Komatsu PC300LC-5 Hydraulic Excavator Operation and Maintenance Manual (CEAD207040)
On a PC300LC-5 that spends its life digging foundations, loading trucks, or trenching in rough sites, this Operation and Maintenance Manual is what you use to keep the machine predictable day after day. It walks you through how to run the excavator correctly and how to stay on top of routine checks so you don’t find problems only when something breaks. If, for example, the boom feels sluggish at the start of a shift, this is the book you grab to verify basic settings, confirm daily inspection points, and rule out simple operator or maintenance issues before calling in major repairs.
Applications & Use Cases
- Set up a preventive maintenance rhythm so filters, oils, and wear items are checked before they become downtime.
- Plan inspections around your workload, adjusting checks for harsh conditions like rock, mud, or long travel days.
- Trace early signs of wear—unusual noises, heat, or slow functions—back to likely causes you can inspect on-site.
- Verify safe operating practices for new operators so they don’t abuse the swing, undercarriage, or hydraulics.
- Prepare parts orders by confirming what needs service at the next shutdown, instead of guessing at the last minute.
FAQ
Q: Can I keep this manual on a tablet in the cab?
A: Yes, it’s practical to use digitally; you can zoom diagrams and search terms, just keep the device protected from dust and vibration.
Q: Is it worth printing sections of this manual?
A: Many mechanics print the key maintenance pages and keep them in a binder or job box to avoid handling electronics with greasy hands.
Safety Note
Always follow the manual’s safety instructions and lock-out procedures before inspecting or servicing any part of the excavator.
Komatsu PC300LC-5 Hydraulic Excavator Index:
- MAIN MENU
- COVER PAGE
- 1. FORWARD
- 2. SAFETY INFORMATION
- 3. INTRODUCTION
- 4. LOCATION OF PLATES, TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
- 5. CONTENTS
- SAFETY
- 6. GENERAL PRECAUTIONS
- 7. PRECAUTIONS DURING OPERATION
- 7.1 BEFORE STARTING ENGINE
- 7.2 OPERATING MACHINE
- 7.3 TRANSPORTATION
- 7.4 BATTERY
- 7.5 TOWING
- 7.6 BUCKET WITH HOOK
- 8. PRECAUTIONS FOR MAINTENANCE
- 8.1 BEFORE CARRYING OUT MAINTENANCE
- 8.2 DURING MAINTENANCE
- 9. POSITION FOR ATTACHING SAFETY LABELS
- OPERATION
- 10. GENERAL VIEW
- 10.1 GENERAL VIEW OF MACHINE
- 10.2 GENERAL VIEW OF CONTROLS AND GAUGES
- 11. EXPLANATION OF COMPONENTS
- 11.1 ELECTRONIC MONITOR AND CONTROL CONSOLE (EMACC)
- 11.2 METER
- 11.3 SWITCHES
- 11.4 CONTROL LEVERS, PEDALS
- 11.5 CEILING WINDOW
- 11.6 WINDSHIELD
- 11.7 DOOR HOLD OPEN LOCK
- 11.8 CAP, COVER WITH LOCK
- 11.9 DEFROSTER CONTROL
- 11.10 STORAGE TRAY
- 11.11 ASHTRAY
- 11.12 FUSE
- 11.13 FUSIBLE LINK
- 11.14 HANDLING ACCUMULATOR
- 12. OPERATION
- 12.1 CHECK BEFORE STARTING
- 12.2 STARTING ENGINE
- 12.3 OPERATIONS AND CHECKS AFTER STARTING ENGINE
- 12.4 MOVING MACHINE OFF
- 12.5 STEERING THE MACHINE
- 12.6 STOPPING THE MACHINE
- 12.7 SWINGING
- 12.8 OPERATION OF WORK EQUIPMENT
- 12.9 WORKING MODE SELECTION
- 12.10 PROHIBITIONS FOR OPERATION
- 12.11 PRECAUTIONS FOR OPERATION
- 12.12 PRECAUTIONS WHEN TRAVELING UP OR DOWN HILLS
- 12.13 HOW TO ESCAPE FROM MUD
- 12.14 WORK POSSIBLE USING HYDRAULIC EXCAVATOR
- 12.15 REPLACEMENT AND INVERSION OF BUCKET
- 12.16 PARKING MACHINE
- 12.17 CHECK AFTER FINISHING WORK
- 12.18 STOPPING ENGINE
- 12.19 CHECK AFTER STOPPING ENGINE
- 12.20 LOCKING AND SECURING MACHINE
- 13. TRANSPORTATION
- 13.1 LOADING AND UNLOADING MACHINE
- 13.2 TRANSPORTING MACHINE
- 13.3 PRECAUTIONS FOR TRANSPORTATION
- 13.4 DISASSEMBLING MACHINE FOR TRANSPORT
- 14. COLD WEATHER OPERATION
- 14.1 PRECAUTIONS FOR LOW TEMPERATURE
- 14.2 PRECAUTIONS AFTER COMPLETION OF WORK
- 14.3 AFTER COLD WEATHER
- 15. LONG-TERM STORAGE
- 15.1 BEFORE STORAGE
- 15.2 DURING STORAGE
- 15.3 AFTER STORAGE
- 15.4 STARTING MACHINE AFTER LONG-TERM STORAGE
- 16. TROUBLESHOOTING
- 16.1 MOVING A DISABLED MACHINE
- 16.2 PRECAUTIONS ON PARTICULAR JOBSITES
- 16.3 IF BATTERY IS DISCHARGED
- 16.4 STARTING ENGINE WITH BOOSTER CABLE
- 16.5 OTHER TROUBLE
- 16.6 PHENOMENA THAT ARE NOT FAILURES
- MAINTENANCE
- 17. GUIDES TO MAINTENANCE
- 18. OUTLINES OF SERVICE
- 18.1 OUTLINE OF OIL, FUEL, COOLANT
- 18.2 OUTLINE OF ELECTRICAL SYSTEM
- 18.3 OUTLINE OF HYDRAULIC SYSTEM
- 19. WEAR PARTS LIST
- 20. USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE
- 20.1 PROPER SELECTION OF FUEL, COOLANT AND LUBRICANTS
- 20.2 ENGINE OIL SPECIFICATIONS
- 20.3 GREASE SPECIFICATIONS
- 20.4 DIESEL FUEL SPECIFICATIONS
- 20.5 COOLANT SPECIFICATIONS
- 21. STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
- 21.1 STANDARD TIGHTENING TORQUE OF BOLTS AND NUTS
- 21.2 TIGHTENING TORQUE OF SPLIT FLANGE BOLTS
- 21.3 TIGHTENING TORQUE FOR NUTS OF FLARED FITTINGS
- 21.4 UNIT CONVERSIONS
- 22. PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
- 23. MAINTENANCE SCHEDULE CHART
- 24. SERVICE PROCEDURE
- 24.1 SEASONAL PREPARATIONS
- 24.2 AIR CLEANING SYSTEM
- 24.3 AIR CONDITIONER
- 24.4 BELTS
- 24.5 BUCKET
- 24.6 COOLING SYSTEM
- 24.7 ELECTRICAL SYSTEM
- 24.8 ENGINE
- 24.9 ETHER INJECTOR (IF EQUIPPED)
- 24.10 FINAL DRIVE
- 24.11 FUEL SYSTEM
- 24.12 HYDRAULIC SYSTEM
- 24.13 LUBRICATION FITTINGS
- 24.14 PTO CASE
- 24.15 SEAT BELT
- 24.16 SWING MACHINERY
- 24.17 TRACKS
- 24.18 TURBOCHARGER
- 24.19 WALK AROUND INSPECTION
- 24.20 WINDOW WASHER
- SPECIFICATIONS
- OPTIONS & ATTACHMENTS
- 26. GENERAL PRECAUTIONS
- 26.1 PRECAUTIONS RELATED TO SAFETY
- 26.2 PRECAUTIONS WHEN INSTALLING ATTACHMENTS
- 27. HANDLING BUCKET WITH HOOK
- 27.1 CHECK FOR DAMAGE TO BUCKET WITH HOOK
- 27.2 PROHIBITED OPERATIONS
- 27.3 PRECAUTIONS DURING OPERATIONS
- 28. OPERATING AIR CONDITIONER
- 28.1 CONTROL PANEL
- 28.2 COOLING
- 28.3 HEATING
- 28.4 DEHUMIDIFY AND HEATING
- 29. RADIO
- 29.1 OPERATION
- 29.2 CARE AND MAINTENANCE
- 29.3 TROUBLESHOOTING
- 30. OPTIONAL ELECTRICAL EQUIPMENT
- 30.1 INSTALLATION OF OPTIONAL ELECTRICAL EQUIPMENT
- 30.2 INSTALLATION OF ADDITIONAL LAMPS
- 31. INTRODUCTION OF ATTACHMENTS
- 31.1 BUCKET SELECTION
- 31.2 BUCKET TEETH SELECTION
- 31.3 BUCKET INSTALLATION COMBINATIONS
- 31.4 SELECTION OF TRACK SHOES
- 31.5 USING THE EXTENSION ARM
- 31.6 HANDLING THE CLAMSHELL BUCKET
- 32. EXTENDING MACHINE SERVICE LIFE
- 32.1 HYDRAULIC BREAKER
- 32.2 CRUSHER
- 32.3 GRAPPLE
- 32.4 BUCKET WITH THUMB GRAPPLE
- 32.5 ROTATING GRAPPLE
- 32.6 SHEAR
- 32.7 HYDRAULIC PILE DRIVER
- 32.8 HYDRAULIC EXCAVATOR WITH MULTI-PURPOSE CRANE
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