Komatsuwheel loadersmall ( - wa120 / sk*)
Komatsu WB70A-1(S/N F10392-Up)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu WB70A-1 (S/N F10392-Up) is a compact wheeled loader-backhoe, not a plain wheel loader: a front loader bucket and 4-in-1 multipurpose bucket option pair with a rear backhoe boom, arm, and dipper on one rigid, four-wheel-drive chassis. Power comes from the Komatsu 4D98E-1FA, a four-cylinder diesel built on the Yanmar 4TNE98 block, rated 52.8 kW (70.8 hp) net at 2,500 rpm (SAE J1349), driving a hydrostatic transmission with four forward and four reverse ranges. Operating weight is 5,650 kg (12,456 lb) standard, rising to 6,400 kg (14,110 lb) in a full configuration, depending on cab, counterweight, and attachments fitted. Komatsu Italia Manufacturing S.p.A. builds the machine on a Fiat-Hitachi-derived platform, the smallest position in the wider WB70/91/93/95/97/98 loader-backhoe family sold mainly into European and emerging markets. This exact F10392-Up serial block sits between an F10001 opening break and an F10950 follow-on break and ties to a short 2006 production run; Komatsu's own documentation does not confirm a direct predecessor for this exact size class. Factory configurations include an open-canopy or enclosed heated cab, standard or extended-reach backhoe dipper, rear outrigger stabilizers, a jig-arm side-digging-boom for offset trenching, and a hydraulic-hammer mounting kit at the dipper.
Across the WB70/91/93/95/97/98 family, Komatsu carried the platform forward into steadily heavier, more electronic machines: later WB93/97-class updates added electronic engine management, four-wheel-steer systems (2WS/4WS/crab, denoted by the R suffix), and successive emissions-tier engines through the -2, -5, and current -8 generations. The WB70A-1 predates that shift: mechanically governed 4D98E, mechanical injection pump, no aftertreatment, no onboard diagnostics. That keeps it simple to maintain, but it also means Komatsu never carried this exact sub-6.5-tonne size class forward into its current lineup. In the used and parts market today, WB70A-1 units trade on that simplicity: a Yanmar-derived diesel with wide aftermarket parts support, a straightforward hydrostatic drivetrain shared across the loader and backhoe circuits, and lower purchase and repair cost than a modern compact loader-backhoe. Because Komatsu's current backhoe range starts in the heavier WB93 class, WB70A-1 buyers today are typically utility contractors, municipalities, and rental fleets running small-lot excavation, trenching, and yard work who don't need a machine a size class up.
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 WB70A-1(S/N F10392-Up) specifications
Engine
| Engine model | Komatsu 4D98E-1FA, 4-cylinder diesel |
| Net power (SAE J1349) | 52.8 kW / 70.8 hp @ 2,500 rpm |
| Displacement | 3.3 L (3,318 cc) |
| Max torque | 251 Nm (185.2 lb ft) @ 1,200 rpm |
Weights
| Operating weight (standard, 4WD) | 5,650 kg (12,456 lb) |
| Maximum weight (full configuration/options) | 6,400 kg (14,110 lb) |
Dimensions
| Transport length | 5.27 m (17.29 ft) |
| Transport width | 1.85 m (6.07 ft) |
| Transport height | 3.09 m (10.15 ft) |
| Height to top of cab | 2.66 m (8.73 ft) |
| Wheelbase | 2.15 m (7.06 ft) |
| Ground clearance | 0.44 m (1.45 ft) |
| Tire size, front/rear | 12.5 x 20 |
Performance
| Max travel speed, forward/reverse | 39 km/h (24.3 mph), hydrostatic transmission, 4 forward/4 reverse |
| Backhoe dig depth, standard (folded) | 3.68 m (12.06 ft) |
| Backhoe dig depth, extended (unfolded) | 4.39 m (14.41 ft) |
| Backhoe reach from swivel, standard | 4.67 m (15.31 ft) |
| Backhoe reach from swivel, extended | 5.32 m (17.45 ft) |
| Backhoe bucket digging force, standard | 4,200 kg (9,259 lb) |
| Loader bucket breakout force | 4,397 kg (9,694 lb) |
| Loader lift capacity at full height | 2,110 kg (4,652 lb) |
| Loader max dump clearance | 2.48 m (8.14 ft) |
| Loader reach at max dump height | 0.87 m (2.86 ft) |
| Standard loader bucket capacity | 0.7 m³ (0.92 yd³) |
| Hydraulic pump flow | 116 L/min (30.7 gal/min), two gear pumps |
| Hydraulic system relief pressure | 200 bar (2,901 psi) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
WB70A-1(S/N F10392-Up) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase, with filter | 10 L (2.6 US gal) | Diesel engine oil meeting API CD-SG / MIL-L-2104E / CCMC D2-G2. Below 0°C (32°F) use SAE 10W or SAE 20W-20, even if daytime temperature rises to 10°C (50°F); SAE 30 in mild climates; SAE 40 in hot climates; SAE 15W-40 multigrade covers a wide temperature band. |
| Cooling system | 15 L (4.0 US gal) | Water mixed with permanent-type (ethylene-glycol base) antifreeze/coolant; plain water only where freeze protection is not required. |
| Fuel tank | 70 L (18.5 US gal) | Diesel fuel. |
| Hydrostatic transmission and hydraulic circuit, including tank | Refill, loader only: 65 L (17.2 US gal). Total system (specified): approx. 100 L (26.4 US gal) loader only, approx. 133 L (35.1 US gal) with backhoe attached — the higher figure is oil held in lines, motors and cylinders that stays in the system on a routine drain. | ATF, Dexron-type automatic transmission fluid, shared across the closed-circuit hydrostatic drive and hydraulic system. |
| Front axle differential/center housing | 4 L (1.1 US gal) differential; approx. 1.7 L (0.45 US gal) in the separate front axle reduction housing | UTTO (Universal Tractor Transmission Oil) fluid. |
| Front wheel final reduction gear, each side | 0.9 L (0.24 US gal) per side | UTTO fluid, same spec as the axle differential. |
| Rear axle differential | 5.2 L (1.4 US gal) | UTTO fluid. |
| Rear wheel final reduction gear, each side | 0.9 L (0.24 US gal) per side | UTTO fluid, same spec as the axle differential. |
| Braking system | 0.5 L (0.13 US gal) | ATF, Dexron-type fluid, same as the hydrostatic/hydraulic circuit. |
| Grease, chassis and pin lubrication points | Not a fill capacity — service each grease point per the lubrication interval chart. | Not documented in the accessible source text for this exact serial range. General Komatsu chassis practice for this class of machine calls for a lithium-base, NLGI No. 2, extreme-pressure multipurpose grease; confirm exact spec with a Komatsu dealer for this machine. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu WB70A-1(S/N F10392-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 WB70A-1(S/N F10392-Up) beyond the schedule
Predictive Maintenance & Fluid Analysis
The 4D98E's mechanical injection pump and hydrostatic drive give no onboard fault codes, so fluid sampling is the main early-warning tool here. Pull engine oil at every 500-hour change and check for silica (dust past the air filter) and coolant traces. The hydrostatic transmission and hydraulic circuit share one ATF-type oil across pumps, motors, and cylinders; sample it at the 1,000- and 2,000-hour changes, since hydrostatic gear is unforgiving of contamination. Watch the front and rear axle UTTO oil for metal fines that flag differential or final-drive wear.
Corrective & Common Repairs
Wear concentrates at the backhoe linkage and hydrostatic drive on this WB70A-1. Expect pin and bushing wear at the boom, dipper, and bucket pivots, plus cylinder seal leaks on the outriggers and the jig-arm side-digging-boom cylinder from repeated offset-digging cycles. Loss of travel speed or power under load on the hydrostatic transmission usually traces to internal pump or motor wear, or degraded ATF-type fluid, not the mechanically governed 4D98E. Check starter and alternator wiring regularly; corrosion here is a common no-start complaint on machines this age.
Overhaul & Rebuild Points
Rebuild candidates on a high-hour WB70A-1 start with the 4D98E's Yanmar-derived block: injectors and injection pump wear predictably and respond to factory-spec rebuild kits. The hydrostatic pump and drive motor are the next major line item; plan a full reseal and internal inspection once travel performance drops. Front and rear axle differentials and their final-drive gearsets, each filled separately with UTTO oil, are rebuildable units rather than throwaway assemblies. Pin bores on the loader arms, backhoe boom, and dipper often need line-boring and bushing replacement after years of digging cycles.
Seasonal & Environment Servicing
Match engine oil viscosity to season: SAE 10W or 20W-20 below 0°C even if daytime temperatures reach 10°C, SAE 30 in mild climates, SAE 40 in hot climates, or a 15W-40 multigrade year-round. Check antifreeze concentration before winter; cold starts on the mechanically governed 4D98E depend on battery condition and correct coolant mix. Drain water from the fuel tank often in humid climates, since the mechanical injection pump doesn't tolerate water contamination. Grease loader and backhoe pivot pins daily, or more often, in wet, sandy, or abrasive digging conditions.
WB70A-1(S/N F10392-Up) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| YM102103-55520 | O-Ring,(For Fuel Filter) | Fuel system service | Check fitment → |
| YM129470-55610 | Body, Fuel Filter | Fuel system service | Check fitment → |
| 848101094 | Pre-Fuel Filter (Optional) | Fuel system service | Check fitment → |
| 848001085 | Air Filter, Assembly | Air intake service | Check fitment → |
| 816214465 | Air Filter, Assembly | Air intake service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
WB70A-1(S/N F10392-Up) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Engine Oil Pressure Warning Lamp (red, oil-can symbol) | Engine oil pressure has dropped below the safe minimum for running the engine. | Low oil level, clogged oil filter, worn oil pump, worn bearings, or a faulty pressure sender/switch. | Stop the engine immediately. Check oil level and filter condition before restarting; do not run the engine again until the cause is found. |
| Coolant Temperature Warning Lamp (red, thermometer symbol) | Engine coolant temperature has gone above the normal operating range. | Low coolant level, clogged radiator core or screen, loose or broken fan belt, faulty thermostat, or water pump failure. | Idle down, move to a safe spot, and stop the engine. Let it cool, then check coolant level and radiator fins before restarting. |
| Battery Charge Warning Lamp (red, battery symbol) | Alternator is not charging the battery while the engine runs. | Slipping or broken fan/alternator belt, faulty alternator, or a loose or corroded wiring connection. | Check belt tension and battery terminal/wiring connections. Have the alternator tested if the lamp stays lit with the engine running. |
| Air Cleaner Restriction Indicator | Intake air filter element is clogged enough to restrict airflow to the engine. | Dirty or clogged air filter element from dusty jobsite operation, or a collapsed/torn element. | Inspect the air filter element; clean or replace it, and check the intake tubing for leaks or damage. |
| Fuel Level Gauge / Low Fuel Warning | Fuel remaining in the tank is at or near the reserve level. | Normal fuel consumption without refueling, or a fuel gauge sender fault if the reading is inaccurate. | Refuel with clean diesel. If the engine loses power or stalls from running dry, bleed air from the fuel system before restarting. |
| Glow Plug / Engine Preheat Indicator Lamp | Shows that the cold-start preheat cycle is active or has finished. | Normal cold-weather starting aid cycle; a lamp that will not go out can point to a glow plug or preheat circuit fault. | Wait for the lamp to go out before cranking in cold weather. If it never goes out, have the preheat circuit and glow plugs checked. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
WB70A-1(S/N F10392-Up) attachments & work tools
Front loader bucket
General-purpose front bucket runs around 0.7 m³ (0.9 yd³) at roughly 1.85 m (73 in) width, matched to this loader-backhoe's lift and breakout ratings. A 4-in-1 multi-purpose bucket (load, dose, grab, backdrag) is offered for this size class as an alternative to the plain GP bucket.
Front pallet forks
Top-mounted or clamp-on bucket forks fit over the existing front bucket for material and pallet handling without swapping the bucket off. Rated capacity for this loader class typically falls in the 2.5-3.5 t (5,500-8,000 lb) range, frame-dependent.
Backhoe digging buckets
Rear backhoe buckets range from narrow trenching widths up to a wider general-purpose bucket, sized to the standard dipper's dig force rating. Width selection varies by configuration and application; confirm against the specific dipper fitted.
Extendable dipper (extendahoe)
This model is offered in a standard-reach backhoe configuration and an extended-reach configuration, the latter adding roughly 1.2-2.1 m (4-7 ft) of load height, reach, and dig depth over standard. Extended-reach dippers use the same bucket mounting as standard but change hydraulic cylinder stroke.
Side-shift / offset digging boom (jig arm)
The backhoe assembly carries a jig arm and side-digging-boom arrangement with its own cylinder, letting the boom swing off-center to dig alongside walls, curbs, or trenches without repositioning the machine. This side-shift/offset-boom function is common across the WB backhoe-loader family and shares the main boom's hydraulic circuit.
Hydraulic hammer / breaker mount
The backhoe boom accepts a hydraulic hammer in place of the digging bucket, using a dedicated auxiliary hydraulic piping kit routed to the dipper end for one-way breaker flow. Hammer sizing should stay within the class-typical light-to-medium breaker range for this dipper's dig-force rating.
Backhoe auger (earth drill)
A hydraulic-driven auger/earth-drill unit can be mounted at the dipper in place of the bucket for post-hole and footing work, powered off the same auxiliary hydraulic circuit used for the hammer. Auger diameter and torque selection depend on the drive unit fitted, not the base machine.
Bucket coupler / mounting system
Standard bucket-to-dipper and loader-to-bucket connections use pin-and-bushing (pin-on) mounting. A mechanical pin-grabber or hydraulic quick coupler can be fitted at the backhoe dipper as a factory or dealer option for faster tool changes between bucket, hammer, and auger.
Rear outrigger stabilizers
Rear outrigger/stabilizer legs are standard equipment on this model, lowered hydraulically to level and steady the machine during digging. They are independent of the front loader arms and only affect backhoe-end stability.
All WB70A-1(S/N F10392-Up) assemblies by section
Every catalogued assembly group for the Komatsu WB70A-1(S/N F10392-Up). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Control System
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Backhoe Control Lever
| 31***54 | Support | 1 |
| 31***24 | Link | 2 |
| 31***25 | Tie-Rod | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Backhoe Control Pedal (For Hammer)
| 31***00 | Tie-Rod | 1 |
| 31***56 | Support | 1 |
| 31***60 | Pedal | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Backhoe Control Pedal (For Jig Arm)
| 31***00 | Tie-Rod | 1 |
| 31***56 | Support | 1 |
| 31***60 | Pedal | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Backhoe Control Pedal (For Side Digging Boom)
| 31***00 | Tie-Rod | 1 |
| 31***56 | Support | 1 |
| 31***60 | Pedal | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Brake Pedal
| 36***60 | Pedal | 1 |
| 36***17 | Pin | 1 |
| 36***23 | Pin | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Bucket - 4 In 1 Control Lever
| 36***70 | Handle | 1 |
| 39***66 | Tie-Rod | 1 |
| 50***25 | Spacer | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Control Inching Pedal Unit
| 36***07 | Plate | 1 |
| 39***65 | Tie-Rod | 1 |
| 39***70 | Hose | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Fuel Control Lever
| 31***10 | Dowel | 1 |
| 36***65 | Cable, Assembly | 1 |
| 36***66 | Support | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Outrigger Control Lever
| 31***48 | Command Boot | 2 |
| 31***51 | Link | 1 |
| 31***25 | Tie-Rod | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Shovel Control Lever
| 31***51 | Knob | 1 |
| 36***93 | Catch | 1 |
| 36***64 | Link | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Control System : Steering Wheel, Column And Unit
| 31***07 | Pin | 1 |
| 36***67 | Steering Wheel, Assembly | 1 |
| 36***61 | Support | 1 |
Cylinder Head
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Air Intake Manifold
| YM***02 | Screw | 2 |
| YM***00 | Manifold,Air Intake | 1 |
| YM***21 | Gasket (Kit) | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Camshaft And Driving Gear
| YM***20 | Gear Assembly., Hydraulic Pump | 1 |
| YM***00 | O-Ring | 1 |
| YM***10 | Gear, Assembly | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Cooling Water System
| 88***24 | Water Temperature Transmitter (Instrument) | 1 |
| YM***50 | V-Belt | 1 |
| YM***02 | Screw | 3 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Crankshaft And Piston
| YM***50 | Ring Set (+0.25 mm) | 4 |
| YM***80 | Flywheel, Assembly | 1 |
| YM***00 | Connecting Rod, Assembly | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Cylinder Block
| YM***60 | Cylinder Block, Assembly | 1 |
| YM***00 | Screw | 18 |
| YM***00 | Main Metal Ass'Y (Std) | 5 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Cylinder Head
| YM***80 | Retainer, Spring | 8 |
| YM***40 | Seal,Valve? Exhaust (Kit) | 4 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Engine Stop Device
| 87***14 | Engine, Assembly | 1 |
| YM***00 | Pin, Cotter | 2 |
| YM***20 | Link | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Exhaust Manifold
| YM***02 | Nut | 2 |
| YM***22 | Stud | 4 |
| YM***01 | Gasket (Kit) | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Feed Pump
| YM***40 | Gasket | 4 |
| YM***60 | O-Ring | 2 |
| YM***00 | Screw | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Flywheel - Lubricating Oil Sump
| YM***52 | Screw | 9 |
| YM***10 | Oil Sump | 1 |
| YM***20 | Housing, Flywheel | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Fuel Injection Line
| YM***02 | Bolt Plated | 1 |
| YM***50 | Nozzle | 4 |
| YM***40 | Injection Pipe N. 4 | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Fuel Injection Pump
| YM***00 | Segment | 4 |
| YM***00 | Gasket Disc | 4 |
| YM***20 | Valve,Delivery | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Fuel Line
| YM***02 | Bolt | 2 |
| YM***02 | Screw | 1 |
| YM***10 | Banjo Fitting | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Gasket Set - Tool
| YM***40 | Seal,Valve? Exhaust (Kit) | 4 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***00 | O-Ring | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Gear Housing
| YM***02 | Bolt Plated | 3 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***02 | Screw | 10 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Generator
| YM***41 | Cover, Rear | 1 |
| YM***50 | Cable | 1 |
| YM***80 | Pulley | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Governor
| YM***40 | Screw | 2 |
| YM***00 | Nut | 1 |
| YM***00 | Screw | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Lubricating Oil System
| YM***40 | Stud | 1 |
| YM***81 | Retainer | 1 |
| YM***00 | O-Ring (Kit) | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Cylinder Head : Starting Motor
Engine Related Parts And Electrical System
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Air Cleaner
| 36***82 | Pipe | 1 |
| 36***86 | Sleeve | 1 |
| 36***62 | Sleeve | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Dashboard
| 31***54 | Rear Box | 1 |
| 31***57 | Front Instrument Board | 1 |
| 80***60 | Screw | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Electrical System (1/3)
| 36***50 | Support | 2 |
| 36***51 | Support | 2 |
| 36***05 | Support | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Electrical System (2/3)
| 36***25 | Support | 1 |
| 36***50 | Support | 1 |
| 50***06 | Battery Retainer, Rear | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Electrical System (3/3)
| 80***40 | Screw | 2 |
| 80***04 | Self-Locking Nut | 1 |
| 80***08 | Washer (Optional) | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Engine Mounting Part
| 36***72 | Support, Front | 2 |
| 36***73 | Support, Rear | 2 |
| 80***08 | Bolt (Only With Cabin) | 16 |
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Fuel Piping
| 50***13 | Union | 2 |
| 80***84 | Screw | 2 |
| 80***51 | Bolt | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Fuel Tank
| 20***59 | Plug | 1 |
| 35***12 | Flange | 1 |
| 36***55 | Fuel Level | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Muffler
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Power Take Off
| 36***74 | Support | 1 |
| 80***09 | Screw | 12 |
| 80***10 | Bolt (Canopy) | 8 |
Komatsu : Wb70a-1(S/N F10392-Up) : Engine Related Parts And Electrical System : Radiator
| 36***68 | Tank | 1 |
| 36***67 | Plug | 1 |
| 36***71 | Radiator, Assembly | 1 |
Frame
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Counter Weight
| 20***47 | Link | 1 |
| 31***34 | Gasket | 1 |
| 31***50 | Pin | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Frame Articulation
| 35***53 | Pin | 1 |
| 35***08 | Flange | 1 |
| 35***09 | Flange | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Front Axle (1/5)
| 80***96 | Bolt | 8 |
| 80***29 | Bearing | 1 |
| 80***04 | Bearing | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Front Axle (2/5)
| 80***65 | Bolt | 2 |
| 80***96 | Bolt | 22 |
| 80***08 | Spring Washer (For Hydraulic Lock) | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Front Axle (3/5)
| 80***10 | Circlip | 1 |
| HU***38 | Dowel | 1 |
| HU***10 | Plug | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Front Axle (4/5)
| 80***94 | Bolt | 8 |
| 80***31 | Bolt | 12 |
| 80***15 | Peg | 3 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Front Axle (5/5)
| 80***22 | Washer | 2 |
| 80***78 | Ring | 2 |
| 85***27 | Ring | 6 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Front Frame
| 35***71 | Cover | 1 |
| 36***63 | Frame, Front | 1 |
| 36***64 | Frame, Front, Assembly | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Hand Brake Control Lever
| 36***22 | Fasterner Cable | 2 |
| 36***62 | Control Cable | 1 |
| 80***36 | Screw | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Hydraulic Piping (Brake Line)
| 20***10 | Clamp | 3 |
| 35***51 | Union | 1 |
| 36***50 | Pipe | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Hydraulic Piping (Differential Locking)
| 39***43 | Hose | 1 |
| 39***36 | Hose | 1 |
| 39***38 | Hose | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Hydraulic Piping (Frame Oscillation Locking)
| 36***00 | Cylinder | 1 |
| 36***50 | Cylinder, Assembly | 1 |
| 36***51 | Piston Rod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Hydraulic Piping (Gear Control)
| 39***37 | Hose | 2 |
| 50***45 | Union (For Hydraulic Lock) | 2 |
| 50***05 | Elbow | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Joint And Steering Cylinder Lubrication Piping
| 39***26 | Hose | 2 |
| 39***39 | Hose | 1 |
| 50***03 | Elbow | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Rear Axle (1/4)
| 80***09 | Nut (Version B) | 32 |
| 80***10 | Circlip | 1 |
| 85***46 | O-Ring | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Rear Axle (2/4)
| 80***41 | Bolt | 2 |
| 80***09 | Screw | 12 |
| 80***10 | Bolt (Canopy) | 8 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Rear Axle (3/4)
| 80***22 | Washer | 2 |
| 80***78 | Ring | 2 |
| 85***27 | Ring | 6 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Rear Axle (4/5)
| 80***68 | Bolt | 4 |
| 80***92 | Screw | 2 |
| 80***86 | Grub Screw | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Rear Frame
| 36***66 | Frame, Rear | 1 |
| 36***80 | Plate | 2 |
| 36***58 | R.H. Case | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Rear Propeller Shaft And Travel Motor
| 36***50 | Propeller Shaft | 1 |
| 80***10 | Bolt (Canopy) | 16 |
| 80***39 | Bolt | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Steering Cylinder
| 20***54 | Cylinder, Assembly | 2 |
| 20***40 | Cylinder | 1 |
| 20***11 | Piston Rod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Top Guard
| 31***34 | Gasket | 1 |
| 36***12 | Sheet | 1 |
| 36***13 | Mat | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Frame : Wheels
| 35***51 | Rim (13x18) (Optional) | 4 |
| 36***50 | Rim (11x20) | 4 |
| 81***94 | Tyre (405/70) (Optional) | 4 |
Guard And Operator'S Cab
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Backohe Cover
| 31***52 | Support | 1 |
| 31***34 | Gasket | 1 |
| 31***37 | Support | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Cabin (1/7)
| 30***65 | Operator'S Cab, Assembly | 1 |
| 80***09 | Screw | 2 |
| 80***19 | Bolt | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Cabin (2/7)
| 31***85 | Handle, External, R.H | 1 |
| 31***86 | Handle, External | 1 |
| 80***46 | Bolt | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Cabin (4/7)
| 80***67 | Bolt (Optional) | 1 |
| 80***91 | Bolt | 2 |
| 80***09 | Screw | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Cabin (5/7)
| 80***69 | Bolt (With Stabilizers Only) | 4 |
| 80***04 | Screw | 2 |
| 80***78 | Wheel | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Cabin (6/7)
| 36***95 | Screw | 25 |
| 36***09 | Cover, Lower, Rear, L.H | 1 |
| 36***11 | Cover, Front, R.H | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Cabin (7/7)
| 80***93 | Screw | 4 |
| 80***65 | Bolt (Cabin) | 8 |
| 80***68 | Screw | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Cabina (3/7)
| 80***67 | Bolt (Optional) | 4 |
| 80***91 | Bolt | 5 |
| 80***97 | Screw | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Covers - Panels
| 31***53 | Plug | 1 |
| 31***15 | Plug | 1 |
| 36***14 | Front Dashboard | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Heating System
| 36***01 | Hose | 2 |
| 39***18 | Elbow | 2 |
| 50***18 | Union | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Operator'S Seat
| 31***14 | Operator'S Seat Stand | 1 |
| 36***76 | Operator'S Seat, Assembly | 1 |
| 80***09 | Screw | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Guard And Operator'S Cab : Soundproofing
| 36***02 | Sheet | 1 |
| 36***03 | Sheet | 1 |
| 36***04 | Sheet | 1 |
Mark Plate
Komatsu : Wb70a-1(S/N F10392-Up) : Mark Plate : Equipment (Tbg Version 20 Km/H)
| 36***00 | Support | 2 |
| 80***86 | Washer | 8 |
| 80***08 | Nut (With Stabilizers Only) | 8 |
Komatsu : Wb70a-1(S/N F10392-Up) : Mark Plate : Equipment (Tbg Version 37 Km/H) (1/2)
| 36***50 | Support | 1 |
| 36***51 | Support | 1 |
| 36***52 | Support | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Mark Plate : Equipment (Tbg Version 37 Km/H) (2/2)
| 36***00 | Support | 2 |
| 36***00 | Plate, Max. Speed 37 Km/H (Germany) | 3 |
| 36***14 | Gasket | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Mark Plate : Mark Plate
| 31***25 | Plate, Operation | 1 |
| 31***26 | Plate, Operating Arm And Bucket | 1 |
| 31***27 | Plate, Operating Left Outrigger | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Mark Plate : Safety Devices For Circulation On Roads
| 35***50 | Protection Tooth L=1920 (For Bucket 4 1n 1) | 1 |
| 36***51 | Protection Tooth L=1850 | 1 |
| 36***51 | Protection Tooth L=2000 | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Mark Plate : Tool
| 80***10 | Wrench | 1 |
| 82***35 | Grease Pump | 1 |
| 82***43 | Filter Cartridge Wrench | 1 |
Work Equipment
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Angle-Dozer
| 20***20 | Pin | 3 |
| 20***23 | Tie-Rod | 1 |
| 20***63 | Connection | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Arm
| 20***13 | Pin | 2 |
| 33***53 | V-Belt | 1 |
| 35***51 | Pushrod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Arm And Bucket
| 20***93 | Lever, R.H | 1 |
| 20***95 | Tie-Rod | 1 |
| 20***05 | Lever, L.H | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Arm Cylinder
| 20***60 | Arm Cylinder, Assembly | 1 |
| 20***02 | Cylinder | 1 |
| 20***02 | Piston Rod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Arm Cylinder (For Side Digging Boom)
| 20***76 | Arm Cylinder, Assembly | 0 |
| 20***01 | Cylinder | 1 |
| 20***02 | Piston Rod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Backhoe Frame And Outrigger
| 20***24 | Chain (With Stabilizers Only) | 2 |
| 20***47 | Link | 1 |
| 20***50 | Foot, R.H | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Boom Cylinder
| 39***02 | Pin | 1 |
| 39***02 | Boom Cylinder, Assembly | 1 |
| 39***11 | Cylinder | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Boom Swing Cylinder
| 20***63 | Boom Swing Cylinder, R.H | 1 |
| 20***64 | Boom Swing Cylinder, L.H | 1 |
| 20***01 | R.H. Cylinder | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Bracket
| 31***13 | Pin | 1 |
| 31***50 | Bracket | 1 |
| 31***00 | Support | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Bracket And Boom
| 20***28 | Pin | 2 |
| 20***29 | Pin | 1 |
| 31***50 | Bracket, Assembly | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Bucket 4 In 1
| 31***54 | Tooth | 6 |
| 31***77 | Pin | 2 |
| 35***09 | Pin | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Bucket 4 In 1 Cylinder
| 35***57 | Cylinder, Assembly | 2 |
| 35***00 | Cylinder | 1 |
| 35***01 | Piston Rod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Bucket And Levers
| 20***91 | Pin | 2 |
| 20***10 | Pin | 1 |
| 20***12 | Pin | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Bucket Cylinder
| 20***61 | Bucket Cylinder, Assembly | 1 |
| 20***03 | Cylinder | 1 |
| 20***03 | Piston Rod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Fork
| 35***00 | Stopper | 1 |
| 35***00 | Protection | 1 |
| 35***03 | Plate | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Hammer M50 (1/2)
| 82***33 | Chisel Point (Optional) | 1 |
| 82***38 | Flat Point (Optional) | 1 |
| 82***39 | Pyramid Point (Optional) | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Hammer M50 (2/2)
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Hydraulic Fast Coupling
| 20***50 | Pin | 2 |
| 20***57 | Pin | 1 |
| 20***20 | Clamp | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Hydraulic Fast Coupling Cylinder
| 20***59 | Cylinder, Assembly | 1 |
| 20***45 | Cylinder | 1 |
| 20***14 | Piston Rod | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Jig Arm
| 31***50 | Fixed Arm | 1 |
| 31***51 | Movable Arm | 1 |
| 31***21 | Pin | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Jig Arm Cylinder
| 20***01 | Piston Rod | 1 |
| 39***04 | Jig Arm Cylinder, Assembly | 1 |
| 39***11 | Cylinder | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Outrigger Cylinder
| 20***01 | Piston Rod | 1 |
| 39***02 | Outrigger Cylinder, Assembly | 2 |
| 39***11 | Cylinder | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Shovel Dumping Cylinder
| 20***62 | Cylinder, Assembly | 1 |
| 20***47 | Cylinder | 1 |
| 20***12 | Piston Rod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Shovel Lifting Cylinder
| 20***53 | Cylinder, Assembly | 2 |
| 20***41 | Cylinder | 1 |
| 20***10 | Piston Rod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Side Digging Boom
| 20***90 | Pin | 1 |
| 20***60 | Pin | 2 |
| 20***28 | Pin | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Side Digging Boom Cylinder
| 20***89 | Cylinder, Assembly | 1 |
| 20***01 | Cylinder | 1 |
| 20***92 | Piston Rod | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment : Teeth Under Blade - Blade Instead Of Teeth
| 35***52 | Blade, L=1900 mm | 1 |
| 35***53 | Blade, L=1900 mm | 1 |
| 36***50 | Blade, L=2000 mm | 1 |
Work Equipment Control System
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Backhoe Control Valve (1/4)
| 84***43 | Control Valve, Assembly | 1 |
| 84***72 | Washer | 1 |
| 84***75 | Cap, Assembly | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Backhoe Control Valve (2/4)
| 80***77 | Screw | 4 |
| 84***76 | Gasket | 2 |
| 84***81 | Kit, Support | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Backhoe Control Valve (3/4)
| 80***77 | Screw | 4 |
| 84***76 | Gasket | 2 |
| 84***81 | Kit, Support | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Backhoe Control Valve (4/4)
| 80***77 | Screw | 2 |
| 84***76 | Gasket | 1 |
| 84***81 | Kit, Support | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Backhoe Control Valve (For Hammer)
| 80***77 | Screw | 4 |
| 84***51 | Control Valve, Assembly | 1 |
| 84***76 | Gasket | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Backhoe Control Valve (For Jig Arm)
| 80***77 | Screw | 2 |
| 84***46 | Control Valve, Assembly | 1 |
| 84***76 | Gasket | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Backhoe Control Valve (For Side Digging Boom)
| 80***77 | Screw | 2 |
| 84***50 | Control Valve, Assembly | 1 |
| 84***43 | Element, Assembly | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydralic Piping (Shovel Tipping Cylinder Line) (Safety Valve)
| 20***50 | Clamp | 1 |
| 20***70 | Clamp | 1 |
| 35***50 | Pipe | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Arm And Bucket Cylinder Line) (For Jig Arm)
| 20***49 | Foot, R.H | 1 |
| 20***56 | Foot, L.H | 1 |
| 31***54 | Pipe | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Arm And Bucket Cylinder Line) (For Side Digging Boom
| 39***34 | Hose | 4 |
| 39***71 | Hose | 2 |
| 50***10 | Union | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Arm Cylinder Line) (Safety Valve)
| 31***61 | Pipe | 1 |
| 31***01 | Support | 1 |
| 31***02 | Union | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Boom Cylinder Line)
| 20***45 | Clamp | 8 |
| 20***55 | Pipe | 1 |
| 20***56 | Pipe | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Boom Cylinder Line) (Safety Valve)
| 31***57 | Pipe | 1 |
| 31***58 | Pipe | 1 |
| 31***59 | Pipe | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Boom Swing Cylinder Line)
| 20***45 | Clamp | 4 |
| 31***01 | Plate | 2 |
| 31***03 | Support | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Bucket 4 In 1 Cylinder Line)
| 20***51 | Coupling, Assembly. (For Hand Hammer) | 2 |
| 20***52 | Fitting (For Hand Hammer) | 1 |
| 20***53 | Body (For Hand Hammer) | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Bucket Cylinder Line)
| 20***50 | Union | 1 |
| 20***51 | Union | 1 |
| 20***53 | Pipe | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Cylinder Line)
| 39***34 | Hose | 2 |
| 50***89 | Plate | 2 |
| 50***90 | Foot | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Delivery And Return Line) (For Backhoe) (2/2)
| 20***69 | Coupling, Assembly | 1 |
| 31***39 | Clamp | 1 |
| 31***59 | Pipe | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Delivery And Return Line) For Backhoe (1/2)
| 20***69 | Coupling, Assembly | 1 |
| 39***21 | Hose | 1 |
| 39***41 | Hose | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Fast Coupling Line)
| 20***51 | Coupling, Assembly. (For Hand Hammer) | 4 |
| 20***52 | Fitting (For Hand Hammer) | 1 |
| 20***53 | Body (For Hand Hammer) | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Hammer Line) (1/2)
| 20***69 | Coupling, Assembly | 1 |
| 20***51 | Clamp | 6 |
| 39***06 | Hose | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Hammer Line) (2/2)
| 20***70 | Plug (Only For Disconnecting Hammer) | 1 |
| 31***00 | Union R.H | 1 |
| 31***01 | Union L.H | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Jig Arm Cylinder Line)
| 31***23 | Foot | 1 |
| 31***01 | Retainer | 1 |
| 39***34 | Hose | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Locking Cylinder Line)
| 20***89 | Cylinder, Assembly | 4 |
| 20***15 | Slide Block | 4 |
| 20***57 | Pipe | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Oil Cooler And Return Line)
| 39***16 | Hose | 1 |
| 39***18 | Hose | 1 |
| 50***25 | Tee | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Optional Work Equipment Cylinder Line)
| 35***65 | Clamp, Assembly | 2 |
| 35***29 | Spacer | 2 |
| 35***50 | Pipe, R.H | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Outrigger Cylinder Line)
| 39***00 | Hose | 4 |
| 50***43 | Union (For Homologation Road) | 4 |
| 50***45 | Union (For Hydraulic Lock) | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Shovel Dumping Cylinder Line)
| 20***89 | Clamp | 1 |
| 20***73 | Pipe | 1 |
| 20***74 | Pipe | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Shovel Lifting Cylinder Line)
| 35***51 | Pipe | 2 |
| 35***52 | Pipe | 2 |
| 39***51 | Hose | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Shovel Lifting Cylinder) (Safety Valve)
| 35***53 | Pipe | 1 |
| 35***54 | Pipe | 2 |
| 35***55 | Pipe | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Side Digging Boom Cylinder Line)
| 39***56 | Hose | 2 |
| 50***10 | Union | 2 |
| 50***43 | Union (For Homologation Road) | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Steering Cylinder Line) (1/3)
| 20***90 | Pressure Take-Up | 1 |
| 39***23 | Hose | 1 |
| 39***54 | Hose | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Steering Cylinder Line) (2/3)
| 39***78 | Hose | 1 |
| 39***72 | Hose | 1 |
| 50***10 | Union | 3 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Steering Cylinder Line) (3/3)
| 20***46 | Pin | 4 |
| 39***75 | Hose | 2 |
| 50***12 | Union | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Suction - Delivery Line) (For Shovel)
| 20***90 | Pressure Take-Up | 1 |
| 39***02 | Hose | 1 |
| 39***36 | Hose | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Travel Motor Line (1/2)
| 36***73 | Support | 1 |
| 36***51 | Pipe | 1 |
| 39***35 | Hose | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Piping (Travel Motor Line (2/2)
| 39***09 | Union | 1 |
| 39***05 | Hose | 1 |
| 39***26 | Hose | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Pump (Travel) (1/3)
| 84***97 | Hydraulic Pump, Assembly | 1 |
| 84***35 | Ring, Snap | 1 |
| 84***10 | Ring, Snap | 2 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Pump (Travel) (2/3)
| 84***40 | O-Ring | 3 |
| 84***30 | Relief Valve (Low Pressure) | 1 |
| 84***96 | O-Ring | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Pump (Travel) (3/3)
| 84***35 | Ring, Snap | 1 |
| 84***69 | O-Ring | 2 |
| 84***08 | O-Ring | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Hydraulic Tank
| 20***40 | Indicator Oil Level | 1 |
| 20***60 | Breather Plug | 1 |
| 36***57 | Cover | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Shovel Control Valve (1/2)
| 80***77 | Screw | 2 |
| 84***32 | Control Valve, Assembly | 1 |
| 84***69 | Tie-Rod, Assembly | 4 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Shovel Control Valve (2/2)
| 80***77 | Screw | 4 |
| 84***76 | Gasket | 2 |
| 84***81 | Kit, Support | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Travel Motor (1/2)
| 80***50 | Ring, Snap | 1 |
| 80***62 | Ring, Snap | 1 |
| 84***83 | Gasket | 1 |
Komatsu : Wb70a-1(S/N F10392-Up) : Work Equipment Control System : Travel Motor (2/2)
| 84***04 | Socket | 2 |
| 84***09 | O-Ring | 1 |
| 84***17 | Coil | 1 |
WB70A-1(S/N F10392-Up) serial number reference
The PIN/serial plate is riveted to the right-hand side of the machine's front section, above the right front fender, with the full number also stamped in large digits just below the plate. On the WB70A-1 the running number is prefixed with a single letter F rather than a 3-letter alpha code; read the digits after the F as the sequential production number, which is what changes at each parts-book breakpoint (F10392, F10950, etc.).
| Prefix | Identifies | Notes |
|---|---|---|
| F10001 | WB70A-1 backhoe loader, earliest documented production/parts-book break | Marks the start of a shop-manual edition for the WB70A-1 predating this job's F10392 break. Documented only through parts-catalog resellers referencing the same manual code, no OEM-direct listing found - confirm with dealer before treating as a distinct configuration change. |
| F10392 | WB70A-1 backhoe loader, this serial break (subject machine) | Covers WB70A-1 units from this point through the next parts-book split at F10950. Same numbering used for both US-market and Italy-market documentation, so it is one production run, not a market-specific variant. Engine fitted is the Komatsu 4D98E, a 4-cylinder diesel built on the Yanmar 4TNE98 block, rated 52 kW (70.8 hp) per factory spec sheet. Model-year data points to a short 2006 production run. |
| F10950 | WB70A-1 backhoe loader, later production/parts-book break | Next sequential parts-catalog split after F10392, explicitly tied to the WB70A-1 in both US-market and Italy-market catalogs. No source documents a mechanical or engine change at this break versus the F10392 range - treat as a running parts-book edition, not a new configuration, unless the dealer confirms otherwise. |
Frequently asked questions
What engine does the Komatsu WB70A-1 (S/N F10392-Up) use?
This serial range runs the Komatsu 4D98E-1FA, a four-cylinder diesel built on the Yanmar 4TNE98 block, rated 52.8 kW (70.8 hp) net at 2,500 rpm under SAE J1349, with 3.3 L displacement. It's mechanically governed with a mechanical injection pump; there is no electronic engine control or fault-code diagnostic system on this serial range.
What is the operating weight of the Komatsu WB70A-1 (S/N F10392-Up)?
Standard operating weight is 5,650 kg (12,456 lb), rising to 6,400 kg (14,110 lb) in a full configuration. The spread reflects cab type (open canopy vs. enclosed), counterweighting, and backhoe or attachment options fitted.
What replaced the Komatsu WB70A-1?
Komatsu did not carry this sub-6.5-tonne WB70 size class forward into its current loader-backhoe range. Today's Komatsu Europe lineup starts at the heavier WB93 class (WB93S/R-5 and later -8 generation machines), so there is no direct same-size factory successor; dealers point WB70A-1 owners toward the WB93 range as the nearest current model, a step up in size and weight.
What WB70A-1(S/N F10392-Up) owners discuss
What do people who've actually run a WB70A-1(S/N F10392-Up) loader-backhoe say about how it drives and works?
Consensus from operators who've compared it against JCB and Cat backhoe loaders in the same size class: it's a decent, unpretentious workhorse for the money. It isn't fussy about fuel quality, the axles hold up well, and build quality is rated above some other budget-tier backhoe loaders of the era. On the downside, several operators describe it as noticeably slower and less powerful than a comparable JCB, and the load-sensing hydraulic and transmission controls shared across the WB70/91/93/97/98 family are called overly complex for a machine this size, which makes troubleshooting harder than it should be.
Where does wear show up first on the backhoe end of the machine?
The same pattern is reported across this class of small-to-mid Komatsu loader-backhoe: the boom foot pin, dipper (arm) pin, and bucket pivot pin wear fastest because they carry constant load reversal and sit in a joint packed with abrasive soil. Extend the boom to full reach and swing it side to side. Felt slack or a banging noise on quick direction changes means the pins and bushings are due for replacement. The bucket pivot is usually the worst offender, especially on machines that spent time on ditch-cleaning or trenching work where the joint sat wet.
Are the outrigger (stabilizer) cylinders a known weak point?
Yes, in the same way stabilizer cylinders are on most loader-backhoes this size. Dirt collects on the rod under the pad and gets dragged into the rod seal on every cycle, which wears the seal and shows up as weeping or a slow leak-down over time. Wipe the rods clean daily and check for pitting; pitted chrome cuts a new seal almost immediately. A leaking or slowly drifting outrigger under load is a stability risk. Have your dealer verify cylinder and seal condition before returning the machine to trench or roadside work.
What about the articulation (center pivot) joint?
Hydraulic hoses and the wiring harness routed across the center articulation joint flex with every steering input, so they age faster than lines elsewhere on the machine. This is a pattern reported across articulated loaders generally, not unique to this model. Plan to inspect and replace hoses at that joint on a shorter cycle than the rest of the machine. Also rock the front and rear frames against each other with the machine stopped to check the center pin and bushing for play; looseness there points to bushing wear, not just a hydraulic leak.
What's the word on the 4D98E engine in this machine?
The WB70A-1(S/N F10392-Up) runs the naturally aspirated Komatsu 4D98E, a mechanically governed diesel closely related to the Yanmar 4TNE98 industrial engine. Community feedback on this engine family is that it's simple and durable if kept clean: no turbo and no electronic injection to fail. The complaints that do come up trace back to fuel quality and injector or lift-pump contamination. A gradual loss of power, harder starting, or increased smoke is usually a dirty fuel system or a tired injection pump rather than the block itself. Regular fuel filter changes and clean fuel are the most repeated advice.
Any recurring electrical or sensor complaints?
Most electrical gripes on the WB70/91/93/97/98 family center on the complexity of the load-sensing hydraulic control wiring rather than the engine harness. Dash warning lights get tied to pressure or flow sensors that are hard to chase without the wiring diagram. On machines this age, expect corroded or intermittent connectors, especially near the backhoe swing frame and the articulation joint where the harness flexes and picks up moisture. A fault light that clears itself after wiggling a connector points to a chafed or corroded pin rather than a failed sensor.
What should I check before buying a used WB70A-1(S/N F10392-Up)?
Cycle the backhoe to full reach and swing it both directions, watching and listening for slack or banging in the boom foot, dipper, and bucket pins. Wipe down and inspect both outrigger cylinder rods for pitting or weeping. Rock the front and rear frames at the articulation joint to check center pin play, and look over the hoses and harness crossing that joint for chafing. Start the engine cold and watch for excess smoke or hard starting, and check the oil for a milky look or metal. This model was never sold in high volume in most markets, so used and even routine service parts can be scarce and pricier than for a same-era Case or JCB; confirm parts and service support with a Komatsu dealer before committing. Have your dealer verify hydraulic pump and stabilizer cylinder condition on a full inspection before purchase, since those are the costliest repairs if deferred.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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