The Komatsu PC20E-6 Crawler Excavator is a small crawler machine you’ll see on tight jobsites doing trenching, backfilling, and light foundation work. People who reach for the Komatsu PC20E-6 Crawler Excavator Shop Manual (WENBM00520) are usually shop mechanics, field techs, or serious owner-operators. They’re trying to sort hydraulic issues, chase electrical faults, or rebuild major components without guessing. This isn’t an operator’s handbook; it’s the “fix it right in the workshop” book.
What this manual helps you do
- Trace hydraulic problems by following circuit layouts and step‑by‑step test procedures for the pumps, control valves, and travel motors.
- Diagnose engine and fuel system issues using the kind of checks, sequences, and adjustment procedures most shops rely on.
- Follow disassembly and reassembly sequences for major components like the swing system, undercarriage assemblies, and cylinders.
- Check and adjust control linkages, travel and swing functions, and work equipment so the machine runs smoothly after repairs.
- Handle scheduled workshop services with the right inspection points, adjustment steps, and standard workshop test methods.
Who this is for
This is aimed at field techs, shop mechanics, and fleet maintenance folks who already know their way around tools and safety. A new operator or someone just looking for daily checks and basic maintenance would be better off with the Operation & Maintenance manual instead of this shop manual.
FAQ
Q: Is this a PDF I can search and print?
A: Yes, it’s a PDF you can search on-screen and print pages you want to take out to the machine.
Q: Does it go deep enough for full overhauls?
A: These shop manuals usually cover diagnostic procedures, teardown/assembly sequences, and adjustment specs for workshop‑level repairs.
Q: How do I know it matches my exact PC20E-6?
A: Check your machine’s identification plate and match the model; if your tag says PC20E-6, this WENBM00520 shop manual is the one you’d normally use.
Bottom line: if you’re repairing or rebuilding a PC20E-6 in a workshop or service truck, this is the right manual; if you only need operating tips and simple maintenance, keep looking.
📘 Show Index
Table of Contents:
- 00 Index and Foreword
- Index
- Foreword, Safety, Basic Information
- How to Read the Shop Manual
- Safety Notice for Operation
- Precautions for High Voltage Parts
- Structure of High Voltage Parts
- Precautions When You Handle High Voltage Parts
- Precautions for Inspection and Maintenance of High Voltage Parts
- Precautions to Prevent Fire
- Procedures If Fire Occurs
- Precautions When You Dispose of Waste Materials
- Precautions When You Handle Hydraulic Equipment
- Precautions When You Disconnect and Connect Pipings
- Precautions When You Handle Electrical Equipment
- Precautions Against High Voltage and High Temperature
- Precautions When Machine Falls over and Power Electronics Components Have Damage
- Precautions for Machine Not to be Put in Water
- In Cold Weather
- Practical Use of KOMTRAX
- Disconnect and Connect Push-Pull Type Coupler
- How to Disconnect and Connect Type 1 Push-Pull Type Coupler
- How to Disconnect and Connect Type 2 Push-Pull Type Coupler
- How to Disconnect and Connect Type 3 Push-Pull Type Coupler
- Precautions for Disconnection and Connection of Connectors
- How to Disconnect and Connect Deutsch Connector
- How to Disconnect and Connect Slide Lock Type Connector
- How to Disconnect and Connect Connector with Lock to Pull
- How to Disconnect and Connect Connector with Lock to Push
- How to Disconnect and Connect Connector with Housing to Rotate
- Standard Tightening Torque Table
- Conversion Table
- Abbreviation List
- 01 Specifications
- Table of Contents
- Specifications
- Specification Drawing
- Working Range Drawings
- Specifications
- Weight Table
- Lubricants
- 10 Structure and Function
- Table of Contents
- Boot-up System
- Layout Drawing of Boot-up System
- System Operating Lamp System
- System Diagram of System Operating Lamp System
- Function of System Operating Lamp System
- Operation of System Operating Lamp System
- Battery Power Supply
- Function of Battery Power Supply
- Operation of Battery Power Supply
- Electric Motor Shutdown Secondary Switch
- ID Key System
- System Diagram of ID Key System
- Function of ID Key System
- Operation of ID Key System
- ID Key Controller
- ID Key Antenna
- Electric Drive System
- Layout Drawing of Electric Drive System
- Worker Protection System When You Disassemble Power Electronics Components
- High Voltage Wiring (Power Cable)
- Component Parts of Electric Drive System
- Battery Assembly
- Inverter
- Power Supply Controller
- MC2 Contactor
- Electric Motor
- Electric Motor System
- Layout Drawing of Electric Motor System
- Electric Motor Control System
- Operation of Electric Motor Control System
- Auto-Deceleration System
- System Diagram of Auto-Deceleration System
- Function of Auto-Deceleration System
- Operation of Auto-Deceleration System
- Overheat Prevention System
- Overheat Prevention System Diagram
- Function of Overheat Prevention System
- Automatic Idle Stop System
- System Diagram of Automatic Idle Stop System
- Function of Automatic Idle Stop System
- Operation of Automatic Idle Stop System
- Cooling System
- Control System
- Layout Drawing of Control System
- Machine Monitor System
- System Diagram of Machine Monitor System
- Function of Machine Monitor System
- KOMTRAX System
- System Diagram of KOMTRAX System
- Function of KOMTRAX System
- Component Parts of Control System
- Machine Monitor
- KOMTRAX Terminal
- Machine Controller
- Motor Speed Adjustment Dial
- Hydraulic System
- Layout Drawing of Hydraulic System
- Component Parts of Hydraulic System
- Hydraulic Tank
- Main Pump
- Control Valve
- Work Equipment System
- Layout Drawing of Work Equipment System
- Structure of Valve Control
- PPC Lock System
- System Diagram of PPC Lock
- Function of PPC Lock System
- Quick Coupler System
- System Drawing of Quick Coupler
- Operation of Quick Coupler System
- Component Parts of Work Equipment System
- Work Equipment and Swing PPC Valve
- Blade PPC Valve
- Boom Swing PPC Valve
- Bipartite Solenoid Valve
- Pilot Circuit Accumulator
- Swing System
- Layout Drawing of Swing System
- Component Parts of Swing System
- Travel System
- Layout Drawing of Travel System
- System Diagram of Travel Control System
- Component Parts of Travel System
- Travel Motor
- Travel PPC Valve
- Center Swivel Joint
- Undercarriage and Frame
- Layout Drawing of Undercarriage
- Specifications of Undercarriage
- Idler Cushion
- Structure of Idler Cushion
- Specifications of Idler Cushion
- Work Equipment
- Structure of Work Equipment
- Function of Work Equipment
- Work Equipment Clearance Adjustment Shim
- Function of Work Equipment Clearance Adjustment Shim
- CAB Related Parts
- ROPS Cab
- Structure of ROPS CAB
- Function of ROPS CAB
- 20 Standard Value Table
- Table of Contents
- Standard Value Table for Electric Motor
- Standard Value Table for Machine
- Machine Posture and Procedures to Measure Performance
- 30 Testing and Adjusting
- Table of Contents
- Precautions Before Work
- Related Information on Testing and Adjusting
- Differences In Machine Monitor Symbols
- Motor and Cooling System
- Examine Electric Motor Speed
- How to Examine Electric Motor High Idle Speed
- How to Examine Electric Motor Low Idle Speed
- How to Examine Electric Motor Speed at Pump Relief
- How to Examine Electric Motor Speed with Auto-Deceleration
- Electric Drive System
- Precautions for Electric Drive System
- Power Train
- Examine Swing Circle Bearing Clearance
- Undercarriage and Frame
- Examine and Adjust Track Tension
- How to Examine Track Tension
- How to Adjust Track Tension
- Hydraulic System
- Release Remained Pressure in Hydraulic Circuit
- How to Release Remained Pressure from Hydraulic Tank
- How to Release Remained Pressure in Hydraulic Cylinder Circuit
- How to Release Remained Pressure from Swing Motor Circuit
- How to Release Remained Pressure from Travel Motor Circuit
- Examine and Adjust Oil Pressure in Work Equipment, Travel, Boom Swing, and Blade Circuits
- How to Examine Oil Pressure in Work Equipment, Travel, Boom Swing, and Blade Circuits
- How to Adjust Oil Pressure in Work Equipment, Travel, and Boom Swing Circuits
- Examine and Adjust Swing Circuit Oil Pressure
- How to Examine Oil Pressure in Swing Circuit
- How to Adjust Oil Pressure in Swing Circuit
- Examine and Adjust Oil Pressure in PPC Solenoid Valve Circuit
- How to Examine Oil Pressure in PPC Solenoid Valve Circuit
- How to Adjust Oil Pressure in PPC Solenoid Valve Circuit
- How to Examine Oil Pressure of Travel Speed Increase Solenoid Valve
- How to Adjust Oil Pressure of Travel Speed Increase Solenoid Valve
- Examine PPC Valve Outlet Pressure
- How to Examine Outlet Pressure in PPC Valve
- Examine Travel Deviation
- How to Examine Travel Deviation
- Pressurize Hydraulic Tank
- Bleed Air from Hydraulic Circuit
- How to Bleed Air from Work Equipment Cylinder
- How to Bleed Air from Swing Motor
- How to Bleed Air from Travel Motor
- Electrical System
- Set and Operate Machine Monitor
- Operator Mode
- Function to Show Technician Identification Status Screen
- Examine Function by LCD (Liquid Crystal Display)
- Examine Function of Service Meter
- Usage Limitation and Maintenance Password Change Function
- Service Mode
- Pm Clinic
- 40 Troubleshooting
- Table of Contents
- Related Information for Troubleshooting
- General Troubleshooting Points
- Sequence of Events in Troubleshooting
- Inspection Procedure Before Troubleshooting
- Procedure for Troubleshooting
- Information Shown in Troubleshooting Table
- Connector Contact Connection Table
- T-Branch Box and T-Branch Adapter Table
- Failure Code Table
- Troubleshooting by Failure Code (Display of Code)
- Failure Code [989L00]
- Failure Code [989M00]
- Failure Code [989N00]
- Failure Code [B@HANS]
- Failure Code [D10DKB]
- Failure Code [D10DKY]
- Failure Code [D10EKB]
- Failure Code [D10EKY]
- Failure Code [D10FKA]
- Failure Code [D10FKB]
- Failure Code [D10FKY]
- Failure Code [D19JKZ]
- Failure Code [D19RKA]
- Failure Code [D19RKB]
- Failure Code [D19RKY]
- Failure Code [D19ZKA]
- Failure Code [D19ZKB]
- Failure Code [D19ZKZ]
- Failure Code [D1HBKA]
- Failure Code [D1HBKB]
- Failure Code [D1HBKY]
- Failure Code [D410ZC]
- Failure Code [D610KF]
- Failure Code [D6L1KA]
- Failure Code [D6L1KB]
- Failure Code [D6L2KA]
- Failure Code [D6L2KB]
- Failure Code [D6L3KB]
- Failure Code [D6L4KT]
- Failure Code [D6L5KE]
- Failure Code [D6L5KF]
- Failure Code [D6L5KR]
- Failure Code [D6L5KT]
- Failure Code [D6L5NR]
- Failure Code [D6L6ZC]
- Failure Code [D6L7ZC]
- Failure Code [D6L8KR]
- Failure Code [D6L9KR]
- Failure Code [D6LAKR]
- Failure Code [D6LPNS]
- Failure Code [D811MC]
- Failure Code [D862KA]
- Failure Code [D8ALKA]
- Failure Code [D8ALKB]
- Failure Code [D8AQKR]
- Failure Code [DAF0KT]
- Failure Code [DAF0MB]
- Failure Code [DAF0MC]
- Failure Code [DAF3KK]
- Failure Code [DAF9KQ]
- Failure Code [DAFGMC]
- Failure Code [DAFLKA]
- Failure Code [DAFLKB]
- Failure Code [DAFQKR]
- Failure Code [DBH0MC]
- Failure Code [DBH2KK]
- Failure Code [DBH2KT]
- Failure Code [DBH3KK]
- Failure Code [DBH5KP]
- Failure Code [DBH6KP]
- Failure Code [DBHKKA]
- Failure Code [DBHKKB]
- Failure Code [DBHKKY]
- Failure Code [DBHLKA]
- Failure Code [DBHLKB]
- Failure Code [DBHPKR]
- Failure Code [DBHQKR]
- Failure Code [DBHRKR]
- Failure Code [DBHUKR]
- Failure Code [DDNRKA]
- Failure Code [DDNRKY]
- Failure Code [DDNS00]
- Failure Code [DF40KZ]
- Failure Code [DGH2KA]
- Failure Code [DGH2KB]
- Failure Code [DHPAMA]
- Failure Code [DJK1KN]
- Failure Code [DJK1K4]
- Failure Code [DV00KB]
- Failure Code [DW43KA]
- Failure Code [DW43KB]
- Failure Code [DW43KY]
- Failure Code [F7FQKR]
- Failure Code [F7G0MC]
- Failure Code [GBB1K4]
- Failure Code [GBB1KH]
- Failure Code [GBB1L3]
- Failure Code [GBC3KA]
- Failure Code [GBC3KB]
- Failure Code [GBC3KY]
- Failure Code [GBCQMA]
- Failure Code [GBCYKA]
- Failure Code [GBP0MB]
- Failure Code [GBP0ZC]
- Failure Code [GF01K4]
- Failure Code [GF01KG]
- Failure Code [GF01KH]
- Failure Code [GF01KL]
- Failure Code [GF01KU]
- Failure Code [GF02KG]
- Failure Code [GF02KH]
- Failure Code [GF02KL]
- Failure Code [GF02KU]
- Failure Code [GF02N7]
- Failure Code [GF02N8]
- Failure Code [GF02NA]
- Failure Code [GF02NR]
- Failure Code [GF02NS]
- Failure Code [GF02NV]
- Failure Code [GF02R3]
- Failure Code [GF02ZS]
- Failure Code [GF02ZT]
- Failure Code [GF02ZU]
- Failure Code [GF10KN]
- Failure Code [GF11KG]
- Failure Code [GF11KK]
- Failure Code [GF12KA]
- Failure Code [GF13KA]
- Failure Code [GF14KA]
- Failure Code [GF15KQ]
- Failure Code [GF16KA]
- Failure Code [GF16KB]
- Failure Code [GF17MA]
- Failure Code [GF18KQ]
- Failure Code [GF1AMA]
- Failure Code [GF1BMA]
- Failure Code [GF1C00]
- Failure Code [GF1CNS]
- Failure Code [GF1EKT]
- Failure Code [GF1FMA]
- Failure Code [GF1JKA]
- Failure Code [GF1LKB]
- Failure Code [GF1MKB]
- Failure Code [GF1NKB]
- Failure Code [GF1QKR]
- Failure Code [GF30KB]
- Failure Code [GF31MA]
- Failure Code [GF3200]
- Failure Code [GF32NS]
- Failure Code [GF33MA]
- Failure Code [GFA0KK]
- Failure Code [GFA0KQ]
- Failure Code [GFAJKE]
- Failure Code [GFAJKN]
- Failure Code [GFAKKU]
- Failure Code [GFALNS]
- Failure Code [GFALZC]
- Failure Code [GFAMMN]
- Failure Code [GFAMNS]
- Failure Code [GFAUKB]
- Failure Code [GFATKB]
- Failure Code [GFBQKR]
- Failure Code [GFC0FG]
- Failure Code [GFC0KT]
- Failure Code [GFC0ZC]
- Failure Code [GFC0ZE]
- Failure Code [GFD6MA]
- Failure Code [GFDAKG]
- Failure Code [GFDAKN]
- Failure Code [GFDAKP]
- Failure Code [GFDAKY]
- Failure Code [GFDDKG]
- Failure Code [GFDDKN]
- Failure Code [GFDDKP]
- Failure Code [GFDEKN]
- Failure Code [GFDGKB]
- Failure Code [GFDGKG]
- Failure Code [GFDGKP]
- Failure Code [GFDKKB]
- Failure Code [GFDKKG]
- Failure Code [GFDKKN]
- Failure Code [GFDKKP]
- Failure Code [GFDKKY]
- Failure Code [GFDLKN]
- Failure Code [GFDNKG]
- Failure Code [GFDNKN]
- Failure Code [GFDNKP]
- Failure Code [GFDRKK]
- Failure Code [GFDRKU]
- Failure Code [GFDSKK]
- Failure Code [GFDSKU]
- Failure Code [GFDUN7]
- Failure Code [GFDUN8]
- Failure Code [GFDVN8]
- Failure Code [GFEAKA]
- Failure Code [GFEAKB]
- Failure Code [GFEBKB]
- Troubleshooting of Electrical System (E-Mode)
- Battery Pre-charge Operation Failure
- 50 Disassembly and Assembly
- Table of Contents
- Coating Materials List
- Precautions Before Work
- Procedure for Preparation of Maintenance of Components Under the Rear Covers
- Prepare for Residual Charge Check
- Measure Residual Voltage on the wiring harness frame side
- Procedure for Restoring the Machine after Maintenance of Components Under the Rear Covers
- Disconnect and Connect Battery Power Supply
- How to Disconnect Battery Power Supply
- How to Connect Battery Power Supply
- Tilt Travel Lever Support
- Drain and Add Hydraulic Oil
- How to Drain Hydraulic Oil
- How to Add Hydraulic Oil
- Cooling System
- Remove and Install Hydraulic Oil Cooler Assembly
- How to Remove Hydraulic Oil Cooler Assembly
- How to Install Hydraulic Oil Cooler Assembly
- Power Train
- Remove and Install Travel Motor Assembly
- How to Remove Travel Motor Assembly
- How to Install Travel Motor Assembly
- Remove and Install Swing Motor Assembly
- How to Remove Swing Motor Assembly
- How to Install Swing Motor Assembly
- Remove and Install Swing Circle Assembly
- How to Remove Swing Circle Assembly
- How to Install Swing Circle Assembly
- Undercarriage and Frame
- Remove and Install Track Assembly
- How to Remove Track Assembly
- How to Install Track Assembly
- Disassemble and Assemble Recoil Spring Assembly
- How to Disassemble Recoil Spring Assembly
- How to Assemble Recoil Spring Assembly
- Disassemble and Assemble Idler Assembly
- How to Disassemble Idler Assembly
- How to Assemble Idler Assembly
- Disassemble and Assemble Track Roller Assembly
- How to Disassemble Track Roller Assembly
- How to Assemble Track Roller Assembly
- Remove and Install Revolving Frame Assembly
- How to Remove Revolving Frame Assembly
- How to Install Revolving Frame Assembly
- Remove and Install Rear Covers
- How to Remove Rear Covers
- How to Install Rear Covers
- Hydraulic System
- Remove and Install Center Swivel Joint Assembly
- How to Remove Center Swivel Joint Assembly
- How to Install Center Swivel Joint Assembly
- Remove and Install Hydraulic Tank Assembly
- How to Remove Hydraulic Tank Assembly
- How to Install Hydraulic Tank Assembly
- Remove and Install Main Pump Assembly
- How to Remove Main Pump Assembly
- How to Install Main Pump Assembly
- Work Equipment
- Remove and Install Blade Assembly
- How to Remove Blade Assembly
- How to Install Blade Assembly
- Remove and Install Work Equipment Assembly
- How to Remove Work Equipment Assembly
- How to Install Work Equipment Assembly
- Disassemble and Assemble Work Equipment Cylinder Assembly
- How to Disassemble Work Equipment Cylinder Assembly
- How to Assemble Work Equipment Cylinder Assembly
- Cab Related Parts
- Remove and Install Cab Assembly
- How to Remove Cab Assembly
- How to Install Cab Assembly
- Remove and Install Operator's Seat
- How to Remove Operator's Seat
- How to Install Operator's Seat
- Remove and Install Seat Belt
- How to Remove Seat Belt
- How to Install Seatbelt
- Electrical System
- Remove and Install Battery Assembly
- How to Remove Battery Assembly
- How to Install Battery Assembly
- Remove and Install Charger Inlet Assembly
- How to Remove Charger Inlet Assembly
- How to Install Charger Inlet Assembly
- Remove and Install Electric Motor
- How to Remove Electric Motor
- How to Install Electric Motor
- Remove and Install Power Supply Controller
- How to Remove Power Supply Controller
- How to Install Power Supply Controller
- Remove and Install Contactor
- How to Remove Contactor
- How to Install Contactor
- Remove and Install Inverter
- How to Remove Inverter
- How to Install Inverter
- Remove and Install DC/DC Converters
- How to Remove DC/DC Converters
- How to Install DC/DC Converters
- Remove and Install Machine Controller
- How to Remove Machine Controller
- How to Install Machine Controller
- Remove and Install Machine Monitor Assembly
- How to Remove Machine Monitor Assembly
- How to Install Machine Monitor Assembly
- Remove and Install KOMTRAX Terminal Assembly
- How to Remove KOMTRAX Terminal Assembly
- How to Install KOMTRAX Terminal Assembly
- Remove and Install On-board Charger Assembly
- How to Remove On-board Charger Assembly
- How to Install On-board Charger Assembly
- 60 Maintenance Standard
- Table of Contents
- Explanation of Terms for Maintenance Standard
- Power Train
- Maintenance Standard for Swing Circle
- Maintenance Standard for Sprocket
- Undercarriage and Frame
- Maintenance Standard for Track Frame and Idler Cushion
- Maintenance Standard of Idler
- Maintenance Standard of Track Roller
- Maintenance Standard of Rubber Shoe
- Hydraulic System
- Maintenance Standard for Hydraulic Tank
- Maintenance Standard for Swing Motor
- Maintenance Standard of Travel Motor
- Maintenance Standard for Blade PPC Valve
- Maintenance Standard for Boom Swing PPC Valve
- Maintenance Standard for Center Swivel Joint
- Work Equipment
- Maintenance Standard for Work Equipment Linkage
- Dimensions of Bucket
- Maintenance Standard for Boom Cylinder
- Maintenance Standard for Arm Cylinder
- Maintenance Standard for Bucket Cylinder
- Maintenance Standard for Blade Cylinder
- Maintenance Standard for Boom Swing Cylinder
- Maintenance Standard for Variable Gauge Cylinder
- 90 Circuit Diagrams
- Table of Contents
- Read the Codes for Electric Cable
- Hydraulic Circuit Diagram
- Symbols Used in Hydraulic Circuit Diagram
- Hydraulic Circuit Diagram
- Electrical Circuit Diagram
- Symbols Used in Electric Circuit Diagram
- Electrical Circuit Diagram (1/6)
- Electrical Circuit Diagram (2/6)
- Electrical Circuit Diagram (3/6)
- Electrical Circuit Diagram (4/6)
- Electrical Circuit Diagram (5/6)
- Electrical Circuit Diagram (6/6)
- Index
Komatsu
