Komatsu PC128US-2 Hydraulic Excavator Operation and Maintenance Manual (SEAD035400)
On a PC128US-2 that spends its life in tight urban sites, roadwork, or utility trenches, this Operation and Maintenance Manual is what I’d keep handy to keep the machine earning without surprises. It helps you set a solid service rhythm, know what to look at and when, and operate it in a way that doesn’t beat up the hydraulics or slew system. If, for example, the swing starts feeling lazy or the boom gets jerky, this is the book I’d use to trace basic causes, verify daily checks were done right, and decide whether it’s a simple inspection item or needs shop time.
Applications & Use Cases
- Plan daily, weekly, and seasonal checks so you catch leaks, loose hardware, and play in pins before they sideline the machine.
- Trace early signs of hydraulic issues by following the recommended inspection order instead of guessing.
- Align operator habits with proper warm‑up, shutdown, and travel procedures to reduce wear.
- Schedule filter and component inspections around your job calendar to minimize downtime.
- Train new operators on correct control use and cab checks so they don’t create avoidable faults.
FAQ
Q: Can I keep this manual on a tablet in the cab?
A: Yes, just make sure it’s saved offline and bookmarked so you can search quickly without a data connection.
Q: Is it worth printing certain pages?
A: I’d print the inspection checklists and service-interval pages, laminate them, and hang them in the site office or service truck.
Safety Note
Always lock out, support, and relieve system pressure exactly as described before inspecting or servicing the excavator.
📘 Show Index
Komatsu PC128US-2 Hydraulic Excavator Index:
- MAIN MENU
- COVER
- 1. FOREWORD
- 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 AFTER STARTING ENGINE
- 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
- 9.1 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 MACHINE MONITOR
- 11.2 SWITCHES
- 11.3 CONTROL LEVERS, PEDALS
- 11.4 CEILING WINDOW
- 11.5 FRONT WINDOW
- 11.6 SLIDING DOOR
- 11.7 REAR WINDOW
- 11.8 HAMMER FOR EMERGENCY ESCAPE
- 11.9 CAP, COVER WITH LOCK
- 11.10 ENGINE HOOD
- 11.11 CAB REAR COVER
- 11.12 PUMP ROOM DOOR, BATTERY ROOM DOOR
- 11.13 DOOR AT FRONT OF TOOL BOX
- 11.14 FUSE
- 11.15 FUSIBLE LINK
- 11.16 POWER SOURCE FOR OPTION
- 11.17 CONTROLLER
- 11.18 HANDLING AIR CONDITIONER
- 11.19 CAR RADIO
- 11.20 TOOL COMPARTMENT
- 11.21 GREASE GUN HOLDER
- 11.22 ASHTRAY
- 11.23 HANDLING ACCUMULATOR
- 11.24 OPERATION AND MAINTENANCE MANUAL HOLDER
- 12. OPERATION
- 12.1 CHECK BEFORE STARTING ENGINE
- 12.2 STARTING ENGINE
- 12.3 OPERATIONS AND CHECKS AFTER STARTING ENGINE
- 12.4 MOVING MACHINE OFF
- 12.5 STEERING MACHINE
- 12.6 STOPPING MACHINE
- 12.7 SWINGING
- 12.8 OPERATION OF WORK EQUIPMENT
- 12.9 PROHIBITIONS FOR OPERATION
- 12.10 PRECAUTIONS FOR OPERATION
- 12.11 PRECAUTIONS WHEN TRAVELING UP OR DOWN HILLS
- 12.12 HOW TO ESCAPE FROM MUD
- 12.13 WORK POSSIBLE USING HYDRAULIC EXCAVATOR
- 12.14 REPLACEMENT AND INVERSION OF BUCKET
- 12.15 PARKING MACHINE
- 12.16 CHECK AFTER FINISHING WORK
- 12.17 STOPPING ENGINE
- 12.18 CHECK AFTER STOPPING ENGINE
- 12.19 LOCKING
- 12.20 HANDLING ROAD LINER
- 13. TRANSPORTATION
- 13.1 TRANSPORTATION PROCEDURE
- 13.2 LOADING, UNLOADING WORK WITH TRAILERS
- 13.3 METHOD OF LIFTING MACHINE
- 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 AFTER RUNNING OUT OF FUEL
- 16.2 PHENOMENA THAT ARE NOT FAILURES
- 16.3 METHOD OF TOWING MACHINE
- 16.4 USING METHOD FOR LIGHT-WEIGHT TOWING HOLE
- 16.5 PRECAUTIONS ON PARTICULAR JOBSITES
- 16.6 IF BATTERY IS DISCHARGED
- 16.7 OTHER TROUBLE
- MAINTENANCE
- 17. GUIDES TO MAINTENANCE
- 18. OUTLINES OF SERVICE
- 18.1 OUTLINE OF OIL, FUEL, COOLANT
- 18.2 OUTLINE OF ELECTRIC SYSTEM
- 18.3 OUTLINE OF HYDRAULIC SYSTEM
- 19. WEAR PARTS LIST
- 20. USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE
- 21. STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
- 22. PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
- 23. MAINTENANCE SCHEDULE CHART
- 23.1 MAINTENANCE SCHEDULE CHART
- 23.2 MAINTENANCE INTERVAL WHEN USING HYDRAULIC BREAKER
- 24. SERVICE PROCEDURE
- 24.1 INITIAL 250 HOURS SERVICE
- 24.2 WHEN REQUIRED
- 24.3 CHECK BEFORE STARTING
- 24.4 EVERY 50 HOURS SERVICE
- 24.5 EVERY 100 HOURS SERVICE
- 24.6 EVERY 250 HOURS SERVICE
- 24.7 EVERY 500 HOURS SERVICE
- 24.8 EVERY 1000 HOURS SERVICE
- 24.9 EVERY 2000 HOURS SERVICE
- 24.10 EVERY 4000 HOURS SERVICE
- 24.11 EVERY 5000 HOURS SERVICE
- 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 CHECKING FOR DAMAGE TO BUCKET WITH HOOK
- 27.2 PROHIBITED OPERATIONS
- 27.3 PRECAUTIONS DURING OPERATIONS
- 28. HANDLING CAR HEATER
- 28.1 EXPLANATION OF COMPONENTS
- 28.2 PREPARING CAR HEATER
- 29. MACHINES READY FOR ATTACHMENTS
- 29.1 EXPLANATION OF COMPONENTS
- 29.2 HYDRAULIC CIRCUIT
- 29.3 ATTACHMENT MOUNTING/DISMOUNTING PROCEDURE
- 29.4 OPERATION
- 29.5 LONG-TERM STORAGE
- 29.6 SPECIFICATIONS
- 30. INTRODUCTION OF ATTACHMENTS
- 30.1 SPECIFICATION, USE
- 30.2 ATTACHMENT INSTALLATION COMBINATION TABLE
- 31. EXTENDING MACHINE SERVICE LIFE
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