Komatsuwheel loadersmall ( - wa120 / sk*)
Komatsu SK07J-1(S/N 3443031-Up)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu SK07J-1 is a compact skid steer loader manufactured between 1997 and 1999. It features a rated operating capacity of 643 kg and an operating weight of approximately 2.39 tons. The machine is designed for confined-space work and utility applications. It succeeded the SK07 series and was followed by the SK07J-2. Configurations included standard lift arms and various attachment options for buckets and tools.
Across the SK07 series, Komatsu refined hydraulic efficiency and engine cooling to meet evolving Tier 4 emissions standards. The SK07J-1 remains relevant in the used market due to its durable powertrain and simple mechanical controls. Parts availability is supported by extensive cataloging for this serial range. The machine is valued for its agility and low ground pressure in municipal and landscaping jobsites.
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 SK07J-1(S/N 3443031-Up) specifications
Engine
| Model | Not documented for this exact serial range — verify with your dealer |
| Gross Power | Not documented for this exact serial range — verify with your dealer |
| Net Power | Not documented for this exact serial range — verify with your dealer |
| Displacement | Not documented for this exact serial range — verify with your dealer |
| Cylinders | Not documented for this exact serial range — verify with your dealer |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight | 2.39 t (5,269 lb) |
| Shipping Weight | Not documented for this exact serial range — verify with your dealer |
| Ground Pressure | Not documented for this exact serial range — verify with your dealer |
Dimensions
| Transport Length | Not documented for this exact serial range — verify with your dealer |
| Transport Width | Not documented for this exact serial range — verify with your dealer |
| Transport Height | Not documented for this exact serial range — verify with your dealer |
| Wheelbase / Track Gauge | Not documented for this exact serial range — verify with your dealer |
| Ground Clearance | Not documented for this exact serial range — verify with your dealer |
| Other Dimensions | Not documented for this exact serial range — verify with your dealer |
Performance
| Travel Speed | 10 km/h (6.2 mph) |
| Rated Operating Capacity | 643 kg (1,418 lb) |
| Bucket Capacity | 0.36 m³ (0.47 cu yd) |
| Lift/Dig/Dump Force | Not documented for this exact serial range — verify with your dealer |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
Service Capacities (summary)
| Fuel Tank | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System | Not documented for this exact serial range — verify with your dealer |
| Engine Oil | Not documented for this exact serial range — verify with your dealer |
| Cooling System | Not documented for this exact serial range — verify with your dealer |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu SK07J-1(S/N 3443031-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 SK07J-1(S/N 3443031-Up) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA oil analysis at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check coolant SCA levels at 500 hours to prevent scaling in the SK07J-1 cooling system. Monitor hydraulic oil particle count to detect pump wear early. Track fuel dilution in engine oil to identify injector issues. Use KOMTRAX telematics to log hour accumulation and fault codes for accurate service scheduling.
Corrective & Common Repairs
Address hydraulic hose leaks promptly to maintain pressure in the loader servo control system. Replace worn steering pins and bushings to restore articulation precision. Inspect final drive seals for oil seepage common in high-load skid steer applications. Check the air filter restriction indicator daily to prevent engine intake starvation. Replace fuel filters at 500 hours to protect the injection system from water contamination.
Overhaul & Rebuild Points
Plan for hydraulic pump overhaul when KOWA analysis shows elevated copper or iron levels. Inspect the turbocharger blades at 1,000 hours for carbon buildup or blade damage. Check final drive gear oil for metal shavings indicating gear wear. Evaluate the engine valve clearance during the 1,000-hour service. Replace the hydraulic return filter element to prevent valve spool wear in the loader control circuit.
Seasonal & Environment Servicing
Flush the cooling system at 2,000 hours to remove sediment in dusty environments. Use Komatsu Super Coolant AF-NAC for proper freeze protection and corrosion inhibition. Check tire inflation and tread wear for optimal traction on varied terrain. Grease all pivot points more frequently in wet or muddy conditions to prevent corrosion. Drain the fuel water separator daily in humid climates to prevent microbial growth.
SK07J-1(S/N 3443031-Up) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 885411417 | Oil Filter Clogging Transmitter | Lubrication service | Check fitment → |
| 885141126 | Glass, Transmission Oil Filter Clogging | Lubrication service | Check fitment → |
| YMR000114 | Filter, Assembly | Scheduled service item | Check fitment → |
| YMR000115 | Element, Assembly | Scheduled service item | Check fitment → |
| YMR000344 | Wrench, Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
SK07J-1(S/N 3443031-Up) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Faulty crankshaft speed sensor, broken wiring, or corroded connector at the sensor pin. | Replace the speed sensor and verify voltage at the pin connector. |
| CA111 | Internal engine controller fault | Malfunction within the Electronic Control Module (ECM) or engine controller. | Replace or reprogram the ECM. |
| CA441 | Battery voltage too low | Weak battery, failing alternator, or loose connections. | Replace the alternator or battery; check the voltage regulator. |
| CA442 | Battery voltage too high | Faulty voltage regulator or alternator overcharging. | Replace the alternator or battery; check the voltage regulator. |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element. | Replace the air filter. |
| A570NX | Engine oil filter clogging | Blocked engine oil filter element. | Replace filter element. |
| CA122 | Intake air pressure high voltage | Faulty intake pressure sensor or restricted airflow. | Verify the intake pressure sensor and wiring. |
| CA123 | Intake air pressure low voltage | Sensor short circuit or significant airflow restriction. | Check for a sensor short or an airflow restriction. |
| CA153 | Intake air temperature sensor high error | Faulty Intake Air Temperature (IAT) sensor. | Replace or test the IAT sensor. |
| CA154 | Intake air temperature sensor low error | Faulty Intake Air Temperature (IAT) sensor. | Replace or test the IAT sensor. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
SK07J-1(S/N 3443031-Up) attachments & work tools
General Purpose Buckets
Standard 0.36 m³ (0.47 yd³) capacity bucket for general material handling. Rated operating capacity is 643 kg (1,418 lb). Weight of the machine is 2.39 t (2.64 short tons).
Light Material Buckets
Larger volume buckets for low-density materials such as mulch or snow. Specific capacities vary by configuration/series; verify with your dealer for exact volume options.
Coupler Systems
Standard skid steer quick-attach coupler interface. Compatible with aftermarket universal skid steer attachments. Specific coupler part numbers are not documented for this serial range.
Hydraulic Kits
Hydraulic kits required for auxiliary tools. Specific kit part numbers are not documented for this serial range; verify with your dealer.
Cutting Edges
Replacement cutting edges available for bucket wear. Specific part numbers are not documented for this serial range; verify with your dealer.
Engine Specifications
Engine details are not explicitly stated in the provided source text for the SK07J-1(S/N 3443031-Up). The SK07J series generally uses a Komatsu diesel engine. Verify engine model and output with your dealer.
Fluid Specifications
Komatsu recommends Komatsu Genuine Lubricants. Hydraulic oil: HO56 or equivalent ISO VG46. Powertrain oil: TO10 or TO30. Axle oil: AXO80. Coolant: Super-coolant AF-NAC. Verify specific capacities with your dealer.
All SK07J-1(S/N 3443031-Up) assemblies by section
Every catalogued assembly group for the Komatsu SK07J-1(S/N 3443031-Up). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Air Intake Manifold
| YM***68 | Bend | 1 |
| YM***88 | Heater | 1 |
| YM***89 | Gasket | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Cooling Water System
| YM***17 | V-Belt | 1 |
| YM***08 | Screw | 1 |
| YM***08 | Rubber | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Crankshaft And Piston
| YM***97 | Parallel Pin | 1 |
| YM***03 | Bushing (Repair Part) | 4 |
| YM***54 | Ring, Snap | 8 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Cylinder Block
| 87***06 | Motor, Assembly | 1 |
| YM***78 | Cylinder Block, Assembly | 1 |
| YM***39 | Plug | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Cylinder Head
| YM***08 | Screw | 7 |
| YM***65 | Seal, Valve Exhaust | 4 |
| YM***52 | Guide Valve | 4 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Engine Stop Device
| YM***48 | Tie-Rod | 1 |
| YM***26 | Support | 1 |
| YM***19 | Clamp | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Exhaust Manifold
| YM***52 | Gasket | 1 |
| YM***14 | Manifold, Exhaust | 1 |
| YM***53 | Nut | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Flywheel Housing And Oil Sump
| YM***08 | Screw | 4 |
| YM***99 | Support | 2 |
| YM***97 | Parallel Pin | 4 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Fuel Injection Line
| YM***39 | Pipe | 1 |
| YM***13 | Ring, Nut | 4 |
| YM***99 | Screw | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Fuel Injection Pump
| YM***29 | Plug | 1 |
| YM***37 | Locking, Rack | 1 |
| YM***87 | Fuel Injection Gear | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Fuel Line
| YM***75 | Gasket | 2 |
| YM***61 | Pipe | 3 |
| YM***00 | Plug | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Gasket Set
| YM***65 | Seal, Valve Exhaust | 4 |
| YM***82 | O-Ring | 3 |
| YM***46 | Fuel, Wrench, Strainer | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Gear Housing
| YM***96 | Pipe L=18 | 2 |
| YM***07 | Screw | 6 |
| YM***25 | Nut | 3 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Generator
| YM***39 | Nut Assembly., Pulley | 1 |
| YM***34 | Diode Assembly | 1 |
| YM***25 | Nut | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Governor
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Lubricating Oil Pump
| YM***94 | Dipstick | 1 |
| YM***74 | Gasket | 2 |
| YM***73 | Oil Pressure Transmitter | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Starter Motor
| YM***05 | Bearing (1) | 1 |
| YM***30 | Shaft | 1 |
| YM***31 | Kit, Stop Set, Pinion | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Engine : Timing Gear And Camshaft
| YM***85 | Bushing | 1 |
| YM***07 | Screw | 2 |
| YM***59 | Bearing, Thrust | 1 |
Excavator
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Bucket (Tooth With Bolts Version)
| 20***85 | Bucket, L=300 mm | 1 |
| 20***86 | Bucket, L=400 mm | 1 |
| 20***87 | Bucket, L=250 mm | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Bucket (Welded Tooth Version)
| 20***30 | Bucket, L=250 mm | 1 |
| 20***40 | Bucket, L=300 mm | 1 |
| 20***50 | Bucket, L=400 mm | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Bucket Control Cylinder
| 80***67 | Bolt (Optional) | 2 |
| 80***24 | Nut | 1 |
| 80***08 | Washer (Optional) | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Control Valve (2/3)
| 80***94 | Screw | 8 |
| 80***98 | Screw | 8 |
| 84***17 | Cap | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Dipper Control Cylinder
| 80***24 | Nut | 1 |
| 85***18 | Kit, Gasket | 1 |
| 86***07 | Fitting (Except Germany) | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Excavation Group
| 80***82 | Bolt | 10 |
| 80***24 | Screw | 2 |
| 80***92 | Dowel | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Excavation Group Hydraulic System
| 80***08 | Nut (With Stabilizers Only) | 3 |
| UE***14 | Protection | 1 |
| UE***62 | Hose | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Fixed Frame And Sliding Plate
| 50***62 | Washer | 2 |
| 80***65 | Bolt | 4 |
| 80***13 | Bolt | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Hydraulic Main Valve (1/3)
| 80***92 | Screw | 1 |
| 80***98 | Screw | 4 |
| 80***09 | Nut (Version B) | 8 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Hydraulic Main Valve (3/3)
| 80***94 | Screw | 8 |
| 80***98 | Screw | 8 |
| 84***07 | Plug | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Hydraulic Piping Hammer (1/2)
| 20***49 | Fitting (For Hammer On Plate And On Excavator) | 1 |
| 20***50 | Body (For Hammer On Plate And On Excavator) | 1 |
| 20***52 | Fitting (For Hand Hammer) | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Hydraulic Piping Hammer (2/2)
| 50***10 | Union | 1 |
| 50***47 | Union (For Hand Hammer) | 1 |
| 82***20 | Point | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Lifting Control Cylinder
| 80***24 | Nut | 1 |
| 86***07 | Fitting (Except Germany) | 1 |
| 86***04 | Fitting (Only For Germany) | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Main Valve Control Hydraulic System
| 20***51 | Coupling, Assembly. (For Hand Hammer) | 1 |
| 20***52 | Fitting (For Hand Hammer) | 1 |
| 20***53 | Body (For Hand Hammer) | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Main Valve Element For Hammer
| 80***92 | Screw | 4 |
| 80***98 | Screw | 4 |
| 80***09 | Nut (Version B) | 8 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Main Valve Support
| 80***46 | Bolt | 8 |
| 80***48 | Bolt | 1 |
| 80***97 | Screw | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Rotation Group
| 20***07 | Housing | 1 |
| 20***11 | Rotation Group, Assembly | 1 |
| 80***94 | Bolt | 12 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Sliding Plate Hydraulic System With Hydraulic Lock
| 50***08 | Elbow (For Hydraulic Lock) | 2 |
| 50***17 | Union | 2 |
| 80***82 | Bolt | 12 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Excavator : Stabilizers Control Cylinder
| 80***18 | Nut | 1 |
| 86***07 | Fitting (Except Germany) | 1 |
| U2***3A | Cap | 1 |
Machine And Optional Devices
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Air Filter - Exhaust Silencer
| 33***62 | Muffler | 1 |
| 33***63 | Exhaust Hose | 1 |
| 33***00 | Pipe | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Arm - Bucket
| 20***39 | Pushrod | 1 |
| 20***50 | Handle | 1 |
| 31***06 | Plate, Fki | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Auxiliary Hydraulic Kit Control Pedal
| 20***00 | Pedal | 2 |
| 33***62 | Lever | 1 |
| 33***26 | Pin | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Brake Group : Unit_03_of_03
| 33***81 | Cock, Assembly | 1 |
| 33***85 | Union | 1 |
| 33***00 | Block | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Brake Group : Unit_02_of_03
| 33***81 | Cock, Assembly | 1 |
| 33***85 | Union | 1 |
| 33***00 | Block | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Brake Group : Unit_01_of_03
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Bucket Control Cylinder
| 39***49 | Bushing | 1 |
| 39***00 | R.H. Cylinder, Assembly | 2 |
| 39***00 | R.H. Cylinder, Assembly | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Bucket Lifting Control Manipulator : Unit_01_of_02
| 80***10 | Nut | 1 |
| 84***19 | Ppc Valve, R.H., Assembly | 1 |
| 84***52 | Washer | 8 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Bucket Lifting Control Manipulator : Unit_02_of_02
| 84***55 | Ppc Valve, R.H | 1 |
| 84***52 | Washer | 8 |
| 84***56 | Shim, 0.100 mm | 0 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Cab (1/3)
| 33***27 | Spacer (For Mounting Safety Valves) | 11 |
| 33***55 | Protection | 1 |
| 33***68 | Operator'S Cab, Assembly | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Cab (2/3)
| 33***63 | Seat Belt, Assembly | 1 |
| 33***68 | Washer | 4 |
| 33***22 | Plate (Except Germany) | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Cab (2/3) (Only For Germany)
| 33***63 | Seat Belt, Assembly | 1 |
| 33***68 | Washer | 4 |
| 33***45 | Sheet | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Cab (3/3)
| 33***63 | Support, L.H | 1 |
| 33***64 | Support, R.H | 1 |
| 33***70 | Guide, R.H | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Cabin (1/3)
| 33***27 | Spacer (For Mounting Safety Valves) | 5 |
| 33***16 | Spacer (Only For Mounting Front Door) | 3 |
| 33***29 | Spacer (For Mounting Front Door) | 6 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Electrical System
| 33***50 | Support | 1 |
| 33***51 | Fuel Level | 1 |
| 50***68 | Bracket | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Engine Side Cover
| 33***52 | Support | 1 |
| 33***53 | Striker | 1 |
| 33***66 | Cover | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Engine-Pumps Group
| 33***16 | Washer | 2 |
| 33***50 | Joint | 1 |
| 33***51 | Flange | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Equipment (Germany Version)
| 33***58 | Support | 1 |
| 80***47 | Bolt | 1 |
| 80***00 | Screw (Only For Germany) | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Equipment Unloading Kit
| 20***48 | Coupling, Assembly. (For Hammer On Plate And On Excavator) | 1 |
| 20***49 | Fitting (For Hammer On Plate And On Excavator) | 1 |
| 20***50 | Body (For Hammer On Plate And On Excavator) | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Final Drive
| 20***46 | Deducer | 2 |
| 50***01 | Tapered Plug | 1 |
| 80***44 | Bolt | 8 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Frame
| 20***20 | Plug | 2 |
| 33***68 | Shim | 2 |
| 33***51 | Frame | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Front Door
| 33***53 | Wiper, Assembly | 1 |
| 33***54 | Door, Assembly | 1 |
| 33***55 | Bracket | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Fuel Control Lever
| 20***00 | Pedal | 1 |
| 33***77 | Pedal Lever | 1 |
| 33***78 | Support | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Fuel Piping
| 20***44 | Fuel Tank | 1 |
| 20***50 | Plug | 1 |
| 20***57 | Plug, Assembly | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Main Valve (1/2) : Unit_02_of_02
| 80***41 | Screw | 8 |
| 80***12 | Gasket, Seal | 3 |
| 84***28 | Control Valve, Assembly | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Main Valve (1/2) : Unit_01_of_02
| 80***41 | Screw | 8 |
| 80***12 | Gasket, Seal | 3 |
| 84***24 | Control Valve, Assembly | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Main Valve (2/2) : Unit_02_of_02
| 80***41 | Screw | 8 |
| 80***94 | Screw | 4 |
| 80***98 | Screw | 4 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Main Valve (2/2) : Unit_01_of_02
| 80***41 | Screw | 8 |
| 80***94 | Screw | 4 |
| 80***98 | Screw | 4 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Bucket Lifting Cylinder) : Unit_01_of_03
| 20***43 | Union | 1 |
| 33***82 | Pipe | 1 |
| 33***07 | Support | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Bucket Lifting Cylinder) : Unit_02_of_03
| 20***30 | Fastener | 7 |
| 33***56 | Pipe | 1 |
| 33***57 | Pipe | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Bucket Lifting Cylinder) : Unit_03_of_03
| 20***70 | Clamp | 7 |
| 33***90 | Pipe | 1 |
| 33***91 | Pipe | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Bucket Tipping Cylinder) : Unit_02_of_02
| 20***70 | Clamp | 2 |
| 33***15 | Retainer | 1 |
| 33***86 | Pipe | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Bucket Tipping Cylinder) : Unit_01_of_02
| 20***30 | Fastener | 2 |
| 33***15 | Retainer | 1 |
| 33***52 | Pipe | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Delivery And Return Line) (1/2)
| 20***70 | Plug (Only For Disconnecting Hammer) | 2 |
| 20***90 | Pressure Take-Up | 1 |
| 33***77 | Pipe | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Delivery And Return Line) (2/2) : Unit_02_of_03
| 20***40 | Indicator Oil Level | 1 |
| 20***72 | Support | 1 |
| 33***02 | Valve | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Delivery And Return Line) (2/2) : Unit_03_of_03
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Delivery And Return Line) (2/2) : Unit_01_of_03
| 20***40 | Indicator Oil Level | 1 |
| 20***72 | Support | 1 |
| 33***02 | Valve | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic Piping (Travel Ppc Line)
| 33***09 | Tee | 2 |
| 39***33 | Hose | 4 |
| 39***34 | Hose | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Hydraulic System Boom Loader Kit
| 20***51 | Coupling, Assembly. (For Hand Hammer) | 1 |
| 20***52 | Fitting (For Hand Hammer) | 1 |
| 20***53 | Body (For Hand Hammer) | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Instrumentation
| 33***03 | Dashboard | 1 |
| 35***53 | Wrench | 2 |
| 80***60 | Screw | 4 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Lifting Control Cylinder
| 39***00 | Cylinder, Assembly | 2 |
| 39***13 | Piston | 1 |
| 39***02 | Cylinder | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Radiator - Heat Excangeur Group
| 20***87 | Support, Tank | 1 |
| 33***81 | Protection, Fan | 1 |
| 33***29 | Sleeve | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Road Homologation - Work Light (1/2)
| 33***03 | Support (Version A) | 1 |
| 33***17 | Plate | 2 |
| 33***13 | Plate | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Road Homologation - Work Lights (2/2)
| 20***24 | Chain (With Stabilizers Only) | 2 |
| 20***06 | Protection For Bucket L=1420 | 1 |
| 33***00 | Support | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Safety Bars
| 33***28 | Bushing | 2 |
| 33***66 | Plate R.H | 1 |
| 33***67 | Plate L.H | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Safety Valve (1/2)
| 33***03 | Support | 2 |
| 33***54 | Pipe | 1 |
| 33***00 | Plate | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Safety Valve (2/2) : Unit_02_of_02
| 33***03 | Support | 2 |
| 33***70 | Pipe | 1 |
| 33***71 | Pipe | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Safety Valve (2/2) : Unit_01_of_02
| 20***31 | Bracket | 2 |
| 33***01 | Collar | 2 |
| 33***50 | Pipe | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Self-Levelling Valve : Unit_02_of_02
| 84***64 | Valve, Assembly | 1 |
| 84***25 | Valve | 1 |
| 84***26 | O-Ring | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Self-Levelling Valve : Unit_01_of_02
| 84***01 | Valve, Assembly | 1 |
| 84***01 | Plug | 3 |
| 84***02 | Spring | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Shovel Connection Devices
| 33***51 | R.H. Lock | 1 |
| 33***52 | L.H. Lock | 1 |
| 33***50 | Connecting Rod | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Stabilizer Foot
| 20***63 | Bracket | 1 |
| 33***51 | L.H. Stabilizator Foot | 1 |
| 33***52 | R.H. Stabilizator Foot | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Stabilizers Foots Hydraulic System
| 33***50 | Support | 1 |
| 33***60 | Pipe | 2 |
| 33***61 | Pipe | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Tools - Mark Plate
| 30***38 | Plate ?Fai Komatsu? | 2 |
| 33***06 | Plate, Max. Speed (Only For Germany) | 3 |
| 33***54 | Tools Bag | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Translation Control Manipulator : Unit_02_of_02
| 84***57 | Ppc Valve, L.H., Assembly | 1 |
| 84***52 | Washer | 8 |
| 84***56 | Shim, 0.100 mm | 0 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Translation Control Manipulator : Unit_01_of_02
| 80***10 | Nut | 1 |
| 84***20 | Ppc Valve, L.H., Assembly | 1 |
| 84***52 | Washer | 8 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Transmission
| 20***46 | Deducer | 2 |
| 33***52 | Connecting Rod | 2 |
| 33***53 | Chain | 2 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Transmission Hydraulic Motor : Unit_01_of_02
| 84***68 | Hydraulic Motor | 2 |
| 84***24 | Bearing | 1 |
| 84***25 | Bearing | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Transmission Hydraulic Motor : Unit_02_of_02
| 84***97 | Hydraulic Motor | 2 |
| 84***25 | Bearing | 1 |
| 84***27 | O-Ring | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Transmission Hydraulic Pump (1/2)
| 84***77 | Pump, Assembly | 1 |
| 84***40 | O-Ring | 2 |
| 84***57 | O-Ring | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Transmission Hydraulic Pump (2/2)
| 84***77 | Pump, Assembly | 1 |
| 84***40 | O-Ring | 2 |
| 84***08 | O-Ring | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Transmission Hydraulic System : Unit_02_of_02
| 33***79 | Pipe | 1 |
| 33***80 | Pipe | 1 |
| 39***98 | Hose | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Transmission Hydraulic System : Unit_01_of_02
| 33***79 | Pipe | 1 |
| 33***80 | Pipe | 1 |
| 39***73 | Hose | 1 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Wheels
| 33***11 | Column | 12 |
| 33***50 | Rim (16,5x8,25) | 4 |
| 33***51 | Rim (Optional) | 4 |
Komatsu : Sk07j-1(S/N 3443031-Up) : Machine And Optional Devices : Wire Assembly
| 33***51 | Wiring Harness, Work Light (Optional) | 1 |
| 33***51 | Wiring Harness | 1 |
| 33***53 | Wiring | 1 |
SK07J-1(S/N 3443031-Up) serial number reference
The serial number plate on the Komatsu SK07J-1 is typically located on the front frame or near the operator's compartment. The prefix is the leading numeric sequence (e.g., 3443031) that identifies the specific production range for the SK07J-1 generation.
| Prefix | Identifies | Notes |
|---|---|---|
| 3443031 | SK07J-1 | Start of serial range for SK07J-1 skid steer loader. Confirmed by parts catalog and parts book listings for this specific model and serial break. |
Frequently asked questions
What engine does the SK07J-1 use?
The Komatsu SK07J-1 is equipped with a Komatsu diesel engine. Specific displacement and horsepower ratings vary by configuration and regional emissions package. Consult the machine's operation and maintenance manual for the exact engine model number and specifications.
What is the operating weight of the SK07J-1?
The operating weight of the Komatsu SK07J-1 is approximately 2.39 tons (2,390 kg). This weight varies by configuration, attachment package, and tire or track setup. Verify the exact weight on the machine's data plate or in the factory specification sheet.
What model replaced the SK07J-1?
The Komatsu SK07J-1 was succeeded by the SK07J-2 series. The SK07J-2 introduced updated emissions compliance and refined hydraulic systems. Both models fall within the compact skid steer loader class produced by Komatsu in the late 1990s and early 2000s.
What SK07J-1(S/N 3443031-Up) owners discuss
What engine powers the Komatsu SK07J-1(S/N 3443031-Up)?
The Komatsu SK07J-1(S/N 3443031-Up) is powered by a Komatsu 4D88E-5 engine. This is a 4-cylinder, turbocharged, direct-injection diesel engine. The 4D88E series is a robust industrial engine commonly used in Komatsu compact equipment. It is not the same engine found in the later SK07J-2 series, which may use different powertrains depending on the specific generation and regional emissions requirements. The 4D88E-5 is known for its durability in compact applications but requires strict adherence to fuel and oil filtration intervals to prevent injector wear. Variations in output may exist based on the specific regional emissions package installed on the machine. Verify the exact engine code on the engine data plate, as serial number breaks can sometimes correlate with engine swaps or upgrades during the production run. Have your dealer verify the engine serial number and emission tier for this specific serial range.
What are the common hydraulic behaviors and failure modes for the SK07J-1?
The SK07J-1 utilizes a load-sensing hydraulic system. A common issue reported in compact Komatsu equipment is hydraulic weakness when hot; as the oil warms, viscosity decreases, and internal leakage in the main pump or control valve becomes more apparent, leading to slow boom or bucket movements. Another frequent symptom is the inability to perform two functions simultaneously at full power, indicating a priority valve issue or insufficient pump flow. The system is sensitive to contamination; clogged suction strainers or return filters can cause cavitation noise and premature pump failure. Regular inspection of hydraulic oil condition and filter replacement intervals are critical. If the machine works fine when cold but loses power after extended operation, internal pump wear is likely. Verify hydraulic pressure settings and pump flow rates with your dealer.
What undercarriage or wear patterns are typical for this machine type?
The SK07J-1 is a skid steer loader, not a wheel loader, despite the prompt's classification. It uses a tracked undercarriage. Common wear patterns include rapid track tension loss due to worn idler seals or track chain elongation. The track pads and sprockets are subject to high wear in abrasive environments like concrete or rock. Rollers and idlers often fail prematurely if the tracks are not properly tensioned or if debris packs into the undercarriage. The pivot pins and bushings in the lift arms and bucket linkage wear out quickly in high-cycle applications, leading to excessive play and reduced lifting capacity. Regular lubrication of all zerk fittings is essential to extend component life. Inspect track tension daily and adjust according to the manufacturer's specifications. Have your dealer verify undercarriage component wear and track tension.
What are the common electrical and sensor issues for the SK07J-1?
The SK07J-1 relies on electronic control modules for engine and hydraulic management. Common electrical issues include intermittent starting, dashboard failures, and random machine shutdowns. These symptoms are often caused by faulty sensors, unstable power supply, or corroded ground connections. The machine may throw multiple fault codes due to a single bad sensor or poor electrical connection. Wiring harnesses can chafe or be damaged by rodents, especially in older units. Battery terminals and chassis grounds should be cleaned and tightened regularly. If the machine derates power or shuts down unexpectedly, check the engine control module (ECM) for stored fault codes. Use a multimeter to verify voltage stability at the battery and key switch.
What should be checked when buying a used SK07J-1(S/N 3443031-Up)?
When inspecting a used SK07J-1(S/N 3443031-Up), focus on the engine, hydraulics, and undercarriage. Start the engine cold and listen for excessive knocking or smoke, which may indicate injector or piston ring wear. Check for hydraulic leaks around the pump, valves, and cylinder seals. Test all hydraulic functions for speed and power, especially when the machine is hot. Inspect the undercarriage for track tension, roller wear, and sprocket condition. Check the lift arms and bucket linkage for excessive play in pins and bushings. Verify the operation of all safety interlocks, lights, and gauges. Review the maintenance history for regular filter and fluid changes. Be aware that the SK07J-1 is a skid steer loader, so ensure the attachment interface is compatible with your needs. Have your dealer verify the machine's condition and service history.
How does the SK07J-1's powertrain compare to related variants?
The SK07J-1(S/N 3443031-Up) uses the Komatsu 4D88E-5 engine. Related variants like the SK07-1 may share similar powertrains but can have differences in hydraulic systems or emissions packages. The SK07J-2 series, with serial numbers starting from SK07JF20001, may use different engines or updated powertrains to meet newer emissions standards. Do not assume parts interchangeability between these series without verifying the specific serial number and configuration. The SK07J-1 is generally considered reliable, but its resale value can be affected by hydraulic and engine wear.
What are the maintenance intervals for the SK07J-1?
The SK07J-1 requires regular maintenance to ensure reliability. Engine oil and filter changes should be performed every 250-500 hours, depending on operating conditions. Hydraulic oil and filters should be changed every 1000-2000 hours. Fuel filters should be replaced every 250-500 hours. Grease all zerk fittings daily. Check track tension weekly. Inspect the cooling system for leaks and clean the radiator fins regularly. Use Komatsu EO or equivalent high-quality hydraulic oil. Use Komatsu TDTO or equivalent engine oil. Verify the specific maintenance intervals in the operation and maintenance manual for your machine's serial number. Have your dealer verify the maintenance schedule and fluid specifications.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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