/2)(#B20501-)
| 07***34 | O-Ring, O-Ring, Oil Level And Fill Plug | 1 |
| 07***34 | O-Ring, At Transmission Filter | 1 |
| 70***61 | O-Ring,(Pc100ss) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Main Pump (For Steering)
| 01***32 | Washer, (Without Emergency Steering) | 8 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 6 |
| 04***12 | Ring, Snap | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Main Pump (For Work Equipment)
| 01***32 | Washer, (Without Emergency Steering) | 4 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 4 |
| 04***18 | Ring, Retaining | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Pilot Valve
| 01***35 | Bolt | 2 |
| 01***20 | Bolt,See Fig. K4010-11a0 | 2 |
| 01***23 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Ripper Cylinder (Inner Parts)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
| 07***25 | O-Ring,Cylinder Head | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Service Kit
| 07***05 | O-Ring,(Not Used With Emergency Str.) (K2) | 1 |
| 07***10 | O-Ring - Strainer Cover | 1 |
| 07***00 | O-Ring,(Y1620-11a0a-11) | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Shoe Bolt And Nut Service Kit
| 20***20 | Nut,Shoe (Y0320-K2) | 50 |
| 20***11 | Shoe Bolt And Nut K.,(For Single) | 1 |
| 20***21 | Bolt? Shoe (Y0320-K3) | 50 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Track Link (K-Type) (Supply Parts)
| 12***20 | Link,Regular? L.H | 74 |
| 12***30 | Link,Regular? R.H | 74 |
| 12***20 | Link? Master,L.H.? Pin Side | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Track Link (Lubricate Type) (Supply Parts)
| 12***20 | Track Link Ass'Y | 1 |
| 12***20 | Link,Regular? L.H | 74 |
| 12***30 | Link,Regular? R.H | 74 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Track Link (Supply Parts)
| 12***10 | Track Link Ass'Y | 1 |
| 12***20 | Link,Regular? L.H | 74 |
| 12***30 | Link,Regular? R.H | 74 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Work Equipment Valve (1/2)(#B20001-B20500)
| 01***25 | Bolt, Seal Cover Mounting | 2 |
| 01***30 | Bolt | 2 |
| 07***30 | Ring, Seal - Between Sections | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Service Kit And Component Parts : Work Equipment Valve (2/2)(#B20001-B20500)
| 07***34 | O-Ring, O-Ring, Oil Level And Fill Plug | 1 |
| 07***34 | O-Ring, At Transmission Filter | 1 |
| 70***61 | O-Ring,(Pc100ss) | 1 |
Under Carriage
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Carrier Roller
| 01***30 | Bolt - Pin Mounting | 1 |
| 01***70 | Bolt,(With Wear Guard) | 4 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Front Idler
| 07***48 | O-Ring,(F4350-64a0 -21 ) | 2 |
| 07***17 | Plug | 2 |
| 12***01 | Idler Ass'Y | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Idler Cushion
| 01***30 | Bolt - M8 X 30lg | 4 |
| 01***80 | Capscrew | 8 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Roller Guard
| 01***35 | Bolt,(With Rops) | 8 |
| 01***45 | Bolt,(For 60ton Dump Body) | 8 |
| 01***13 | Nut,(For Adjustable Rod) | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Roller Guard (Full Guard)
| 01***30 | Bolt,(Not Used When Towing Winch) | 16 |
| 01***35 | Bolt,(With Rops) | 8 |
| 01***40 | Bolt,(For Slag Handling) (For Usa) | 12 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Track Roller(#B20001-B20500)
| 01***75 | Capscrew | 40 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 40 |
| 07***42 | O-Ring, Between Tube And Divider Valve | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Track Roller(#B20501-)
| 01***75 | Capscrew | 40 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 40 |
| 07***42 | O-Ring, Between Tube And Divider Valve | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Track Shoe (Lubricate Type) (Single Grouser) (460mm Wide)
| 12***10 | Track Shoe Ass'Y | 1 |
| 12***20 | Link,Regular? L.H | 74 |
| 12***30 | Link,Regular? R.H | 74 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Track Shoe (Master Link Type) (Dry) (Single Grouser) (406mm Wide)
| 12***00 | Track Shoe Ass'Y | 1 |
| 12***10 | Shoe,Track | 74 |
| 12***20 | Link,Regular? L.H | 74 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Track Shoe (Master Link Type) (Dry) (Single Grouser) (460mm Wide)
| 12***10 | Track Shoe Ass'Y | 1 |
| 12***20 | Link,Regular? L.H | 74 |
| 12***30 | Link,Regular? R.H | 74 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Track Shoe (Master Link Type) (Single Grouser) (406mm Wide) (High Link Type)
| 12***20 | Link,Regular? L.H | 74 |
| 12***30 | Link,Regular? R.H | 74 |
| 12***20 | Link? Master,L.H.? Pin Side | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Under Carriage : Track Shoe (Master Link Type) (Single Grouser) (460mm Wide) (High Link Type)
| 12***20 | Link,Regular? L.H | 74 |
| 12***30 | Link,Regular? R.H | 74 |
| 12***20 | Link? Master,L.H.? Pin Side | 2 |
Work Equipment
Komatsu : D41a-6(S/N B20001-Up) : Work Equipment : Angle Frame
| 01***50 | Bolt,(For D60pl) | 16 |
| 01***45 | Bolt,(For L=529mm Pin) | 4 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 16 |
Komatsu : D41a-6(S/N B20001-Up) : Work Equipment : Angle Frame (Link)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***70 | Bolt | 8 |
| 01***10 | Bolt,For Weight Adjusting Bolt | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Work Equipment : Arm And Brace (For Angle Dozer)
| 01***17 | Protector (Welded) | 1 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 2 |
| 04***30 | Pin, Cotter | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Work Equipment : Blade (For Angle Dozer)
| 02***60 | Bolt | 16 |
| 02***70 | Bolt, Plow | 6 |
| 02***05 | Bolt | 4 |
Komatsu : D41a-6(S/N B20001-Up) : Work Equipment : Blade Lift Cylinder
| (1***1) | Cylinder Ass'Y | 2 |
Komatsu : D41a-6(S/N B20001-Up) : Work Equipment : Hitch
| 01***90 | Bolt (Kit) | 4 |
| 01***60 | Bolt (Itl) | 1 |
| 01***15 | Nut | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Work Equipment : Ripper Cylinder
| (1***0) | Cylinder Ass'Y | 1 |
Komatsu : D41a-6(S/N B20001-Up) : Work Equipment : Swing Drawbar
| 01***50 | Bolt,(For Large Size Tire) | 4 |
| 01***65 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***30 | Capscrew | 4 |
D41A-6(S/N B20001-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. Read the first character of the serial number sequence to identify the prefix. Match the full serial number against the catalog title (e.g., B20001-UP vs 20501-UP) to ensure the correct manual version for the specific market configuration.
| Prefix | Identifies | Notes |
|---|---|---|
| B | D41A-6(S/N B20001-UP) | Identifies the D41A-6 family. Serial range B20001-UP covers export and Japan-spec (JPN) units. JPN documentation may also reference a 20501-UP range; verify the specific serial plate on the machine to select the correct manual version. |
Frequently asked questions
What engine is used in the Komatsu D41A-6?
The machine is equipped with the Komatsu S6D102E-1 engine.
What is the operating weight of this model?
Operating weight varies by configuration and series; however, related D41P-6 models are documented at approximately 20,327 lb (9.22 t).
What replaced the D41A-6?
The D41A-6 is part of a lineage that includes later generations such as the -7 and -8 series, which introduced different emissions tiers and telematics.
What D41A-6(S/N B20001-UP) owners discuss
What engine is installed in the Komatsu D41A-6 (S/N B20001-UP)?
The machine is equipped with a Komatsu S6D102E-1 engine. Some documentation for related series also references the SA6D102E-2 engine; verify your specific serial number against the engine nameplate on the block near the injection pump.
What are the known transmission and drive behaviors for this model?
The D41A-6 utilizes a Hydroshift transmission, which integrates manual gear selection with hydraulic drive efficiency. Operators may find the gear selection method requires significant wrist movement. In some reported cases of drive failure, one side of the machine may stop pulling while the track continues to roll and brakes remain functional.
What engine symptoms should be monitored during operation?
Operators have reported severe engine rattling accompanied by smoke emitting from the valve cover breather. While no metal shavings were noted on dipsticks in these instances, such symptoms require immediate inspection of the valve train and oil levels.
What electrical or sensor faults are common on this series?
Common fault codes include CA144 (high coolant temperature sensor feedback fault), CA145 (coolant temperature sensor voltage too low or short circuit), and CA153 (intake air temperature sensor voltage too high). Always have your dealer verify electronic diagnostic results.
What maintenance focus is required for the undercarriage and hydraulics?
Maintenance must follow the hour-based schedule: daily, 250, 500, 1,000, 2,000, and 4,000 hours. Focus on lubrication points for the undercarriage and monitoring hydraulic system integrity. Use Komatsu genuine lubricants to meet engineering standards.
What should be checked when purchasing a used D41A-6 (S/N B20001-UP)?
Verify the serial number on the chassis-engraved frame against the riveted plate on the front frame casting; a mismatch is a primary signal of stolen equipment. Additionally, check for any discrepancy between the dashboard hour-meter and telematics records, as gaps exceeding 50 hours may indicate hour-meter rollback.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific D41A-6(S/N B20001-UP) part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.