Komatsu PC50UU-2 excavator, repair e-manual

Contents

Safety

Foreword

General

• General assembly drawing
• Weight table
• List of lubricants and coolant

Structure and function

• Power train system
• PTO
• Swing machinery
• Swing circle
• Track frame
• Hydraulic piping diagram
• Hydraulic tank
• Main pump
• 5-spool control valve
• 6-spool control valve
• 4-spool control valve
• Swing motor
• Center swivel joint
• Travel motor
• Valve control
• PPC valve
• Solenoid valve, EPC valve Work equipment. Electric wiring diagram
• Four system (4 system)
• Machine monitor system
• Fuel control (one-touch deceleration system)

Testing and adjusting

• Table of judgement standard value
• Standard value table for electrical parts
• Tools for testing, adjusting, and troubleshooting
• Measuring oil leakage inside cylinder
• Measuring engine speed
• Measuring oil leakage from swing, travel motor
• Measuring engine oil pressure
• Measuring compression
• Adjusting valve clearance
• Releasing remaining from hydraulic circuit
• Adjusting the fuel injection timing
• Testing and adjusting alternator fan belt tension
• Adjusting blade control lever
• Adjusting travel control lever
• Adjusting fuel control lever
• Procedure for resetting electrical system input/output signals and checking operation
• Adjusting the fuel control linkage
• Testing and adjusting track shoe tension
• Measuring outlet port pressure of solenoid valve, EPC valve
• Testing travel deviation
• Testing wear of sprocket
• Procedure for adjustment when installing long arm or slide arm
• Procedure for replacing potentiometer
• Procedure for checking diode
• Measuring output pressure of PPC valve
• Adjusting PPC valve
• Troubleshooting

Disassembly and assembly

• Special tool
• Revolving frame
• Counterweight
• Starting motor
• Sprocket
• Alternator
• Idler
• Water pump
• Recoil spring
• Nozzle holder
• Carrier roller
• Cylinder head
• Track roller
• Damper
• Radiator and hydraulic oil cooler
• Rubber shoe
• Hydraulic oil cooler
• Steel shoe
• Engine
• Main pump
• Swing circle
• PPC pump
• Swing machinery and swing motor
• 4-spool control valve
• Swing motor and swing machinery
• Main relief valve for 4-spool control valve
• Swing motor
• 5-spool control valve
• Bucket
• Main relief valve for 5-spool control valve
• Work equipment
• Left work equipment PPC valve
• Blade
• Right work equipment PPC valve
• Operator's cab
• Work equipment PPC valve
• Floor frame
• Offset PPC valve
• Fuel tank
• Swing motor
• Controller
• Travel motor
• Monior
• Center swivel joint
• Boom cylindr
• Arm cylinder
• Bucket cylinder
• Offset cylinder
• Blade
• Hydraulic cylinder
• 1-st boom
• 2-nd boom
• Bucket and arm
• Arm

Maintenance standard

• Swing machinery
• Swing circle
• Track frame, recoil spring
• Idler
• Track roller
• Carrier roller
• Sprocket
• Track shoe
• Hydraulic pump
• 5-spool control valve
• 6-spool control valve
• 4-spool control valve
• Swing motor
• Center swivel joint
• PPC valve
• Hydraulic cylinder
• Work equipment

Others

• Hydraulic circuit diagram
• Electric circuit diagram

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