








$25.00
Generation
2Language
EnglishModel of Truck
PC128US-2, PC138US-2, PC138USLC-2Region
JapanTruck Class
PC128, PC138Illustrated factory Workshop Manual for Komatsu Crawler Excavators Models PC128US-2, PC138US-2 and PC138USLC-2.
This manual will assist you in diagnosing, repairing, and adjusting for your crawler excavator.
You can use a Windows, Mac, or Android device to view this manual. You only need to have a PDF reader installed.
Covered Models (Japan):
PC128US-2 (SN: 5001-7730; 7731-)
PC138US-2 (SN: 4501-)
PC138USLC-2 (SN: 1001-)
Format: PDF, 1029 pages
Language: English
Table of Contents:
FOREWORD
GENERAL
HOW TO READ THE SHOP MANUAL
HOISTING INSTRUCTIONS
METHOD OF DISASSEMBLING, CONNECTING PUSH-PULL TYPE COUPLER
COATING MATERIALS
STANDARD TIGHTENING TORQUE
ELECTRIC WIRE CODE
CONVERSION TABLE
UNITS
GENERAL
GENERAL ASSEMBLY DRAWING
SPECIFICATIONS
WEIGHT TABLE
LIST OF LUBRICANTS AND WATER
STRUCTURE AND FUNCTION
PTO
RADIATOR AND OIL COOLER
POWER TRAIN
SWING CIRCLE
SWING MACHINERY
TRACK FRAME
IDLER CUSHION
HYDRAULIC COMPONENT LAYOUT
VALVE CONTROL
HYDRAULIC TANK AND FILTER
HYDRAULIC PUMP (PISTON PUMP)
CONTROL VALVE
SUCTION SAFETY VALVE
CLSS
SELF PRESSURE REDUCING VALVE
CENTER SWIVEL JOINT
TRAVEL MOTOR (FINAL DRIVE)
SWING MOTOR
SOLENOID VALVE
PPC ACCUMULATOR
ACCUMULATOR FOR BREAKER (OPT)
PPC VALVE
HYDRAULIC DRIFT PREVENTION VALVE
ARM HYDRAULIC DRIFT PREVENTION VALVE
AIR-CONDITIONER PIPING
ELECTRIC COMPONENT LAYOUT
ENGINE CONTROL
ELECTRIC CONTROL SYSTEM
MONITOR SYSTEM
TESTING AND ADJUSTING
STANDARD VALUE TABLE
TESTING AND ADJUSTING
TROUBLESHOOTING
DISASSEMBLY AND ASSEMBLY
METHOD OF USING MANUAL
PRECAUTIONS WHEN CARRYING OUT OPERATION
SPECIAL TOOL LIST
SKETCH OF SPECIAL TOOL
CYLINDER HEAD ASSEMBLY
INJECTION PUMP ASSEMBLY
ENGINE AND MAIN PUMP ASSEMBLY
RADIATOR, HYDRAULIC OIL COOLER
RADIATOR ASSEMBLY
HYDRAULIC OIL COOLER ASSEMBLY
AFTER COOLER ASSEMBLY
FUEL TANK
CENTER SWIVEL JOINT
SWING MOTOR, SWING MACHINERY
SWING MACHINERY
REVOLVING FRAME
SWING CIRCLE
TRAVEL MOTOR AND FINAL DRIVE ASSEMBLY
RECOIL SPRING
IDLER
TRACK ROLLER
TRACK SHOE
HYDRAULIC TANK
MAIN PUMP
CONTROL VALVE
LS SELECTION VALVE
PRESSURE COMPENSATION VALVE
MAIN RELIEF VALVE
WORK EQUIPMENT PPC VALVE (FOR BOOM, BUCKET, ARM, SWING CONTROL)
TRAVEL PPC VALVE
HYDRAULIC CYLINDER
WORK EQUIPMENT
OPERATOR`S CAB
OPERATOR’S CAB GLASS (STUCK GLASS)
FRONT WINDOW ASSEMBLY
FLOOR FRAME
AIR CONDITIONER COMPRESSOR
AIR CONDITIONER CONDENSOR
AIR CONDITIONER UNIT
COUNTERWEIGHT
MONITOR PANEL ASSEMBLY
CONTROLLER ASSEMBLY
MAINTENANCE STANDARD
SWING MACHINERY
SWING CIRCLE
TRACK FRAME, IDLER CUSHION
IDLER
CARRIER ROLLER
TRACK ROLLER
SPROCKET
TRACK SHOE
HYDRAULIC PUMP (PISTON PUMP)
CONTROL VALVE
SUCTION SAFETY VALVE
SELF PRESSURE REDUCTION VALVE
TRAVEL MOTOR
SWING MOTOR
SOLENOID VALVE
CENTER SWIVEL JOINT
PPC VALVE
BOOM HYDRAULIC DRIFT PREVENTION VALVE (FOR KUK SPEC)
ARM HYDRAULIC DRIFT PREVENTION VALVE (FOR KUK SPEC) (IF EQUIPPED)
HYDRAULIC CYLINDER
WORK EQUIPMENT
DIMENSION OF WORK EQUIPMENT
OTHERS
HYDRAULIC CIRCUIT DIAGRAM (ATTACHMENT)(BREAKER: 1 SERVICE VALVE: 50: AMOUNT)
HYDRAULIC CIRCUIT DIAGRAM (ATTACHMENT)(CRASHER: 1 SERVICE VALVE: 100% AMOUNT)
HYDRAULIC CIRCUIT DIAGRAM (ATTACHMENT) (CRASHER: 2 SERVICE VALVE: 100% AMOUNT)
ELECTRIC CIRCUIT DIAGRAM (AIR CONDITIONER) PC128US-2 (SERIAL NO.: 5001-7730)
ELECTRIC CIRCUIT DIAGRAM (AIR CONDITIONER) PC128US-2 (SERIAL NO.: 7731 AND UP) AND PC138USLC-2 (SERIAL NO.: 1001 AND UP)
HYDRAULIC CIRCUIT DIAGRAM PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM PC128US-2 (SERIAL NO.: 7731 AND UP) PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1001 AND UP)
HYDRAULIC CIRCUIT DIAGRAM (WITH 1 ACUTUATOR ATTACHEMENT PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM (WITH 1 ACTUATOR ATTACHMENT) PC128US-2 (SERIAL NO.: 7731 AND UP), PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1001 AND UP)
HYDRAULIC CIRCUIT DIAGRAM (WITH BLADE + 1 ACTUATOR ATTACHMENT) PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM (WITH BLADE + 1 ACTUATOR ATTACHMENT) PC128US-2 (SERIAL NO.: 7731 AND UP), PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1001 AND UP)
HYDRAULIC CIRCUIT DIAGRAM (FOR KUK SPEC.) PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM (FOR KUK SPEC.) PC128US-2 (SERIAL NO.: 7731 AND UP) & PC138US-2 (SERIAL NO.: 4501 AND UP)
HYDRAULIC CIRCUIT DIAGRAM (WITH 2 ACTUATOR ATTACHMENT) (FOR KUK SPEC.) PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM (WITH 2 ACTUATOR ATTACHMENT) (FOR KUK SPEC.) PC128US-2 (SERIALNO.: 7731 AND UP) & PC138US-2 (SERIAL NO.: 4501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (2/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 SERIAL NO.: 6301-7730)
ELECTRIC CIRCUIT DIAGRAM (2/2) PC128US-2 SERIAL NO.: 6301-7730)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 (SERIAL NO.: 7731-7874)
ELECTRIC CIRCUIT DIAGRAM (2/2) PC128US-2 (SERIAL NO.: 7731-7874)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 (SERIAL NO.: 7875 AND UP) & PC138USLC-2 (SERIAL NO.: 1001-1500)
ELECTRIC CIRCUIT DIAGRAM (2/2) PC128US-2 (SERIAL NO.: 7875 AND UP) PC138USLC-2 (SERIAL NO.: 1001-1500)
ELECTRIC CIRCUIT DIAGRAM (1/3) PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (2/3) PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (3/3) PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (1/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (2/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (1/2) PC128US-2 (SERIAL NO.: 6301-7730)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (2/2) PC128US-2 (SERIAL NO.: 6301-7730)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.)(1/2) PC128US-2 (SERIAL NO.: 7731 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (2/2) PC128US-2 (SERIAL NO.: 7731 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (1/3) PC138US-2 (SERIAL NO.: 4501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (2/3) PC138US-2 (SERIAL NO.: 4501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (3/3) PC138US-2 (SERIAL NO.: 4501 AND UP)
This manual will assist you in diagnosing, repairing, and adjusting for your crawler excavator.
You can use a Windows, Mac, or Android device to view this manual. You only need to have a PDF reader installed.
Covered Models (Japan):
PC128US-2 (SN: 5001-7730; 7731-)
PC138US-2 (SN: 4501-)
PC138USLC-2 (SN: 1001-)
Format: PDF, 1029 pages
Language: English
Table of Contents:
FOREWORD
GENERAL
HOW TO READ THE SHOP MANUAL
HOISTING INSTRUCTIONS
METHOD OF DISASSEMBLING, CONNECTING PUSH-PULL TYPE COUPLER
COATING MATERIALS
STANDARD TIGHTENING TORQUE
ELECTRIC WIRE CODE
CONVERSION TABLE
UNITS
GENERAL
GENERAL ASSEMBLY DRAWING
SPECIFICATIONS
WEIGHT TABLE
LIST OF LUBRICANTS AND WATER
STRUCTURE AND FUNCTION
PTO
RADIATOR AND OIL COOLER
POWER TRAIN
SWING CIRCLE
SWING MACHINERY
TRACK FRAME
IDLER CUSHION
HYDRAULIC COMPONENT LAYOUT
VALVE CONTROL
HYDRAULIC TANK AND FILTER
HYDRAULIC PUMP (PISTON PUMP)
CONTROL VALVE
SUCTION SAFETY VALVE
CLSS
SELF PRESSURE REDUCING VALVE
CENTER SWIVEL JOINT
TRAVEL MOTOR (FINAL DRIVE)
SWING MOTOR
SOLENOID VALVE
PPC ACCUMULATOR
ACCUMULATOR FOR BREAKER (OPT)
PPC VALVE
HYDRAULIC DRIFT PREVENTION VALVE
ARM HYDRAULIC DRIFT PREVENTION VALVE
AIR-CONDITIONER PIPING
ELECTRIC COMPONENT LAYOUT
ENGINE CONTROL
ELECTRIC CONTROL SYSTEM
MONITOR SYSTEM
TESTING AND ADJUSTING
STANDARD VALUE TABLE
TESTING AND ADJUSTING
TROUBLESHOOTING
DISASSEMBLY AND ASSEMBLY
METHOD OF USING MANUAL
PRECAUTIONS WHEN CARRYING OUT OPERATION
SPECIAL TOOL LIST
SKETCH OF SPECIAL TOOL
CYLINDER HEAD ASSEMBLY
INJECTION PUMP ASSEMBLY
ENGINE AND MAIN PUMP ASSEMBLY
RADIATOR, HYDRAULIC OIL COOLER
RADIATOR ASSEMBLY
HYDRAULIC OIL COOLER ASSEMBLY
AFTER COOLER ASSEMBLY
FUEL TANK
CENTER SWIVEL JOINT
SWING MOTOR, SWING MACHINERY
SWING MACHINERY
REVOLVING FRAME
SWING CIRCLE
TRAVEL MOTOR AND FINAL DRIVE ASSEMBLY
RECOIL SPRING
IDLER
TRACK ROLLER
TRACK SHOE
HYDRAULIC TANK
MAIN PUMP
CONTROL VALVE
LS SELECTION VALVE
PRESSURE COMPENSATION VALVE
MAIN RELIEF VALVE
WORK EQUIPMENT PPC VALVE (FOR BOOM, BUCKET, ARM, SWING CONTROL)
TRAVEL PPC VALVE
HYDRAULIC CYLINDER
WORK EQUIPMENT
OPERATOR`S CAB
OPERATOR’S CAB GLASS (STUCK GLASS)
FRONT WINDOW ASSEMBLY
FLOOR FRAME
AIR CONDITIONER COMPRESSOR
AIR CONDITIONER CONDENSOR
AIR CONDITIONER UNIT
COUNTERWEIGHT
MONITOR PANEL ASSEMBLY
CONTROLLER ASSEMBLY
MAINTENANCE STANDARD
SWING MACHINERY
SWING CIRCLE
TRACK FRAME, IDLER CUSHION
IDLER
CARRIER ROLLER
TRACK ROLLER
SPROCKET
TRACK SHOE
HYDRAULIC PUMP (PISTON PUMP)
CONTROL VALVE
SUCTION SAFETY VALVE
SELF PRESSURE REDUCTION VALVE
TRAVEL MOTOR
SWING MOTOR
SOLENOID VALVE
CENTER SWIVEL JOINT
PPC VALVE
BOOM HYDRAULIC DRIFT PREVENTION VALVE (FOR KUK SPEC)
ARM HYDRAULIC DRIFT PREVENTION VALVE (FOR KUK SPEC) (IF EQUIPPED)
HYDRAULIC CYLINDER
WORK EQUIPMENT
DIMENSION OF WORK EQUIPMENT
OTHERS
HYDRAULIC CIRCUIT DIAGRAM (ATTACHMENT)(BREAKER: 1 SERVICE VALVE: 50: AMOUNT)
HYDRAULIC CIRCUIT DIAGRAM (ATTACHMENT)(CRASHER: 1 SERVICE VALVE: 100% AMOUNT)
HYDRAULIC CIRCUIT DIAGRAM (ATTACHMENT) (CRASHER: 2 SERVICE VALVE: 100% AMOUNT)
ELECTRIC CIRCUIT DIAGRAM (AIR CONDITIONER) PC128US-2 (SERIAL NO.: 5001-7730)
ELECTRIC CIRCUIT DIAGRAM (AIR CONDITIONER) PC128US-2 (SERIAL NO.: 7731 AND UP) AND PC138USLC-2 (SERIAL NO.: 1001 AND UP)
HYDRAULIC CIRCUIT DIAGRAM PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM PC128US-2 (SERIAL NO.: 7731 AND UP) PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1001 AND UP)
HYDRAULIC CIRCUIT DIAGRAM (WITH 1 ACUTUATOR ATTACHEMENT PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM (WITH 1 ACTUATOR ATTACHMENT) PC128US-2 (SERIAL NO.: 7731 AND UP), PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1001 AND UP)
HYDRAULIC CIRCUIT DIAGRAM (WITH BLADE + 1 ACTUATOR ATTACHMENT) PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM (WITH BLADE + 1 ACTUATOR ATTACHMENT) PC128US-2 (SERIAL NO.: 7731 AND UP), PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1001 AND UP)
HYDRAULIC CIRCUIT DIAGRAM (FOR KUK SPEC.) PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM (FOR KUK SPEC.) PC128US-2 (SERIAL NO.: 7731 AND UP) & PC138US-2 (SERIAL NO.: 4501 AND UP)
HYDRAULIC CIRCUIT DIAGRAM (WITH 2 ACTUATOR ATTACHMENT) (FOR KUK SPEC.) PC128US-2 (SERIAL NO.: 5001-7730)
HYDRAULIC CIRCUIT DIAGRAM (WITH 2 ACTUATOR ATTACHMENT) (FOR KUK SPEC.) PC128US-2 (SERIALNO.: 7731 AND UP) & PC138US-2 (SERIAL NO.: 4501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (2/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 SERIAL NO.: 6301-7730)
ELECTRIC CIRCUIT DIAGRAM (2/2) PC128US-2 SERIAL NO.: 6301-7730)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 (SERIAL NO.: 7731-7874)
ELECTRIC CIRCUIT DIAGRAM (2/2) PC128US-2 (SERIAL NO.: 7731-7874)
ELECTRIC CIRCUIT DIAGRAM (1/2) PC128US-2 (SERIAL NO.: 7875 AND UP) & PC138USLC-2 (SERIAL NO.: 1001-1500)
ELECTRIC CIRCUIT DIAGRAM (2/2) PC128US-2 (SERIAL NO.: 7875 AND UP) PC138USLC-2 (SERIAL NO.: 1001-1500)
ELECTRIC CIRCUIT DIAGRAM (1/3) PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (2/3) PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (3/3) PC138US-2 (SERIAL NO.: 4501 AND UP) & PC138USLC-2 (SERIAL NO.: 1501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (1/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (2/2) PC128US-2 (SERIAL NO.: 5001-6300)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (1/2) PC128US-2 (SERIAL NO.: 6301-7730)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (2/2) PC128US-2 (SERIAL NO.: 6301-7730)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.)(1/2) PC128US-2 (SERIAL NO.: 7731 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (2/2) PC128US-2 (SERIAL NO.: 7731 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (1/3) PC138US-2 (SERIAL NO.: 4501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (2/3) PC138US-2 (SERIAL NO.: 4501 AND UP)
ELECTRIC CIRCUIT DIAGRAM (FOR KUK SPEC.) (3/3) PC138US-2 (SERIAL NO.: 4501 AND UP)
General
Generation
2Language
EnglishModel of Truck
PC128US-2, PC138US-2, PC138USLC-2Region
JapanTruck Class
PC128, PC138Type of Document
Workshop ManualType of Truck
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