Komatsuwheel loaderlarge (wa400 - )
Komatsu WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu WA500-1L (S/N 10420-UP & A10411-A20853) is a heavy-duty wheel loader designed for high-production applications such as quarry loading, aggregate yards, and bulk earthmoving. This series features the Komatsu S6D140-1 engine and is engineered to operate in extreme environments ranging from -40 to +50 degrees Celsius. The machine is characterized by its large bucket capacities and robust powertrain designed for heavy material handling.
Across different generations, the WA500 series has evolved from the foundational WA500-1 configurations to advanced Tier 4 Final models like the WA500-8. While older units focus on raw mechanical durability, newer iterations integrate advanced technologies like the auto-digging system and improved emissions controls. In today's used market, these machines remain highly valued for their heavy-duty chassis and reliable Komatsu powertrain, making them critical assets for fleets requiring high-volume 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 WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) specifications
Engine
| Model | SAA6D140E |
| Net Power | 263 kW (353 HP) @ 1,900 rpm |
| Cylinders | 6 |
| Bore x Stroke | 5.51 in x 6.50 in |
| Displacement | 930 in³ |
| Aspiration | Variable geometry turbo-charged, after-cooled, cooled EGR |
Weights
| Operating Weight | 34.504 - 35.734 tons |
Dimensions
| Transport Length | 8.81 m (28 ft 11 in) |
| Transport Width | 3.3 m |
| Transport Height | 3.63 m |
Performance
| Bucket Capacity | 4.4 m³ (4.6 yd³) |
| Maximum Lift Height | 3.5 - 4.5 m |
Service capacities (summary)
| Fuel Tank Capacity | 200 - 500 L |
| Engine Oil | Komatsu EO / Shell Donax TT or TD |
| Hydraulic Oil | Komatsu HO / Caltex RPM Tractor Hydraulic Fluid |
| Axle Oil | Komatsu AXO |
| Coolant | Komatsu AF-NAC / Castrol Radicool SF Premix |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | not documented | Komatsu EO (Diesel engine oil) |
| Cooling system | not documented | Komatsu Super-coolant AF-NAC |
| Transmission/powertrain compartments | not documented | Komatsu TO (Powertrain oil) |
| Final drives (each) | not documented | Komatsu AXO (Axle oil); SAE 30 engine oil may substitute for axle oil |
| Hydraulic system and tank | 156 L (41.22 US gal) | Komatsu HO (Hydraulic oil); Shell Donax TT or TD, Caltex RPM Tractor Hydraulic Fluid, Chevron Tractor Hydraulic Fluid, Texaco TDH Oil, or Mobil Mobiland Super Universal |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,500 h |
|
Servicing the WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA (Komatsu Oil Wear Analysis) at every major service interval to monitor wear metals such as iron, copper, and lead. Regularly sample hydraulic fluid to track particle counts and viscosity changes. For the WA500-1L engine, use API classification CD oil; if using API CC, reduce change intervals by half. Monitoring these laboratory-grade results via KOMTRAX allows for identifying potential pump or engine failures before they cause catastrophic downtime.
Corrective & Common Repairs
Monitor hydraulic pumps for performance drops; aftermarket replacements like the 705-52-30130 are available for this series. If brake noise occurs, verify it is not a durability issue per factory specifications. Regularly inspect steering and brake cylinders for leaks. When replacing injectors or engine controllers, ensure all compensation values are correctly written to the system to maintain proper engine output and fuel efficiency.
Overhaul & Rebuild Points
Major milestones require comprehensive component evaluations. At 2,000 hours, perform a full transmission service and coolant flush. During heavy rebuildings, inspect the torque converter, transmission control valves, and main relief valves. For the engine, evaluate the EGR system, KCCV ventilator, and turbocharger condition. Structural inspections should focus on the center hinge pin, axle mounts, and bucket linkage to identify fatigue in high-stress areas.
Seasonal & Environment Servicing
In extreme cold, ensure the preheating system is functional and consider SAE 5W-20CD engine oil for hydraulic systems. During high-dust operations, increase frequency of air filter inspections and radiator fin cleaning to prevent overheating. For all environments, replace hydraulic hoses every 2 years maximum to prevent bursts. Ensure the cooling system SCA levels are tested regularly to protect against corrosion in varying water qualities.
WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 425-16-11112 | Oil Filter Assembly | Lubrication service | Check fitment → |
| 08036-01414 | Clip,(For Add.Filter)(Except Japan) | Scheduled service item | Check fitment → |
| 205-60-51270 | Element | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E03 | Swing parking brake system or safety lever system discrepancy | Lever connectivity or alignment issues | Inspect lever connectivity and alignment |
| E10 | Engine controller power failure or engine management system malfunction | Engine stall or circuit malfunction in the control drive system | Examine interfacing points and consider controller replacement |
| E11 | Engine control failure | System error resulting in reduced output power to protect the engine | Inspect engine control system for faults |
| E15 | Engine sensor malfunction | Faults in temperature, fuel pressure, or oil pressure sensors | Verify integrity of engine sensors and interconnections |
| AA10NX | Air filter clogging | Excessive dust or debris accumulation in the air cleaner | Inspect and clean or replace air filter |
| AB00KE | Low charging voltage | Alternator malfunction or low battery charge voltage | Check alternator output and battery condition |
| B @ BAZG | Low engine oil pressure | Insufficient lubrication or sensor failure | Check engine oil level and pressure |
| B @ BCNS | Engine coolant overheating | Coolant temperature exceeding safe operating limits | Inspect cooling system and engine water temperature |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) attachments & work tools
Front Loader Buckets
Standard bucket capacities for this class range from 1.5 m³ to 14 m³. Specific configurations for related series include a 4.4 m³ capacity and a 5.3 m³ capacity.
Ground Engaging Tools
Available components include cutting edges, teeth systems, lip systems, and shrouds. Specialized wear products such as bimetallic wear products are also available for heavy-duty use.
Mounting & Coupler Systems
The machine supports various coupler configurations. Specific aftermarket options include angled attachments.
Hydraulic & Operational Kits
Hydraulic kits are available for specific tool integration. The machine utilizes advanced hydraulic technology to support smooth and responsive operation.
Factory Configurations & Guarding
Standard cab features include ROPS/FOPS Level 2 protection. Optional equipment may include specialized lighting or additional operator environment enhancements.
All WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) assemblies by section
Every catalogued assembly group for the Komatsu WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Drive Shaft, Axles Wheels & Brake Systems
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Air Piping Compressor To Wet Tank
| 01***75 | Bolt,(For Shipping) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Brake Oil Piping Chamber To Front Wheel Brake
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 11 |
| 01***50 | Bolt,(With Service Valve R.H.) | 4 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 4 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Brake Oil Piping Chamber To Rear Wheel Brake
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Drive Shaft (Center - On Machines S/N A20226 And Down)
| 01***60 | Bolt, Upper Shaft Mounting | 8 |
| 41***30 | Lubrication Nipple | 3 |
| 42***20 | Spider Assembly | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Drive Shaft (Center - On Machines S/N A20227 And Up)
| 01***60 | Bolt, Upper Shaft Mounting | 8 |
| 42***60 | Shaft Assembly, Drive - Center | 1 |
| 42***70 | Yoke And Shaft Assembly | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Drive Shaft (Front - On Machines S/N A20226 And Down)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***70 | Bolt - Radiator To Rear Frame | 6 |
| 01***30 | Capscrew | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Drive Shaft (Front - On Machines S/N A20227 And Up)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***70 | Bolt - Radiator To Rear Frame | 6 |
| 01***30 | Capscrew | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Drive Shaft (Rear - On Machines S/N A20226 And Down)
| 01***60 | Bolt, Upper Shaft Mounting | 8 |
| 41***30 | Lubrication Nipple | 2 |
| 41***40 | Lubrication Nipple | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Drive Shaft (Rear - On Machines S/N A20227 And Up)
| 01***60 | Bolt, Upper Shaft Mounting | 8 |
| 42***10 | Seal, Oil | 1 |
| 42***20 | Ring, Retainer | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Front And Rear Axle Final Drive
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 24 |
| 01***60 | Bolt, Hanger Bearing Mounting | 16 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 12 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Front And Rear Axle Wheel Brake
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 12 |
| 01***40 | Bolt,(Not Used With Cab) | 36 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Front Axle Differential
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***45 | Bolt,(For Slag Handling) | 24 |
| 01***65 | Bolt - Battery Box | 10 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Front Axle Housing
| 01***30 | Bolt,Radio Controlled Slag Handling | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
| 04***60 | Screw, Serial Number Plate | 4 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Rear Axle Differential
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***45 | Bolt,(For Slag Handling) | 18 |
| 01***65 | Bolt - Battery Box | 10 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Rear Axle Housing
| 01***50 | Bolt, Radiator To Frame | 14 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Wheel Brake Chamber
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 6 |
| 01***10 | Nut (K10) | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Wheels And Tires 26.5 X 25
| 09***20 | Valve Ass'Y,Tire | 1 |
| 09***30 | Stem, Valve | 1 |
| 09***01 | Core, Valve | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Drive Shaft, Axles Wheels & Brake Systems : Wheels And Tires 29.5 X 25
| 09***20 | Valve Ass'Y,Tire | 1 |
| 09***30 | Stem, Valve | 1 |
| 09***41 | Core, Valve | 1 |
Engine Related Parts & Electrical System
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Engine Related Parts & Electrical System : Electrical System (Engine Sensor)
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 1 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 8 |
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Engine Related Parts & Electrical System : Electrical System (Main Line - Engine Compartment) (2/2)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 8 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Engine Related Parts & Electrical System : Electrical System (Main Line - Floor) (1/2)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Engine Related Parts & Electrical System : Engine Mounting Parts
| 01***15 | Bolt | 4 |
| 01***60 | Bolt | 2 |
| 01***45 | Washer,(Without R.O.P.S.) | 4 |
Frame, Guard & Superstructure
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Frame, Guard & Superstructure : Front Frame
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 01***45 | Bolt, Mount Center Hinge Retainer (Lower) | 10 |
| 01***50 | Screw | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Frame, Guard & Superstructure : Operator'S Seat Komatsu - S/N A20326 And Down
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 4 |
| 01***20 | Bolt - Mount Risers To Cab Floor | 4 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Frame, Guard & Superstructure : Operator'S Seat Mounting (Sear'S Mfg. - S/N A20327 And Up)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 4 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Frame, Guard & Superstructure : Operator'S Seat Sear'S Mfg. - S/N A20327 And Up
| 01***23 | Washer | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 02***25 | Bolt,(Europe Spec.) | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Frame, Guard & Superstructure : Operator'S Seat Suspension Sear'S Mfg. - S/N A20327 And Up
| 42***20 | Suspension Assembly | 1 |
| 42***30 | Bearing Kit | 1 |
| 42***10 | Spring, Conical | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Frame, Guard & Superstructure : Seat Belt For Komatsu Or Rigid Type Seat
| 02***19 | Bolt,Tether | 2 |
| 09***01 | Bolt,(For Shipping) | 2 |
| 09***02 | Washer,(For Shipping) | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Frame, Guard & Superstructure : Vandalism Protection
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 3 |
| 01***05 | Nut,(For Air Conditioner Less), Nut | 2 |
| 01***23 | Washer,(With Auto Emergency Steering) | 2 |
Mark Plates, Tools & Kits
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Mark Plates, Tools & Kits : Marks And Plates (Without Cabs) (English)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***00 | Plate, Caution, Hydraulic Tank | 1 |
| 09***00 | Product Graphic, Important - Diesel Fuel | 1 |
Steering Control System
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Steering Control System : Emergency Steering Piping Diverter Valve To Steering Valve And Switch Pump
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 8 |
| 01***35 | Bolt,(For Position Fixing) | 4 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Steering Control System : Emergency Steering Piping Emergency Pump To Diverter Valve
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Steering Control System : Steering And P.O.C. Pump
| 42***60 | Flange - Mounting | 1 |
| 42***90 | Plate - Pressure | 2 |
| 42***10 | Plate - Isolation | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Steering Control System : Steering Oil Piping Steering Demand Valve To Steering Cylinders
| 01***30 | Bolt,(For Mechanical Governor) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***75 | Bolt,(For Adjusting) | 4 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Steering Control System : Steering Piping Steering Pump To Control Valve
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***40 | Bolt,(With Service Valve R.H.) | 4 |
Torque Converter And Transmission
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Torque Converter And Transmission : Torque Converter And Transmission Piping
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***40 | Bolt, Mount Master Brake Cylinder | 1 |
| 01***50 | Bolt,(With Service Valve R.H.) | 3 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Torque Converter And Transmission : Torque Converter Mounting
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 10 |
| 01***45 | Bolt, Mounting Bracket To Radiator (Top) | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Torque Converter And Transmission : Torque Converter Transmission Pump
| 42***11 | Pump Assembly | 1 |
| 42***50 | Body | 1 |
| 42***60 | Flange - Mounting | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Torque Converter And Transmission : Universal Joint (On Machines - S/N A20226 And Down)
| 01***50 | Bolt - Spider To Transmission And To Front Drive | 8 |
| 42***20 | Spider, Assembly | 2 |
| 42***30 | Lubrication Nipple | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Torque Converter And Transmission : Universal Joint (On Machines - S/N A20227 And Up)
| 01***50 | Bolt - Spider To Transmission And To Front Drive | 8 |
| 42***10 | Joint Assembly, Universal | 1 |
| 42***20 | Yoke | 1 |
Work Equipment
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment : Bucket Hinge Pins
| 01***30 | Bolt,(For Rubber Shoe) | 1 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 6 |
| 01***85 | Bolt,(For Perforated Mask) | 8 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment : Bucket Teeth (Bolt-On Type)
| 01***80 | Washer,(For R.H. Steering) | 2 |
| 09***11 | Bolt, Mount Corner Teeth (Bottom) | 22 |
| 09***23 | Nut | 24 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment : Excavator Bucket (S/N A20277 & Up)
| 42***22 | Edge, Cutting | 1 |
| 42***30 | Plate (Welded) | 1 |
| 42***50 | Plate, L.H. (Welded) | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment : Excavator Bucket (With Teeth)(S/N A20277 & Up)
| 42***22 | Edge, Cutting | 1 |
| 42***10 | Bucket, 4.0 M? (5.2 Yd?) | 1 |
| 42***20 | Plate (Welded) | 1 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment : Lift Arm
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,(For Rubber Shoe) | 10 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 16 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment : Rock Bucket Spade Nose Edge (With Teeth)(S/N A20277 & Up)
| 42***20 | Plate (Welded) | 1 |
| 42***30 | Plate (Welded) | 1 |
| 42***40 | Plate (Welded) | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment : Stockpile Bucket (S/N A20277 & Up)
| 42***22 | Edge, Cutting | 1 |
| 42***50 | Plate, L.H. (Welded) | 1 |
| 42***60 | Plate, R.H. (Welded) | 1 |
Work Equipment Control System
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment Control System : Hydraulic Pilot Control Piping Pump To Relief Valve
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***45 | Screw | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment Control System : Hydraulic Piping Tank To Pumps & Steering Demand Valve
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 4 |
| 01***55 | Bolt, Mount Tube To Switch Pump | 4 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 10 |
Komatsu : Wa500-1l Supplement(S/N 10420-Up & A10411-A20853) : Work Equipment Control System : Work Equipment And Switch Pump
| 42***60 | Flange - Mounting | 1 |
| 42***90 | Plate - Pressure | 2 |
| 42***10 | Plate - Isolation | 1 |
WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) serial number reference
The serial plate is located on the front frame, on the right-hand side of the articulation joint. Read the full serial number from the plate to determine if it falls within the 10420-UP or A10411-A20853 ranges.
| Prefix | Identifies | Notes |
|---|---|---|
| A10411 | WA500-1L SUPPLEMENT | Start of the serial range A10411-A20853 for this configuration. |
| 10420 | WA500-1L SUPPLEMENT | Start of the serial range 10420-UP for this configuration. |
Frequently asked questions
What engine is used in this model?
The WA500-1L is powered by the Komatsu S6D140-1 engine.
What is the operating weight of the machine?
The operating weight varies by configuration; for example, the WA500-1 was documented at approximately 27.5 tons (27,215 lb).
What model replaced the WA500 series?
The series progressed through various iterations including the WA500-3, WA500-6, and the modern WA500-8 yard loader.
What WA500-1L SUPPLEMENT(S/N 10420-UP & A10411-A20853) owners discuss
What are common hydraulic and transmission leakage patterns observed on older WA500-1 series units?
Main and switch pumps may leak into the transmission case. In older aluminum-bodied pump configurations, these pumps can become loose over time, increasing pressure on the input shaft seal.
What engine is used in the Komatsu WA500-1L SUPPLEMENT (S/N 10420-UP & A10411-A20853) and what are its known performance issues?
The WA500-1L uses the S6D140-1 engine. Operators have reported that machines running at high temperatures may experience widespread O-ring degradation, requiring frequent replacements.
What electrical or sensor issues can cause a Komatsu loader to fail to move despite the dashboard indicating neutral?
Potential causes include a faulty neutral safety switch, damaged transmission control solenoids, or wiring disconnections. Additionally, unstable power supplies or battery health issues can trigger electronic control module faults.
What are common symptoms of fuel system failure in Komatsu WA500 series engines?
Low rail pressure codes may occur due to clogged fuel filters. In some series, a weak lift pump or pressure pump for the common rail system can cause the machine to power down once the engine reaches operating temperature.
What should be checked when inspecting a used WA500-1L SUPPLEMENT (S/N 10420-UP & A10411-A20853) for purchase?
Verify engine hours against service documentation; extremely low hours on older units may be suspect. Inspect the turbocharger for signs of failure and check all O-rings and seals for heat-related degradation. For machines with electronic systems, confirm the ability to connect a scan tool for diagnostic code retrieval.
What are the recommended fluid types for maintaining Komatsu wheel loader components?
Standard requirements include Diesel engine oil (Class-CD SAE30 is a possible substitute for axle oil), Komatsu AXO, TO, or HO fluids, and specialized hydraulic oils. For cooling systems, use long-life organic acid technology (OAT) concentrates mixed with 50% v/v high-quality water, or specific brands like Castrol Radicool SF Premix.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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