Komatsuwheel loadersmall ( - wa120 / sk*)
Komatsu WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu WA90-3 and WA95-3 are compact wheel loaders in the sub-6-tonne class, built for yard, landscape, municipal, and light construction loading work. Both carry the Komatsu S4D98E-2 turbocharged four-cylinder diesel (factory-equivalent to a Yanmar 4TNV98T block), mechanically governed with no electronic control module: the WA90-3 is rated 51.5 kW (70 PS) net, the WA95-3 55 kW (74.8 PS) net. Operating weight runs about 5.61 t (5,610 kg / 12,368 lb) for the WA90-3 and about 6.02 t (6,020 kg / 13,272 lb) for the WA95-3. Drive is through Komatsu's HST (hydrostatic) transmission, with axial-piston pump and motor units driving the front and rear axles. The -3 series ran roughly 1998 to 2005; this H20319-UP (WA90-3) and H20672-UP (WA95-3) serial block covers a later production run within that window. No earlier generation under this exact WA90/WA95 nameplate is documented, so the -3 series is the earliest widely cataloged generation; it was succeeded by the WA90-5 (roughly 2005-2008) and later the WA90-6 (roughly 2008-2017), while no later WA95 generation is documented under that nameplate. The factory lineup covers general-purpose, light-material, stockpile, high-dump, side-dump, and skeleton buckets plus a fork carrier and sweeper, all through a 4-point hydraulic quick coupler with an optional third hydraulic circuit for powered tools.
Within this -3 generation, the H20319-UP (WA90-3) and H20672-UP (WA95-3) serial block is a later running-production block, following an earlier serial run within the same -3 generation; what specifically changed in production at this exact breakpoint is not documented in public parts references. The WA90-3 tops out at 30 km/h (18.6 mph) and the WA95-3 at 20 km/h (12.4 mph) on different final-drive gearing - always confirm the exact serial number before sourcing driveline components. In the used and parts market, this size class holds steady demand from landscaping, agriculture, snow-removal, and municipal yard fleets that need a loader small enough for tight sites but still hydrostatic-driven for smooth single-lever control rather than skid-steer simple. The mechanically governed engine and hydrostatic driveline, with no ECM and no digital diagnostics to lean on, make these loaders straightforward to keep running well past the original dealer network, which is why well-maintained examples stay in active rotation long after -3 series production ended.
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 WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) specifications
Engine
| Engine model | Komatsu S4D98E-2, turbocharged direct-injection 4-cylinder diesel (factory-equivalent to the Yanmar 4TNV98T block), fitted to both the WA90-3 and WA95-3 in this serial range. |
| Net power - WA90-3 | 51.5 kW / 70 PS (approx. 69 hp) |
| Net power - WA95-3 | 55 kW / 74.8 PS (approx. 75 hp) |
| Displacement | Approx. 3.3 L (3,319 cc); bore x stroke approx. 98 x 110 mm |
| Cylinders | 4, inline, water-cooled, turbocharged |
| Emissions tier | Certified to the non-road diesel emissions standard current for this power class at time of build (late-1990s to early-2000s EU Stage I / US EPA Tier 1 era). Exact certification tier is not published for this serial range - verify with your dealer. |
Weights
| Operating weight - WA90-3 | 5.61 t (5,610 kg / 12,368 lb) |
| Operating weight - WA95-3 | 6.02 t (6,020 kg / 13,272 lb) |
| Tipping load, full turn - WA90-3 | 3.44 t (3,440 kg / 7,584 lb) |
| Tipping load, full turn - WA95-3 | 3.75 t (3,750 kg / 8,267 lb) |
| Static tipping load, straight - WA95-3 | Approx. 4.86 t (4,860 kg / 10,715 lb) per published spec chart; equivalent straight-line figure not found for the WA90-3. |
Dimensions
| Transport length - WA90-3 | 5.60 m (18.4 ft) |
| Transport length - WA95-3 | 5.58 m (18.3 ft) |
| Transport width - WA90-3 | 2.10 m (6.9 ft), over bucket |
| Transport width - WA95-3 | 2.15 m (7.1 ft), over bucket |
| Transport height - WA90-3 | 2.72 m (8.9 ft) |
| Transport height - WA95-3 | 2.74 m (9.0 ft) |
| Wheelbase | Approx. 2.15-2.16 m (7.1 ft), shared chassis platform for both models |
| Ground clearance - WA90-3 | 0.48 m (1.6 ft) |
| Ground clearance - WA95-3 | Approx. 0.52 m (1.7 ft) |
| Turning radius, outside (articulated) | Approx. 4.44-4.46 m (14.6 ft) for both models |
Performance
| Max travel speed - WA90-3 | 30 km/h (18.6 mph) |
| Max travel speed - WA95-3 | 20 km/h (12.4 mph); the two models carry different final-drive gearing on the hydrostatic transmission |
| Bucket breakout force | Approx. 72.5-74 kN (16,300-16,600 lbf), shared loader-linkage design |
| Bucket capacity, heaped | 0.9-1.6 m3 (1.2-2.1 cu yd) depending on bucket option; standard bucket approx. 1.0 m3 on the WA90-3 and 1.1 m3 on the WA95-3 |
| Bucket raise time | Approx. 5.7 sec |
| Bucket dump time | Approx. 1.1 sec |
| Dump clearance at max raise | Approx. 2.72-2.74 m (8.9-9.0 ft) |
Service capacities (summary)
| Fuel tank | 130 L (34.3 US gal) |
| Hydraulic system (steering, attachment, and HST motive-power circuit) | 94.0 L (24.8 US gal) |
| Engine oil (crankcase, with filter) | 12.5 L (3.3 US gal) |
| Cooling system | 17.0 L (4.5 US gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with oil filter) | 12.5 L (3.3 US gal) | Komatsu Genuine engine oil (EO). Select viscosity by ambient temperature per the OMM chart: EO10W-30 for cold-weather starts, EO15W-40 for general/temperate service, EO30 for sustained hot-climate operation. Meets API CI-4/CH-4 or Komatsu's own engine-oil spec. |
| Cooling system | 17.0 L (4.5 US gal) | Komatsu Supercoolant AF-NAC, an ethylene-glycol permanent-type antifreeze and corrosion inhibitor. Mix ratio follows regional freeze-protection needs (typical 50/50 water-coolant blend); confirm the exact freeze-point chart for this serial range with the dealer before extreme-cold service. |
| Fuel tank | 130 L (34.3 US gal) | Diesel fuel meeting the engine's emissions-tier spec (low-sulfur diesel where regionally required); no separate fuel additive called out in the fluid chart. |
| Hydraulic system - steering, attachment, and HST motive-power circuit, incl. tank | 94.0 L (24.8 US gal) | Komatsu Genuine hydraulic oil (HO). Standard grade ISO VG46; drop to a lighter ISO VG32 for cold-climate startup or step up to ISO VG68/100 for sustained hot-climate duty. The loader's hydrostatic transmission draws from this same circuit and tank, so the chart carries no separate transmission-oil line. |
| Front axle & differential | 6.5-6.8 L (1.7-1.8 US gal) | Komatsu Genuine axle oil (AXO) or an equivalent GL-5 gear oil, SAE 80W-90; use the limited-slip additive package if the differential option calls for it. |
| Rear axle & differential | 11.0-11.4 L (2.9-3.0 US gal) | Komatsu Genuine axle oil (AXO) or an equivalent GL-5 gear oil, SAE 80W-90, same spec as the front axle. |
| Grease - chassis lubrication points | Spec only, no reservoir capacity | Komatsu Genuine grease (G2-LI), a lithium-base multipurpose EP grease, for all pin, pivot, and bearing grease points. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
The S4D98E-2 has no ECM, so there are no digital fault codes on this loader - fluid sampling is the real early-warning system. Pull engine oil and hydraulic oil samples (the same circuit that feeds the HST drive) at each 250-hour service to catch pump/motor wear, turbo bearing wear, or injector drift before it shows up as weak response or smoke. Track coolant concentration given the shared front/rear axle driveline on this chassis. Watch the analog gauge cluster and warning lamps closely; they're the only onboard alert this platform has.
Corrective & Common Repairs
Sluggish or weak forward/reverse response on the HST drive is the top complaint on this loader; check hydraulic fluid condition and change the filter before condemning the pump or motor. Cold, thick hydraulic oil also causes sluggish steering and lift response on startup - idle and cycle the loader arm before loading. Center articulation joint and front axle king-pin play are the next wear points, worsened by tight-radius scoop-and-carry work. The wiring harness crossing the articulation joint chafes over time and is the usual source of intermittent gauge or light faults.
Overhaul & Rebuild Points
At overhaul hours, the HST charge pump and the main axial-piston pump and motor are the first driveline items to rebuild once response stays weak after a fluid service. Check center articulation bushings and front axle king pins for play at the same time; both flex constantly on this size loader and wear together. On the S4D98E-2, milky oil or fouled coolant signals a head gasket job. Have the turbocharger and injection pump bench-tested and rebuilt together once smoke or power loss appears, since both age at a similar rate.
Seasonal & Environment Servicing
Match engine oil and hydraulic oil grade to the season per the OMM chart - EO10W-30 and lighter ISO VG32 hydraulic oil for cold starts, EO30 and ISO VG68/100 for sustained heat. Check the coolant's freeze-point concentration before winter; a weak mix leaves this small cooling system vulnerable. In dusty, dry-site work, shorten the air-filter cleaning interval well below the standard 250-hour mark. In wet or humid climates, drain the fuel water separator daily rather than at the standard 500-hour service to protect the injection system.
WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 42U-01-13170 | Air Filter | Air intake service | Check fitment → |
| 42U-01-H0P01 | Filter Element | Scheduled service item | Check fitment → |
| 42U-01-H0P02 | Filter Element | Scheduled service item | Check fitment → |
| 42U-62-13150 | Filter Element | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Engine oil pressure warning light (red lamp) | Engine oil pressure has dropped below the safe minimum | Low oil level, clogged oil filter, worn oil pump, or a failed pressure switch | Stop the engine immediately, check oil level, inspect for leaks and filter condition before restarting |
| Charging current warning light (red lamp, battery symbol) | Alternator is not charging the battery | Loose or broken fan/alternator belt, failed alternator, or a loose/corroded wiring connection | Stop and check belt tension and wiring; do not keep operating with the lamp lit |
| Air filter warning light (red lamp, filter symbol) | Air cleaner element is clogged, restricting intake airflow | Dust and debris buildup in the paper element from dry or dusty jobsite conditions | Stop the engine, clean or replace the air filter element, then confirm the light clears |
| Brake fluid warning light (red lamp) | Brake fluid reservoir level is too low | Fluid leak in the brake circuit or worn brake components consuming fluid | Stop the machine right away, check fluid level, and inspect brake lines and reservoir for leaks before resuming work |
| Parking brake warning light | Indicates the parking brake is applied, or flags a fault in the parking brake sensing circuit | Parking brake lever left engaged, or a faulty brake switch/wiring if the lamp stays on with the brake released | Confirm parking brake lever position; if the lamp remains lit with the brake released, check the switch and wiring |
| Coolant temperature gauge in the high/red zone | Engine coolant temperature has exceeded the normal operating range | Low coolant level, clogged radiator fins, worn thermostat, or a slipping fan belt under heavy load | Reduce load and idle the engine, then shut down, let it cool, and check coolant level and radiator for blockage |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) attachments & work tools
General-purpose bucket
Standard heaped bucket capacity is about 1.0 m³ (1.3 cu yd) on the WA90-3 and about 1.1 m³ (1.4 cu yd) on the WA95-3, with bucket width around 2.1-2.15 m (6.9-7.1 ft). Optional general-purpose buckets across this compact-loader class range up to about 1.6 m³ (2.1 cu yd) heaped.
Special-purpose buckets
The factory lineup for this size class also includes light-material, stockpile, high-dump, side-dump, muck/mulch-grab, and skeleton (drainage) buckets alongside the standard GP bucket. All share the same coupler mount as the standard bucket, so no separate linkage change is needed to swap between them.
Pallet forks / fork carrier
A fork carrier with tines is offered for palletized or bagged material handling, sized to this loader's 5.6-6.0 t operating-weight class. Forks mount through the same quick-coupler interface as the buckets.
Coupler / mounting system
Standard fitment is a hydraulic 4-point (4-pin) quick coupler with a positive mechanical lock, allowing tool changes from the operator's seat. Class literature describes the coupler as usable with tools built to the same industry coupler pattern, not only factory Komatsu buckets and forks.
Auxiliary hydraulics (3rd circuit)
A third hydraulic control circuit routed to the coupler is available to drive rotating or clamping work tools such as sweepers or grapples; buckets and forks that only tilt or lift do not need it. Verify the individual machine carries the 3rd-circuit piping and in-cab control before specifying a powered attachment.
Sweeper / broom attachment
A broom/sweeper head is listed among the compatible work tools for this loader class for yard and site cleanup duty. It needs the 3rd hydraulic circuit to drive brush rotation.
Factory work-equipment features
Standard equipment includes a return-to-dig function that automatically re-levels the bucket after a dump cycle, cutting operator input on repetitive loading. This is a control feature of the loader linkage rather than a swappable tool, but it applies to bucket and grab-type attachments cycled through that linkage.
All WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) assemblies by section
Every catalogued assembly group for the Komatsu WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
01 Engine, Engine Mounting
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 00 Maintenance Kit
| 42***01 | Filter Element | 1 |
| 42***02 | Filter Element | 1 |
| 42***50 | Filter Element | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 01 Engine, Engine Mounting
| 01***00 | Capscrew | 4 |
| 01***25 | Bolt,L.H. (For Add. Air Compressor) | 16 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 4 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 02 Cylinder Block And Attaching Parts
| YM***00 | Plug | 1 |
| YM***00 | Screw | 18 |
| YM***00 | Main Metal Ass'Y (Std) | 5 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 04 Crank Assembly
| YM***00 | Crankshaft, Assembly | 1 |
| YM***80 | Gear, Ring | 1 |
| YM***00 | Connecting Rod, Assembly | 4 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 05 Cylinder Head And Attaching Parts
| YM***20 | Pedestal | 4 |
| YM***80 | Retainer, Spring | 16 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 06 Gasket Kit, Cylinder Head
| YM***40 | O-Ring | 2 |
| YM***40 | O-Ring,Drain Plug | 1 |
| YM***30 | O-Ring (Kit) | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 08 Timing Gear Case And Flywheel Housing
| YM***52 | Screw | 9 |
| YM***02 | Bolt Plated | 3 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 09 Engine Timing Gear
| YM***00 | Snap Ring | 1 |
| YM***09 | Gear Ass'Y,Hydraulic Pump | 1 |
| YM***00 | Idle Gear Ass'Y | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 10 Engine Lubrication
| YM***60 | Protector | 1 |
| YM***00 | Bracket | 1 |
| YM***10 | Oil Sump | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 15 Water Pump
| 42***60 | Fan | 1 |
| YM***40 | O-Ring | 2 |
| YM***42 | Screw | 3 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 20 Injection System
| YM***00 | Nozzle Holder Ass'Y | 4 |
| YM***22 | Screw | 3 |
| YM***20 | Spring | 4 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 28 Fuel System, Pre Filter
| 01***12 | Bolt - Front Cover Mounting | 2 |
| 01***70 | Screw | 1 |
| 01***16 | Screw | 6 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 29 Fuel System, Fine Filter
| YM***02 | Screw | 2 |
| YM***40 | Screw | 5 |
| YM***00 | Fuel Feed Pump, Assembly | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 49 Air Filter System, Standard
| 01***35 | Bolt,(For Fix Position) | 2 |
| 01***90 | Screw | 4 |
| 07***09 | Clamp, Hose - At Water Pump | 3 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 54 Air Cleaner
| 42***70 | Air Filter | 2 |
| 42***01 | Filter Element | 1 |
| 42***02 | Filter Element | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 57 Exhaust System
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***25 | Bolt - Relay Mounting | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 6 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 01 Engine, Engine Mounting : 60 Engine Control
| 01***16 | Bolt - Box Mounting | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***05 | Nut,(For Air Conditioner Less), Nut | 2 |
02 Cooling System
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 02 Cooling System : 73 Radiator
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 6 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 6 |
| 01***16 | Spring Washer | 6 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 02 Cooling System : 74 Radiator Attaching Parts
| 01***14 | Bolt,(W/Joy Stick Str.)(W/O Heater) | 2 |
| 01***16 | Bolt, Mount Solenoid Valve | 3 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 6 |
03 Electric System
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 42 Alternator
| YM***04 | Screw | 1 |
| YM***40 | Distance Piece | 1 |
| YM***40 | Distance Piece | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 43 Starter Motor
| YM***52 | Bolt Plated | 2 |
| YM***20 | Shift Lever Ass'Y | 1 |
| YM***10 | Housing | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 56 Electric System, Lighting Unit
| 01***16 | Screw, Mount Parking Lights | 4 |
| 42***60 | Plain Washer | 4 |
| 42***70 | Nut | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 61 Electric System, Harness
| 01***16 | Screw | 2 |
| 01***12 | Bolt,(With Speedometer) | 3 |
| 01***16 | Bolt - Starting Motor Ground Cable | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 62 Electric System, Harness
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 63 Instrument Box And Attaching Parts
| 41***60 | Orifice Plate | 1 |
| 42***01 | Key Kit | 1 |
| 42***10 | Starter Switch | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 64 Instrument Box And Attaching Parts
| 01***14 | Bolt,(W/Joy Stick Str.)(W/O Heater) | 2 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 42***90 | Protective Strip | 3 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 65 Windshield-Wiper - Washer System
| 01***16 | Bolt, Mounting Transmission Control Switch | 4 |
| 41***60 | Nut | 3 |
| 42***60 | Connection | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 68 Radio
| 01***12 | Screw,(Without Ashtray) | 2 |
| 42***00 | Sleeve | 1 |
| 42***50 | Antenna | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 70 Turning Light
| 01***25 | Bolt, Pinlock | 1 |
| 01***12 | Bolt,(With Speedometer) | 2 |
| 01***26 | Washer,Spring | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 71 Back Up Alarm
| 08***34 | Tie, Cable | 3 |
| 42***00 | Sleeve | 4 |
| 42***60 | Hose | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 74 Battery
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***12 | Washer,(With Body Positioner) | 2 |
| 42***00 | Battery | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 03 Electric System : 75 Battery Main Switch
| 01***16 | Bolt, Mounting Transmission Control Switch | 2 |
| 01***05 | Nut,(For Air Conditioner Less), Nut | 2 |
| 01***19 | Washer,Spring (With Extinguisher) (D31p) | 2 |
04 Transmission, Universal Joint
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 04 Transmission, Universal Joint : 61 Axial Piston Pump
| 42***45 | Guide Sleeve | 2 |
| 42***61 | Gasket | 1 |
| 42***74 | Pump | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 04 Transmission, Universal Joint : 75 Universal Joint
| 42***20 | Screw | 16 |
| 42***30 | Nut | 16 |
| 42***00 | Universal Joint | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 04 Transmission, Universal Joint : 83 Clutch
| 01***35 | Screw | 8 |
| 01***25 | Bolt,Sight | 12 |
| 42***40 | Disc | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 04 Transmission, Universal Joint : 97 Hydraulic Pump Drive
| 01***00 | Bolt,(For Front Brake Release) | 1 |
| 01***50 | Screw | 2 |
| 01***25 | Bolt,Sight | 4 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 04 Transmission, Universal Joint : 98 Axial Piston Engine
| 42***62 | Grub Screw | 2 |
| 42***31 | Plate | 1 |
| 42***58 | Plug | 2 |
05 Rear Axle
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 05 Rear Axle : 43 Rear Axle
| 42***20 | U Bolt | 4 |
| 42***60 | Nut | 16 |
| 42***00 | Rear Axle | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 05 Rear Axle : 44 Axle Insert
| 42***14 | Differential Ass'Y | 1 |
| 42***15 | Differential Ass'Y | 1 |
| 42***17 | Magnetic Plug | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 05 Rear Axle : 46 Brake
| 42***72 | O-Ring | 4 |
| 42***73 | Lever | 2 |
| 42***74 | Disc | 2 |
06 Disc Wheel, Chain
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 06 Disc Wheel, Chain : 77 Disc Wheel
| 42***10 | Valve | 4 |
| 42***30 | Rim | 4 |
| 42***20 | Rim | 4 |
07 Steering
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 07 Steering : 00 Steering, Steering Mounting
| 01***35 | Bolt, Stopper | 1 |
| 01***40 | Screw | 1 |
| 01***45 | Screw | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 07 Steering : 01 Steering Column
| 42***80 | Steering Column | 1 |
| 42***01 | Nut | 1 |
| 42***02 | Rubber Washer | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 07 Steering : 07 Steering Cylinder
| 42***01 | Steering Cylinder | 1 |
| 42***00 | Cylinder | 1 |
| 42***01 | Ball And Socket Join | 2 |
08 Front Axle
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 08 Front Axle : 00 Front Axle
| 01***95 | Screw | 8 |
| 01***13 | Nut,(For Adjustable Rod) | 8 |
| 01***26 | Washer,Spring | 8 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 08 Front Axle : 01 Axle Insert
| 42***03 | Cover | 1 |
| 42***14 | Differential Ass'Y | 1 |
| 42***15 | Differential Ass'Y | 1 |
09 Brake System
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 09 Brake System : 00 Brake System
| 01***60 | Bolt,(With Body Positioner) | 2 |
| 01***30 | Bolt,Stopper | 1 |
| 01***40 | Screw | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 09 Brake System : 90 Hand Brake And Operating Assembly
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***12 | Washer,(With Body Positioner) | 1 |
| 04***15 | Pin,Cotter (Itl) | 1 |
10 Frame
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 10 Frame : 02 Frame
| 01***12 | Bolt,(With Speedometer) | 8 |
| 01***16 | Bolt, Mount Solenoid Valve | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 10 Frame : 03 Hinge
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 4 |
| 01***30 | Screw | 8 |
| 01***40 | Screw | 12 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 10 Frame : 06 Fender
| 42***90 | Nut | 8 |
| 42***00 | Nut | 6 |
| 42***60 | Plain Washer | 8 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 10 Frame : 09 Radiator Guard And Bonnet
| 01***12 | Bolt - Front Cover Mounting | 6 |
| 01***30 | Bolt,Stopper | 4 |
| 01***35 | Screw | 6 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 10 Frame : 12 Counterweight
| 01***35 | Bolt,(With Rops) | 2 |
| 01***00 | Screw | 2 |
| 01***40 | Bolt,(For Operator'S Cab) | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 10 Frame : 14 Platform
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 6 |
| 01***12 | Washer,(With Body Positioner) | 6 |
| 42***90 | Gasket | 1 |
11 Drivers Cab
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 11 Drivers Cab : 00 Safety Cabin
| 01***20 | Bolt,(Without Air Con. Or Heater) | 3 |
| 01***25 | Capscrew | 6 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 6 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 11 Drivers Cab : 01 Safety Cabin, Doors
| 01***20 | Screw | 6 |
| 42***60 | Screw | 4 |
| 42***40 | Nut | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 11 Drivers Cab : 04 R.O.P.S. Canopy
| 01***20 | Bolt,(Without Air Con. Or Heater) | 3 |
| 01***08 | Washer,(For Mounting First Aid Kit) | 3 |
| 42***90 | Nut | 8 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 11 Drivers Cab : 11 Soundproofing Of Cabin
| 42***80 | Screw | 14 |
| 42***30 | Air Nozzle | 2 |
| 42***00 | Cladding | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 11 Drivers Cab : 12 Soundproof, Platform
| 42***50 | Insulating Mat | 1 |
| 42***70 | Insulating Mat | 1 |
| 42***80 | Insulating Mat | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 11 Drivers Cab : 13 Soundproof, Motor-Verkleidung
| 42***40 | Bracket | 16 |
| 42***50 | Screw | 16 |
| 42***80 | Insulating Mat | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 11 Drivers Cab : 18 Heater
| 01***16 | Bolt, Mounting Transmission Control Switch | 6 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 1 |
| 01***08 | Nut,See Fig. K4010-04a0 | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 11 Drivers Cab : 19 Air Conditioner
| 01***16 | Bolt, Mounting Transmission Control Switch | 6 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 1 |
| 01***08 | Nut,See Fig. K4010-04a0 | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 11 Drivers Cab : 27 Drivers Seat, Attaching Parts
| 01***25 | Screw | 4 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 2 |
| 01***12 | Washer,(With Body Positioner) | 4 |
12 Tools, Accessory, Lettering
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 00 Wedge And Attachement
| 01***20 | Bolt,See Fig. K4010-65a0 | 8 |
| 42***30 | Underl Wedge | 2 |
| 42***40 | Bracket | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 01 Tools And Accessory
| 01***40 | Screw | 4 |
| 01***40 | Nut,(Noise Suppression Spec.) | 1 |
| 04***55 | Pin, Cotter | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 02 Tools
| 42***30 | Tool Bag | 1 |
| 42***10 | Tool Set | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 03 Lettering
| 09***81 | Plate? Caution,Don'T Jump Start | 1 |
| 41***40 | Note Plate | 3 |
| 42***80 | Note Plate | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 04 Decals, German
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 05 Decals, English
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 06 Decals, French
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 08 Decals, Italian
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 09 Decals, Spanish
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 10 Decals, Swedish
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 11 Decals, Danish
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 12 Decals, Finnish
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 13 Decals, Norwegian
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 14 Decals, Dutch
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 15 Decals, Portuguese
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 12 Tools, Accessory, Lettering : 16 Decals, Greek
| 09***80 | Plate? Safety,Without E.S.Cover (Except Ec) | 1 |
| 42***50 | Plate? Operating | 1 |
| 42***80 | Plate? Caution,Hot Water | 1 |
13 Hydraulic System
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 13 Hydraulic System : 01 Hydraulic System
| 01***65 | Capscrew | 4 |
| 01***10 | Screw | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 13 Hydraulic System : 07 Check Port
| 42***50 | Stud | 1 |
| 42***60 | Brace | 4 |
| 42***80 | Union | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 13 Hydraulic System : 08 Pipings For Remote Control Valve
| 01***65 | Screw | 2 |
| 01***16 | Bolt, Mounting Transmission Control Switch | 4 |
| 41***80 | Lock Washer | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 13 Hydraulic System : 12 Control Valve
| 42***00 | Inlet Ass'Y | 1 |
| 42***01 | Timing Gear Case | 1 |
| 42***04 | Cover | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 13 Hydraulic System : 25 Lift Cylinder And Pipings
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***65 | Capscrew | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 13 Hydraulic System : 26 Lift Cylinder
| 07***15 | Gasket,(Hd325?Pc750?800?1800) (A5010) | 2 |
| 42***80 | Boxnut | 1 |
| 42***90 | Stud | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 13 Hydraulic System : 27 Bucket Cylinder And Pipings
| 42***40 | Elbow Nipple | 2 |
| 42***50 | Nut | 2 |
| 42***70 | Hose Assembly | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 13 Hydraulic System : 28 Bucket Cylinder
| 42***21 | Plug | 1 |
| 42***60 | Bushing | 2 |
| 42***40 | Bucket Cylinder | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 13 Hydraulic System : 31 Hose Rupture Safety Device
| 01***45 | Bolt,(With Water Separator Type) | 2 |
| 01***55 | Bolt,(See Service News) | 2 |
| 41***80 | Lock Washer | 2 |
14 Boom, Thrust Frame - Arm
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 14 Boom, Thrust Frame - Arm : 00 Boom
| 01***16 | Bolt - Starting Motor Ground Cable | 9 |
| 42***10 | Nut | 2 |
| 42***60 | Plain Washer | 9 |
15 Equipment
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 00 Bucket
| 42***01 | Bucket | 1 |
| 42***21 | Bucket | 1 |
| 42***20 | Reinforcement | 4 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 02 Quick Change
| 01***85 | Bolt,(For Perforated Mask) | 2 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 2 |
| 01***16 | Washer,Radio Controlled Slag Handling | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 03 Quick Change, Pipings
| 01***40 | Bolt - M6 X 40lg | 2 |
| 01***70 | Screw | 6 |
| 01***25 | Bolt - Relay Mounting | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 04 Fork Lift
| 42***00 | Locator | 2 |
| 42***80 | Carrier | 1 |
| 42***00 | Prongs | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 05 Grab Bucket
| 01***13 | Nut,(For Adjustable Rod) | 9 |
| 42***03 | Screw | 9 |
| 42***04 | Spring Washer | 9 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 06 Grab Bucket, Pipings
| 42***19 | Union | 2 |
| 42***20 | Union | 4 |
| 42***21 | Tube | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 07 Side Tip Bucket
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***30 | Bolt,(For Rubber Shoe) | 1 |
| 01***26 | Washer,Spring | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 10 Ripper Tooth Wear Plate And Marker Light
| 01***16 | Bolt - Seat And Tether Belt Mounting | 4 |
| 01***35 | Screw | 2 |
| 01***50 | Wing Nut | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 11 Return To Dig
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 01***25 | Bolt,L.H. (For Add. Air Compressor) | 2 |
| 01***30 | Bolt, Mounting - Front Hand Rails | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 13 Compost Buckt
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***25 | Bolt, Pinlock | 2 |
| 01***10 | Nut,(Without Air Conditioner) | 10 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 20 High Tip Bucket
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 01***30 | Bolt, Mounting - Front Hand Rails | 2 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 48 Sweeper
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 01***03 | Nut,(With Joy Stick Steering) | 2 |
| 08***34 | Tie, Cable | 15 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 49 Crane Boom
| 42***00 | Screw | 2 |
| 42***12 | Boom | 1 |
| 42***13 | Suspension Unit | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 62 A.L.S. Equipment
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 65 A.L.S. Solenoid Valve
| 42***60 | O-Ring | 1 |
| 42***89 | Electrical Plug | 1 |
| 42***60 | Valve | 1 |
Komatsu : Wa90-3(S/N H20319-Up; Wa95-3 S/N H20672-Up) : 15 Equipment : 89 Special Equipment Italy
| 01***40 | Bolt (Op) | 2 |
| 01***40 | Nut,(Noise Suppression Spec.) | 2 |
| 01***16 | Plain Washer | 3 |
WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) serial number reference
On these compact WA-series loaders the PIN/serial plate is riveted to the right-hand side of the machine, either on the frame behind the front fender or on the frame rail under the operator's cab; a full serial is also stamped into the frame metal near the plate as a backup. Read the prefix as the letter-plus-leading-digits block (e.g. H20xxx) and compare the trailing number against the manufacturer's break-point table, since Komatsu used a running production count rather than encoding plant or option info in individual characters. Breaks in that count (like the H20319/H20672 points here) mark a running production change; check the specific parts book covering that prefix for what changed, since the change itself is not always documented at the break point level.
| Prefix | Identifies | Notes |
|---|---|---|
| H20 | WA90-3, S/N H20319 and up | Continues the WA90-3 running serial count on the shortened PIN format (letter plus five digits), following the earlier HA970051-block style. Sits directly above a short H20316-H20318 bridge run that belongs to the prior build and is not part of this range. Engine fitted is the Komatsu S4D98E diesel (Yanmar-built, equivalent to a Yanmar 4TNV98T block), net rating around 51.5 kW (70 PS). What specifically changed in production at this exact break point is not documented in public parts references; confirm with dealer. |
| H20 | WA95-3, S/N H20672 and up | Continues the WA95-3 running serial count on the same shortened PIN format, following the earlier HA980051 block and a short H20651-H20671 bridge run (not part of this range). Shares the S4D98E engine family with the WA90-3, net rating around 55 kW. What specifically changed in production at this exact break point is not documented in public parts references; confirm with dealer. |
Frequently asked questions
What engine powers the Komatsu WA90-3 and WA95-3 in this serial range?
Both use the Komatsu S4D98E-2, a turbocharged four-cylinder diesel (factory-equivalent to a Yanmar 4TNV98T block), mechanically governed with no ECM. Net output is 51.5 kW (70 PS, about 69 hp) on the WA90-3 and 55 kW (74.8 PS, about 75 hp) on the WA95-3.
What is the operating weight of the WA90-3 and WA95-3?
The WA90-3 runs about 5.61 t (5,610 kg / 12,368 lb) operating weight. The WA95-3 is slightly heavier at about 6.02 t (6,020 kg / 13,272 lb). Both figures are for a standard bucket configuration and shift with attachment choice.
What replaced the WA90-3 and WA95-3?
Komatsu carried the WA90 nameplate forward into the WA90-5 (built roughly 2005-2008, grown to about 6.4 t operating weight) and later the WA90-6 (roughly 2008-2017). No later generation under the WA95 nameplate is documented; Komatsu's compact-loader range does not appear to have continued that specific model number past the -3 series.
What WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP) owners discuss
How does the HST (hydrostatic) drive on the WA90-3/WA95-3 hold up over time?
The axial-piston-pump-and-motor hydrostatic drive is generally regarded as a strong point of this loader size class for smooth, shock-free direction changes, but response going soft or hesitant under load is the wear symptom owners mention most. Weak response usually traces back to old or low hydraulic oil rather than a failing pump, so a fluid and filter change is the first cheap fix to try. Response that stays weak after a service points to worn charge-pump or main pump/motor components, which is a bigger repair. Letting the machine idle before working it in cold weather is commonly recommended since the hydraulic oil needs to come up to temperature for full power and smooth control.
Is it normal for the loader to feel sluggish or the steering to lag on a cold start?
Yes, this is typical of this size machine and not a fault by itself. Cold hydraulic oil is thick and slows lift, tilt, and steering response until the system warms up, and rushing a cold machine into full-load work is a common cause of premature pump and cylinder wear. A short idle and a few cycles of the loader arm and steering before loading is the usual practice reported by operators of these compact loaders.
What wear patterns show up on these loaders after years of service?
The center articulation (pivot) joint and its bushings are the area to watch, since constant steering flex at that hinge is the main source of play over time. Front axle king pins and tie-rod ends wear next, especially on machines used for tight-radius, repetitive scoop-and-carry work like yard or landscape material handling. Front tires wear faster than rears on loaders run mostly in forward-loading cycles. Regular greasing of the pivot and axle points at the interval in the operator's manual is repeatedly cited as the difference between a tight machine at high hours and a sloppy one.
What should I know about the S4D98E / Yanmar 4TNV98T-equivalent engine used in this series?
This turbocharged four-cylinder is generally well regarded in this class for fuel economy and smooth running, matching its Yanmar industrial-engine roots. A puff of white smoke on a cold start that clears within a few seconds is normal; smoke that lingers or comes back under load points to injector or glow-plug wear worth having checked. Because this fuel system is sensitive to contamination, owners stress draining the water separator and keeping fuel filters on schedule to avoid injection pump problems. Coolant that shows oil, or oil that shows a milky mix, after high hours is the classic head gasket warning sign on engines this age.
What electrical or sensor issues come up on these compact loaders?
The wiring harness that crosses the articulation joint takes constant flex over the machine's life, and chafed wiring there is the most common source of intermittent gauge readings, warning lights, or rear light faults. Coolant temperature senders and the hydraulic filter restriction sensor are also known to throw false warnings before they actually fail. Corroded connectors from dust and moisture exposure are a recurring cause of hard-to-trace electrical gremlins on machines that have spent years outdoors. Starter relay and solenoid wear shows up as intermittent no-crank or a starter that stays engaged after the key is released — if a starter fails to disengage or the machine cranks unexpectedly, have your dealer verify the wiring and relay before putting the machine back in service.
How much lift and tilt cylinder drift is normal, and when does it signal a real problem?
Some settling in the lift arm and bucket after the loader sits fully raised or curled is expected as seals age, and light drift over several minutes is considered normal wear for a machine at moderate to high hours. Drift that lets the bucket or boom sink noticeably within a minute or two points to worn cylinder seals or a leaking control valve section that needs attention. Play in the bucket linkage and quick-coupler pins is a separate, more common complaint and is usually just pin and bushing wear from repetitive loading cycles.
What should I check before buying a used WA90-3/WA95-3?
Start the engine cold and watch the exhaust — smoke that doesn't clear quickly is a red flag on this engine family. Run the loader through forward and reverse under load and check for smooth, immediate hydrostatic response without lag or creep. Check the center articulation joint for play by rocking the machine at the pivot with the engine off, and inspect front axle king pins and tie-rods the same way. Cycle the lift and tilt cylinders fully and time any drift with the arm raised. Look at coolant and engine oil for cross-contamination, check tires and rims for cracks or sidewall damage, and ask for service records showing regular fluid and filter intervals. Because HST charge pressure and pump/motor condition aren't fully visible from a walkaround, have your dealer verify these with a proper pressure and load test before you commit to a purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Serial-range & configuration variants
This page covers the Komatsu WA90-3(S/N H20319-UP; WA95-3 S/N H20672-UP). Related factory variants of the same model family:
WA90-3(S/N HA970051-HA970315 & H20316-H20318; WA95-3 S/N HA980051-HA980668 & H20651-H20671)
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