Komatsu PC228US-3 / PC228USLC-3 excavator, repair e-manual

Contents

Safety

Foreword

General

• Specification dimension drawings
• Specifications
• Weight table
• Fuel, coolant, and lubricants

Structure and function

• Engine related parts
• Radiator, oil cooler, aftercooler
• Power train
• Final drive
• Swing circle
• Swing machinery
• Track frame, recoil spring
• Track shoe
• Hydraulic tank
• Hydraulic pump
• Control valve
• CLSS
• Self pressure reducing valve
• Travel junction valve
• Boom hydraulic drift prevention valve
• Travel PPC shuttle valve
• Lift check valve
• Holding valve
• Swing motor
• Reverse prevention valve
• Center swivel joint
• Travel motor
• Valve control
• Work equipment, swing PPC valve
• Travel PPC valve
• Service PPC valve
• PPC accumulator
• Solenoid valve
• Hydraulic cylinder
• Work equipment
• Engine control
• Electronic control system
• Monitoring system
• Sensor

Testing and adjusting

• Tools for testing, adjusting, and troubleshooting
• Measuring engine speed
• Measuring exhaust gas color
• Adjusting valve clearance
• Measuring compression pressure
• Measuring blow-by pressure
• Testing and adjusting fuel injection timing
• Measuring engine oil pressure
• Testing and adjusting belt tension for air conditioner compressor
• Measuring speed sensor
• Testing and adjusting governor motor lever stroke
• Testing and adjusting hydraulic pressure in work equipment, swing, travel circuit
• Testing and adjusting PC valve output pressure (servo piston input pressure)
• Testing and adjusting LS valve output pressure (servo piston input pressure) and LS differential pressure
• Testing and adjusting control circuit oil pressure
• Measuring solenoid valve output pressure
• Measuring PPC valve output pressure
• Adjusting work equipment, swing PPC valve
• Testing travel deviation
• Testing locations causing hydraulic drift of work equipment
• Measuring swing, travel motor oil leakage
• Releasing remaining pressure in hydraulic circuit
• Testing clearance of swing circle bearing
• Testing wear of sprocket
• Testing and adjusting track shoe tension
• Bleeding air
• Procedure for replacing boom angle potentiometer
• Procedure for checking diode

Troubleshooting

Disassembly and assembly

• Method of using manual
• Precautions when carrying out operation
• Special tool lis
• Engine
• Engine seal
• Radiator
• Hydraulic oil cooler
• Aftercooler
• Fuel tank
• Center swivel joint
• Final drive, travel motor
• Swing motor and swing machinery
• Frame
• Swing circle
• Recoil spring
• Idler
• Track roller
• Track shoe
• Hydraulic tank
• Hydraulic pump
• Control valve
• Pump merge-divider valve/ self-pressure reducing valve/travel junction valve
• Work equipment PPC valve
• Travel PPC valve
• Operator’s cab
• Floor frame
• Air conditioner compressor
• Air conditioner unit
• Counterweight
• Monitor panel

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