Komatsuwheel loadersmall ( - wa120 / sk*)
Komatsu WA40-1(S/N 1001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu WA40-1 is a compact articulated wheel loader manufactured from 1987 to 1989, succeeding the WA40 series and preceding the WA40-2. Designed for utility and light construction work, this machine features a 4D95L-W-1A diesel engine and an operating weight of approximately 3.4 tons (3,400 kg). It is available in configurations including standard bucket, multi-blade, and snow removal attachments. The WA40-1 was engineered for tight access jobsites, offering a transport length of 4.78 meters and a maximum discharge height of 2.47 meters, making it a versatile tool for municipal, agricultural, and landscaping applications.
Across the WA40 lineage, the primary evolution involved engine upgrades and emissions compliance, moving from the older 4D95L series to more modern powertrains in later generations. The WA40-1 remains significant in the used and parts market because its simple, non-complex mechanical systems make it highly serviceable for independent shops. Its compact size and durable Torqflow transmission ensure a steady demand for replacement undercarriage components, hydraulic seals, and engine parts, particularly as older units are retrofitted for modern fuel standards or specialized winter operations.
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 WA40-1(S/N 1001-UP) specifications
Engine
| Model | 4D105 |
| Gross Power | 72 hp (53.7 kW) |
| Displacement | 264 cu in (4.32 L) |
| Cylinders | not documented for this exact serial range — verify with your dealer |
| Emissions Tier | not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight | 14,175.8 lb (6,429 kg) |
| Shipping Weight | not documented for this exact serial range — verify with your dealer |
| Ground Pressure | not documented for this exact serial range — verify with your dealer |
Dimensions
| Transport Length | 17.79 ft (5.42 m) |
| Transport Width | 7.29 ft (2.22 m) |
| Transport Height | 9.44 ft (2.88 m) |
| Wheelbase | 8.01 ft (2.44 m) |
| Ground Clearance | 1.32 ft (0.40 m) |
| Turning Radius | 16.2 ft (4.94 m) |
Performance
| Max Speed - Forward | 21.5 mph (34.6 km/h) |
| Max Speed - Reverse | 21.2 mph (34.1 km/h) |
| Breakout Force | 13,070 lb (58.1 kN) |
| Gradeability | not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Fuel Tank | 31 gal (117.3 L) |
| Hydraulic System | not documented for this exact serial range — verify with your dealer |
| Engine Oil | not documented for this exact serial range — verify with your dealer |
| Cooling System | 8.5 gal (32.2 L) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu WA40-1(S/N 1001-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the WA40-1(S/N 1001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu KOWA oil analysis at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check coolant SCA concentration at 500 hours to prevent cavitation in the 4D95L-W-1A engine block. Monitor transmission oil viscosity and hydraulic oil particle count at 1,000 hours to detect early torque converter or pump wear. Use KOMTRAX telematics data to correlate high-load cycles with fluid degradation rates, ensuring timely sampling before critical component failure occurs.
Corrective & Common Repairs
Address frequent leaks at the axle shaft seals and hydraulic cylinder rod wipers common in the WA40-1 chassis. Replace the fuel filter and water separator elements promptly to protect the injection pump. Inspect the Torqflow transmission oil cooler for internal clogging if power shifts are sluggish. Check the articulation joint pins and bushings for excessive play, which causes steering drift. Replace worn brake pads and inspect the wet disc brake assembly for glazing or scoring.
Overhaul & Rebuild Points
Plan for major powertrain overhaul around 10,000 to 15,000 hours, focusing on the torque converter and transmission clutch packs. Rebuild the hydraulic pump and control valve spools if flow rates drop below specification or internal leakage is detected. Inspect the final drive planetary gears and axle shafts for pitting or fatigue cracks during the 20,000-hour service window. Overhaul the 4D95L-W-1A engine if compression drops below tolerance or oil consumption exceeds limits due to ring or valve seat wear.
Seasonal & Environment Servicing
In cold weather, drain the fuel separator daily to prevent water freezing in the lines. Use Komatsu Super Coolant AF-NAC or equivalent to maintain proper freeze protection and SCA levels. Switch to lower viscosity engine oil (e.g., SAE 5W-30) for cold starts to ensure proper lubrication. In dusty environments, clean the air filter more frequently and check the restriction indicator often. Inspect the radiator and oil cooler fins for insect or chaff buildup to prevent overheating during high-load summer operations.
WA40-1(S/N 1001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 362-54-27280 | Plate? Instruction,Fuel Filter | Fuel system service | Check fitment → |
| 363-54-16220 | Plate? Mark,Fuel Filter | Fuel system service | Check fitment → |
| 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 → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
WA40-1(S/N 1001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify the voltage at the pin connector |
| CA111 | Internal engine controller fault | ECM internal abnormality | Replace or reprogram the ECM |
| CA441 | Battery voltage too low | Alternator or battery failure | Replace the alternator or battery and check the voltage regulator |
| CA442 | Battery voltage too high | Alternator or battery failure | Replace the alternator or battery and check the voltage regulator |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| CA122 | Intake air pressure high voltage | Sensor malfunction or actual overpressure condition | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure low voltage | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| CA153 | Intake air temperature sensor error (high) | Sensor malfunction | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor error (low) | Sensor malfunction | Replace or test the IAT sensor |
| CA428 | Fuel moisture sensor invalid voltage (high) | Contaminated fuel supply or sensor harness issue | Ensure a clean fuel supply and check the moisture sensor harness |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
WA40-1(S/N 1001-UP) attachments & work tools
Standard Buckets
The Komatsu WA40-1 (S/N 1001-UP) is equipped with a standard heaped bucket capacity of 1.57 cubic yards (1.2 cubic meters). The bucket width measures 7.85 feet (2.4 meters), designed for general material handling in this weight class.
Hydraulic Coupler Systems
The WA40-1 utilizes a standard quick-coupler mounting system for rapid tool changes. Operators must verify the availability of dedicated spool valve kits from Komatsu to ensure proper hydraulic flow and spool valve compatibility when adding auxiliary attachments via the power beyond port.
Specialty Buckets
Factory configurations include high-production yard loader arrangements for specific operational needs. Additional bucket options such as multi-blade or spike configurations are available as aftermarket or dealer-installed options for specialized material handling.
Guarding and Protection
Standard guarding options include ROPS (Roll-Over Protective Structure) and FOPS (Falling-Object Protective Structure) cabs. Additional protection for the undercarriage and hydraulic lines is typically available as a dealer-installed package to extend component life in abrasive environments.
All WA40-1(S/N 1001-UP) assemblies by section
Every catalogued assembly group for the Komatsu WA40-1(S/N 1001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
4d95l-W-1a Engine S/N 10001-Up
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Air Cleaner
| 04***10 | Ring,See Fig. K4010-65a0 | 1 |
| 60***00 | Element Ass'Y,Outer | 1 |
| 60***60 | Gasket | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Air Intake Manifold And Connection(#10001-30835)
| 01***25 | Stud | 1 |
| 01***25 | Bolt,(With Corrosion Resistor) | 3 |
| 01***75 | Bolt,(For Shipping) | 8 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Air Intake Manifold And Connection(#30836-)
| 01***25 | Stud | 1 |
| 01***12 | Bolt,(With Speedometer) | 1 |
| 01***25 | Bolt,(With Corrosion Resistor) | 3 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Alternator (25a)(#10001-16927)
| 60***11 | Alternator A. (25a) | 1 |
| KD***52 | Bolt,Through | 3 |
| KD***70 | Rear Bracket Ass'Y | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Alternator (25a)(#16928-)
| 60***20 | Alternator A. (25a),(With Non Hardening Pulley) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***70 | Bracket,Front | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Alternator And Mounting
| 01***30 | Bolt,(For Trimming Dozer) | 1 |
| 01***55 | Bolt,(With Engine Stop Motor Type) | 1 |
| 01***11 | Nut,(For Center Guard) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Camshaft And Tappet
| 01***20 | Screw | 2 |
| 04***16 | Fitting Wedge | 1 |
| 62***30 | Plate,Thrust | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Crankshaft
| 61***20 | Bolt | 1 |
| 62***00 | Main Metal Ass'Y | 5 |
| 62***00 | Thrust Metal Ass'Y | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Cylinder Block
| 01***14 | Bolt | 2 |
| 04***20 | Pin,Dowel (Welded) | 2 |
| 04***28 | Pin, Dowel - Transmission Case, Pin-Dowel | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Cylinder Head
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 02***04 | Plug | 1 |
| 07***08 | Plug, Expansion | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Cylinder Head Cover
| 61***10 | Cap, Oil Filler | 1 |
| 61***20 | Screw | 3 |
| 61***30 | Washer,(B) | 3 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Exhaust Manifold And Muffler
| 01***25 | Grub Screw | 4 |
| 01***45 | Bolt, Bracket Mounting | 7 |
| 61***71 | Distance Piece | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Flywheel And Flywheel Housing
| 01***30 | Bolt | 6 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 11 |
| 09***50 | Liquid Gasket, Lg-7, 150g | 0 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Front Cover And Gear(#10001-10024)
| 01***70 | Bolt,(For 75a Alternator) | 1 |
| 01***16 | Bolt | 2 |
| 01***20 | Bolt,(With Tachometer Outlet) | 8 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Front Cover And Gear(#10025-)
| 01***70 | Bolt,(For 75a Alternator) | 1 |
| 01***20 | Bolt,(With Tachometer Outlet) | 2 |
| 01***16 | Screw | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Fuel Filter(#10001-11258)
| 01***30 | Screw | 2 |
| 01***65 | Bolt,(With Water Separator) | 2 |
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Fuel Filter(#11259-)
| 01***30 | Screw | 2 |
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Fuel Injection Pump (Feed Pump)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***20 | Pump,Priming | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Fuel Injection Pump (Governor) (1/2)
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Fuel Injection Pump (Governor) (2/2)
| DK***40 | Gasket,Air Compressor | 2 |
| DK***20 | Capsule,Spring | 1 |
| DK***00 | Nut,Cap | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Fuel Injection Pump (Pump)
| 62***10 | Injection Pump A | 1 |
| DK***40 | Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-0040 | 0 |
| DK***30 | Bearing | 0 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Fuel Injection Pump And Piping
| 01***35 | Stud | 4 |
| 01***12 | Bolt | 2 |
| 01***25 | Screw | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-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 : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Heater Signal
| 60***61 | Signal,Heater | 1 |
| 60***80 | Cap | 1 |
| 60***90 | Cap | 3 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Lubricating Oil Filter
| 60***40 | Cartridge,Engine Oil Filter (D31s) | 1 |
| 62***10 | Nipple | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Lubricating Oil Pump And Suction Pipe
| 01***16 | Screw | 5 |
| 01***20 | Screw | 2 |
| 62***00 | Oil Pump Ass'Y | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Nozzle Holder
| 07***10 | Tube,Spill | 1 |
| 60***40 | Glow Plug,Glow | 4 |
| 62***00 | Nozzle Holder Ass'Y | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Oil Pan
| 01***25 | Bolt,(With Corrosion Resistor) | 19 |
| 01***00 | Bolt | 5 |
| 09***50 | Liquid Gasket, Lg-7, 150g | 0 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Piston And Connecting Rod
| 04***12 | Ring, Snap | 8 |
| 62***00 | Piston Ring Ass'Y,Per Cylinder | 4 |
| 62***00 | Piston Ring Ass'Y,Per Cylinder | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-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 : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Starting Motor (2.8kw)
| 60***30 | Starting Motor Ass'Y,(2.8kw) | 1 |
| KD***01 | Washer,Seal | 2 |
| KD***42 | Screw | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Starting Motor And Mounting
| 01***30 | Bolt | 2 |
| 07***95 | O-Ring,Transmission Strainer | 1 |
| (6***0) | Starting Motor Ass'Y,(2.8kw) (See Fig.0661) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : 4d95l-W-1a Engine S/N 10001-Up : Water Pump And Cooling Fan
| 01***16 | Screw | 5 |
| 01***20 | Screw | 2 |
| 01***40 | Screw | 7 |
Drive Shaft? Differential And Wheels
Komatsu : Wa40-1(S/N 1001-Up) : Drive Shaft? Differential And Wheels : Axle Housing
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 16 |
| 01***40 | Bolt,(With Center Guard) | 32 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 16 |
Komatsu : Wa40-1(S/N 1001-Up) : Drive Shaft? Differential And Wheels : Brake
| 01***75 | Bolt,(For Adjusting) | 5 |
| 01***20 | Screw | 1 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 6 |
Komatsu : Wa40-1(S/N 1001-Up) : Drive Shaft? Differential And Wheels : Brake Pedal And Piping
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 3 |
| 01***55 | Bolt, Mount Lh Bracket | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Drive Shaft? Differential And Wheels : Differential
| 01***70 | Bolt, Spacer | 32 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Drive Shaft? Differential And Wheels : Drive Shaft
| 12***51 | Pin,Cross | 4 |
| 12***71 | Bearing,Needle | 8 |
| 36***30 | Bolt | 16 |
Komatsu : Wa40-1(S/N 1001-Up) : Drive Shaft? Differential And Wheels : Master Cylinder
| 36***12 | Repair Kit | 1 |
| 36***11 | Master Cylinder A | 1 |
| 36***10 | Rod | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Drive Shaft? Differential And Wheels : Parking Brake Lever
| 01***16 | Bolt (Welded) | 2 |
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Drive Shaft? Differential And Wheels : Wheel (Tubeless)(#1427-)
| 36***40 | Cap | 1 |
| 36***11 | Wheel Ass'Y,Front? L.H. And Rear? L.H | 2 |
| 36***21 | Wheel Ass'Y,Front? R.H. And Rear? R.H | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Drive Shaft? Differential And Wheels : Wheel(#1001-1426)
| 36***40 | Cap | 1 |
| 36***10 | Wheel Ass'Y,Front? L.H. And Rear? L.H | 2 |
| 36***20 | Wheel Ass'Y,Front? R.H. And Rear? R.H | 2 |
Engine Related Parts And Electrical System
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Accelerator Pedal And Linkage
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Air Cleaner Connection
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
| 07***09 | Clamp,(See Fig. K0210-16a0) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Back Buzzer
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Battery
| 01***30 | Bolt,(Cold Terrain Spec.) | 1 |
| 01***18 | Bolt | 1 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (Front)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (Rear) (1/2)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Electrical System (Rear) (2/2)
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 2 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Engine And Transmission Movnting Parts
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 10 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Exhaust Connection And Muffler
| 01***25 | Bolt,Without Revolution Sensor | 6 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 8 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Fuel Tank
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 9 |
| 01***30 | Bolt,(For Rubber Shoe) | 4 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Instrument Panel
| 01***10 | Screw,(For Lighter) | 9 |
| 01***10 | Screw,R.H. Door | 4 |
| 01***05 | Washer,(Without Window Washer) | 9 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Instrument Panel (With Steel Cab)
| 01***10 | Screw,(For Lighter) | 9 |
| 01***10 | Screw,R.H. Door | 4 |
| 01***05 | Washer,(Without Window Washer) | 9 |
Komatsu : Wa40-1(S/N 1001-Up) : Engine Related Parts And Electrical System : Radiator
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 10 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
Frame And Guard
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Air Conditioner Piping
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Beacon Lamp
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 4 |
| 08***08 | Grommet,(Without Beacon Lamp) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Canopy(#1001-1563)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 16 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 16 |
| 01***32 | Washer,(With Auto Emergency Steering) | 8 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Canopy(#1564-)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 16 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 16 |
| 01***32 | Washer,(With Auto Emergency Steering) | 8 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Counter Weight
| 01***50 | Bolt,(For Tbg/Abe Spec.) | 4 |
| 01***90 | Bolt | 2 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Counter Weight (Op)
| 01***65 | Bolt,(With Canvas Or Rops Canopy) | 4 |
| 01***80 | Bolt,(For 100kg) | 4 |
| 01***20 | Bolt,(For 200kg) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Floor Frame And Dashboard
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 10 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 7 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Frame
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Front Cover
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 6 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 14 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Operator'S Seat
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***10 | Nut,(Without Air Conditioner) | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 8 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Rear Cover (1/2)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 17 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Rear Cover (2/2)
| 01***16 | Bolt (With Air Heater & Conditioner) | 12 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 10 |
| 01***10 | Screw,(For Lighter) | 24 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Rops Cab (1/4)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***10 | Screw,(For Lighter) | 2 |
| 01***16 | Screw, Mount Parking Lights | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Rops Cab (2/4)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***16 | Screw - Mounting | 4 |
| 01***03 | Nut,(With Joy Stick Steering) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Rops Cab (3/4)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***12 | Screw,(Additional Sun Visor) | 14 |
| 01***16 | Screw, Mount Parking Lights | 10 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Rops Cab (4/4)
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 2 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 8 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 12 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Rops Cab Mounting And Floor Mat
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***15 | Bolt | 10 |
| 01***40 | Bolt,(With Center Guard) | 8 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Steel Cab (1/4)
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Steel Cab (2/4)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***08 | Screw - Holder | 12 |
| 01***16 | Screw, Mount Parking Lights | 6 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Steel Cab (3/4)
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Steel Cab (4/4)
| 01***12 | Bolt,(With Cylinder Cover) | 8 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 8 |
Komatsu : Wa40-1(S/N 1001-Up) : Frame And Guard : Working Lamp
| 01***16 | Bolt (Op) | 7 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 7 |
| 08***00 | Lamp Ass'Y,Working | 3 |
Mark Plate? Tool And Kit
Komatsu : Wa40-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Marks And Plates (English)
| 09***35 | Plate? Name,(Limited Supply) (English) | 2 |
| 09***61 | Plate? Instruction,Air Cleaner (Single Element) | 1 |
| 09***00 | Plate? Caution,Fuel Tank Water Drain | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Spare Parts (Except Japan)
| 04***48 | V-Belt,(For 50a? 75a Alternator) | 1 |
| 07***00 | O-Ring,(For Dual Water Pump) | 1 |
| 07***28 | O-Ring,(For Hd325-6?Hm400-1) (A2110) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Mark Plate? Tool And Kit : Tool (Except Japan)
| 07***60 | Tube,Rear Axle Oil | 1 |
| 07***00 | Pump,Grease | 1 |
| 07***03 | Cartridge - Grease | 1 |
Special Application Parts
Komatsu : Wa40-1(S/N 1001-Up) : Special Application Parts : Bucket (For Multi Coupler) (0.5m3)
| 02***60 | Bolt (Op) | 14 |
| 02***15 | Nut (Op) | 14 |
| 04***64 | Pin,Snap (Welded) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Special Application Parts : Bucket (For Multi Coupler) (1.0m3)
| 04***64 | Pin,Snap (Welded) | 2 |
| 36***60 | Edge (Welded) | 1 |
| 36***10 | Bracket | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Special Application Parts : Multi Coupler
| 01***95 | Bolt,(For 2nd Travel Speed) (Op) | 3 |
| 01***11 | Nut,(Not Shown) | 3 |
| 04***64 | Pin,Snap (Welded) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Special Application Parts : Multi Purpose Bucket
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 10 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Special Application Parts : Multi Purpose Bucket Cylinder
| 07***60 | O-Ring,(For Pc750?800?1800) (A2610) | 1 |
| 07***55 | O-Ring,(F4350-62a1 -14 ) | 1 |
| 07***55 | Ring,Back-Up? Cylinder Head | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Special Application Parts : Utility Fork? With Grapple (For Multicoupler)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
Steering And Control System
Komatsu : Wa40-1(S/N 1001-Up) : Steering And Control System : Steering Cylinder
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 1 |
| 01***36 | Wahser-Spring, Washer,Spring (Without Towing Winch) | 1 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Steering And Control System : Steering Handle
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***10 | Nut,(Fig.F2820-01a3-12) | 1 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Steering And Control System : Steering Piping (1/2)
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Steering And Control System : Steering Piping (2/2)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Steering And Control System : Steering Pump (Except Japan)
| 01***60 | Bolt | 4 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 4 |
| 04***20 | Pin,Dowel (Welded) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Steering And Control System : Steering Valve
| 36***20 | Steering Valve Ass'Y | 1 |
| JK***28 | O-Ring (Kit) | 4 |
| JK***02 | Ball,Steel | 1 |
Transmission
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : 1st And 2nd Housing
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***45 | Screw | 10 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Forward And 3rd Housing
| 04***12 | Pin, Spring | 6 |
| 07***10 | O-Ring,(F4310-54a0 -16 ) | 5 |
| 07***12 | O-Ring,(F4350-59a1 -17 ) | 5 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Inching Pedal
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,Stopper | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 3 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Modulation Valve
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***30 | Bolt,(Cold Terrain Spec.) | 12 |
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Reverse Housing
| 01***30 | Bolt,(Not Used With Emergency Str.) | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 04***20 | Pin,Dowel (Welded) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Selector And Inching Valve
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 8 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Transfer
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Transmission Case
| 01***50 | Bolt (Kit) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 12 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Transmission Control Lever
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 5 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Transmission Lock Lever
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Transmission Oil Piping
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***11 | Nut,(With Under Mirror) | 6 |
Komatsu : Wa40-1(S/N 1001-Up) : Transmission : Transmission Pump
| 01***60 | Bolt,(For Japan And Sweden) | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 8 |
| 07***85 | O-Ring,(Without Fuel Level Gauge) | 1 |
Work Equipment
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment : Bucket
| 01***95 | Bolt,(For 2nd Travel Speed) (Op) | 3 |
| 01***11 | Nut,(Not Shown) | 3 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 7 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment : Lift Arm
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 20 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 20 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 10 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment : Lumber Fork
| 01***95 | Bolt,(For 2nd Travel Speed) (Op) | 3 |
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 4 |
| 01***11 | Nut,(Not Shown) | 3 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment : Lumber Fork (For Multi Coupler)
| 01***30 | Bolt-Hex, Bolt,(With Center Guard) | 4 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 4 |
| 04***20 | Spring Pin | 2 |
Work Equipment Control System
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Bucket Control Lever
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 3 |
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Dump Cylinder
| 01***09 | Nut,(With Body Positioner) | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Control Valve (1/2)
| 01***16 | Bolt (Op) | 4 |
| 01***25 | Bolt, Seal Cover Mounting | 2 |
| 01***30 | Bolt | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Control Valve (2/2)
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Filter
| 01***20 | Bolt,(Large Capacity Type) (Std) | 3 |
| 01***32 | Washer,(With Auto Emergency Steering) | 3 |
| 07***34 | O-Ring, At Transmission Filter | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Tank To Pump To Valve)
| 01***16 | Bolt (With Air Heater & Conditioner) | 4 |
| 01***35 | Bolt,(For Position Fixing) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Valv To Lift Cylinder)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 1 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Oil Piping (Valv To Pump Cylinder)
| 01***60 | Bolt, Mount Tube To Switch Pump | 1 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 1 |
| 07***34 | O-Ring,(For Without Brake Assistor) | 2 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Pump (Except Japan)
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Hydraulic Tank
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***35 | Bolt | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
Komatsu : Wa40-1(S/N 1001-Up) : Work Equipment Control System : Lift Cylinder
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***09 | Nut,(With Body Positioner) | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 1 |
WA40-1(S/N 1001-UP) serial number reference
The serial plate on a Komatsu WA40-1 wheel loader is located on the front frame, on the right-hand side of the articulation joint. The prefix is the first two letters of the model designation (WA) followed by the dash-number generation (-1), with the serial number following immediately after.
| Prefix | Identifies | Notes |
|---|---|---|
| WA40-1 | Wheel Loader | Series 1 generation. Serial range 1001-UP. Engine: 4D95L-W-1A. Older WA40-1 units typically use the model+serial format (e.g., WA40-1 #1001) rather than the 17-character ISO PIN found on later export models. |
Frequently asked questions
What engine does the Komatsu WA40-1 (S/N 1001-UP) use?
The Komatsu WA40-1 (S/N 1001-UP) is equipped with the Komatsu 4D95L-W-1A diesel engine.
What is the operating weight of the Komatsu WA40-1?
The operating weight of the Komatsu WA40-1 is approximately 3.4 tons (3,400 kg), varying slightly by configuration and attachment.
What model replaced the Komatsu WA40-1?
The Komatsu WA40-2 (S/N 3001-UP) succeeded the WA40-1, followed by the WA40-3 series.
What WA40-1(S/N 1001-UP) owners discuss
What engine model is installed in the Komatsu WA40-1 (S/N 1001-Up)?
The Komatsu WA40-1 (S/N 1001-Up) is equipped with the 4D95L-W-1A engine. This four-cylinder diesel unit provides 72 hp gross power and has a displacement of 264 cu in (4.3 L). The engine is part of the 4D105 series family, though the specific WA40-1 application uses the 4D95L-W-1A designation. Variations in emissions packages or regional configurations may alter specific component details, but the core engine model remains consistent for this serial range.
What are the known powertrain and hydraulic behaviors for the WA40-1?
The WA40-1 utilizes a Torqflow countershaft soft-shift transmission with three forward and three reverse gears. Maximum travel speed is 34.6 km/h (21.5 mph) forward and 34.1 km/h (21.2 mph) reverse. Common hydraulic issues include loss of drive after 1–2 minutes of operation, often linked to degraded transmission oil or torque converter clutch slippage. Hydraulic systems may exhibit weakness when hot due to internal pump or valve leakage as viscosity drops. Adding aftermarket attachments often requires verifying spool valve compatibility and hydraulic flow rates to avoid pressure drops or flow restrictions.
What undercarriage and wear patterns are typical for this machine type?
The WA40-1 is a wheeled loader with a wheelbase of 2.44 m (8.01 ft) and a width over tires of 2.22 m (7.29 ft). Standard tire size is 16.9-24-10PR (L2). Wear patterns typically involve front axle pivot pins, steering cylinder seals, and tire wear due to the articulated steering design. The machine’s operating weight is 6,429 kg (14,175.8 lb), with a static tipping weight of 4,929 kg (10,868.8 lb). Undercarriage wear is less relevant than for crawlers, but tire condition and rim integrity are critical. Bucket breakout force is rated at 58.1 kN (13,070 lb).
What are the common electrical or sensor issues reported for the WA40-1?
The WA40-1’s electrical system is prone to intermittent starting, dashboard failures, and random shutdowns, often caused by faulty sensors or unstable power supply. Grounding issues at the engine and chassis can lead to erratic sensor readings. The power beyond port for auxiliary hydraulics may require specific kits for proper electrical and hydraulic integration. Battery state of charge and terminal integrity are critical, as voltage collapse during cranking can mimic starter failure. Have your dealer verify the electrical grounding points and sensor calibration.
What fluid specifications and capacities should be used for the WA40-1?
The WA40-1 requires Komatsu Genuine Lubricants or equivalents meeting Komatsu Engineering Standards. Engine oil should meet API CD or later specifications. Hydraulic oil should be ISO VG46 or Komatsu HO. Axle oil should be SAE 80WZF or Komatsu AXO80. Powertrain oil should be SAE 10W or Komatsu TO10. Coolant should be Super Coolant AF-NAC. Fluid capacities vary by configuration: fuel capacity is 117 L (31 gal), cooling system fluid capacity is 32.2 L (8.5 gal).
What is the operating weight and tipping capacity of the WA40-1?
The operating weight of the Komatsu WA40-1 is 14,175.8 lb (6,429 kg). The static tipping weight is 10,868.8 lb (4,929 kg). These values are for the base unit and may vary with options such as counterweights, attachments, or regional emissions packages. The maximum discharge height is 2.47 m (8.1 ft), and the bucket capacity is 1.57 cu yd (1.20 m³). Have your dealer verify the exact weight and tipping capacity for your specific configuration.
What should be checked when buying a used WA40-1 (S/N 1001-Up)?
When purchasing a used WA40-1, verify the engine model (4D95L-W-1A) and serial number range (1001-Up). Check for transmission oil condition and level, as degraded oil can cause drive loss. Inspect hydraulic hoses and fittings for leaks, especially around the power beyond port. Test all hydraulic functions cold and hot to identify internal leakage. Check the battery, starter, and grounding points for electrical issues. Verify tire condition and rim integrity. Ensure the cooling system is clean and free of debris. Have your dealer verify the machine’s specific configuration and service history.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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