Komatsu PC1250-11, PC120LC-11, PC120SP-11 Hydraulic Excavator Operation and Maintenance Manual (TEN01016-06)
These PC1250-11 / PC120LC-11 / PC120SP-11 excavators usually live in hard digging—quarries, bulk earthmoving, loading trucks all day in dust, mud, and vibration. This operation and maintenance manual is what I’d keep on hand to plan routine services, walk around the machine in a logical inspection pattern, and keep it working instead of parked. For example, if the boom cycle starts slowing or the machine feels “lazy” under load, I’d use this book to verify daily checks, confirm filter and grease points, and rule out basic maintenance misses before calling in a bigger repair.
Applications & Use Cases
- Set up a maintenance rhythm so fuel, air, and hydraulic systems get attention before performance drops.
- Plan downtime around production, grouping services to avoid surprise stoppages.
- Trace early wear signs like uneven track wear, slow swing, or hot hydraulics using the recommended inspection flow.
- Verify correct adjustment and lubrication points after component replacement or hose work.
- Train new operators on proper warm-up, shutdown, and daily checks to keep the machine consistent between shifts.
FAQ
Q: Can I keep this manual on a tablet in the cab?
A: Yes, it’s well-suited to digital use; you can zoom diagrams and quickly search terms while you’re on site.
Q: Is it worth printing parts of it?
A: Many techs print the inspection checklists and service charts to hang in the workshop or carry in a clipboard.
Safety Note
Always follow the manual’s lockout, support, and pressure-release steps before inspecting or servicing any system.
📘 Show Index
Komatsu PC1250-11, PC120LC-11, PC120SP-11 Hydraulic Excavator Index:
- Cover
- Foreword
- Table of Contents
- Read This Manual
- Safety Information
- Introduction
- Main Use of Machine
- Directions of Machine
- Visibility from Operator’s Seat
- Engine Technology to Conform Exhaust Gas Emission
- Product Information
- Location of Product Identification Number (PIN) and Machine Serial No. Plate
- Location of Engine Number Plate
- Service Meter Location
- Your Machine Serial Numbers and Distributor
- Abbreviation List
- Safety
- Safety Labels
- Location of Safety Labels
- Safety Labels
- General Precautions Common to Operation and Maintenance
- Precautions Before You Start Operation
- Prepare for Safety Operation
- Precautions to Prevent Fire
- Precautions When You Get on or Off Machine
- Do Not Get Caught
- Precautions Related to Protective Structures
- Protection Against Objects Which Fall, Fly, or Enter
- Unauthorized Modification
- Precautions Related to Attachments and Options
- Quick Coupler Attachment
- Large Attachments and Combinations
- Precautions for CAB Glass
- Precautions When You Operate Engine Inside Building
- Precautions for Operation
- Precautions for Jobsite
- Start Engine
- Precautions for Operation
- Precautions for Transportation
- Towing and being Towed
- Lifting Operation by Bucket with Hook
- Precautions for Maintenance
- Precautions Before Inspection and Maintenance
- Precautions for Check and Maintenance
- Operation
- General View
- Names of Machine Equipment
- Names of Cab Devices
- Control Levers and Pedals
- Explanation of Components
- Machine Monitor Equipment
- Switches
- Control Levers and Pedals
- Other Equipment
- Machine Operations and Controls
- Checks and Adjustment Before You Start Engine
- How to Start Engine
- Operations and Checks After You Start Engine
- How to Stop Engine
- How to Start Machine (Travel FORWARD and REVERSE) and Stop Machine
- Steer Machine
- How to Swing Machine
- How to Operate Work Equipment
- Handle Working Mode
- Prohibited Operations
- Precautions for Operation
- Precautions When You Operate Machine on Slopes
- How to Escape from Mud
- Recommended Applications
- Effective Use of Hydraulic Excavator
- Replace Bucket
- How to Park Machine
- How to Examine After You Complete Work
- Lock
- Handle Air Conditioner
- Explanation of Air Conditioner Components
- Operate Air Conditioner
- Handle Radio
- Explanation of Radio Equipment
- Operate Radio
- Stow Antenna
- Handle KomVision
- Precautions When You Use KomVision
- Monitor Display
- Handle Anchor Point for Tie-off
- Transportation
- Precautions When You Transport Machine
- Select Transportation Method
- How to Lift Machine
- Precautions When You Load Machine
- Machine Configuration for Transportation
- Cold Weather Operation
- Cold Weather Operation Information
- Precautions After Daily Work Ends in Cold Weather
- After Cold Weather Season
- Precautions for Long-Term Storage
- Prepare for Long-Term Storage
- Maintenance During Long-Term Storage
- Start Machine After Long-Term Storage
- Troubles and Procedures
- Procedures When You Run Out of Fuel
- Phenomena that are Not Failures
- Precautions When You Tow Machine
- Precautions for Severe Work Condition
- Precautions for Discharged Battery
- Other Trouble
- Maintenance
- Precautions for Maintenance
- Examine Service Meter Reading
- Komatsu Genuine Replacement Parts
- Komatsu Genuine Lubricants
- Always Use Clean Washer Fluid
- Clean Lubricants
- Examine Drained Oil and Used Filter
- Precautions When You Refill Oil or Fuel
- Precautions for Welding
- Do Not Drop Things Inside Machine
- Precautions for KDPF
- Dusty Jobsites
- Avoid Mixing Oil
- Lock Inspection Covers
- Bleed Air from Hydraulic System
- Precautions When You Install Hydraulic Hoses
- Checks After Inspection and Maintenance
- Select Fuel and Lubricants by Ambient Temperature
- Outline of Maintenance
- Handle Oil, Fuel, Coolant, and Do Oil Clinic
- Handle Electrical Components
- Standard Tightening Torque for Bolts and Nuts
- Maintenance Schedule
- Maintenance Schedule Table
- Maintenance Interval When Diesel Fuel Mixed with Bio-Fuel is Used
- Maintenance Procedure
- Initial 100 Hours Maintenance (Only After the First 100 Hours)
- Initial 500 Hours Maintenance (Only After the First 500 Hours)
- When Required
- Examine Before You Start Operation
- Every 10 Hours Maintenance
- Every 100 Hours Maintenance
- Every 250 Hours Maintenance
- Every 500 Hours Maintenance
- Every 1000 Hours Maintenance
- Every 2000 Hours Maintenance
- Every 4000 Hours Maintenance
- Every 4500 Hours Maintenance
- Every 5000 Hours Maintenance
- Every 8000 Hours Maintenance
- Every 9000 Hours Maintenance
- Every 6 Months Maintenance
- Specifications
- Specifications
- Specifications: PC1250-11
- Specifications: PC1250SP-11
- Specifications: PC1250LC-11
- Attachments and Options
- Precautions When You Use Attachments and Options Safely
- Precautions When You Select
- Read the Operation and Maintenance Manual Thoroughly
- Precautions When You Remove and Install
- Precautions for Use
- Attachments and Options
- Install Attachment
- Track Shoes Selection
- Handle the Hydraulically Operated Stairway
- Procedure to Operate Hydraulic Type Stairway
- Procedures If Machine Does Not Move by Proximity Switch Failure Etc.
- How to Examine and Adjust Proximity Switch
- Procedures If Proximity Switch Has Failure
- Radio (Bluetooth®)
- Explanation of Radio Equipment
- Operate Radio
- Radio Setting
- Machine with Loading Shovel Specification
- Explanation of Components
- Switches
- Handle Anchor Point for Tie-off
- Machine Operations and Controls
- How to Operate Work Equipment
- Prohibited Operations
- Recommended Applications
- Digging Work
- Loading Work
- Precautions When You Disassemble Machine
- Transportation
- Machine Configuration for Transportation
- Consumable Parts
- Periodic Maintenance
- Examine Before You Start Operation
- How to Examine Oil Level in Hydraulic Tank, Add Oil
- Every 10 Hours Maintenance
- Every 5000 Hours Maintenance
- How to Change Oil in Hydraulic Tank, Clean Strainer
- Every 6 Months Maintenance
- How to Examine Anchor Point for Tie-off
- Specifications: PC1250-11
- Combination of Work Equipment
- Replacement Parts
- Defined Life Parts
- Consumable Parts
- Recommended Fuel, Coolant, and Lubricant
- Lubrication Chart
- How to Use Fuel, Coolant and Lubricants by Ambient Temperature
- Recommended Brands and Qualities Other Than Komatsu Genuine Oils
- INDEX
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