Komatsuwheel loaderlarge (wa400 - )
Komatsu WA420-3H ACTIVE(S/N WA420H30297-Up)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu WA420-3H ACTIVE (S/N WA420H30297-Up) is a heavy-duty wheel loader designed for earthmoving and quarry operations. This series features the SAA6D114E-1 engine, delivering 162 kW/220 HP of net power. The machine operates within a weight class of approximately 20,020 kg (44,138 lb) to 44,357.1 lb, depending on configuration. It is equipped with a bucket capacity ranging from 3.6 m³ (4.7 yd³) to 4.2 m³ (5.5 yd³) and utilizes a 4-speed fully automatic powershift transmission.
The 'Active' designation represents an evolution in the WA420 series, focusing on improved efficiency and environmental compliance through advanced Tier 4 engine technology. This generation is highly valued in the used market due to its high resale value, long service life, and integration with Komatsu KOMTRAX telematics for remote monitoring. The machine remains a staple for fleet managers because of its proven durability in loading sand, gravel, and dirt into conveyors or dump trucks.
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 WA420-3H ACTIVE(S/N WA420H30297-Up) specifications
Engine
| Model | SAA6D114E-1 |
| Gross Power | 220 hp (162 kW) |
| Displacement | 504.1 cu in |
| Cylinders | 6 |
| Aspiration | Turbocharged |
Weights
| Operating Weight | 44,357.1 lb (20,120 kg) |
| Static Tipping Weight | 34,392.2 lb |
Dimensions
| Length With Bucket On Ground | 26.32 ft |
| Width Over Tires | 9.45 ft |
| Height To Top Of Cab | 11.32 ft |
| Wheelbase | 10.83 ft |
| Ground Clearance | 1.53 ft |
| Hinge Pin - Max Height | 13.74 ft |
| Reach At Max Lift And Dump | 3.34 ft |
Performance
| Bucket Capacity - Heaped | 4.71 yd³ |
| Bucket Width | 9.85 ft |
| Breakout Force | 41,072.6 lb |
| Dump Clearance At Max Raise | 9.96 ft |
| Turning Radius | 19.9 ft |
| Pump Flow Capacity | 86.7 gal/min |
| Raise Time | 6.7 sec |
| Dump Time | 1.5 sec |
| Lower Time | 3.6 sec |
Service capacities (summary)
| Fuel Capacity | 89.9 gal |
| Hydraulic System Fluid Capacity | 55.5 gal |
| Engine Oil Fluid Capacity | 6 gal |
| Cooling System Fluid Capacity | 13.3 gal |
| Transmission Fluid Capacity | 15.9 gal |
| Front Axle/Diff Fluid Capacity | 15.9 gal |
| Rear Axle/Diff Fluid Capacity | 15.9 gal |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
WA420-3H ACTIVE(S/N WA420H30297-Up) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not specified | Komatsu Engine Oil (EO) |
| Cooling system | Not specified | Komatsu Super-coolant AF-NAC |
| Transmission/powertrain compartments | Not specified | Komatsu Powertrain Oil (TO) |
| Hydraulic system and tank | Not specified | Komatsu HO46 Hydraulic Fluid (ISO VG 46) |
| Axles/differentials | Not specified | Komatsu Axle Oil (AXO) |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu WA420-3H ACTIVE(S/N WA420H30297-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 WA420-3H ACTIVE(S/N WA420H30297-Up) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu KOWA (Oil Wear Analysis) at every major service interval to monitor engine oil for wear metals like iron, copper, and lead. For the hydraulic system, track particle counts and viscosity changes via fluid sampling. Use KOMTRAX telematics to remotely monitor fuel consumption, fault codes, and DEF levels. Regular analysis of coolant pH and SCA concentration prevents scale buildup and radiator overheating in the SAA6D114E-1 engine.
Corrective & Common Repairs
Monitor hydraulic hoses for cracks or leaks to prevent pressure loss. Inspect articulation and steering pins regularly; if play is detected, prepare for replacement. Check the transmission's 4-speed powershift system for smooth engagement. If fuel sulfur content exceeds 1.0%, reduce engine oil change intervals to one-fourth of standard duration. Ensure all brake system components are inspected to maintain service and parking brake functionality.
Overhaul & Rebuild Points
Plan for major hydraulic oil changes at 2,000-hour intervals to protect pumps and valves. During long-term rebuilds, evaluate the turbocharger and valve train adjustments. Inspect the transmission's constant-mesh spur gears and multi-disc clutch for wear. At approximately 4,500 hours, prepare for KDPF (Diesel Particulate Filter) exchange units. Comprehensive structural inspections of the boom and bucket linkages are required during major component overhauls.
Seasonal & Environment Servicing
In dusty environments, frequently clean or replace the air filter outer element to prevent engine ingestion. During cold operations, ensure the radiator/oil cooler fins are clear of debris to maintain heat exchange efficiency. Always use Komatsu original anti-freeze in the cooling system to avoid impurities found in river water. For high-moisture sites, prioritize draining the fuel/water separator daily to prevent contamination.
WA420-3H ACTIVE(S/N WA420H30297-Up) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 6732-71-6120 | Filter, Fuel - Water Separator | Fuel system service | Check fitment → |
| 6732-71-6250 | Head, Fuel Filter | Fuel system service | Check fitment → |
| 6732-21-5530 | Cartridge, Engine Oil Filter | Lubrication service | Check fitment → |
| 1267388H1 | Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
WA420-3H ACTIVE(S/N WA420H30297-Up) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E10 | Engine controller power failure or engine control drive system circuit malfunction (may cause engine stall) | ECM power connections, fuses, or ground wire issues | Inspect ECM power connections, fuses, or ground wires |
| E11 | Engine control system failure resulting in reduced output power to protect the engine | High coolant temperature, low oil pressure, or clogged air filter | Check coolant temperature, oil pressure, and air filter status |
| CA115 | Engine crankshaft speed sensor failure or backup speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify voltage at the pin connector |
| CA451 / CA452 | Common rail pressure sensor feedback value is too high or too low | Malfunctioning fuel rail pressure sensor or fuel pump line issues | Diagnose the fuel rail pressure sensor or inspect pump lines |
| CA441 / CA442 | Battery voltage is too low or too high | Alternator failure or battery issues | Replace the alternator or battery; check the voltage regulator |
| AA10NX | Air cleaner clogging | Accumulated debris in the air filter element | Replace the air filter |
| B@BCNS | Engine coolant overheating | Low coolant level, radiator fin blockage, or fan belt failure | Check radiator fins, fan belt, and coolant level |
| DGH2KB | Hydraulic oil temperature sensor short circuit | Faulty 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.
WA420-3H ACTIVE(S/N WA420H30297-Up) attachments & work tools
Buckets
Standard configurations include general-purpose and high-capacity buckets. Typical capacities for this class range from 3.2 m³ (3.6 yd³) to 4.71 yd³ (heaped).
Forks
The machine accepts standard forks for material handling applications.
Quick Couplers
The unit is compatible with quick couplers to enable rapid changes between different work tools on site.
Hydraulic Attachments
The machine supports various hydraulic attachments. Specific requirements for auxiliary hydraulic kits or arrangements should be verified with a dealer based on the tool selected.
All WA420-3H ACTIVE(S/N WA420H30297-Up) assemblies by section
Every catalogued assembly group for the Komatsu WA420-3H ACTIVE(S/N WA420H30297-Up). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
01 Engine, Engine Mounting
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 00 Maintenance Kit
| 07***85 | O-Ring,(F5350-63a0 -4 ) | 1 |
| 07***75 | O-Ring (Kit) | 2 |
| 07***23 | O-Ring,(F4350-68a0 -13 ) | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 01 Engine, Engine Mounting
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 2 |
| 01***50 | Capscrew - M20 X 2.50 | 4 |
| 01***40 | Screw | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 02 Cylinder Block And Attaching Parts
| 12***94 | Cylinder Block A | 1 |
| 42***20 | Thermocouple | 1 |
| 62***50 | Draincock (1/4 Nptf) | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 03 Gasket Kit, Cylinder Bloc
| 67***50 | Seal, Rectangular Ring | 1 |
| 67***50 | Gasket, Cover Plate | 1 |
| 67***20 | Bolt (M12x1.75x30) | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 04 Crank Assembly
| 12***91 | Connecting Rod Ass'Y | 6 |
| 12***92 | Piston Ring A.,Piston | 6 |
| 13***H1 | Screw | 12 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 05 Cylinder Head And Attaching Parts
| 12***H2 | Exhaust Valve | 6 |
| 12***H2 | Insert,Valve | 6 |
| 12***H1 | Spring Seat | 6 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 06 Gasket Kit, Cylinder Head
| 07***12 | Gasket,Injection Pump Piping | 4 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 12***H1 | Spring Seat | 6 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 07 Cylinder Head Cover, Attaching Parts
| 07***80 | Clip | 1 |
| 07***10 | Hose | 1 |
| 08***36 | Tie, Cable | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 08 Timing Gear Case And Flywheel Housing
| 13***H1 | Cover,Gear | 1 |
| 13***H1 | Housing,Flywheel | 1 |
| 67***20 | Plug, Pipe (3/4 Nptf) | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 09 Engine Timing Gear
| 12***H2 | Camshaft | 1 |
| 67***20 | Support, Camshaft Thrust | 1 |
| 67***60 | Bolt (M8x1.25x22) | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 10 Engine Lubrication
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 2 |
| 07***12 | Gasket,Oil Pan Drain | 2 |
| 07***18 | Joint, Oil Pan Drain Tube | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 14 Oil Filter
| 12***H1 | Compression Spring | 1 |
| 12***H1 | O-Ring | 1 |
| 12***H1 | Filter Element | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 15 Water Pump
| 67***60 | Bolt (M8-1.25x95) | 2 |
| 67***20 | Seal, O-Ring | 1 |
| 67***50 | Clamp, Hose (59-83mm) | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 17 Fan, Belt Tensioner
| 01***10 | Screw | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 12***92 | Support Ass'Y,Fan | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 18 V-Belt Arrangement
| 41***20 | V-Belt | 1 |
| 67***70 | Belt | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 19 Cooling System
| 12***H1 | Adaptor | 1 |
| 12***H1 | Filter | 1 |
| 42***20 | Thermocouple | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 20 Injection System
| 07***12 | Gasket,Mechanical Pump Piping | 2 |
| 07***12 | Gasket,Injection Pump Piping | 4 |
| 12***H1 | Isolator,Vibration | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 21 Injection Pump
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 2 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 13***H1 | Screw,Joint | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 26 Fuel Pump
| 07***12 | Gasket,Injection Pump Piping | 2 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 07***97 | Clamp,(With Pre-Fuel Filter) | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 27 Injection Pump Drive
| 67***50 | Seal | 1 |
| 67***20 | Stud (M10x1.50x50) | 2 |
| 67***70 | Nut, Hex Flange (M10-1.50 Thd) | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 30 Fuel System, Filter
| 01***55 | Bolt, Fuel Tank Mounting | 1 |
| 01***20 | Bolt, Fuel Tank Mounting | 2 |
| 01***10 | Screw,(For Lighter) | 5 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 47 Intake Manifold, Turbocharger
| 01***20 | Bolt - Mount Risers To Cab Floor | 2 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 1 |
| 01***10 | Nut,(Without Air Conditioner) | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 48 Turbocharger
| 13***91 | Connection Ass'Y,Oil Drain | 1 |
| 13***91 | Turbocharger | 1 |
| 67***30 | O-Ring,Turbocharger Drain | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 49 Air Filter System, Standard
| 01***75 | Screw | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 6 |
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 54 Air Cleaner
| 42***01 | Cover | 1 |
| 42***02 | Filter Element | 1 |
| 42***03 | Filter Element | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 56 Ether Starting Kit
| 01***12 | Bolt,(See Fig. K0210-16a0) | 2 |
| 01***16 | Bolt, Mount Solenoid Valve | 2 |
| 08***19 | Band - Tie Hose To Wire Harness | 3 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 57 Exhaust System
| 01***75 | Bolt (M10-1.50x75) | 1 |
| 01***30 | Screw | 2 |
| 01***35 | Screw | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 01 Engine, Engine Mounting : 60 Engine Control
| 01***16 | Bolt - Box Mounting | 4 |
| 01***22 | Screw | 1 |
| 01***40 | Bolt - M6 X 40lg | 1 |
02 Cooling System
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 02 Cooling System : 73 Radiator
| 01***20 | Bolt,(Large Capacity Type) (Std) | 8 |
| 01***65 | Bolt - Return Line And Suction Linehose Clamps | 4 |
| 01***10 | Screw | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 02 Cooling System : 75 Hydraulic Oil Cooling
| 01***35 | Screw | 24 |
| 01***55 | Screw | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 02 Cooling System : 77 Cooling Water Pipes
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 8 |
| 01***90 | Screw | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 02 Cooling System : 79 Transmission Oil Cooling
| 01***16 | Bolt - Starting Motor Ground Cable | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***35 | Bolt, Mount Bracket To Floor | 4 |
03 Electric System
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 41 Alternator And Starter Motor
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 42 Alternator
| 41***02 | Nut | 1 |
| 41***03 | Disc | 1 |
| 41***04 | Pulley | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 43 Startermotr
| 41***02 | Bushing | 1 |
| 41***03 | Disc | 1 |
| 41***04 | Anchor | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 56 Electric System, Lighting Unit
| 01***22 | Screw | 4 |
| 01***12 | Screw,(For Side Lamp) (Not Shown) | 4 |
| 01***16 | Screw,(For Joy Stick Steering) | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 61 Electric System
| 01***16 | Bolt - Starting Motor Ground Cable | 4 |
| 08***19 | Band - Tie Hose To Wire Harness | 0 |
| 08***14 | Clip,(For Large-Capacity Battery) | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 62 Electric System, Relay
| 01***10 | Bolt - Relay And Flasher Mounting | 7 |
| 41***70 | Bracket | 1 |
| 41***00 | Switch | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 64 Instrument Box And Attaching Parts
| 01***16 | Screw, Mount Parking Lights | 4 |
| 01***12 | Screw,(With Articulate Indicator) | 8 |
| 01***25 | Screw | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 66 Windshield-Wiper - Washer System
| 01***16 | Bolt, Mounting Transmission Control Switch | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***08 | Nut,(For Straight Tilt Dozer) (D65p) | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 68 Radio
| 42***09 | Antenna | 1 |
| 42***68 | Orifice Plate | 1 |
| 42***70 | Antenna | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 70 Turning Light
| 01***20 | Screw | 3 |
| 01***16 | Bolt, Mount Solenoid Valve | 4 |
| 41***10 | Bracket | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 71 Back Up Alarm
| 01***10 | Plain Washer | 4 |
| 42***20 | Horn | 1 |
| 42***70 | Screw | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 74 Battery
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 4 |
| 01***60 | Screw | 2 |
| 01***08 | Screw, Terminal | 6 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 03 Electric System : 75 Battery Main Switch
| 01***16 | Bolt - Box Mounting | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 08***30 | Earth Strap | 1 |
04 Transmission, Universal Joint
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 04 Transmission, Universal Joint : 75 Universal Joint
| 01***75 | Capscrew (4) (Qty.3 (5)) | 4 |
| 01***05 | Bolt, Yoke Mounting | 1 |
| 01***65 | Screw | 20 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 04 Transmission, Universal Joint : 85 Powershift Transmission
| 01***45 | Screw | 2 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 2 |
| 41***20 | O-Ring | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 04 Transmission, Universal Joint : 88 Gears And Shafts
| 01***35 | Screw | 2 |
| 01***14 | Nut,Ring | 1 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 04 Transmission, Universal Joint : 92 Powershift Transmission, Control Valve : Unit_02_of_03
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
| 07***30 | Ring, Seal - Between Sections | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 04 Transmission, Universal Joint : 92 Powershift Transmission, Control Valve : Unit_01_of_03
| 01***85 | Bolt, Divider Valve Mounting | 3 |
| 01***20 | Screw | 1 |
| 01***40 | Screw | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 04 Transmission, Universal Joint : 92 Powershift Transmission, Control Valve : Unit_03_of_03
| 01***20 | Screw | 4 |
| 01***12 | Washer,(With Body Positioner) | 4 |
| 42***01 | O-Ring | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 04 Transmission, Universal Joint : 94 Transmission Shift
| 01***16 | Bolt, Mounting Transmission Control Switch | 3 |
| 42***31 | Switch Ass'Y,Transmission | 1 |
| 42***10 | Switch | 1 |
05 Rear Axle
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 05 Rear Axle : 43 Rear Axle
| 01***60 | Flat Washer - M20 (Hardened) | 50 |
| 42***90 | Nut, Lug - Wheel Mounting | 50 |
| 42***01 | Rear Axle Assembly, Standard | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 05 Rear Axle : 44 Axle Insert
| 01***30 | Screw | 2 |
| 01***55 | Capscrew | 7 |
| 01***35 | Screw | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 05 Rear Axle : 46 Brake
| 01***40 | Capscrew | 28 |
| 01***70 | Capscrew | 32 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 28 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 05 Rear Axle : 49 Planetary Drive
| 01***20 | Screw | 24 |
| 01***50 | Bolt,(Not Used When With Cab) | 16 |
| 01***35 | Screw | 12 |
06 Disc Wheel, Chain
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 06 Disc Wheel, Chain : 77 Disc Wheel
| 42***00 | Wheel Assembly, 23.5 X 25 | 4 |
| 42***01 | Wheel Assembly | 4 |
| 42***40 | Valve | 4 |
07 Steering
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 00 Steering, Steering Mounting
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***20 | Capscrew | 2 |
| 01***50 | Screw | 3 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 01 Steering Column
| 01***12 | Bolt,(See Fig. K0210-16a0) | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 01***30 | Bolt, Mounting - Front Hand Rails | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 02 Steering Unit
| 42***01 | Seal | 1 |
| 42***02 | Ball | 1 |
| 42***03 | Bushing | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 04 Steering Valve, Pipings : Unit_01_of_02
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,For Weight Adjusting Bolt | 3 |
| 01***35 | Screw | 16 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 04 Steering Valve, Pipings : Unit_02_of_02
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***30 | Bolt,For Weight Adjusting Bolt | 3 |
| 01***30 | Screw | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 05 Steering, Pipings
| 01***80 | Screw | 6 |
| 01***16 | Bolt - Starting Motor Ground Cable | 4 |
| 01***12 | Washer,(With Body Positioner) | 12 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 06 Steering Cylinder And Pipings
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***50 | Bolt,(See Fig.A4010-C3w6) | 4 |
| 01***11 | Nut,(With Under Mirror) | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 07 Steering Cylinder : Unit_01_of_02
| 07***90 | O-Ring,(Dk029369-0020) (K2) | 1 |
| 07***85 | O-Ring,(For Snow Removing) | 1 |
| 07***57 | Seal, Dust | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 07 Steering Cylinder : Unit_02_of_02
| 07***90 | O-Ring,(Dk029369-0020) (K2) | 1 |
| 07***85 | O-Ring,(For Snow Removing) | 1 |
| 07***08 | Plug,(For W/O. Corrosion Resistor) | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 08 Emergency Steering Pump And Pipings : Unit_01_of_02
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***70 | Screw | 4 |
| 01***70 | Screw | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 08 Emergency Steering Pump And Pipings : Unit_02_of_02
| 01***45 | Screw | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
| 41***90 | O-Ring | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 09 Emergency Steering Pump : Unit_02_of_02
| 42***50 | Emer Steering Pump | 1 |
| 42***01 | Pump | 1 |
| 42***02 | Flange | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 09 Emergency Steering Pump : Unit_01_of_02
| 04***12 | Ring,Snap (For Ripper) | 1 |
| 42***50 | Emer Steering Pump | 1 |
| 42***00 | Ball Bearing | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 12 Valve Block
| 07***07 | O-Ring - (K10) | 1 |
| 07***12 | O-Ring, Divider Valve Mounting | 1 |
| 42***10 | Service Kit, Steering Demand Valve | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 15 Steering
| 42***23 | Poppet | 1 |
| 42***24 | Compression Spring | 1 |
| 42***25 | O-Ring | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 07 Steering : 23 Non-Return Valve
| 41***90 | O-Ring | 1 |
| 42***30 | Check Valve | 1 |
| 42***01 | Poppet | 1 |
08 Front Axle
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 08 Front Axle : 00 Front Axle
| 01***24 | Nut,Bearing | 8 |
| 01***60 | Flat Washer - M20 (Hardened) | 50 |
| 01***80 | Washer,(For Shipping) | 16 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 08 Front Axle : 01 Axle Insert
| 01***30 | Screw | 2 |
| 01***55 | Capscrew | 7 |
| 01***35 | Screw | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 08 Front Axle : 03 Brake
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 08 Front Axle : 08 Planetary Drive
| 01***20 | Screw | 24 |
| 01***50 | Bolt,(Not Used When With Cab) | 16 |
| 01***35 | Screw | 12 |
09 Brake System
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 01 Brake Piping, Front Axle : Unit_02_of_02
| 01***50 | Bolt (Kit) | 4 |
| 01***45 | Screw | 6 |
| 01***10 | Bolt,For Weight Adjusting Bolt | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 01 Brake Piping, Front Axle : Unit_01_of_02
| 01***50 | Bolt (Kit) | 4 |
| 01***45 | Screw | 6 |
| 01***10 | Bolt,For Weight Adjusting Bolt | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 02 Brake Piping, Rear Axle : Unit_02_of_02
| 01***16 | Bolt - Starting Motor Ground Cable | 12 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 10 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 02 Brake Piping, Rear Axle : Unit_01_of_02
| 01***16 | Bolt - Starting Motor Ground Cable | 12 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 10 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 05 Pressure Tank
| 42***39 | Valve Block | 1 |
| 42***40 | Cover | 1 |
| 42***41 | Screw | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 15 Brake Valve : Unit_01_of_04
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 41***10 | Safety Catch | 1 |
| 41***50 | Screw | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 15 Brake Valve : Unit_04_of_04
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 41***10 | Safety Catch | 1 |
| 41***50 | Screw | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 15 Brake Valve : Unit_02_of_04
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 41***10 | Safety Catch | 1 |
| 41***50 | Screw | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 15 Brake Valve : Unit_03_of_04
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 41***10 | Safety Catch | 1 |
| 41***50 | Screw | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 09 Brake System : 90 Hand Brake And Operating Assembly
| 01***25 | Screw | 2 |
| 01***10 | Bolt - Relay And Flasher Mounting | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 6 |
10 Frame
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 00 Front Frame
| 01***35 | Bolt,R.H. (For Add. Air Compressor) | 4 |
| 01***32 | Washer | 4 |
| 07***08 | Plug,(Without Oil Pressure Switch) | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 01 Rear Frame
| 01***65 | Capscrew | 16 |
| 01***35 | Bolt,(With Rops) | 2 |
| 01***90 | Screw | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 03 Hinge
| 01***95 | Screw | 4 |
| 01***25 | Bolt, Pinlock | 2 |
| 01***35 | Screw | 10 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 04 Rear Frame, Lubrication Pipe
| 01***16 | Bolt - Starting Motor Ground Cable | 18 |
| 04***10 | Clip - Fuel Sensor Harness | 22 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 6 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 06 Fender : Unit_01_of_02
| 01***30 | Bolt,(Not Used With Emergency Str.) | 8 |
| 01***16 | Bolt, Mounting Transmission Control Switch | 16 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 06 Fender : Unit_02_of_02
| 01***30 | Bolt,(Not Used When Towing Winch) | 8 |
| 01***16 | Bolt, Mounting Transmission Control Switch | 16 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 34 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 08 Bonnet
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 01***20 | Bolt - Mount Risers To Cab Floor | 4 |
| 01***25 | Bolt,L.H. (For Add. Air Compressor) | 20 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 09 Radiator Guard And Bonnet
| 01***80 | Capscrew | 4 |
| 01***85 | Screw | 4 |
| 01***12 | Screw,(For Side Lamp) (Not Shown) | 5 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 14 Platform
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***50 | Screw | 12 |
| 01***12 | Screw,Sems | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 10 Frame : 16 Ladder
| 01***20 | Bolt,(Forwarded Individually Parts) | 8 |
| 01***16 | Bolt - Starting Motor Ground Cable | 8 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
11 Drivers Cab
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 11 Drivers Cab : 00 Safety Cabin
| 01***95 | Bolt, Yoke Mounting | 6 |
| 01***40 | Screw | 2 |
| 01***40 | Screw | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 11 Drivers Cab : 01 Safety Cabin, Doors
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***12 | Screw,(With Articulate Indicator) | 8 |
| 01***25 | Bolt - Relay Mounting | 16 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 11 Drivers Cab : 04 R.O.P.S Canopy
| 01***35 | Bolt,(With Rops) | 2 |
| 01***25 | Bolt,L.H. (For Add. Air Compressor) | 2 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 11 Drivers Cab : 11 Soundproofing Of Cabin
| 01***12 | Bolt, Bolt,(No Need To Quick Shift) | 2 |
| 01***10 | Bolt - Relay And Flasher Mounting | 3 |
| 01***16 | Bolt, Mounting Transmission Control Switch | 6 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 11 Drivers Cab : 17 Ventilation
| 42***40 | Duct Assembly, Air | 1 |
| ND***20 | Screw With Washer, Tapping | 2 |
| ND***20 | Duct,Air | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 11 Drivers Cab : 18 Heater
| 01***20 | Bolt,(For Mono Lever Steering) | 3 |
| 01***10 | Bolt - Relay And Flasher Mounting | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 11 Drivers Cab : 19 Air Conditioner
| 42***02 | Engine | 1 |
| 42***11 | Actuater | 1 |
| 42***51 | Rod | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 11 Drivers Cab : 27 Drivers Seat, Attaching Parts
| 01***40 | Bolt,(For Position Fixing) | 2 |
| 01***25 | Bolt,Without Revolution Sensor | 4 |
| 01***25 | Bolt,L.H. (For Add. Air Compressor) | 4 |
12 Tools, Accessory, Lettering
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 00 Wedge And Attachement
| 04***10 | Pin,Cotter? (For Ripper) | 2 |
| 41***20 | Underl Wedge | 2 |
| 41***40 | Bonnet Fastener | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 01 Tools And Accessory
| 01***05 | Capscrew | 2 |
| 01***16 | Bolt, Mounting Transmission Control Switch | 2 |
| 01***16 | Washer, 1.6 mm Thick | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 02 Tools
| 07***03 | Cartridge - Grease | 1 |
| 09***06 | Wrench Set,8x10? 12x14? 13x17? | 1 |
| 09***00 | Wrench - Adjustable | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 03 Lettering
| 09***60 | Decal, Komatsu (Black Lettering) (Behind Driver'S Door) | 2 |
| 41***20 | Caution Plate | 2 |
| 42***10 | Characters | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 04 Decals, German : Unit_01_of_02
| 09***00 | Plate? Safety,Accumulator Warning | 6 |
| 09***00 | Tag,Do Not Operate (German) | 2 |
| 42***50 | Decal | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 04 Decals, German : Unit_02_of_02
| 09***00 | Tag,Do Not Operate (German) | 1 |
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 05 Decals, English : Unit_01_of_02
| 09***00 | Plate? Safety,(English) (Lettering Type) | 6 |
| 09***00 | Tag,(For South And North America) | 2 |
| 42***10 | Kit, Safety And Instruction | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 05 Decals, English : Unit_02_of_02
| 09***00 | Tag,(For South And North America) | 1 |
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 06 Decals, French : Unit_02_of_02
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
| 42***10 | Caution Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 06 Decals, French : Unit_01_of_02
| 09***00 | Decal, Safety, Explosion Hazard | 6 |
| 42***50 | Decal | 1 |
| 42***10 | Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 08 Decals, Italian : Unit_01_of_02
| 09***00 | Plate? Safety,Accumulator | 6 |
| 42***50 | Decal | 1 |
| 42***60 | Caution Plate | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 08 Decals, Italian : Unit_02_of_02
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
| 42***10 | Caution Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 09 Decals, Spanish : Unit_01_of_02
| 09***00 | Plate? Safety,Acc.(Spanish)(Cen.Sou.America) | 6 |
| 42***50 | Decal | 1 |
| 42***50 | Caution Plate | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 09 Decals, Spanish : Unit_02_of_02
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
| 42***10 | Caution Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 10 Decals, Swedish : Unit_01_of_02
| 42***50 | Decal | 2 |
| 42***60 | Decal | 1 |
| 42***80 | Caution Plate | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 10 Decals, Swedish : Unit_02_of_02
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
| 42***10 | Caution Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 11 Decals, Danish : Unit_01_of_02
| 42***50 | Decal | 2 |
| 42***80 | Decal | 1 |
| 42***00 | Caution Plate | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 11 Decals, Danish : Unit_02_of_02
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
| 42***30 | Caution Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 12 Decals, Finnish : Unit_02_of_02
| 41***90 | Decal | 1 |
| 42***11 | Decal | 1 |
| 42***70 | Caution Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 12 Decals, Finnish : Unit_01_of_02
| 42***50 | Decal | 2 |
| 42***20 | Decal | 1 |
| 42***40 | Caution Plate | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 13 Decals, Norwegian : Unit_02_of_02
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
| 42***50 | Caution Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 13 Decals, Norwegian : Unit_01_of_02
| 42***50 | Decal | 2 |
| 42***00 | Decal | 1 |
| 42***20 | Caution Plate | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 14 Decals, Dutch : Unit_02_of_02
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
| 42***10 | Caution Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 14 Decals, Dutch : Unit_01_of_02
| 42***50 | Decal | 2 |
| 42***60 | Decal | 1 |
| 42***80 | Caution Plate | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 15 Decals, Portuguese : Unit_02_of_02
| 41***90 | Decal | 1 |
| 42***51 | Decal | 1 |
| 42***90 | Caution Plate | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 15 Decals, Portuguese : Unit_01_of_02
| 42***50 | Decal | 2 |
| 42***40 | Decal | 1 |
| 42***60 | Caution Plate | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 16 Decals, Greek : Unit_01_of_02
| 42***50 | Decal | 2 |
| 42***00 | Decal | 1 |
| 42***20 | Caution Plate | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 12 Tools, Accessory, Lettering : 16 Decals, Greek : Unit_02_of_02
13 Hydraulic System
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 00 Pumps For Hydraulic System : Unit_02_of_02
| 01***30 | Screw | 2 |
| 01***45 | Screw | 4 |
| 01***40 | Screw | 16 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 00 Pumps For Hydraulic System : Unit_01_of_02
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***45 | Bolt,(For Travel Motor) (Not Show) | 4 |
| 01***40 | Screw | 16 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 03 Hydraulic Pump : Unit_02_of_02
| 01***45 | Washer, Spring | 4 |
| 04***28 | Pin, Dowel - Transmission Case, Pin-Dowel | 4 |
| 04***20 | Ring, Retaining | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 03 Hydraulic Pump : Unit_01_of_02
| 42***11 | Packing Kit | 2 |
| 42***03 | Shaft Seal | 2 |
| 42***04 | Repair Kit | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 06 Oil Tank : Unit_02_of_02
| 01***35 | Bolt,(With Rops) | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 6 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 6 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 06 Oil Tank : Unit_01_of_02
| 01***35 | Bolt, Hydraulic Tank Mounting | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 6 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 08 Pipings For Remote Control Valve : Unit_01_of_02
| 01***20 | Bolt,(Forwarded Individually Parts) | 3 |
| 01***16 | Bolt - Starting Motor Ground Cable | 10 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 3 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 08 Pipings For Remote Control Valve : Unit_02_of_02
| 01***20 | Screw | 3 |
| 01***10 | Bolt - Relay And Flasher Mounting | 2 |
| 01***40 | Screw | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 09 Remote Control Valve : Unit_02_of_02
| 41***06 | Retainer | 1 |
| 41***07 | Banjo Bolt | 1 |
| 41***40 | Remote Control Valve | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 09 Remote Control Valve : Unit_01_of_02
| 01***12 | Bolt,(See Fig. K0210-16a0) | 1 |
| 01***16 | Bolt, Mounting Transmission Control Switch | 8 |
| 01***25 | Bolt - Relay Mounting | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 10 Pressure Pipings To Control Valve : Unit_01_of_02
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***50 | Screw | 2 |
| 01***65 | Screw | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 10 Pressure Pipings To Control Valve : Unit_02_of_02
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***50 | Screw | 2 |
| 01***35 | Screw | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 11 Control Valve, Return Pipings
| 01***30 | Screw | 8 |
| 01***35 | Bolt,Shoe (Kit) | 4 |
| 01***20 | Screw | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 12 Control Valve : Unit_03_of_03
| 42***02 | O-Ring | 1 |
| 42***03 | O-Ring | 3 |
| 42***04 | O-Ring | 3 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 12 Control Valve : Unit_02_of_03
| 42***02 | O-Ring | 1 |
| 42***03 | O-Ring | 3 |
| 42***04 | O-Ring | 3 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 12 Control Valve : Unit_01_of_03
| 01***55 | Bolt - Mount Cage To Transmission Case | 4 |
| 01***75 | Screw | 3 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 7 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 25 Lift Cylinder And Pipings
| 01***35 | Screw | 44 |
| 01***60 | Screw | 8 |
| 01***65 | Screw | 12 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 26 Lift Cylinder : Unit_01_of_02
| 01***40 | Bolt,(Dust And Dirt Protection) | 6 |
| 01***60 | Capscrew | 12 |
| 01***45 | Washer, Spring | 12 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 26 Lift Cylinder : Unit_02_of_02
| 01***40 | Bolt,(Dust And Dirt Protection) | 6 |
| 01***60 | Capscrew | 12 |
| 01***45 | Washer, Spring | 12 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 27 Bucket Cylinder And Pipings
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***00 | Bolt,For Weight Adjusting Bolt | 2 |
| 01***30 | Screw | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 28 Bucket Cylinder : Unit_02_of_02
| 01***45 | Bolt,(Cold Terrain Spec.) | 6 |
| 01***75 | Capscrew | 12 |
| 01***60 | Flat Washer - M20 (Hardened) | 12 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 28 Bucket Cylinder : Unit_01_of_02
| 01***45 | Bolt,(Cold Terrain Spec.) | 6 |
| 01***75 | Capscrew | 12 |
| 01***60 | Flat Washer - M20 (Hardened) | 12 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 13 Hydraulic System : 40 Pipings For Accessory Equipment
14 Boom, Thrust Frame - Arm
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 14 Boom, Thrust Frame - Arm : 00 Boom
| 01***30 | Bolt - Pin Mounting | 13 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 16 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 8 |
15 Equipment
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 00 Bucket
| 42***50 | Corner Cutter | 1 |
| 42***60 | Corner Cutter | 1 |
| 42***50 | Skid | 4 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 10 Ripper Tooth Wear Plate And Marker Light
| 01***70 | Bolt - Bracket And Oil Inlet Tubemounting | 2 |
| 01***16 | Screw,(For Air Conditioner Less) | 4 |
| 01***50 | Wing Nut | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 12 Bucket Position Indicator : Unit_02_of_02
| 01***16 | Bolt - Starting Motor Ground Cable | 2 |
| 01***20 | Bolt - Mount Risers To Cab Floor | 4 |
| 01***25 | Bolt,L.H. (For Add. Air Compressor) | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 12 Bucket Position Indicator : Unit_01_of_02
| 01***20 | Bolt - Mount Risers To Cab Floor | 4 |
| 01***25 | Bolt,L.H. (For Add. Air Compressor) | 2 |
| 01***35 | Bolt,R.H. (For Add. Air Compressor) | 2 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 62 A.L.S. Equipment : Unit_03_of_03
| 42***70 | Pressure Tank | 1 |
| 42***01 | Pressure Tank | 2 |
| 42***02 | Two Way Valve | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 62 A.L.S. Equipment : Unit_02_of_03
| 01***30 | Screw | 28 |
| 01***20 | Bolt - Mount Risers To Cab Floor | 10 |
| 01***55 | Bolt,(With Joy Stick Steering) | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 62 A.L.S. Equipment : Unit_01_of_03
| 01***30 | Screw | 28 |
| 01***20 | Bolt - Mount Risers To Cab Floor | 10 |
| 01***55 | Bolt,(With Joy Stick Steering) | 8 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 70 Central Lubrication : Unit_02_of_03
| 42***10 | Nut | 8 |
| 42***90 | Plate | 7 |
| 42***00 | Plate | 6 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 70 Central Lubrication : Unit_03_of_03
| 01***16 | Bolt - Starting Motor Ground Cable | 8 |
| 04***10 | Clip - Fuel Sensor Harness | 8 |
| 42***80 | Cable Kit | 1 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 70 Central Lubrication : Unit_01_of_03
| 42***10 | Screw | 7 |
| 42***60 | Plain Washer | 3 |
| 42***70 | Nut | 10 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 76 Counterweight
| 01***25 | Screw | 4 |
| 01***90 | Bolt, Adjusting | 5 |
| 01***32 | Threaded Bush | 5 |
Komatsu : Wa420-3h Active(S/N Wa420h30297-Up) : 15 Equipment : 89 Special Equipment Italy
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***60 | Bolt,(F4320-52a0 -5- ) | 2 |
| 01***60 | Screw | 1 |
WA420-3H ACTIVE(S/N WA420H30297-Up) serial number reference
The PIN plate is located on the front frame, typically on the right-hand side of the articulation joint. To read the prefix, identify the first three characters of the 17-character ISO PIN or the alphanumeric code following the model designation on the chassis plate. For this specific serial range (30297-Up), the engine is the SAA6D114E-1.
| Prefix | Identifies | Notes |
|---|---|---|
| H | WA420-3H ACTIVE (S/N 30297-Up) | Identifies the 'Active' configuration within the WA420-3 series. Serial range starts at 30297, following the H30296 break. Engine is SAA6D114E-1. |
Frequently asked questions
What engine is installed in the WA420-3H ACTIVE?
The machine is powered by a Komatsu SAA6D114E-1 engine, which is a 4-cycle, water-cooled, in-line, 6-cylinder, direct injection engine equipped with a turbocharger.
What is the operating weight of this model?
The operating weight varies by configuration and serial range; documented values include approximately 20,020 kg (44,138 lb) and up to 44,357.1 lb.
What replaced the WA420-3 series?
The machine is part of a lineage that includes newer models such as the WA430-5 and WA470-8.
What WA420-3H ACTIVE(S/N WA420H30297-Up) owners discuss
What are the common transmission and gear selection issues reported for the WA420-3 series?
Operators have reported gear selection failures and difficulties accessing fault codes on the control panel. For diagnosing these issues, technicians should use a compatible diagnostic tool at the onboard connector located near the operator's seat to check for transmission or ECU faults. The transmission is a fully automatic 4-speed full powershift featuring 'kickdown' and 'gear-hold' functions.
What engine is installed in the Komatsu WA420-3H ACTIVE (S/N WA420H30297-Up)?
This specific serial range (WA420H30297 and up) is equipped with a Komatsu SAA6D114E-1 engine, which is a 4-cycle, water-cooled, in-line, 6-cylinder, direct injection engine featuring a turbocharger.
What are the known electrical and A/C system vulnerabilities for this machine?
The A/C system is prone to compressor failure and refrigerant leaks, leading to cooling inefficiency. Additionally, control unit failures have been documented where burnt-out chips cause the A/C to cycle on and off at approximately 1 second intervals when the ignition is turned on.
What are the standard fluid capacities for the hydraulic and transmission systems?
The hydraulic system has a fluid capacity of 210 L (55.5 gal). The transmission fluid capacity is 60 L (15.9 gal). For axle maintenance, both the front and rear axle/differential fluid capacities are 60 L (15.9 gal).
What should a buyer check when inspecting a used WA420-3H ACTIVE?
Verify the exact serial number to confirm engine and specification configuration, as components vary significantly between serial ranges (e.g., differences exist between H30296 and H30297 and up). Inspect the A/C control unit for signs of electronic failure and check the transmission for proper engagement of the 'kickdown' and 'gear-hold' features.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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