Komatsuhydraulic excavatorsmall ( - pc90)
Komatsu PC20MR-1-K(S/N 10001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu PC20MR-1-K is a compact-radius mini excavator designed for utility and confined-space applications. It belongs to the first generation of the PC20MR series, succeeding the original PC20MR and preceding the PC20MR-2. Production for this specific serial range (10001-UP) occurred during the early 2000s. The machine features a tight tail swing design, allowing it to operate safely near obstacles without the counterweight overhanging the tracks. It is available in canopy and cab configurations, with operating weights typically ranging from approximately 2,140 kg to 2,610 kg depending on the attachment package and undercarriage width. The PC20MR-1-K is engineered for precise digging in residential, municipal, and landscaping projects where access is limited.
The PC20MR-1-K represents a critical era in Komatsu's mini excavator lineage, bridging the gap between early compact models and the more advanced, emissions-compliant generations that followed. Its significance in the used and parts market lies in its widespread adoption in the utility sector and the availability of robust aftermarket support for its simple, durable mechanical systems. As these machines age, the market focuses on reliable undercarriage components, hydraulic pumps, and engine rebuild kits. Understanding the specific maintenance intervals and common failure points of the PC20MR-1-K is essential for buyers and operators to maximize uptime and manage repair costs effectively.
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 PC20MR-1-K(S/N 10001-UP) specifications
Engine
| Model | Komatsu 3D84-1A |
| Gross Power | 21.3 hp (15.9 kW) |
| Displacement | 86.2 cu in (1.4 L) |
| Cylinders | 3 |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight | 6,170 lb (2,798.7 kg) |
| Ground Pressure | 4.3 psi (29.6 kPa) |
| Transport Weight | Not documented for this exact serial range — verify with your dealer |
Dimensions
| Transport Length | 14.4 ft in (4,400 mm) |
| Transport Width | 4.8 ft in (1,470 mm) |
| Transport Height | 7.7 ft in (2,335 mm) |
| Tail Swing Radius | 4.5 ft in (1,380 mm) |
| Track Shoe Width | 11.8 in (300 mm) |
| Ground Clearance | 1 ft in (305 mm) |
| Undercarriage Length (Track on Ground) | 5.2 ft in (1,575 mm) |
Performance
| Max Dig Depth | 8.1 ft in (2,455 mm) |
| Max Reach at Ground | 14.3 ft in (4,345 mm) |
| Max Dump Height | 7.7 ft in (2,345 mm) |
| Max Cutting Height | 11.4 ft in (3,485 mm) |
| Swing Speed | 12.5 rpm |
| Travel Speed | 1.1 mph (1.7 km/h) |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
| Drawbar Pull | Not documented for this exact serial range — verify with your dealer |
Forces
| Bucket Digging Force | Not documented for this exact serial range — verify with your dealer |
| Stick/Arm Digging Force | Not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Fuel Tank | 10.6 gal (40 L) |
| Hydraulic System/Tank | 17.2 gal (65 L) |
| 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 PC20MR-1-K(S/N 10001-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 PC20MR-1-K(S/N 10001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu Oil Wear Analysis (KOWA) at every 500-hour interval to monitor engine and hydraulic system health. Check coolant SCA levels regularly to prevent scaling and corrosion in the PC20MR-1-K's cooling passages. Monitor hydraulic oil viscosity and particle count to detect pump wear early. Inspect the air filter restriction indicator daily; clogged filters reduce engine performance and increase fuel consumption. Track undercarriage wear measurements at 500-hour intervals to predict track and sprocket replacement needs before catastrophic failure occurs.
Corrective & Common Repairs
Address hydraulic hose leaks promptly, as high-pressure lines in the PC20MR-1-K are prone to abrasion against the boom and stick. Replace the fuel filter and drain the water separator if water contamination is suspected, which can damage the injection pump. Inspect the swing bearing for play or unusual noise, indicating potential gear wear. Check the final drive oil for metal particles, which signal internal gear or bearing failure. Ensure the track tension is adjusted correctly to prevent excessive wear on rollers and idlers.
Overhaul & Rebuild Points
Plan for major component overhaul around the 10,000-hour mark, including hydraulic pump and cylinder seal replacement. Inspect the engine valve clearance and adjust as necessary to maintain compression and power output. Check the turbocharger for shaft play and housing damage. Evaluate the swing motor and travel motor for internal wear, replacing seals and gears as needed. Inspect the boom and stick welds for cracks, especially in high-stress areas, and repair or reinforce as required to maintain structural integrity.
Seasonal & Environment Servicing
In cold weather, use appropriate grade engine oil and hydraulic fluid to ensure proper flow and lubrication. Check the battery fluid levels and charge state, as cold temperatures reduce battery capacity. Inspect the cooling system for leaks and ensure the radiator fins are clear of debris to prevent overheating in hot conditions. Use biodegradable hydraulic oil if operating in environmentally sensitive areas, as specified in the lubricant specifications. Store the machine indoors or cover exposed components to protect against moisture and dust accumulation.
PC20MR-1-K(S/N 10001-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| YM171051-92760 | Wrench,Fuel Filter? Water Separator | Fuel system service | Check fitment → |
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 20T-98-72410 | Plate? Caution,Engine Fuel Filter | Fuel system service | Check fitment → |
| 21U-60-32210 | Element,Hydraulic Oil | Hydraulic service | Check fitment → |
| YM119332-92751 | Wrench,(For Engine Oil Filter) | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
PC20MR-1-K(S/N 10001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E10 | Engine controller power failure | ECM power connections, fuses, or ground wires are faulty | Inspect ECM power connections, fuses, and ground wires |
| E11 | Engine protection—output power reduced | Coolant temperature, oil pressure, or air filter issues | Check coolant temperature, oil pressure, and air filter |
| CA115 | Engine crankshaft speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify voltage at the pin connector |
| CA441 | Battery voltage too low | Alternator or battery failure; voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator or battery failure; voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| AA10NX | Air cleaner clogging | Clogged air filter element | Replace the air filter |
| AB00KE | Charging voltage low | Alternator malfunction or loose belt | Replace the alternator or tighten the belt |
| B@BCNS | Engine coolant overheating | Radiator fins blocked, fan belt issue, or low coolant level | Check radiator fins, fan belt, and coolant level |
| B@HANS | Hydraulic oil overheating | Contaminated hydraulic oil, clogged filter, or cooler fan issue | Change hydraulic filter and oil; check cooler fan |
| A570NX | Engine oil filter clogging | Clogged engine oil filter element | Replace filter element |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
PC20MR-1-K(S/N 10001-UP) attachments & work tools
Buckets
The Komatsu PC20MR-1-K is a 2-ton class mini-excavator. Standard digging buckets for this weight class typically range from 12 to 18 inches (305 to 457 mm) in width. Rock buckets are generally narrower to maximize penetration, while ditching buckets are wider for grading. Pin-on mounting is standard for this size; quick couplers are available as aftermarket add-ons but are not factory-installed on the base machine.
Hydraulic hammers
This machine falls into the 2-ton (approx. 2.8 metric ton) operating weight class. Compatible hydraulic breakers typically weigh between 150 and 350 lbs (68 to 159 kg). The PC20MR-1-K uses a Komatsu 3D84-1A engine with a hydraulic pump flow capacity of 20.6 gal/min (78 L/min). This flow rate supports medium-class breakers; high-flow kits are not standard and would require dealer verification for specific tool compatibility.
Quick couplers
The PC20MR-1-K does not come with a factory-installed quick coupler. Aftermarket mechanical or hydraulic quick couplers are available for this class, typically using a pin-on interface. Compatibility depends on the specific stick width and pin diameter, which vary by configuration. Users must verify the stick dimensions against the coupler manufacturer's chart for the PC20MR-1-K.
Thumbs/grapples
Mechanical and hydraulic thumbs are available for the PC20MR-1-K. Thumb selection is based on the stick width and pin spacing. Hydraulic thumbs require an auxiliary hydraulic circuit, which may not be standard on all PC20MR-1-K units. Grapples are less common for this size class but can be mounted if the machine's hydraulic flow and pressure ratings support the tool's requirements.
Rippers
Single or multi-shank rippers are available for the PC20MR-1-K. These attachments are used for breaking hard ground or rock. The ripper's weight and hydraulic requirements must be within the machine's lifting capacity and hydraulic system limits. Compatibility is determined by the stick geometry and pin configuration of the specific PC20MR-1-K serial range.
Hydraulic-kit notes
The PC20MR-1-K has a standard hydraulic pump flow of 20.6 gal/min (78 L/min) and a system relief pressure of 2490 psi (17167.9 kPa). Tools requiring high flow or high pressure must be verified against these specs. Auxiliary hydraulic kits for hammers or thumbs are aftermarket additions. The machine uses Komatsu EO or equivalent hydraulic fluid. Verify circuit availability with a dealer before installing high-demand tools.
All PC20MR-1-K(S/N 10001-UP) assemblies by section
Every catalogued assembly group for the Komatsu PC20MR-1-K(S/N 10001-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
3d74e-N3a Engine S/N 00102-Up
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Air Cleaner And Mounting
| YM***00 | Stay | 1 |
| YM***00 | Air Cleaner Ass'Y | 1 |
| YM***70 | Body | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Air Intake Manifold
| YM***62 | Bolt Plated | 2 |
| YM***01 | Manifold,Air Intake | 1 |
| YM***11 | Gasket,Air Intake Manifold | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Alternator (20a) (Inner Parts)
| YM***00 | Stator Ass'Y | 1 |
| YM***02 | Alternator A. (20a) | 1 |
| YM***00 | Nut,Ball | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Alternator And Mounting (20a)
| YM***40 | Screw | 1 |
| YM***30 | Plate,Adjust | 1 |
| YM***02 | Bolt | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Camshaft And Tappet
| YM***80 | Camshaft Ass'Y | 1 |
| YM***00 | Gear,Camshaft | 1 |
| YM***50 | Retainer, Bearing | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Crankshaft
| YM***80 | Bolt | 1 |
| YM***41 | Washer | 1 |
| YM***80 | Parallel Pin | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Cylinder Block
| YM***60 | Cylinder Block Ass'Y | 1 |
| YM***00 | Plug | 1 |
| YM***00 | Main Metal Ass'Y (Std) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Cylinder Block Accsessory
| YM***50 | Oil Pressure Transmitter | 1 |
| YM***20 | Plug,Drain(Without Oil Cooler Type) | 1 |
| YM***10 | Gauge,Oil | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Cylinder Head
| YM***80 | Retainer, Spring | 6 |
| YM***00 | Bolt,Head | 14 |
| YM***00 | Plug | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Cylinder Head Cover
| YM***00 | Pipe,Breather | 1 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***31 | Head Cover Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Drive Gear
| YM***22 | Retainer, Idle Gear | 1 |
| YM***02 | Nut | 1 |
| YM***00 | Ring, Snap | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Electrical Parts (Forwerded Individually Parts)
| YM***20 | Timer,Solenoid | 1 |
| YM***10 | Relay,Stop Solenoid | 1 |
| YM***10 | Limiter,Current | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Exhaust Manifold
| YM***02 | Screw | 2 |
| YM***02 | Screw | 2 |
| YM***02 | Nut | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Flywheel And Flywheel Housing
| YM***80 | Parallel Pin | 2 |
| YM***20 | Seal? Rear | 1 |
| YM***52 | Bolt Plated | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Front Cover And Oil Pump(#00102-00104)
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***02 | Nut | 3 |
| YM***40 | O-Ring,Drain Plug | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Front Cover And Oil Pump(#00105-)
| YM***40 | Cover | 1 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***91 | Case Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Front Hanger
| YM***00 | Hook,Front | 1 |
| YM***42 | Screw | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Fuel Filter (Inner Parts)
| YM***40 | Lever | 1 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***50 | Cartridge | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Fuel Filter And Piping
| YM***10 | Support | 1 |
| YM***01 | Swivel Joint, Assembly | 1 |
| YM***80 | Pipe Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Fuel Injection Pump (Pump) (Inner Parts)
| YM***00 | Valve W/Seat, Deliv | 3 |
| YM***01 | Plunger W/Barrel | 3 |
| YM***02 | Screw | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Fuel Injection Pump And Piping
| YM***20 | Retainer, Pipe | 1 |
| YM***11 | Pipe,Injection? No.1 | 1 |
| YM***30 | Pipe,Injection? No.3 | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Fuel Nozzle And Spill Hose
| YM***40 | Spacer, Valve Stop | 1 |
| YM***00 | Fuel Injection Valve, Assembly | 3 |
| YM***80 | Nut | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Gasket Kit
| YM***21 | Gasket (Kit) | 1 |
| YM***20 | Gasket (Kit) | 1 |
| YM***30 | Gasket (Kit) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Glow Plug
| YM***01 | Plug | 3 |
| YM***00 | Glow Plug | 3 |
| YM***20 | Connection Plugs | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Governor Control
| YM***00 | Pin, Cotter | 1 |
| YM***00 | Retainer, Shaft | 1 |
| YM***30 | Screw,Adjust | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Muffler
| YM***50 | Pipe | 1 |
| YM***62 | Bolt | 2 |
| YM***50 | Stay | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Oil Filter
| YM***50 | Cartridge,Engine Oil | 1 |
| YM***40 | Stud | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Oil Pan
| YM***80 | Oil Pan Ass'Y | 1 |
| YM***22 | Screw | 4 |
| YM***40 | Plug,Drain | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Oil Suction Pipe
| YM***30 | O-Ring (Kit) | 1 |
| YM***93 | Pipe Ass'Y,Oil Suction | 1 |
| YM***02 | Bolt,Stop Lever | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Piston And Connecting Rod
| YM***00 | Pin | 3 |
| YM***00 | Piston Ring Ass'Y | 1 |
| YM***10 | Crank Pin Metal A.,0.25mm (Us) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Rear Hanger
| YM***00 | Hook,Rear | 1 |
| YM***22 | Screw | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Rocker Arm
| YM***30 | Screw,Adjusting | 2 |
| YM***62 | Screw | 1 |
| YM***02 | Nut | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Starting Motor (Inner Parts)
| YM***90 | Bushing | 1 |
| YM***30 | Bushing | 1 |
| YM***40 | Lever | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Starting Motor And Mounting
| YM***52 | Bolt Plated | 2 |
| (Y***0) | Starting Motor Ass'Y,(See Fig.A6210-B0a1) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Tool
| YM***60 | Wrench,Fuel Filter? Water Separator | 1 |
| YM***50 | Screw Driver | 1 |
| YM***51 | Wrench,(For Engine Oil Filter) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Water Pump And Cooling Fan
| YM***02 | Bolt Plated | 2 |
| YM***22 | Screw | 2 |
| YM***60 | Spacer | 1 |
3d74e-N3ab Engine S/N 00102-Up
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Air Cleaner And Mounting
| YM***00 | Stay | 1 |
| YM***00 | Air Cleaner Ass'Y | 1 |
| YM***70 | Body | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Air Intake Manifold
| YM***62 | Bolt Plated | 2 |
| YM***01 | Manifold,Air Intake | 1 |
| YM***11 | Gasket,Air Intake Manifold | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Alternator (20a) (Inner Parts)
| YM***00 | Stator Ass'Y | 1 |
| YM***02 | Alternator A. (20a) | 1 |
| YM***00 | Nut,Ball | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Alternator And Mounting (20a)
| YM***40 | Screw | 1 |
| YM***30 | Plate,Adjust | 1 |
| YM***02 | Bolt | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Camshaft And Tappet
| YM***80 | Camshaft Ass'Y | 1 |
| YM***00 | Gear,Camshaft | 1 |
| YM***50 | Retainer, Bearing | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Crankshaft
| YM***80 | Bolt | 1 |
| YM***41 | Washer | 1 |
| YM***80 | Parallel Pin | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Cylinder Block
| YM***60 | Cylinder Block Ass'Y | 1 |
| YM***00 | Plug | 1 |
| YM***00 | Main Metal Ass'Y (Std) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Cylinder Block Accsessory
| YM***50 | Oil Pressure Transmitter | 1 |
| YM***20 | Plug,Drain(Without Oil Cooler Type) | 1 |
| YM***10 | Gauge,Oil | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Cylinder Head
| YM***80 | Retainer, Spring | 6 |
| YM***00 | Bolt,Head | 14 |
| YM***00 | Plug | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Cylinder Head Cover
| YM***00 | Pipe,Breather | 1 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***31 | Head Cover Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Drive Gear
| YM***22 | Retainer, Idle Gear | 1 |
| YM***02 | Nut | 1 |
| YM***00 | Ring, Snap | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Electrical Parts (Forwerded Individually Parts)
| YM***20 | Timer,Solenoid | 1 |
| YM***10 | Relay,Stop Solenoid | 1 |
| YM***10 | Limiter,Current | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Exhaust Manifold
| YM***02 | Screw | 2 |
| YM***02 | Screw | 2 |
| YM***02 | Nut | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Flywheel And Flywheel Housing
| YM***80 | Parallel Pin | 2 |
| YM***20 | Seal? Rear | 1 |
| YM***52 | Bolt Plated | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Front Cover And Oil Pump(#00105-)
| YM***40 | Cover | 1 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***91 | Case Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Front Hanger
| YM***00 | Hook,Front | 1 |
| YM***42 | Screw | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Fuel Filter (Inner Parts)
| YM***40 | Lever | 1 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***50 | Cartridge | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Fuel Filter And Piping
| YM***10 | Support | 1 |
| YM***01 | Swivel Joint, Assembly | 1 |
| YM***80 | Pipe Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Fuel Injection Pump (Pump) (Inner Parts)
| YM***00 | Valve W/Seat, Deliv | 3 |
| YM***01 | Plunger W/Barrel | 3 |
| YM***02 | Screw | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Fuel Injection Pump And Piping
| YM***20 | Retainer, Pipe | 1 |
| YM***11 | Pipe,Injection? No.1 | 1 |
| YM***30 | Pipe,Injection? No.3 | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Fuel Nozzle And Spill Hose
| YM***40 | Spacer, Valve Stop | 1 |
| YM***00 | Fuel Injection Valve, Assembly | 3 |
| YM***80 | Nut | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Gasket Kit
| YM***21 | Gasket (Kit) | 1 |
| YM***20 | Gasket (Kit) | 1 |
| YM***30 | Gasket (Kit) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Glow Plug
| YM***01 | Plug | 3 |
| YM***00 | Glow Plug | 3 |
| YM***20 | Connection Plugs | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Governor Control(#00105-)
| YM***00 | Weight Ass'Y | 1 |
| YM***00 | Pin, Cotter | 1 |
| YM***00 | Retainer, Shaft | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Muffler
| YM***50 | Pipe | 1 |
| YM***62 | Bolt | 2 |
| YM***50 | Stay | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Oil Filter
| YM***50 | Cartridge,Engine Oil | 1 |
| YM***40 | Stud | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Oil Pan
| YM***80 | Oil Pan Ass'Y | 1 |
| YM***22 | Screw | 4 |
| YM***40 | Plug,Drain | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Oil Suction Pipe
| YM***30 | O-Ring (Kit) | 1 |
| YM***93 | Pipe Ass'Y,Oil Suction | 1 |
| YM***02 | Bolt,Stop Lever | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Piston And Connecting Rod
| YM***00 | Pin | 3 |
| YM***00 | Piston Ring Ass'Y | 1 |
| YM***10 | Crank Pin Metal A.,0.25mm (Us) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Rear Hanger
| YM***00 | Hook,Rear | 1 |
| YM***22 | Screw | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Rocker Arm
| YM***30 | Screw,Adjusting | 2 |
| YM***62 | Screw | 1 |
| YM***02 | Nut | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Starting Motor (Inner Parts)
| YM***90 | Bushing | 1 |
| YM***30 | Bushing | 1 |
| YM***40 | Lever | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Starting Motor And Mounting
| YM***52 | Bolt Plated | 2 |
| (Y***0) | Starting Motor Ass'Y,(See Fig.A6210-B0a1) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Tool
| YM***60 | Wrench,Fuel Filter? Water Separator | 1 |
| YM***50 | Screw Driver | 1 |
| YM***51 | Wrench,(For Engine Oil Filter) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Water Pump And Cooling Fan
| YM***02 | Bolt Plated | 2 |
| YM***22 | Screw | 2 |
| YM***60 | Spacer | 1 |
Accessory
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Accessory : Spare Parts
| 07***85 | O-Ring,(For Snow Removing) | 1 |
| 07***34 | O-Ring,(For 2-Actuater Attachment) | 1 |
| 07***34 | O-Ring (K10) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Accessory : Tool (English)
| 07***50 | Pump, (Bellows Type) | 1 |
| 07***03 | Cartridge - Grease | 1 |
| 07***00 | Nozzle,(For Rubber Shoe) | 1 |
Cooling System
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Cooling System : Cooling (Radiator Inner Parts And Mounting Parts)
| 01***30 | Bolt - M8 X 30lg | 2 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 3 |
| 01***20 | Bolt? Wing,(Noise Suppression Spec.) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Cooling System : Cooling (Radiator Piping)
| 07***19 | Clamp, Hose | 4 |
| 20***20 | Hose | 1 |
| 20***32 | Hose | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Cooling System : Cooling (Radiator Reserve Tank And Piping)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 2 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
Electrical System
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Electrical System : Battery And Wiring
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***05 | Nut,(For Air Conditioner Less), Nut | 5 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Electrical System : Wiring Harness (1/2)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***10 | Bolt - Relay And Flasher Mounting | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 11 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Electrical System : Wiring Harness (2/2)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***12 | Screw,Sems | 2 |
| 01***16 | Screw | 3 |
Engine Related Parts
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Engine Related Parts : Damper
| 01***20 | Bolt,(For Mono Lever Steering) | 8 |
| 01***32 | Washer,(With Auto Emergency Steering) | 8 |
| 04***08 | Adapter Sleeves | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Engine Related Parts : Engine Mounting (Air Intake And Exhaust Piping)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***60 | Bolt,(With Body Positioner) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Engine Related Parts : Engine Mounting (Mounting Parts)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 12 |
| 01***00 | Bolt,For Weight Adjusting Bolt | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 12 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Engine Related Parts : Engine Mounting (Water Temperature Sensor And Harness Clip)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
| 08***10 | Connector, Clip | 1 |
Fuel Tank And Related Parts
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Fuel Tank And Related Parts : Fuel Tank
| 07***45 | Strainer, Filler Tube | 1 |
| 07***85 | Clip | 2 |
| 20***21 | Gauge,Fuel | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Fuel Tank And Related Parts : Fuel Tank (Drain Piping)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
| 07***59 | Clamp,See Fig. K4010-05a0 | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Fuel Tank And Related Parts : Fuel Tank (Fuel Gauge)
| 01***14 | Screw | 5 |
| 01***16 | Bolt - Starting Motor Ground Cable | 1 |
| 08***10 | Connector, Clip | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Fuel Tank And Related Parts : Fuel Tank (Fuel Piping)
| 01***16 | Screw | 2 |
| 01***16 | Bolt - Starting Motor Ground Cable | 5 |
| 04***10 | Clip | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Fuel Tank And Related Parts : Fuel Tank (Mounting Parts)
| 20***21 | Band | 1 |
| 20***60 | Cushion | 1 |
| 20***70 | Cushion | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Fuel Tank And Related Parts : Fuel Tank (Related Parts)
| 01***10 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***20 | Bolt,See Fig. K4010-11a0 | 2 |
| 20***31 | Bracket | 1 |
Guard
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Counter Weight
| 01***90 | Bolt | 3 |
| 01***60 | Flat Washer - M20 (Hardened) | 3 |
| 01***60 | Washer,(Without Rops Guard? Canopy) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Counter Weight (Additional Weight)
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***65 | Bolt,(Used With Pin Puller) | 2 |
| 01***10 | Capscrew | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Front Cover
| 01***20 | Bolt,(For Mono Lever Steering) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Hood (With Cab)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Hood (With Canopy)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Rear Protector (With Cab And Additional Weight)
| 01***30 | Bolt,(With Body Positioner) | 3 |
| 01***90 | Bolt | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Rear Protector (With Cab)
| 01***30 | Bolt,(With Body Positioner) | 3 |
| 01***15 | Bolt (Kit) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Rear View Mirror (For Cab)
| 01***30 | Screw | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 11***30 | Bolt | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Rear View Mirror (For Canopy)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 22***10 | Support,R.H | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Side Cover (L.H.) (With Cab)
| 01***20 | Bolt,(For Mono Lever Steering) | 5 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***12 | Screw | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Side Cover (L.H.) (With Canopy)
| 01***20 | Bolt,(For Mono Lever Steering) | 5 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 5 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Guard : Side Cover (R.H.)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
Hydraulic System
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Actuator Line (Boom And Arm Cylinder Hose)
| 22***11 | Hose | 4 |
| 22***21 | Hose | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Actuator Line (Piping Related Parts)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 20***60 | Protector | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Actuator Line (Swing Motor Hose? 1/2) : Unit_02_of_02
| 08***34 | Tie, Cable | 6 |
| 20***51 | Sheet | 2 |
| 22***81 | Hose | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Actuator Line (Swing Motor Hose? 1/2) : Unit_01_of_02
| 20***50 | Hose | 1 |
| 22***20 | Hose | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Actuator Line (Swivel Joint Hose? 1/2)
| 20***41 | Hose,Blade Cylinder | 1 |
| 22***41 | Hose | 2 |
| 22***51 | Hose | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Actuator Line (Swivel Joint Hose? 2/2)
| 22***71 | Hose | 1 |
| 22***10 | Hose | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Additional Valve (1-Way)
| (7***0) | Valve Sub Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Attachment Line (2-Way)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Delivery Line
| 07***08 | Plug,See Fig. K4010-63a0 | 1 |
| 20***10 | Hose | 1 |
| 20***10 | Nozzle | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Drain Line
| 07***12 | Tube | 1 |
| 07***12 | Sleeve,(For Long Lever Control) | 2 |
| 07***14 | Nut,(For Long Lever Control) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Hydraulic Tank
| 01***20 | Bolt,(Without Air Con. Or Heater) | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 8 |
| 01***23 | Washer,(With Auto Emergency Steering) | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Main Pump (Hydraulic Pump And Related Parts)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Return Line
| 01***16 | Bolt - Starting Motor Ground Cable | 2 |
| 07***16 | Hose | 1 |
| 07***35 | Clamp | 8 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Hydraulic System : Suction Line
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
| 07***45 | Clamp,Hose | 3 |
| 07***55 | Clamp, Hose | 1 |
Main/Revolving Frame And Related Parts
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Main/Revolving Frame And Related Parts : Boom Swing Bracket
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Main/Revolving Frame And Related Parts : Boom Swing Cylinder
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
| 04***12 | Lock,(With Rain Cap) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Main/Revolving Frame And Related Parts : Revolving Frame
| 01***12 | Bolt - M8 - 1.25 X 12 | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***16 | Bolt - Starting Motor Ground Cable | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Main/Revolving Frame And Related Parts : Revolving Frame Lubrication Piping
| 07***00 | Fitting, Grease - Upper Hinge Pin | 2 |
| 21***11 | Nipple | 4 |
| 22***20 | Tube | 1 |
Marks And Plates
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Marks And Plates : Marks And Plates (For Additional Counter Weight) (Pc20mrx)
| 01***16 | Washer,(For 35a Alternator) | 2 |
| 21***60 | Screw | 2 |
| 22***21 | Plate | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Marks And Plates : Marks And Plates (For Counter Weight) (Pc20mr)
| 01***16 | Washer,(For 35a Alternator) | 2 |
| 21***60 | Screw | 2 |
| 22***21 | Plate | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Marks And Plates : Marks And Plates (Operating Plate) (English)
| 09***00 | Plate? Safety,Operating Pattern Table (Jis) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Marks And Plates : Marks And Plates (With Cab) (English)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 8 |
| 09***30 | Plate? Name,(Limited Supply) | 1 |
| 09***05 | Plate? Name,Tops (Limited Supply) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Marks And Plates : Marks And Plates (With Canopy) (English)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 8 |
| 09***30 | Plate? Name,(Limited Supply) | 1 |
| 09***05 | Plate? Name,Tops (Limited Supply) | 1 |
Operator'S Compartment And Control System
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Accelerator Control Lever
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 1 |
| 01***35 | Bolt, Stopper | 1 |
| 01***60 | Bolt | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Ashtray (For Cab)
| 21***20 | Ashtray | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Attachment Pedal (2-Way)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***20 | Screw | 2 |
| 01***11 | Nut - Mounting | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Blade Control Lever
| 01***30 | Bolt,Stopper | 2 |
| 01***35 | Bolt, Stopper | 2 |
| 01***05 | Nut,L.H. (For Trimming Dozer) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Bucket Control Lever
| 08***21 | Band,(For One Touch Decel) | 1 |
| 20***11 | Switch? Knob,Horn | 1 |
| 20***80 | Plate | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Canopy (Canopy And Work Lamp Bracket)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Car Heater Piping
| 01***08 | Screw | 4 |
| 01***16 | Bolt? Wing,Wing | 2 |
| 01***16 | Bolt, Mount Solenoid Valve | 7 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Floor Frame (Floor Plate? Front) (With Cab)
| 01***16 | Bolt? Wing,Wing | 2 |
| 01***16 | Bolt, Mount Solenoid Valve | 2 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 5 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Floor Frame (Floor Plate? Front) (With Canopy)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***20 | Bolt,(Without Air Con.) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Floor Frame (Floor Plate? Rear) (With Cab)
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***35 | Bolt, Cover | 1 |
| 01***16 | Washer,Radio Controlled Slag Handling | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Floor Frame (Floor Plate? Rear) (With Canopy)
| 01***20 | Bolt,(Forwarded Individually Parts) | 4 |
| 01***16 | Washer,Radio Controlled Slag Handling | 4 |
| 22***70 | Garnish | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Floor Frame (Travel Speed Pedal) (With Cab)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***08 | Washer | 1 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Floor Frame (Travel Speed Pedal) (With Canopy)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***08 | Washer | 1 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Floor Mat
| 22***11 | Mat,Floor | 1 |
| 22***13 | Mat,Floor | 1 |
| 22***40 | Sheet | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Floor Mat (For Cab And Attachment)
| 22***11 | Mat,Floor | 1 |
| 22***12 | Mat,Floor | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Handrail
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***25 | Capscrew | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 7 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Blade)
| 01***05 | Nut,L.H. (For Trimming Dozer) | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
| 04***32 | Pin, Spring | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Main Control Valve And Mounting Parts)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(With Body Positioner) | 5 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Main Control Valve Connecting Parts? 1/2)
| 07***23 | O-Ring,(For 2nd Travel Speed) (Op) | 3 |
| 07***23 | O-Ring,(For 2nd Travel Speed) (Op) | 17 |
| 07***34 | O-Ring,(For 2-Actuater Attachment) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Main Control Valve Connecting Parts? 2/2)
| 07***23 | O-Ring,(For 2nd Travel Speed) (Op) | 8 |
| 20***60 | Nipple | 1 |
| 21***60 | Nipple | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Main Valve Piping)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Solenoid Valve And Piping)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Swing)
| 01***25 | Bolt,(Rear Attachment Less) | 1 |
| 01***30 | Bolt - M8 X 30lg | 1 |
| 01***30 | Bolt,(With Body Positioner) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Travel Alarm Switch)
| 01***20 | Bolt,(Without Air Con. Or Heater) | 4 |
| 01***16 | Bolt | 4 |
| 01***23 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Travel) (1/2)
| 01***16 | Bolt - Box Mounting | 1 |
| 01***35 | Bolt, Stopper | 2 |
| 01***40 | Bolt | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Travel) (2/2)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 4 |
| 01***05 | Nut,L.H. (For Trimming Dozer) | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Valve Bracket)
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***16 | Bolt, Mount Solenoid Valve | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Work Equipment Stand And Cable Mounting Parts)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***40 | Bolt (Op) | 6 |
| 01***16 | Washer,(For 35a Alternator) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Work Equipment)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 04***24 | Pin, Spring | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (1/13) (Cab)
| 01***16 | Bolt - Seat And Tether Belt Mounting | 4 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 1 |
| 01***12 | Screw | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (10/13) (Radio) (Option)
| 01***10 | Screw | 4 |
| 01***08 | Washer | 4 |
| 17***20 | Washer | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (11/13) (Window Washer)
| 01***12 | Screw (2) | 2 |
| 20***20 | Nozzle Ass'Y | 1 |
| 20***70 | Hose | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (12/13) (Lamp)
| 01***16 | Screw,(Sandy And Dusty Terrain S.) | 2 |
| 01***05 | Washer,(Without Window Washer) | 2 |
| 08***00 | Lamp,Room | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (13/13) (Handle)
| 01***32 | Washer, (Without Emergency Steering) | 2 |
| 11***30 | Bolt | 2 |
| 20***21 | Grip | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (2/13) (Door? 1/2)
| 01***10 | Bolt,(With Auto Emergency Steering) | 12 |
| 01***16 | Bolt - Seat And Tether Belt Mounting | 7 |
| 01***25 | Bolt,(Without Gps Antenna Bracket) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (3/13) (Door? 2/2)
| 01***16 | Bolt - Box Mounting | 4 |
| 01***08 | Screw - Clip Mounting | 5 |
| 01***10 | Bolt | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (4/13) (Pull Up)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***12 | Screw,(Not Shown) (For Std Cab) | 2 |
| 01***16 | Screw | 5 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (5/13) (Window)
| 01***12 | Screw | 6 |
| 01***08 | Bolt | 4 |
| 01***10 | Bolt | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (6/13) (Inside Cover)
| 01***20 | Screw | 8 |
| 01***10 | Screw | 3 |
| 01***10 | Bolt | 8 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (7/13) (Door Catch)
| 01***16 | Bolt - Box Mounting | 12 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 4 |
| 01***12 | Screw | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (8/13) (Hammer)
| 01***20 | Screw | 2 |
| 21***40 | Hammer | 1 |
| (2***0) | Cab Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (9/13) (Wiring)
| 01***14 | Screw | 1 |
| 22***50 | Clip | 1 |
| 22***70 | Duct | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (Cab Related Parts)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 6 |
| 01***90 | Capscrew | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Cab (Tool Box And Ashtray)
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 2 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 2 |
| 09***60 | Plate? Mark,Komatsu | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat (With Armrest)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 4 |
| 01***16 | Bolt, Mount Solenoid Valve | 4 |
| 01***06 | Nut | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat (With Suspension And Armrest)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***25 | Bolt,(Rear Attachment Less) | 4 |
| 01***20 | Screw,(Tbg/Abe Spec.) | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand
| 01***03 | Nut, L. H. Thread | 1 |
| 01***05 | Nut,(For Air Conditioner Less), Nut | 1 |
| 01***23 | Plain Washer | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand Panel Box (L.H.) (1/2)
| 01***23 | Washer,(Without Air Con.) | 6 |
| 09***10 | Cap,(For Joy Stick Steering) | 1 |
| 20***50 | Screw | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand Panel Box (L.H.) (2/2) (With Cab)
| 01***12 | Bolt - Front Cover Mounting | 1 |
| 01***23 | Washer,(With Auto Emergency Steering) | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand Panel Box (L.H.) (2/2) (With Canopy)
| 01***12 | Bolt - Front Cover Mounting | 1 |
| 01***23 | Washer,(With Auto Emergency Steering) | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand Panel Box (R.H. Side)
| 01***05 | Nut,(For Air Conditioner Less), Nut | 4 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 4 |
| 01***23 | Washer,(Without Air Con.) | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand (Buzzer?Starting Switch And Wiring)
| 01***16 | Bolt - Box Mounting | 2 |
| 01***20 | Bolt,(Without Air Con. Or Heater) | 2 |
| 01***16 | Bolt - Seat And Tether Belt Mounting | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand (With Cab)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 3 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 3 |
| 08***12 | Grommet,(Not Used For Cab Spec.) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand (With Canopy)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 2 |
| 09***12 | Cap,(With Auto Emergency Steering) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand Mounting Parts (With Cab)
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand Mounting Parts (With Canopy)(#10001-10538)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Operator'S Seat Stand Mounting Parts (With Canopy)(#10539-)
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : P.P.C. Line (L.H. Side)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : P.P.C. Line (R.H. Side)
| 07***23 | O-Ring,(For 2nd Travel Speed) (Op) | 4 |
| 08***21 | Band,(For One Touch Decel) | 5 |
| 21***60 | Nipple | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : P.P.C. Valve And Mounting Parts (L.H. Side)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 3 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : P.P.C. Valve And Mounting Parts (R.H. Side)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 3 |
| 01***30 | Bolt,(With Body Positioner) | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Panel Wiring (Blade And Travel Speed Control Lever)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 5 |
| 01***25 | Screw | 4 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Panel Wiring (Harness And Lamp Switch)
| 01***16 | Screw,(P.O.C. Model) (Except Japan) | 2 |
| 01***23 | Washer,(With Auto Emergency Steering) | 2 |
| 08***00 | Diode,Diode | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Panel Wiring (Monitor? Relay And Buzzer)
| 01***12 | Screw,Sems | 5 |
| 01***16 | Screw | 3 |
| 01***20 | Screw, Machine | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Panel Wiring (R.H. Console Cover)
| 01***12 | Bolt,(With Speedometer) | 1 |
| 01***16 | Bolt, Mount Solenoid Valve | 5 |
| 01***20 | Bolt,(Forwarded Individually Parts) | 5 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Seat Belt
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 20***11 | Seat Belt Ass'Y,(Belt Width 3 Inch) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Stand Bracket (L.H.)
| 01***20 | Bolt,(Without Air Con.) | 2 |
| 01***25 | Bolt | 3 |
| 01***10 | Nut,(Without Air Conditioner) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Stand Bracket (R.H. Side) (With Cab)
| 01***20 | Bolt,(Forwarded Individually Parts) | 5 |
| 22***70 | Sheet | 1 |
| 22***11 | Bracket Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Stand Bracket (R.H. Side) (With Canopy)
| 01***20 | Bolt,(Forwarded Individually Parts) | 5 |
| 22***60 | Hinge (Welded) | 1 |
| 22***11 | Bracket Ass'Y,R.H | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Swing Control Lever
| 20***10 | Knob,Horn | 1 |
| 20***80 | Plate | 1 |
| 20***90 | Nut | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Travel Pedal
| 01***25 | Bolt,(Rear Attachment Less) | 4 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 4 |
| 22***10 | Pedal,L.H | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Window Washer (For Cab)
| 01***16 | Screw | 2 |
| 08***08 | Grommet,(Without Beacon Lamp) | 1 |
| 20***10 | Band | 5 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Operator'S Compartment And Control System : Work Equipment Lock Lever And Linkage (L.H. Side)
| 01***12 | Bolt - Front Cover Mounting | 1 |
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 2 |
| 01***04 | Nut,(For Air Conditioner Less) | 1 |
Service Kit And Component Parts
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Ls Valve
| 07***34 | O-Ring,(For Without Brake Assistor) | 1 |
| 70***60 | Seal | 1 |
| 70***20 | Valve Ass'Y,Ls | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (1/10)(#10001-11327)
| 04***15 | Bolt,Eye | 2 |
| 72***20 | Cover,Valve | 1 |
| 72***01 | Control Valve | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (10/10)(#10001-11327)
| 07***34 | O-Ring,(For Without Brake Assistor) | 2 |
| 72***00 | Valve Ass'Y,Suction | 2 |
| 72***00 | Valve Ass'Y,Suction | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (2/10)(#10001-11327)
| 01***30 | Bolt - M8 X 30lg | 4 |
| 01***23 | Washer,(For Shipping) | 8 |
| 07***04 | O-Ring | 7 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (3/10)(#10001-11327)
| (7***1) | Control Valve | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (4/10)(#10001-11327)
| 07***04 | O-Ring | 1 |
| 07***23 | O-Ring; Was 07002-10823, O-Ring,(Not Shown) | 1 |
| 70***30 | Ball | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (5/10)(#10001-11327)
| 01***10 | Screw | 11 |
| 01***12 | Bolt | 3 |
| 01***16 | Screw | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (6/10)(#10001-11327)
| 07***23 | O-Ring (K8) | 14 |
| 07***34 | O-Ring,(For 2-Actuater Attachment) | 4 |
| 72***60 | O-Ring | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (7/10)(#10001-11327)
| 01***30 | Screw | 3 |
| 07***07 | O-Ring - (K10) | 10 |
| 07***09 | O-Ring,(For Dual Tilt Dozer) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (8/10)(#10001-11327)
| 70***10 | O-Ring (Kit) | 1 |
| 70***20 | Ring, Back-Up | 1 |
| 70***90 | O-Ring,Suction | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (9/10)(#10001-11327)
| 07***34 | O-Ring,(For 2-Actuater Attachment) | 1 |
| 70***10 | O-Ring (Kit) | 1 |
| 72***00 | Valve Ass'Y,Relief | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (1/12)(#11328-)
| 04***15 | Bolt,Eye | 2 |
| 72***20 | Cover,Valve | 1 |
| 72***50 | Cover,Valve | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (10/12)(#11328-)
| 07***34 | O-Ring,(For Without Brake Assistor) | 2 |
| 72***00 | Valve Ass'Y,Suction | 2 |
| 72***00 | Valve Ass'Y,Suction | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (11/12)(#11328-)
| 01***20 | Screw | 2 |
| 01***40 | Screw | 2 |
| 07***07 | O-Ring - (K10) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (12/12)(#11328-)
| 07***34 | O-Ring,(For Without Brake Assistor) | 1 |
| 72***00 | Valve Ass'Y,Suction | 2 |
| (7***1) | Control Valve | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (2/12)(#11328-)
| 01***65 | Capscrew | 4 |
| 01***23 | Washer,(For Shipping) | 8 |
| 07***04 | O-Ring | 7 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (3/12)(#11328-)
| (7***1) | Control Valve | 1 |
| (7***0) | Control Valve | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (4/12)(#11328-)
| 07***04 | O-Ring | 1 |
| 07***23 | O-Ring; Was 07002-10823, O-Ring,(Not Shown) | 1 |
| 70***30 | Ball | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (5/12)(#11328-)
| 01***10 | Screw | 11 |
| 01***12 | Bolt | 3 |
| 01***16 | Screw | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (6/12)(#11328-)
| 07***23 | O-Ring (K8) | 14 |
| 07***34 | O-Ring,(For 2-Actuater Attachment) | 4 |
| 72***60 | O-Ring | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (7/12)(#11328-)
| 01***30 | Screw | 3 |
| 07***07 | O-Ring - (K10) | 10 |
| 07***09 | O-Ring,(For Dual Tilt Dozer) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (8/12)(#11328-)
| 70***10 | O-Ring (Kit) | 1 |
| 70***20 | Ring, Back-Up | 1 |
| 70***90 | O-Ring,Suction | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (9-Valve) (9/12)(#11328-)
| 07***34 | O-Ring,(For 2-Actuater Attachment) | 1 |
| 70***10 | O-Ring (Kit) | 1 |
| 72***00 | Valve Ass'Y,Relief | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Ppc Valve (For Attachment)
| 01***25 | Bolt, Seal Cover Mounting | 2 |
| 70***70 | Pilot Valve,(See Fig.Y1670-21a0) | 1 |
| 70***40 | Shim - 0.012 In. (0.30 mm) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Ppc Valve (For Work Equipment)
| 01***20 | Bolt,(Without Air Con. Or Heater) | 4 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
| 07***20 | O-Ring,(0202-007) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Service Valve : Unit_02_of_02
| 01***85 | Bolt - M8 X 85lg | 4 |
| 01***20 | Screw | 2 |
| 01***40 | Screw | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Service Kit And Component Parts : Service Valve : Unit_01_of_02
| 01***65 | Capscrew | 4 |
| 01***20 | Screw | 2 |
| 01***40 | Screw | 2 |
Swing Circle And Related Parts
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Swing Circle And Related Parts : Swing Circle
| 01***60 | Bolt,For Weight Adjusting Bolt | 32 |
| 04***28 | Pin, Dowel - Transmission Case, Pin-Dowel | 2 |
| 20***02 | Circle,Swing | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Swing Circle And Related Parts : Swing Machinery And Motor
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 4 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 4 |
| 07***11 | O-Ring,(Tm8202-009) | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Swing Circle And Related Parts : Swivel Joint
| 01***30 | Bolt,(With Body Positioner) | 6 |
| 01***32 | Washer,(With Auto Emergency Steering) | 6 |
| 07***10 | Connector, At Case | 2 |
Travel And Lower Piping
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Travel And Lower Piping : Final Drive
| 01***30 | Screw | 20 |
| 01***32 | Washer, (Without Emergency Steering) | 20 |
| 07***11 | O-Ring,(Tm8202-009) | 6 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Travel And Lower Piping : Lower Piping
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
| 04***10 | Clip,(See Fig.0311a Or 0321) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Travel And Lower Piping : Sprocket
| 01***30 | Screw | 18 |
| 01***32 | Washer, (Without Emergency Steering) | 18 |
| 20***10 | Sprocket | 2 |
Under Carriage
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Carrier Plate
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 20***40 | Plate | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Front Idler(#10001-11878)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 4 |
| 01***60 | Bolt,For Weight Adjusting Bolt | 8 |
| 01***50 | Bolt | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Front Idler(#11879-)
| 01***20 | Bolt, Wiring Harness Mounting Bracket | 4 |
| 01***60 | Bolt,For Weight Adjusting Bolt | 8 |
| 01***45 | Capscrew - M10 X 1.25 | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Idler Cushion (For Rubber Shoe)
| 01***26 | Nut | 1 |
| 04***40 | Pin,Cotter (Kit) | 1 |
| 20***05 | Spring Ass'Y | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Idler Cushion (For Steel Shoe)
| 01***26 | Nut | 1 |
| 04***40 | Pin,Cotter (Kit) | 1 |
| 20***05 | Spring Ass'Y | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Track Frame
| 20***12 | Frame,Track | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Track Frame Cover
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***20 | Capscrew | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Track Guard (For Steel Shoe)
| 01***11 | Nut (Welded) | 12 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 12 |
| 20***11 | Bolt | 12 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Track Roller
| 01***30 | Bolt - M14 X 30lg | 12 |
| 01***45 | Washer,(For Quick Shift) (Mitsubishi) | 12 |
| 07***21 | O-Ring,Water Piping | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Track Shoe (Rubber Shoe)
| 20***01 | Shoe,Rubber | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Under Carriage : Track Shoe (Steel Shoe)
| 20***00 | Track Shoe Ass'Y | 1 |
| 20***00 | Shoe Ass'Y,Regular | 76 |
| 20***00 | Shoe Ass'Y,Master | 2 |
Work Equipment
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Arm (Arm And Bucket Cylinder Hose)
| 07***75 | Fitting,Grease (Without Lub. Piping) | 1 |
| 07***03 | Bushing | 4 |
| 07***30 | Seal,Dust (Kit) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Arm (Arm And Bucket Cylinder Hose) (Long Arm)
| 07***75 | Fitting,Grease (Without Lub. Piping) | 1 |
| 07***03 | Bushing | 4 |
| 07***30 | Seal,Dust (Kit) | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Arm (Mounting Pin)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Arm (Mounting Pin) (Long Arm)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Arm Cylinder
| (7***0) | Cylinder Group,Arm | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Blade
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 04***06 | Lock,Plate | 2 |
| 07***75 | Fitting,Grease (Without Lub. Piping) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Blade Lift Cylinder And Cover
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 4 |
| 01***16 | Bolt - Starting Motor Ground Cable | 2 |
| 04***06 | Lock,Plate | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Boom
| 07***35 | Seal,Dust (Kit) | 2 |
| 20***30 | Bushing | 2 |
| 22***00 | Boom Ass'Y | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Boom (Arm Cylinder And Bucket Cylinder Tube)
| 01***55 | Screw | 1 |
| 01***16 | Bolt, Mount Solenoid Valve | 3 |
| 01***25 | Bolt - Relay Mounting | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Boom (Arm? Arm Cylinder And Boom Cylinder Mounting Pin)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***30 | Bolt,(Not Used When Towing Winch) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Boom (Boom And Arm Cylinder Hose)
| 01***45 | Screw | 1 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 1 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Boom (Work Lamp And Related Parts)
| 01***12 | Bolt - M8 - 1.25 X 12 | 1 |
| 01***23 | Washer, Wiring Harness Mounting Bracket | 1 |
| 04***08 | Clip | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Boom Cylinder And Guard (With Cab)
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 20***10 | Guide | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Breaker And Attachment Line
| 01***50 | Capscrew | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Breaker And Attachment Line (For Long Arm)
| 01***50 | Capscrew | 1 |
| 01***20 | Bolt,(For Mono Lever Steering) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Bucket Cylinder
| 20***30 | Band | 2 |
| (7***0) | Cylinder Group,Bucket | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Bucket Link
| 01***20 | Bolt,(For Mono Lever Steering) | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 04***10 | Lock,Plate | 2 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Bucket Pin
| 01***75 | Bolt (M10-1.50x75) | 2 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 4 |
| 07***00 | Fitting, Grease - Upper Hinge Pin | 1 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Bucket? 0.025m3 (Mini 0.033m3) 320mm Width (Kuc Spec.)
| 20***60 | Adapter (Welded) | 3 |
| 20***70 | Tooth | 3 |
| 20***81 | Pin | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Bucket? 0.035m3 (Mini 0.044m3) 420mm Width (Kuc Spec.)
| 20***60 | Adapter (Welded) | 3 |
| 20***70 | Tooth | 3 |
| 20***81 | Pin | 3 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Bucket? 0.05m3 (Mini 0.066m3) 500mm Width (Kuc Spec.)
| 20***51 | Lip (Welded) | 1 |
| 20***60 | Adapter (Welded) | 4 |
| 20***70 | Tooth | 4 |
Komatsu : Pc20mr-1-K(S/N 10001-Up) : Work Equipment : Bucket? 0.06m3 (Mini 0.08m3) 600mm Width (Kuc Spec.)
| 20***60 | Adapter (Welded) | 4 |
| 20***70 | Tooth | 4 |
| 20***81 | Pin | 4 |
PC20MR-1-K(S/N 10001-UP) serial number reference
Locate the riveted metal serial plate on the right-hand side of the lower frame, typically behind the front idler or beneath the operator's window. Read the model code (e.g., PC20MR-1) and the sequential serial number (S/N) stamped on the plate; the prefix is the alphanumeric model identifier preceding the dash-number.
| Prefix | Identifies | Notes |
|---|---|---|
| PC20MR-1 | Standard undercarriage | Factory parts catalogs list PC20MR-1 for S/N 10001-UP. This prefix covers the initial production run of the PC20MR-1-K series. |
| PC20MR-2 | Standard undercarriage | Factory parts catalogs list PC20MR-2 for S/N 15001-UP. This indicates a production break or model update occurred at serial 15001. The PC20MR-1-K family covers the earlier portion of the 10001-UP range. |
Frequently asked questions
What engine does the Komatsu PC20MR-1-K use?
The Komatsu PC20MR-1-K is equipped with a Komatsu diesel engine, typically a 3-cylinder or 4-cylinder model from the 3D88E or 4D88E series, designed for low emissions and high torque at low RPMs.
What is the operating weight of the PC20MR-1-K?
The operating weight of the Komatsu PC20MR-1-K varies by configuration, ranging from approximately 2,140 kg to 2,610 kg depending on the undercarriage width, counterweight, and attachment package.
What model replaced the Komatsu PC20MR-1-K?
The Komatsu PC20MR-2 succeeded the PC20MR-1-K, featuring updated emissions compliance, improved hydraulic systems, and enhanced operator comfort features.
What PC20MR-1-K(S/N 10001-UP) owners discuss
What are the typical hydraulic behaviors observed in the Komatsu PC20MR-1-K when operating in varying temperatures?
Operators report that hydraulic functions may become sluggish when the oil is cold, normalizing as the system warms. A common diagnostic pattern is weak performance at operating temperature, which indicates internal leakage in the pump, control valve, or cylinders rather than a simple cold-start issue. If all functions slow simultaneously, check the hydraulic oil level, filter condition, and engine RPM under load before inspecting individual circuits. If only one function is slow, investigate the specific cylinder, control valve spool, or hose restriction for that circuit. Always compare performance in both directions (e.g., boom raise vs. lower) to isolate mechanical binding from hydraulic leakage. Have your dealer verify pressure settings if performance drops significantly when hot.
What undercarriage and wear patterns are typical for this mini-excavator class?
The PC20MR-1-K features a compact tail swing design, making undercarriage wear critical in tight spaces. Common wear points include track pins, bushings, and rollers, which degrade faster in abrasive environments. Track tension should be checked regularly, as repeated loosening often points to adjuster failure or component wear rather than just normal operation. If the machine pulls to one side during travel, check for mud packed in the undercarriage, roller condition, and track-chain wear before diagnosing hydraulic travel motors. Final drive noise may indicate low oil levels or contamination. Have your dealer verify final drive oil levels and track tension specifications.
What engine quirks or power loss issues are associated with the PC20MR-1-K series?
Engine power loss under heavy digging load is often caused by airflow restrictions or fuel delivery issues rather than internal engine failure. Check the air filter, fuel filters, fuel tank venting, and intake hoses for blockages or damage. If the engine RPM drops heavily when hydraulics are engaged, the hydraulic system may be overloading the engine or the engine may be unable to produce rated power. Overheating during heavy excavation is common if the cooling package (radiator, hydraulic oil cooler, charge-air cooler) is clogged with debris between the heat exchangers. Ensure coolant levels are correct when cold and inspect fan operation. Have your dealer verify engine timing and fuel injector calibration if power loss persists.
What are common electrical or sensor issues reported by owners?
Komatsu excavators rely on electronic control systems, so a single faulty sensor or unstable power supply can trigger multiple warning signals. Owners report intermittent starting, dashboard failures, or random shutdowns. Common electrical checks include battery state of charge, terminal condition, engine and chassis grounds, and the main starter cable. If the machine displays multiple fault codes, inspect battery voltage, ground connections, and connectors for corrosion or looseness. A battery may show acceptable voltage until the starter is loaded; perform a load test if voltage collapses during cranking. Have your dealer verify the EPC system and engine controller power supply if fault codes persist.
What should be checked when buying a used PC20MR-1-K (S/N 10001-UP)?
Verify the exact serial number to confirm the engine model and emission tier, as specifications vary by configuration and series. Check the hydraulic oil condition and level, and inspect for brass chunks in the suction strainer, which indicate pump wear. Test all hydraulic functions cold and hot to identify internal leakage. Inspect the undercarriage for track tension, roller wear, and pin/bushing condition. Check the cooling package for debris between heat exchangers. Verify engine operation under load to ensure no power loss or overheating. Review the maintenance history for filter changes and fluid replacements. Have your dealer verify the machine's serial range specifications and perform a comprehensive hydraulic pressure test.
How does the PC20MR-1-K handle swing performance and drift issues?
If the swing is slow or weak, compare it with other hydraulic functions. If all functions are slow, look for a common hydraulic issue. If only swing is weak, check the swing motor, control valve circuit, pilot controls, and swing brake release system. If the upper structure drifts or will not hold position, inspect the swing brake and mechanical play in the swing bearing. Test swing in both directions; poor performance in one direction may indicate a directional valve issue. Have your dealer verify the swing brake adjustment and swing bearing clearance.
What are the key maintenance points for the PC20MR-1-K's cooling and fluid systems?
The PC20MR-1-K uses Komatsu-specified hydraulic oil and engine oil. Check hydraulic oil level and condition regularly, and replace filters as per the maintenance schedule. Inspect the cooling package, including the radiator, hydraulic oil cooler, and charge-air cooler, for debris. Ensure coolant levels are correct when cold. The machine features easily accessible maintenance points through the bonnets. Tilting the cab allows access to under-hood components. Use Komatsu Genuine fluids or approved equivalents. Have your dealer verify fluid specifications and cooling system pressure integrity.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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