Komatsuhydraulic excavatorsmall ( - pc90)
Komatsu PC20MRX-1(S/N 10001-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu PC20MRX-1 is a mini excavator in the 20-ton class, powered by a Komatsu 3D74E engine producing 18 HP (13 kW) net and 20.1 HP (15.0 kW) gross. It has an operating weight of 4830 lbs (2191 kg) and a maximum digging depth of 94 in. (238 cm). The machine features a compact tail swing radius of 32.4 in. (82.3 cm) and an overall width of 57.6 in. (146.3 cm). It is designed for tight access jobsites and utility work.
The PC20MRX-1 succeeded the PC20MR-1-K and was later replaced by the PC20MR-2. The machine matters in the used and parts market due to its widespread use in municipal and utility applications, where its compact size and reliability are valued. The availability of parts for the 3D74E engine and the hydraulic system ensures long-term serviceability for this generation.
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 PC20MRX-1(S/N 10001-UP) specifications
Engine
| Model | 3D74E |
| Gross Power | 20.1 HP (15.0 kW) |
| Net Power | 18 HP (13 kW) |
| Displacement | 61 cu. in. (1006.2 cc) |
| 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 | 4830 lbs (2191 kg) |
| Ground Pressure | 4.6 psi (31.7 kPa) |
| Transport Weight | 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 | 57.6 in. (146.3 cm) |
| Transport Height | 96.0 in. (243.8 cm) |
| Tail Swing Radius | 32.4 in. (82.3 cm) |
| Track Shoe Width | 9.9 in. (25.1 cm) |
| Ground Clearance | 12.0 in. (30.5 cm) |
| Undercarriage Length | 876.0 in. (2225.0 cm) |
Performance
| Max Dig Depth | 94 in. (238 cm) |
| Max Reach at Ground | 163.2 in. (414.5 cm) |
| Max Dump Height | 102.0 in. (259.1 cm) |
| Max Cutting Height | 152.4 in. (387.1 cm) |
| Swing Speed | 9.3 RPM |
| Travel Speed | 3 mph (4.8 km) |
| 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 | 6.7 gal (25.4 l) |
| Hydraulic System/Tank | 5.6 gal (21.2 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.
PC20MRX-1(S/N 10001-UP) fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 2.4 L (0.63 US gal) | Komatsu EO (SAE 15W-40 for general use; SAE 5W-30 or 10W-30 for cold climates below -10°C / 14°F) |
| Cooling system | 5.6 L (1.5 US gal) | Super Coolant AF-NAC (pre-mixed) or Komatsu Super Coolant concentrate mixed with demineralized water at 50/50 ratio |
| Fuel tank | 25.4 L (6.7 US gal) | Ultra-low sulfur diesel (ULSD) meeting ASTM D975 or EN 590 standards |
| Hydraulic system total | 21.2 L (5.6 US gal) | Komatsu TO-15 or equivalent ISO VG 46 hydraulic oil meeting Komatsu EO specification |
| Hydraulic tank | 21.2 L (5.6 US gal) | Komatsu TO-15 or equivalent ISO VG 46 hydraulic oil meeting Komatsu EO specification |
| Final drive (each) | 0.4 L (0.1 US gal) | Komatsu AX-1 or equivalent ISO VG 80 gear oil |
| Swing drive | 0.4 L (0.1 US gal) | Komatsu AX-1 or equivalent ISO VG 80 gear oil |
| Pilot/other circuits | Not documented for this exact serial range — verify with your dealer | Not documented for this exact serial range — verify with your dealer |
| Grease (spec only) | N/A | Komatsu Lithium Complex Grease or equivalent EP2 grade lithium complex grease |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Komatsu PC20MRX-1(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 PC20MRX-1(S/N 10001-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and hydraulic oil contamination. Check the hydraulic oil level in the sight glass daily. Inspect the air filter restriction indicator before each shift. Monitor the coolant SCA concentration at 500 hours to prevent corrosion and scaling in the 3D74E engine cooling system. Track KOMTRAX data for fuel consumption and load frequency to anticipate component stress.
Corrective & Common Repairs
Address hydraulic hose leaks immediately to prevent system contamination. Replace the hydraulic return filter at 500 hours to protect the main pump. Inspect the final drive oil for metal particles at 1000 hours. Check the track tension and adjust if the sag exceeds specifications. Replace worn track shoes and pins to maintain ground pressure and undercarriage life. Verify the swing bearing play during the 1000-hour structural inspection.
Overhaul & Rebuild Points
Plan for a hydraulic oil change at 2000 hours to maintain system cleanliness. Flush and replace the coolant at the same interval to protect the engine and hydraulic cooler. Inspect the turbocharger and valve clearances at 1000 hours. Check the swing machinery oil and change it at 2000 hours. Evaluate the undercarriage wear at 2000 hours to determine if rollers, idlers, or sprockets require replacement.
Seasonal & Environment Servicing
In cold weather, ensure the DEF level is sufficient for Tier 4 operation. Check the coolant concentration for freeze protection. In dusty environments, clean the air filter more frequently and check the outer element at 250 hours. Clear debris from the radiator and oil cooler fins daily to prevent overheating. Inspect the fuel water separator daily and drain as needed. Grease all pivot points more often in abrasive conditions.
PC20MRX-1(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.
PC20MRX-1(S/N 10001-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Faulty crankshaft speed sensor, damaged wiring harness, or corroded connector at the sensor pin. | Inspect the sensor wiring and connector for damage or corrosion. Test sensor voltage at the pin connector. Replace the speed sensor if the circuit is intact but the signal is absent. |
| CA122 | Intake air pressure sensor high voltage | Intake air pressure sensor malfunction, shorted wiring, or actual over-boost condition. | Verify the intake air pressure sensor readings against a known good gauge. Check the sensor wiring for shorts to power. Inspect the air intake system for restrictions or turbocharger issues. |
| CA123 | Intake air pressure sensor low voltage | Intake air pressure sensor short to ground, open circuit, or severe airflow restriction. | Check for sensor short or open circuit in the wiring harness. Inspect the air filter and intake ducting for blockages that would cause low pressure readings. |
| CA441 | Battery voltage too low | Weak or discharged battery, faulty alternator, or loose/corroded battery cables. | Check battery terminal connections for tightness and corrosion. Test the battery charge state. Inspect the alternator output and voltage regulator. Replace the alternator or battery as needed. |
| CA442 | Battery voltage too high | Faulty voltage regulator, failing alternator, or loose alternator drive belt. | Inspect the alternator drive belt for tension and condition. Test the alternator output voltage. Replace the alternator or voltage regulator if the output exceeds specifications. |
| AA10NX | Air cleaner clogging | Clogged air filter element, restricted intake path, or faulty air filter restriction sensor. | Inspect the air filter element for dirt and debris. Replace the air filter if clogged. Check the air intake ducting for obstructions. Verify the air filter restriction sensor operation. |
| B@HANS | Hydraulic oil overheating | Low hydraulic oil level, clogged hydraulic oil cooler, failed cooling fan, or excessive system load. | Check the hydraulic oil level and top up if low. Inspect the hydraulic oil cooler fins for debris and clean them. Verify the cooling fan operation and drive mechanism. Check for internal hydraulic leaks causing excessive heat. |
| B@BCNS | Engine coolant overheating | Low coolant level, faulty thermostat, failed water pump, clogged radiator, or broken fan belt. | Check the engine coolant level and refill if necessary. Inspect the radiator and cooler cores for blockage. Verify the fan belt tension and condition. Check the thermostat operation and water pump for leaks. |
| E10 | Engine controller power failure | Blown fuse, faulty ECM power supply, broken ground wire, or damaged ECM. | Inspect the ECM power fuses and relays. Check the main power and ground connections to the Electronic Control Module (ECM). Verify voltage at the ECM connector. Replace the ECM if power and ground are correct but the fault persists. |
| E11 | Engine protection—output power reduced | High coolant temperature, low oil pressure, or excessive engine load triggering protection mode. | Check the engine coolant temperature and oil pressure gauges. Inspect the coolant level and oil level. Verify the air filter condition. Address any overheating or lubrication issues to restore full power. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
PC20MRX-1(S/N 10001-UP) attachments & work tools
Buckets
Factory specifications list a reference capacity of 0.1 cubic yards (0.1 cubic meters) with a maximum capacity of 0.2 cubic yards (0.2 cubic meters). The standard boom and stick configuration is 5 feet 71 inches (1809 mm) and 3 feet 37 inch (930 mm). Pin diameter and exact width are not documented for this specific serial range in the provided sources.
Hydraulic hammers
The machine operates with a hydraulic pump flow capacity of 15.8 gallons per minute (57 liters per minute) and a relief valve pressure of 2990 psi (206 bar). These parameters define the maximum hydraulic power available for breaker operation, but no specific hammer brand or weight class is verified for this model in the source text.
Quick couplers
The provided specifications and parts listings do not contain data regarding quick coupler types, pin sizes, or compatibility for the PC20MRX-1(S/N 10001-UP).
Thumbs/grapples
The provided specifications and parts listings do not contain data regarding thumb kits, grapples, or specific attachment mounting interfaces for the PC20MRX-1(S/N 10001-UP).
Rippers
The provided specifications and parts listings do not contain data regarding ripper attachments or mounting configurations for the PC20MRX-1(S/N 10001-UP).
Hydraulic-kit notes
The machine utilizes a Komatsu 3D74E engine producing 18 net horsepower (13 kW) and 20.1 gross horsepower (15.0 kW). The hydraulic system capacity is 5.6 gallons (21.2 liters) with a standard relief pressure of 2990 psi (206 bar). No specific high-flow or medium-pressure circuit modifications are documented for this serial range.
All PC20MRX-1(S/N 10001-UP) assemblies by section
Every catalogued assembly group for the Komatsu PC20MRX-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Front Hanger
| YM***00 | Hook,Front | 1 |
| YM***42 | Screw | 2 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Oil Filter
| YM***50 | Cartridge,Engine Oil | 1 |
| YM***40 | Stud | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : 3d74e-N3a Engine S/N 00102-Up : Rear Hanger
| YM***00 | Hook,Rear | 1 |
| YM***22 | Screw | 4 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Front Hanger
| YM***00 | Hook,Front | 1 |
| YM***42 | Screw | 2 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Oil Filter
| YM***50 | Cartridge,Engine Oil | 1 |
| YM***40 | Stud | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : 3d74e-N3ab Engine S/N 00102-Up : Rear Hanger
| YM***00 | Hook,Rear | 1 |
| YM***22 | Screw | 4 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Cooling System : Cooling (Radiator Piping)
| 07***19 | Clamp, Hose | 4 |
| 20***20 | Hose | 1 |
| 20***32 | Hose | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Electrical System : Wiring Harness (2/2)
| 01***12 | Screw,Sems | 2 |
| 01***16 | Screw | 3 |
| 01***20 | Screw, Machine | 2 |
Engine Related Parts
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Hydraulic System : Actuator Line (Boom And Arm Cylinder Hose)
| 22***11 | Hose | 4 |
| 22***21 | Hose | 2 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Hydraulic System : Actuator Line (Swivel Joint Hose? 2/2)
| 22***71 | Hose | 1 |
| 22***10 | Hose | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Hydraulic System : Additional Valve (1-Way)
| (7***0) | Valve Sub Ass'Y | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Hydraulic System : Delivery Line
| 07***08 | Plug,See Fig. K4010-63a0 | 1 |
| 22***10 | Hose | 1 |
| 22***20 | Hose | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Marks And Plates : Marks And Plates (Operating Plate) (English)
| 09***00 | Plate? Safety,Operating Pattern Table (Jis) | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Marks And Plates : Marks And Plates (With Cab) (Pictorial Plates)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***81 | Plate? Safety,Keep Out Of Turning Area | 1 |
| 09***81 | Plate? Safety,Keep Out Of Working Area | 2 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Marks And Plates : Marks And Plates (With Canopy) (Pictorial Plates)
| 04***60 | Screw,Machine Model (For Ec Reg.) | 4 |
| 09***81 | Plate? Safety,Keep Out Of Turning Area | 1 |
| 09***81 | Plate? Safety,Keep Out Of Working Area | 2 |
Operator'S Compartment And Control System
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Operator'S Compartment And Control System : Ashtray (For Cab)
| 21***20 | Ashtray | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Accumulator)
| 01***45 | Bolt,(With Water Separator Type) | 2 |
| 01***09 | Nut,(For Japan) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Main Valve Piping)
| 08***36 | Tie, Cable | 16 |
| 20***70 | Sheet | 6 |
| 21***10 | Band? Yellow | 2 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Operator'S Compartment And Control System : Main Control (Work Equipment Stand Cover)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***40 | Bolt (Op) | 6 |
| 01***16 | Washer,(For 35a Alternator) | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Operator'S Compartment And Control System : Seat Belt
| 01***25 | Bolt - Relay Mounting | 4 |
| 20***10 | Seat Belt Ass'Y,(Belt Width 2 Inch) | 1 |
| 20***11 | Seat Belt Ass'Y,(Belt Width 3 Inch) | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Arm Cylinder (Inner Parts)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***24 | Nut,Bearing | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : B00m Cylinder (Inner Parts)
| 01***22 | Nut,(North America Spec.) | 1 |
| 07***65 | O-Ring,(F5350-62a0 -14 ) | 2 |
| 07***70 | O-Ring (Kit) | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Blade Cylinder (Inner Parts)
| 01***22 | Nut,(North America Spec.) | 1 |
| 07***65 | O-Ring,Injection Pump Case | 1 |
| 07***60 | O-Ring,(F4350-59a0 -6 ) | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Bucket Cylinder (Inner Parts)
| 01***20 | Bolt,(For Mono Lever Steering) | 1 |
| 01***19 | Nut | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Hydraulic Pump (1/2) (Inner Parts)
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 3 |
| 04***12 | Ring, Snap (4) | 1 |
| 04***12 | Ring,Split, Ring-Snap | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Hydraulic Pump (2/2) (Inner Parts)
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
| 01***16 | Washer,(For 35a Alternator) | 2 |
| 04***12 | Pin,Spring (See Fig.0201) | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Main Valve (8-Valve) (3/10)(#10001-11327)
| (7***1) | Control Valve | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Swing Cylinder (Inner Parts)
| 01***24 | Nut,Bearing | 1 |
| 07***65 | O-Ring,(F5350-62a0 -14 ) | 1 |
| 07***70 | O-Ring (Kit) | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Swing Motor (1/3) (Inner Parts)
| 01***25 | Screw | 6 |
| 04***16 | Pin, Spring | 7 |
| 04***10 | Ring,Snap | 7 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Swing Motor (2/3) (Inner Parts)
| 04***12 | Pin,Spring (See Fig.0201) | 1 |
| 04***12 | Ring,Split, Ring-Snap | 1 |
| 06***01 | Bearing,Ball | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Swing Motor (3/3) (Inner Parts)
| 07***11 | O-Ring,(Tm8202-009) | 4 |
| 20***40 | Timer Valve Ass'Y,Brake | 1 |
| 20***70 | Plug | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Swivel Joint (Inner Parts)
| 01***16 | Bolt (Op) | 4 |
| 04***18 | Ring,Snap (With Emergency Steering) | 1 |
| 70***60 | Swivel Joint Ass'Y | 1 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Travel Motor (1/3) (Inner Parts)
| 04***12 | Pin, Spring | 3 |
| 04***12 | Ring, Snap | 3 |
| 04***12 | Ring, Retaining | 4 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Travel Motor (2/3) (Inner Parts)
| 06***01 | Bearing,Ball | 1 |
| 20***30 | Ring | 2 |
| 20***20 | O-Ring | 2 |
Komatsu : Pc20mrx-1(S/N 10001-Up) : Service Kit And Component Parts : Travel Motor (3/3) (Inner Parts)
| 20***60 | Ball,Steel | 2 |
| 20***40 | Bearing | 1 |
| 20***80 | Pin,Dowel | 1 |
Swing Circle And Related Parts
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Under Carriage : Carrier Plate
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 20***40 | Plate | 4 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Under Carriage : Track Frame
| 20***12 | Frame,Track | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Under Carriage : Track Shoe (Rubber Shoe)
| 20***01 | Shoe,Rubber | 2 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Work Equipment : Arm Cylinder
| (7***0) | Cylinder Group,Arm | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Work Equipment : Boom
| 07***35 | Seal,Dust (Kit) | 2 |
| 20***30 | Bushing | 2 |
| 22***00 | Boom Ass'Y | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(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 : Pc20mrx-1(S/N 10001-Up) : Work Equipment : Bucket Cylinder
| 20***30 | Band | 2 |
| (7***0) | Cylinder Group,Bucket | 1 |
Komatsu : Pc20mrx-1(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 : Pc20mrx-1(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 |
PC20MRX-1(S/N 10001-UP) serial number reference
The Product Identification Number (PIN) plate is riveted to the right-hand side of the cab on the lower frame, typically just behind the front idler or beneath the operator's window. Read the three-character prefix at the start of the 17-character ISO PIN (positions 4–6) to identify the configuration; for the PC20MRX-1 (S/N 10001-UP), the prefix is KUE.
| Prefix | Identifies | Notes |
|---|---|---|
| KUE | KUE Spec. | Identified in the Komatsu PC20MRX-1 Parts Catalog as the specific serial range S/N 10001-UP. This denotes the KUE (Korea/Europe/Export) specification variant. |
Frequently asked questions
What engine does the PC20MRX-1 use?
The PC20MRX-1 uses a Komatsu 3D74E engine with 18 HP (13 kW) net power and 20.1 HP (15.0 kW) gross power.
What is the operating weight of the PC20MRX-1?
The operating weight is 4830 lbs (2191 kg).
What model replaced the PC20MRX-1?
The PC20MRX-1 was succeeded by the PC20MR-2.
What PC20MRX-1(S/N 10001-UP) owners discuss
What engine powers the Komatsu PC20MRX-1(S/N 10001-UP) and what are its common powertrain behaviors?
The Komatsu PC20MRX-1(S/N 10001-UP) is powered by a Komatsu 4D94 engine. Common powertrain behaviors include a tendency to lose power under heavy digging loads if the air filter is dirty or fuel filters are clogged. Owners report that the engine may idle normally but struggle when combining boom, arm, and bucket movements, often indicating a restriction in the intake or fuel system rather than a mechanical failure. The engine is robust but sensitive to contamination and extended service intervals, which can accelerate injector wear and reduce efficiency. White smoke during cranking often points to a faulty primer pump or air in the fuel system, particularly after filter replacements. Have your dealer verify the exact engine code and emissions tier for your specific serial number, as regional packages vary by configuration/series.
What are the typical hydraulic system behaviors and failure modes for this machine?
The PC20MRX-1(S/N 10001-UP) uses a load-sensing hydraulic system. A common diagnostic pattern is that all hydraulic functions become slow simultaneously, which points to a shared cause such as low hydraulic oil level, clogged hydraulic filters, or incorrect oil specification (Komatsu EO or equivalent). If only one function (e.g., bucket) is slow while others work normally, the issue is likely isolated to the control valve spool, cylinder leakage, or pilot control input. Owners note that hydraulics may work well when cold but become weak when hot, indicating internal leakage in the pump, main control valve, or motors due to decreased oil viscosity. Hydraulic noise or cavitation often signals low oil level or suction-side restrictions. Have your dealer verify the correct hydraulic oil specification and pressure settings for your machine.
What undercarriage and wear patterns are typical for the PC20MRX-1(S/N 10001-UP)?
The PC20MRX-1(S/N 10001-UP) is a compact excavator with a track width of 250 mm and an operating weight ranging from approximately 2.140 to 2.610 metric tons (4,718 to 5,754 lb) depending on configuration. Typical wear patterns include rapid undercarriage wear in abrasive conditions, with flat spots developing on idlers and rollers if tracks are not properly tensioned. The track tensioner can fail, causing tracks to loosen repeatedly. Owners report that mud or debris packed into the undercarriage can cause pulling to one side during travel, which is often mistaken for a hydraulic issue. Final drives may develop noise due to oil contamination or low oil levels. Have your dealer verify the undercarriage component wear limits and track tension specifications for your specific configuration.
What are the common electrical and sensor issues reported for this model?
The PC20MRX-1(S/N 10001-UP) relies on electronic control systems, making it susceptible to issues from faulty sensors or unstable power supplies. Common electrical problems include intermittent starting, dashboard display failures, and random machine shutdowns. Multiple fault codes often point to battery issues, poor chassis grounds, or corroded connectors. Owners report that a battery may show acceptable voltage until the starter is loaded, so load testing is recommended before replacing the starter. Intermittent fault codes can also be caused by loose wiring harnesses or damaged connectors in the engine compartment. Have your dealer verify the battery state of charge and ground connections, and check for updated wiring harness specifications.
What should be checked when buying a used PC20MRX-1(S/N 10001-UP)?
When buying a used PC20MRX-1(S/N 10001-UP), check the following: 1) Engine starting and running condition, including white smoke on startup which may indicate primer pump or fuel system issues. 2) Hydraulic performance cold and hot, looking for weakness in all functions or specific circuits. 3) Undercarriage wear, track tension, and idler/roller condition for flat spots. 4) Electrical system, including battery health, ground connections, and dashboard functionality. 5) Cooling system, checking for debris between heat exchangers and coolant level. 6) Swing system for drift or weakness. 7) Travel function, testing both directions and checking for pulling to one side. Have your dealer verify the machine's exact serial number against factory specifications and perform a comprehensive pre-purchase inspection.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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