Komatsuwheel loadermedium (wa140 - wa380)
Komatsu WA380-5H(S/N H50051-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu WA380-5H (S/N H50051-UP) is a mid-size wheel loader designed for versatile earthmoving, quarrying, and material handling. This series features the SAA6D114E-2 engine, providing approximately 140 kW (187 HP) at 2,000 rpm. The machine operates within an 18 metric ton (approx. 39,683 lb) weight class and is configured with a high-efficiency hydraulic system and a multi-shaft transmission. It serves as a predecessor to the refined WA380-6 and WA380-8 series.
Across generations, the WA380 lineage transitioned from conventional power systems to advanced closed-centre load sensing (CLSS) hydraulics and hydrostatic transmissions in later models like the WA380-8. The WA380-5H remains a critical asset in the used market due to its balance of durability and parts availability. Its integration with KOMTRAX telematics and the Komatsu CARE service ecosystem provides fleet managers with essential data on fuel consumption, fault codes, and maintenance scheduling, maintaining high resale value.
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 WA380-5H(S/N H50051-UP) specifications
Engine
| Model | SAA6D1143-2 |
| Net Power | 140 kW (187 hp) @ 2,000 rpm |
Weights
| Operating Weight | 38,007.7 lb (17,240 kg) |
| Static Tipping Weight | 30,192.4 lb (13,694 kg) |
Dimensions
| Length With Bucket On Ground | 27.4 ft (8.35 m) |
| Height To Top Of Cab | 11.09 ft (3.38 m) |
| Wheelbase | 10.83 ft (3.3 m) |
| Ground Clearance | 1.28 ft (0.39 m) |
| Reach At Max Lift And Dump | 4.29 ft (1.31 m) |
| Dump Clearance At Max Raise | 9.04 ft (2.76 m) |
Performance
| Max Speed - Forward | 21.2 mph (34.1 km/h) |
| Max Speed - Reverse | 21.8 mph (35.1 km/h) |
Service capacities (summary)
| Fuel Tank | 79.3 gal (300 L) |
| Hydraulic System | 186 L (49.1 gal) |
| Transmission Case | 62 L (16.4 gal) |
| Engine Oil Pan | 37 L (9.8 gal) |
| Radiator (without coolant) | 77 L (20.3 gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
WA380-5H(S/N H50051-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 37 L (9.8 US gal) to 42 L (11.1 US gal) | Engine oil; SAE 30 for -30°C to -20°C; SAE 10W for -20°C to -10°C; SAE 10W-30 for -10°C to 0°C; SAE 15W-40 for 0°C to 50°C (per shop manual for WA380H50051 and up) |
| Cooling system | 36 L (9.5 US gal) to 60.6 L (16 US gal) | Water Add antifreeze; varies by configuration/series |
| Fuel tank | 300 L (79.3 US gal) | Diesel fuel; ASTM D975 No. 2 |
| Transmission/powertrain compartments | 62 L (16.4 US gal) to 803 L (212.1 US gal) | SAE 10W; varies by configuration/series |
| Final drives (each) | 38 L (10 US gal) | Axle oil; see manual for specific grade based on temperature |
| Hydraulic system and tank | 171 L (45.2 US gal) to 186 L (49.1 US gal) | SAE 10W |
| Axles/differentials | 38 L (10 US gal) to 911 L (240.6 US gal) | Axle oil; varies by configuration/series |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu WA380-5H(S/N H50051-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 WA380-5H(S/N H50051-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA (Komatsu Oil Wear Analysis) at every major service interval to monitor wear metals like iron, copper, and lead. Regularly check hydraulic fluid particle counts for ISO cleanliness and inspect coolant for pH levels and SCA concentration. Use KOMTRAX telematics to track real-time fuel consumption and fault codes, allowing for proactive adjustments to engine oil changes—extending intervals up to 500 hours under normal conditions based on sampling results.
Corrective & Common Repairs
Monitor the compressor (reference 421-07-31221) and air conditioning units for operational failures. Inspect hydraulic hoses frequently for cracks or leaks to prevent pressure loss. If transmission performance degrades, check the torque converter and lockup clutch functionality. Ensure the turbo pre-cleaner is replaced when full to prevent engine power loss. Always verify that all replacement components meet factory specifications to maintain system integrity.
Overhaul & Rebuild Points
Major milestones include the 2,000-hour hydraulic oil change and the 4,000-hour comprehensive component evaluation. During rebuilds, focus on inspecting the transmission shafts, final drives, and differential gears. Evaluate the condition of the articulation pins and steering cylinders for excessive play. For high-hour machines, a full coolant flush and inspection of the turbocharger assembly are mandatory to prevent catastrophic engine or cooling system failure.
Seasonal & Environment Servicing
In dusty environments, prioritize cleaning air filter elements and inspecting the turbo pre-cleaner. During cold operations, ensure engine oil viscosity (SAE 10W/30 or 15W/40) is appropriate for ambient temperatures. For heavy-duty summer use, clean radiator fins to prevent overheating. Always drain water from the fuel separator daily in high-moisture regions to protect the fuel injection system and maintain engine performance.
WA380-5H(S/N H50051-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 600-311-8321 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 6114-71-6210 | Head, Fuel Filter | Fuel system service | Check fitment → |
| 6151-71-7201 | Filter Assembly, Fuel | Fuel system service | Check fitment → |
| 424-01-H2260 | Air Filter | Air intake service | Check fitment → |
| 6732-21-5530 | Cartridge, Engine Oil Filter | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
WA380-5H(S/N H50051-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E03 | Parking brake system error | Discrepancies in the parking brake system or connectivity/alignment issues with the lever | Inspect the lever's connectivity and alignment |
| E10 | Engine controller power failure or engine control drive system circuit malfunction | Engine stall due to power loss or circuit malfunction | Inspect ECM power connections, fuses, or ground wires |
| E11 | Engine control system failure | Reduction of output power to protect the engine | Check coolant temperature, oil pressure, and air filter |
| E15 | Engine sensor fault | Malfunction in temperature, fuel pressure, or oil pressure sensors | Verify sensor integrity and check interconnections |
| AA10NX | Air filter clogging | Obstructed air cleaner | Replace the air filter |
| CA451 | Common rail pressure sensor feedback value too high | Malfunction in the rail sensor or an actual overpressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| CA452 | Common rail pressure sensor feedback value too low | Sensor error or pressure drop in the common rail | Diagnose the fuel rail pressure sensor or pump lines |
| DGH2KB | Hydraulic oil temperature sensor short circuit | Electrical short in the hydraulic temperature sensor | Replace the temperature sensor |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
WA380-5H(S/N H50051-UP) attachments & work tools
Buckets & Ground Engaging Tools
Standard bucket capacities for this class range from 2.7 m³ (3.5 yd³) to 4.3 yd³ (3.3 m³). Available components include tooth systems, edges, blades, lip systems, shrouds, and bimetallic wear products.
Hydraulic Attachments & Work Tools
The machine supports auxiliary hydraulics for tools such as grapples or forks. The hydraulic system utilizes a closed-center load sensing system with a variable displacement piston pump to provide required flow.
Mounting & Control Systems
The unit is equipped with a quick coupler for efficient tool changes. An optional mono lever with integrated 3rd spool control allows thumb-operated management of auxiliary functions in continuous or proportional modes.
Operational Configurations & Options
Factory options include an adjustable bucket positioner that stores three horizontal settings to facilitate attachment changes. Additional configurations may feature a remote boom positioner and adjustable upper/lower boom kick-outs.
Protection & Guarding
Standard equipment includes a vandalism protection kit with padlocks for the battery box. The machine features rear full fenders and a radiator mask that can be swung up for maintenance access.
All WA380-5H(S/N H50051-UP) assemblies by section
Every catalogued assembly group for the Komatsu WA380-5H(S/N H50051-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
01 Engine, Engine Mounting
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 00 Maintenance Kit
| 07***00 | O-Ring (Kit) | 1 |
| 07***10 | O-Ring (Kit) | 1 |
| 07***34 | O-Ring,(F4350-59a0 -23 ) | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 01 Engine, Engine Mounting
| 01***50 | Capscrew | 8 |
| 01***50 | Bolt,(Spark Arrester Spec.) | 2 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 02 Cylinder Block And Attaching Parts
| 62***10 | Screw | 1 |
| 62***10 | Seal, O-Ring (M10-1.00) | 1 |
| 62***50 | Draincock (1/4 Nptf) | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 04 Crank Assembly
| 67***50 | Gear, Crankshaft | 1 |
| 67***20 | Washer, Plain (M12) | 8 |
| 67***30 | Bolt (M12x1.25x32) | 8 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 05 Cylinder Head And Attaching Parts
| 01***20 | Bolt,(Forwarded Individually Parts) | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 07***11 | Hose, Flexible | 5 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 07 Cylinder Head Cover, Attaching Parts
| 01***16 | Washer,Radio Controlled Slag Handling | 6 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
| 04***08 | Clamp, Hose | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 08 Timing Gear Case And Flywheel Housing
| 01***16 | Washer,Radio Controlled Slag Handling | 1 |
| 04***08 | Clip | 1 |
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 09 Engine Timing Gear
| 67***20 | Support, Camshaft Thrust | 1 |
| 67***60 | Bolt (M8x1.25x22) | 2 |
| 67***80 | Key, Plain Woodruff (4.0mm) | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 10 Engine Lubrication
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
| 07***16 | Gasket,Air Compressor Piping | 1 |
| 07***59 | Clamp - Drain Hose | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 14 Oil Filter
| 12***H1 | Compression Spring | 1 |
| 67***51 | Valve, Pressure Relief | 1 |
| 67***30 | Plug, Pipe (1/8 Nptf) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 15 Water Pump
| 67***60 | Bolt, Mounting (M8-1.25x25) | 2 |
| 67***20 | Seal (K2) | 1 |
| 67***30 | Water Pump Ass'Y | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 17 Fan, Belt Tensioner
| 01***30 | Bolt,(With Body Positioner) | 6 |
| 01***45 | Bolt,(With Water Separator Type) | 1 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 18 V-Belt Arrangement
| 01***90 | Screw | 4 |
| 19***40 | Bushing | 4 |
| 67***30 | Belt,Water Pump | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 19 Cooling System
| 01***12 | Bolt,(With Speedometer) | 1 |
| 01***05 | Nut (Welded) | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 20 Injection System
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 2 |
| 07***12 | Gasket,Injection Pump Piping | 3 |
| 07***90 | Hose - Fuel Return From Injection Pump | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 21 Injection Pump
| 01***85 | Screw | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 01***40 | Bolt,(Shim 3-Piece) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 26 Fuel Pump
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 07***14 | Screw, Banjo Connector (M10) | 1 |
| 07***09 | Clamp,(See Fig. K0210-16a0) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 27 Injection Pump Drive
| 67***60 | Seal, Rectangular Ring | 1 |
| 67***70 | Nut, Hex Flange (M10-1.50 Thd) | 4 |
| 67***20 | Stud (M10-1.50 (Both Ends)X42) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 28 Fuel System, Pre Filter
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 2 |
| 01***45 | Bolt, Bracket Mounting | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 30 Fuel System, Filter
| 01***50 | Stud Bolt | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 2 |
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 46 Air Intake System, Standard
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 2 |
| 01***09 | Nut,(For Japan) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 48 Turbocharger
| 07***67 | Clamp, Hose | 4 |
| 13***91 | Connection Ass'Y,Oil Drain | 1 |
| 13***H1 | Hose | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 49 Air Filter System, Standard
| 01***14 | Bolt - Fuel Sensor Mounting | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
| 01***40 | Bolt,(Shim 3-Piece) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 54 Air Cleaner
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 2 |
| 01***30 | Bolt, Mounting - Front Hand Rails | 4 |
| 01***08 | Nut,See Fig. K4010-04a0 | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 57 Exhaust System
| 01***85 | Bolt,(Used With Pin Puller) | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 6 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 01 Engine, Engine Mounting : 60 Engine Control
| 01***16 | Bolt - Box Mounting | 3 |
| 01***25 | Capscrew | 3 |
| 01***20 | Bolt,(For Mono Lever Steering) | 10 |
02 Cooling System
Komatsu : Wa380-5h(S/N H50051-Up) : 02 Cooling System : 73 Radiator
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 12 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 02 Cooling System : 74 Radiator Attaching Parts
| 01***20 | Bolt,(For Mono Lever Steering) | 10 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
| 01***10 | Bolt,(With Joy Stick Steering) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 02 Cooling System : 75 Hydraulic Oil Cooling
| 01***16 | Bolt - Box Mounting | 4 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 4 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 02 Cooling System : 77 Cooling Water Pipes
| 02***28 | Elbow | 2 |
| 02***18 | O-Ring,(F5350-63a0 -17 ) | 2 |
| 07***34 | O-Ring,(For 2-Actuater Attachment) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 02 Cooling System : 78 Engine Oil Cooling
| 01***12 | Bolt,(See Fig. K0210-16a0) | 4 |
| 01***23 | Washer,(With Auto Emergency Steering) | 1 |
| 12***H1 | Compression Spring | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 02 Cooling System : 79 Transmission Oil Cooling
| 01***20 | Bolt,(For Mono Lever Steering) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 2 |
03 Electric System
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 42 Alternator
| 01***30 | Bolt,(For Trimming Dozer) | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***55 | Bolt, Mount Dryer To Bracket And Frame | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 43 Startermotr
| 01***40 | Bolt,(For Operator'S Cab) | 2 |
| 01***10 | Nut, Plate Mounting | 1 |
| 60***10 | Starting Motor Ass'Y,(7.5kw) | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 56 Electric System, Lighting Unit
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 4 |
| 01***12 | Screw,(For Side Lamp) (Not Shown) | 2 |
| 01***16 | Screw,(For Joy Stick Steering) | 8 |
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 61 Electric System
| 01***20 | Bolt,(For Mono Lever Steering) | 7 |
| 01***32 | Washer,(With Auto Emergency Steering) | 7 |
| 04***10 | Clip,(With Accumulator) | 5 |
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 64 Instrument Box And Attaching Parts
| 01***16 | Bolt - Box Mounting | 4 |
| 01***16 | Screw,(With Payload Meter) | 8 |
| 01***23 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 66 Windshield-Wiper - Washer System
| 01***20 | Bolt,(Without Air Con. Or Heater) | 4 |
| 01***16 | Bolt - Seat And Tether Belt Mounting | 3 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 70 Turning Light
| 01***20 | Screw | 3 |
| 01***16 | Bolt, Mount Solenoid Valve | 4 |
| 41***10 | Bracket | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 71 Back Up Alarm
| 01***10 | Plain Washer | 8 |
| 14***30 | Harness, Wiring | 1 |
| 42***20 | Horn | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 74 Battery
| 01***50 | Bolt,(For D60pl) | 2 |
| 01***08 | Screw, Terminal | 3 |
| 01***10 | Screw,(For Lighter) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 03 Electric System : 75 Battery Main Switch
| 01***16 | Bolt - Box Mounting | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 01***05 | Nut,(For Air Conditioner Less), Nut | 2 |
04 Transmission, Universal Joint
Komatsu : Wa380-5h(S/N H50051-Up) : 04 Transmission, Universal Joint : 75 Universal Joint
Komatsu : Wa380-5h(S/N H50051-Up) : 04 Transmission, Universal Joint : 85 Powershift Transmission
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***40 | Bolt, Mount Retainer | 12 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 04 Transmission, Universal Joint : 88 Gears And Shafts
| 41***33 | Spring, Wave | 24 |
| 41***40 | Ring, Snpa | 2 |
| 71***10 | Plate, End | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 04 Transmission, Universal Joint : 92 Powershift Transmission, Control Valve
| 01***20 | Bolt,(Without Air Con. Or Heater) | 4 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 2 |
| 01***70 | Bolt - Bracket And Oil Inlet Tubemounting | 1 |
05 Rear Axle
Komatsu : Wa380-5h(S/N H50051-Up) : 05 Rear Axle : 43 Rear Axle
| 01***60 | Washer,(Without Rops Guard? Canopy) | 36 |
| 41***70 | Bolt, Mounting Rear Wheels | 36 |
| 42***01 | Axle Assembly, Rear | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 05 Rear Axle : 45 Differential
| 01***30 | Capscrew - M12 X 1.75 | 10 |
| 01***40 | Capscrew | 24 |
| 01***85 | Screw | 12 |
06 Disc Wheel, Chain
Komatsu : Wa380-5h(S/N H50051-Up) : 06 Disc Wheel, Chain : 77 Disc Wheel
| 41***03 | Circlip | 1 |
| 42***10 | Valve | 4 |
| 42***01 | Side Ring | 1 |
07 Steering
Komatsu : Wa380-5h(S/N H50051-Up) : 07 Steering : 00 Steering, Steering Mounting
| 01***16 | Bolt - Box Mounting | 4 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 07 Steering : 01 Steering Column
| 01***40 | Screw | 2 |
| 01***30 | Washer, Spring (Supplied W/Spider Assembly), Washer-Spring | 2 |
| 01***23 | Washer,(With Auto Emergency Steering) | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 07 Steering : 02 Steering Unit
| 41***30 | Cap, End | 1 |
| 41***60 | Plate, Spacer | 1 |
| 41***70 | Drive | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 07 Steering : 04 Steering Valve, Pipings
| 01***40 | Bolt (Op) | 4 |
| 01***50 | Bolt,(Spark Arrester Spec.) | 4 |
| 01***09 | Nut,(For Japan) | 8 |
Komatsu : Wa380-5h(S/N H50051-Up) : 07 Steering : 05 Steering, Pipings
| 01***20 | Bolt,(For Mono Lever Steering) | 5 |
| 01***60 | Bolt,(F4320-52a0 -5- ) | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 6 |
Komatsu : Wa380-5h(S/N H50051-Up) : 07 Steering : 06 Steering Cylinder And Pipings
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 02***05 | Hose | 2 |
| 02***A5 | Hose | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 07 Steering : 07 Steering Cylinder
| 07***85 | O-Ring,(For Snow Removing) | 1 |
| 07***90 | O-Ring,(Y1620-41a0a-11) | 1 |
| 07***23 | O-Ring,(F4350-66a1 -1c ) | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 07 Steering : 12 Valve Block
| 42***01 | Valve, Steering Stop | 2 |
| 42***30 | Poppet | 1 |
| 42***40 | Compression Spring | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 07 Steering : 15 Steering
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***60 | Bolt,(F4320-52a0 -5- ) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 6 |
08 Front Axle
Komatsu : Wa380-5h(S/N H50051-Up) : 08 Front Axle : 00 Front Axle
| 01***70 | Bolt,(North America Spec.) | 8 |
| 01***22 | Nut,(North America Spec.) | 8 |
| 01***60 | Washer,(Without Rops Guard? Canopy) | 36 |
Komatsu : Wa380-5h(S/N H50051-Up) : 08 Front Axle : 02 Differential
| 01***30 | Capscrew - M12 X 1.75 | 10 |
| 01***40 | Capscrew | 24 |
| 01***85 | Screw | 12 |
09 Brake System
Komatsu : Wa380-5h(S/N H50051-Up) : 09 Brake System : 00 Brake System
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 02***A4 | Hose | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 09 Brake System : 04 Brake Piping For Front And Rear Axle
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 09 Brake System : 05 Pressure Tank
10 Frame
Komatsu : Wa380-5h(S/N H50051-Up) : 10 Frame : 00 Front Frame
| 01***30 | Bolt,(Not Used When Towing Winch) | 1 |
| 01***32 | Washer,(Without Gps Antenna Bracket) | 1 |
| 04***65 | Pin,Spring (For Chinese) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 10 Frame : 01 Rear Frame
| 01***20 | Bolt,(For Mono Lever Steering) | 3 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 9 |
| 01***35 | Capscrew - M14 (1)/(2) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 10 Frame : 03 Hinge
| 01***95 | Screw | 4 |
| 01***50 | Bolt,For Weight Adjusting Bolt | 6 |
| 01***25 | Bolt, Pinlock | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 10 Frame : 06 Fender
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 6 |
| 01***30 | Bolt - Lower Oil Cooler Outlet Tubemounting | 2 |
| 42***60 | Plain Washer | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 10 Frame : 07 Radiator Guard
| 01***20 | Bolt,(For Mono Lever Steering) | 17 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***40 | Bolt (Op) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 10 Frame : 08 Bonnet
| 01***45 | Bolt,(With Water Separator Type) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***45 | Bolt, Mounting Cranking Motor | 3 |
Komatsu : Wa380-5h(S/N H50051-Up) : 10 Frame : 10 Boody Guard
| 01***20 | Bolt,(For Mono Lever Steering) | 6 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***35 | Screw | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 10 Frame : 14 Platform
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***65 | Bolt,(Without Rops) | 8 |
| 01***50 | Screw | 20 |
Komatsu : Wa380-5h(S/N H50051-Up) : 10 Frame : 16 Ladder
| 01***30 | Bolt,(Not Used When Towing Winch) | 9 |
| 01***16 | Bolt - Starting Motor Ground Cable | 3 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 9 |
11 Drivers Cab
Komatsu : Wa380-5h(S/N H50051-Up) : 11 Drivers Cab : 00 Safety Cabin : Unit_02_of_02
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 10 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 2 |
| 01***95 | Screw | 12 |
Komatsu : Wa380-5h(S/N H50051-Up) : 11 Drivers Cab : 00 Safety Cabin : Unit_01_of_02
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 10 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 2 |
| 01***95 | Screw | 12 |
Komatsu : Wa380-5h(S/N H50051-Up) : 11 Drivers Cab : 01 Safety Cabin, Doors : Unit_02_of_02
| 01***16 | Screw | 1 |
| 01***03 | Nut (Welded) | 1 |
| 01***05 | Washer,(Without Window Washer) | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 11 Drivers Cab : 01 Safety Cabin, Doors : Unit_01_of_02
| 01***12 | Bolt - Front Cover Mounting | 6 |
| 01***14 | Screw | 4 |
| 01***25 | Bolt,(Rear Attachment Less) | 8 |
Komatsu : Wa380-5h(S/N H50051-Up) : 11 Drivers Cab : 11 Soundproofing Of Cabin
| 01***16 | Bolt - Box Mounting | 2 |
| 01***20 | Screw,(Australia Spec.) | 4 |
| 01***23 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 11 Drivers Cab : 18 Heater
| 01***20 | Bolt,(For Mono Lever Steering) | 6 |
| 01***32 | Washer,(With Auto Emergency Steering) | 6 |
| 04***11 | Clip,See Fig. K4010-04a0 | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 11 Drivers Cab : 19 Air Conditioner
| 01***16 | Bolt - Box Mounting | 4 |
| 01***20 | Bolt,(Without Air Con. Or Heater) | 4 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 11 Drivers Cab : 27 Drivers Seat, Attaching Parts
| 02***19 | Bolt,Tether | 2 |
| 10***10 | Collar,Kab | 3 |
| 17***21 | Belt? Tether,Tether | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 11 Drivers Cab : 28 Drivers Seat
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
| 01***25 | Screw | 4 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
12 Tools, Accessory, Lettering
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 00 Wedge And Attachement
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
| 01***16 | Capscrew | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 02 Tools
| 09***06 | Wrench Set,8x10? 12x14? 13x17? | 1 |
| 09***00 | Wrench - Adjustable | 1 |
| 09***50 | Pliers | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 03 Lettering
| 09***00 | Plate? Mark,Komatsu? Rear | 2 |
| 09***30 | Plate? Mark,Mark? Galeo | 2 |
| 42***30 | Plate | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 04 Decals, German
| 09***00 | Tag,Do Not Operate (German) | 1 |
| 41***20 | Caution Plate | 2 |
| 42***20 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 05 Decals, English
| 09***00 | Tag,(For South And North America) | 1 |
| 42***70 | Decal | 1 |
| 42***60 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 06 Decals, French
| 42***10 | Caution Plate | 1 |
| 42***30 | Decal | 1 |
| 42***80 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 08 Decals, Italian
| 42***10 | Caution Plate | 1 |
| 42***30 | Decal | 1 |
| 42***80 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 09 Decals, Spanish
| 42***10 | Caution Plate | 1 |
| 42***40 | Decal | 1 |
| 42***80 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 10 Decals, Swedish
| 42***10 | Caution Plate | 1 |
| 42***50 | Decal | 1 |
| 42***90 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 11 Decals, Danish
| 42***30 | Caution Plate | 1 |
| 42***70 | Decal | 1 |
| 42***10 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 12 Decals, Finnish
| 42***70 | Caution Plate | 1 |
| 42***60 | Decal | 1 |
| 42***00 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 13 Decals, Norwegian
| 42***50 | Caution Plate | 1 |
| 42***40 | Decal | 1 |
| 42***80 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 14 Decals, Dutch
| 42***10 | Caution Plate | 1 |
| 42***00 | Decal | 1 |
| 42***40 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 15 Decals, Portuguese
| 42***90 | Caution Plate | 1 |
| 42***80 | Decal | 1 |
| 42***20 | Decal | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 12 Tools, Accessory, Lettering : 16 Decals, Greek
| 42***50 | Caution Plate | 1 |
| 42***90 | Decal | 1 |
| 42***30 | Decal | 1 |
13 Hydraulic System
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 00 Pumps For Hydraulic System
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***45 | Bolt, Mounting Cranking Motor | 4 |
| 01***00 | Bolt,For Weight Adjusting Bolt | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 01 Hydraulic System
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 03 Hydraulic-Pump
| 70***00 | Pump Assembly (Sal80) | 1 |
| 70***70 | Pump Assembly, Work Equipment(Sal90) | 1 |
| 70***40 | Pump Assembly, (Sal20) P.P.C | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 06 Oil Tank
| 01***30 | Bolt,(With Body Positioner) | 2 |
| 01***40 | Bolt (Op) | 4 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 3 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 09 Remote Control Valve
| 01***20 | Bolt,(For Mono Lever Steering) | 3 |
| 01***60 | Bolt,(F4320-52a0 -5- ) | 1 |
| 01***35 | Screw | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 10 Pressure Pipings To Control Valve
| 01***30 | Screw | 2 |
| 01***35 | Screw | 4 |
| 01***45 | Screw | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 11 Control Valve, Return Pipings
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 12 Control Valve
| 01***55 | Bolt - Mount Cage To Transmission Case | 4 |
| 01***95 | Capscrew - M12 | 3 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 7 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 13 Valve Block
| 07***10 | O-Ring | 1 |
| 42***10 | Compression Spring | 1 |
| 42***20 | Plug | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 25 Lift Cylinder And Pipings
| 01***70 | Bolt - Bracket And Oil Inlet Tubemounting | 4 |
| 01***50 | Bolt,For Weight Adjusting Bolt | 4 |
| 01***40 | Screw | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 26 Lift Cylinder
| 01***30 | Bolt - Pin Mounting | 4 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 2 |
| 07***00 | Fitting, Grease (Steering Cylinder) | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 27 Bucket Cylinder And Pipings
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***20 | Capscrew | 2 |
| 01***35 | Screw | 8 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 28 Bucket Cylinder
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***30 | Bolt - Pin Mounting | 2 |
| 01***35 | Screw | 4 |
Komatsu : Wa380-5h(S/N H50051-Up) : 13 Hydraulic System : 40 Pipings For Accessory Equipment
| 01***35 | Screw | 32 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 8 |
| 01***45 | Bolt, Bracket Mounting | 4 |
14 Boom, Thrust Frame - Arm
Komatsu : Wa380-5h(S/N H50051-Up) : 14 Boom, Thrust Frame - Arm : 00 Boom
| 07***00 | Fitting, Grease - Upper Hinge Pin | 2 |
| 07***00 | Fitting, Grease (Steering Cylinder) | 1 |
| 42***10 | Seal,Dust (Kit) | 8 |
15 Equipment
Komatsu : Wa380-5h(S/N H50051-Up) : 15 Equipment : 00 Bucket
| 42***10 | Skid | 4 |
| 42***50 | Skid | 4 |
| 42***12 | Bucket | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 15 Equipment : 02 Quick Change Device
| 01***20 | Bolt,(For Mono Lever Steering) | 16 |
| 01***32 | Washer,(With Auto Emergency Steering) | 14 |
| 42***21 | Pin Ass'Y | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 15 Equipment : 04 Fork Lift
| 01***80 | Screw | 2 |
| 42***03 | Prongs | 2 |
| 42***05 | Carrier | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 15 Equipment : 10 Ripper Tooth Wear Plate And Marker Light
| 01***70 | Bolt, Mount Bracket And Oil Inlet Tube, Bolt | 2 |
| 01***16 | Screw,(P.O.C. Model) (Except Japan) | 4 |
| 01***50 | Wing Nut | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 15 Equipment : 12 Bucket Position Indicator
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 15 Equipment : 30 Electric System, For Vehicles With Joystick
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 04***10 | Clip | 2 |
Komatsu : Wa380-5h(S/N H50051-Up) : 15 Equipment : 70 Central Lubrication
| 01***20 | Bolt,(For Mono Lever Steering) | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 8 |
| 04***10 | Clip - Fuel Sensor Harness | 12 |
Komatsu : Wa380-5h(S/N H50051-Up) : 15 Equipment : 76 Counterweight
| 01***90 | Screw | 4 |
| 22***80 | Washer, Mount | 4 |
| 42***10 | Chain | 1 |
Komatsu : Wa380-5h(S/N H50051-Up) : 15 Equipment : 89 Special Equipment Italy
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Screw | 4 |
| 01***16 | Screw, Mount Parking Lights | 4 |
Frequently asked questions
What engine is installed in the WA380-5H?
The machine is equipped with a Komatsu SAA6D114E-2 engine.
What is the operating weight of this loader?
The operating weight for this series is approximately 18 metric tons (39,683 lb).
What model replaced the WA380-5 series?
The WA380-6 and subsequent WA380-8 models succeeded this generation.
What WA380-5H(S/N H50051-UP) owners discuss
What are the common hydraulic performance issues observed when the machine is operating at high temperatures?
Operators may notice increased internal leakage or relief valve bypass as hydraulic oil viscosity decreases when hot. This can manifest as weak hydraulic functions specifically during warm operation, even if the system performs normally when cold.
What engine model is used in the Komatsu WA380-5H (S/N H50051-UP)?
The machine is equipped with a SAA6D114E-2 engine, which is a 6-cylinder, direct injection, water-cooled type featuring a supercharger and air cooling aftercooler.
What should be checked if the engine loses power specifically when performing heavy digging or loading tasks?
Inspect for airflow restrictions in the air filters, check fuel filter condition, verify fuel tank venting, and examine intake and charge-air hoses for loose clamps or damage. It is critical to determine if the engine RPM drops under load (indicating an engine issue) or if engine speed remains normal while hydraulic movements weaken (indicating a hydraulic system issue).
What are the typical maintenance requirements for the cooling system on this model?
Regularly inspect the radiator, hydraulic oil cooler, and charge-air cooler for debris or dust buildup between stacked coolers. Ensure coolant levels are checked when cold. If temperature rises during heavy work but falls during idling, the cooling capacity may be marginal due to external contamination.
What electrical or sensor issues can cause sudden machine shutdowns or warning signals?
The machine relies heavily on electronic control systems; therefore, a single faulty sensor or an unstable power supply can trigger multiple warning signals. Common symptoms include intermittent starting, dashboard failures, or random shutdowns.
What is the primary recommendation when inspecting a used WA380-5H (S/N H50051-UP) for purchase?
Verify the exact serial-prefix specification sheet and the installed attachment package. Confirm that all hydraulic, engine, and transmission components have been serviced according to Komatsu maintenance intervals and check for any history of transmission shifting failures or hydraulic system lockups.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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