The PC300LC-8 or PC300HD-8 is parked with the boom down and a code on the monitor. A crew stands around waiting on trucks that aren't getting loaded. This Komatsu Shop Manual CEBM018703 (August 2011) covers PC300LC-8 serial A90001 and up and PC300HD-8 serial A87001 and up, both with the SAA6D114E-3 engine.
The book follows Komatsu's layout: general and specifications, structure and function, standard value tables, testing and adjusting, then troubleshooting by failure code, E-mode electrical and H-mode hydraulic checks. It covers CLSS valve operation, the HPV125+125 pump, the final drive, swing machinery and the undercarriage. The H-mode checks give you real numbers to test against, like main relief at 340 - 375 kg/cm2 (4,836 - 5,333 psi) with arm IN.
The disassembly chapters carry the torques and component weights. Fold-out hydraulic and electrical circuit diagrams finish the book. Track the fault down, fix it and get the bucket back in the dirt.
What's Inside This Komatsu PC300LC-8, PC300HD-8 Manual
| System | Pages | Key Topics |
|---|---|---|
| Front Matter, Safety and General Service Data | 1-32 | Revised Pages, Safety, How to Read the Shop Manual, Hoisting Instructions, Push Pull Coupler, Coating Materials, Standard Tightening Torque, Electric Wire Code, Conversion Tables |
| General: Specifications | 33-42 | Specification Dimension Drawings, Specifications for PC300LC-8 and PC300HD-8, SAA6D114E-3 Engine Data, Weight Table, Fuel, Coolant and Lubricants |
| Engine, Cooling System and Power Train | 43-61 | Engine Related Parts, Radiator, Oil Cooler and Aftercooler, Power Train, Final Drive, Sprocket, Swing Machinery, Swing Circle |
| Undercarriage and Frame | 62-81 | Track Frame and Recoil Spring, Idler, Carrier Roller, Track Roller, Track Shoe, Triple Grouser Shoe |
| Hydraulic System: Tank, Pump and Control Valve | 82-119 | Hydraulic Equipment Layout Drawing, Hydraulic Tank and Filter, HPV125+125 Hydraulic Pump, Control Valve |
| Hydraulic System: CLSS and Valve Functions | 120-170 | CLSS Closed Center Load Sensing System, Valve Functions and Operation |
| Hydraulic System: Valve Control and Cylinders | 171-239 | Valve Control, PPC Valves, Solenoid Valves, Hydraulic Cylinder |
| Work Equipment and Electrical System | 240-256 | Work Equipment, Air Conditioner Piping, Engine Control, Sensors |
| Electronic Control System | 257-284 | System Diagram, Engine and Pump Control, Pump and Valve Control, Power Maximizing and Machine Push-Up, Auto-Deceleration, Auto-Warm-Up and Overheat Prevention, Swing and Travel Control, Attachment Flow Control |
| Monitor System and Komtrax | 285-316 | Machine Monitor, Komtrax Communication Modem TH300 |
| Standard Value Tables | 317-326 | Engine Related Standard Values (Engine Speeds, Boost Pressure, Valve Clearance, Compression, Blow-By, Oil Pressure), Chassis Related Standard Values (Hydraulic Pressures, Swing, Travel, Work Equipment) |
| Testing and Adjusting: Engine and Hydraulic Pressures | 327-391 | Chassis Service Tools, Engine Tests, Belt Tension, Swing Circle Bearings, Track Shoe Tension, Work Equipment, Swing and Travel Oil Pressure, Pump PC and LS Pressure, Solenoid and PPC Valve Output Pressure, Hydraulic Drift, Releasing Pressure, Bleeding Air, Diode Inspection |
| Testing and Adjusting: Machine Monitor Special Functions | 392-466 | Machine Monitor Service Menu, Abnormality Record and Reset, Handling Voltage Circuit of Engine Controller, Preparation for Electrical Troubleshooting, Testing Diodes, PM Clinic Service |
| Troubleshooting: Failure Codes Table and Fuse Locations | 467-477 | Failure Codes Table with Action Codes, Device in Charge, Fuse Locations |
| Troubleshooting: General Information | 478-538 | Points to Remember, Sequence of Events, Handling Electric Equipment and Hydraulic Components, Connectors for Tier 3 Engines, Checks Before Troubleshooting, Connector Pin Number Tables, T-Adapter Table |
| Troubleshooting by Failure Code | 539-737 | Troubleshooting of Each Displayed Failure Code, Including Engine Controller CA Codes |
| Troubleshooting: E-Mode (Electrical System) | 738-797 | E-1 Engine Does Not Start Through E-31 Horn Does Not Sound: Auto-Decelerator, Preheater, Power Max, Machine Monitor Display, Gauges, Wiper, Komtrax, Air Conditioner, Travel Alarm |
| Troubleshooting: H-Mode (Hydraulic and Mechanical) | 798-826 | H-1 All Work Equipment Lacks Power Through H-27: Engine Stall, Boom, Arm and Bucket Slow, Hydraulic Drift, Time Lag, Travel Swerve and Slow Travel, Swing Acceleration and Overrun |
| Disassembly and Assembly: Tools, Engine Components and Cooling | 827-884 | How to Read, Special Tools List and Sketches, Connector Repair, Engine Components, Radiator, Hydraulic Oil Cooler, Aftercooler, Engine and Hydraulic Pump |
| Disassembly and Assembly: Undercarriage, Swing and Hydraulic Components | 885-962 | Final Drive, Swing Motor and Machinery, Swing Circle, Rollers, Idler, Recoil Spring, Sprocket, Track Shoe, Revolving Frame, Counterweight, Center Swivel Joint, Hydraulic Tank, Control Valve, Hydraulic Pump, PPC Valves, Hydraulic Cylinder, Work Equipment |
| Disassembly and Assembly: Cab and Electrical System | 963-1002 | Operator Cab, Electrical System Components |
| Air Conditioner | 1003-1088 | Components, Refrigerating Cycle, Air Conditioner Unit, Compressor, Condenser, Testing with Self-Diagnosis, Troubleshooting Charts, E Mode, Gauge Pressure, Compressor Oil, Desiccant Replacement |
| Diagrams and Drawings | 1089-1097 | Hydraulic Circuit Diagram, Electrical Circuit Diagram-, Electrical Connector Arrangement Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine | SAA6D114E-3, 6 - 114 x 135 mm, 8.27 L {8,270 cc} | p. 37 |
| Flywheel horsepower | 183.9/1,980 kW/rpm {250/1,980 HP/rpm} | p. 37 |
| Max. torque | 1,108/1,450 Nm/rpm {113/1,450 kgm/rpm} | p. 37 |
| Operating weight | PC300LC-8 32,830 kg; PC300HD-8 36,736 kg | p. 36 |
| Bucket capacity | 1.4 m³ | p. 36 |
| Travel speed (Hi) | PC300LC-8 5.5 km/h; PC300HD-8 4.9 km/h | p. 36 |
| Hydraulic pump | HPV125+125, 267.5 x 2 L/min, set pressure 37.8 MPa {380 kg/cm²} | p. 37 |
| Hydraulic system oil (specified / refill) | 365 L / 188 L | p. 41 |
| Engine oil pan (specified / refill) | 40 L / 35 L | p. 41 |
| High idling / low idling | 2,050 ±50 rpm / 1,000 ±25 rpm | p. 318 |
| Valve clearance (intake / exhaust) | 0.305 mm / 0.559 mm | p. 318 |
| Unload pressure | 39.7 ±10.1 kg/cm² (565 ±144 psi) | p. 320 |
| Track shoe tension clearance | 10 - 30 mm (0.4 - 1.2 in) | p. 362 |
