Komatsu PC75R-2 excavator, repair e-manual

Contents

Foreword

Safety

Structure, function and maintenance standard

• P.T.O
• Power train
• Track frame
• Idler and recoil spring
• Track roller
• Carrier roller
• Track shoe
• Swing circle
• Swing machinery
• Hydraulic circuit diagram (Standard)
• Hydraulic circuit diagram (2-Piece boom)
• Hydraulic pump
• 9-Spool control valve (Standard)
• 10-Spool control valve (Standard+2-Piece boom)
• Swing motor
• Center swivel joint
• Travel motor
• Parking brake
• Brake valve
• Travel motor
• Reduction gear
• Cylinders
• Servocontrol feed unit
• Accumulator
• PPC valve
• PPC valve (blade, boom swing, 2-piece boom)
• Travel PPC valve
• Boom and arm safety valve
• Blade safety valve
• 2-Piece boom safety valve
• Overload sensor switch
• Solenoid valve
• Electrical diagram

Testing and adjusting

• Normal or standard technical data
• Equipment for testing, adjusting, and identifying faults
• Measuring the engine speed
• Adjusting valve clearance
• Measuring compression pressure
• Testing and adjusting fuel injection timing
• Testing and adjusting fan belt tension
• Adjusting the stroke of the accelerator lever
• Adjusting PPC valves clearance
• Adjusting the safety microswitch
• Measuring the swing circle axial clearance
• Testing and adjusting track-shoe tension
• Air bleeding from hydraulic circuits
• Releasing residual pressure from the circuits
• Checking and regulating pressure in the hydraulic circuits
• Testing and setting of main valves
• Adjusting PC valve
• Measuring differential pressure and adjusting valve
• Checking and adjusting pressures in the servocontrol feed unit
• Measuring pumps delivery and flow control starting point pump
• Measuring travel deviation
• Adjusting the maximum speed of the travel motors
• Measuring inner oil leakage of travel motor
• Adjusting boom and arm safety valves
• Adjusting 2nd boom safety valves
• Measuring and setting of pressure switch signal overload operation
• Measurement of internal oil leakages in the swing motor
• Checking for leakages inside the swivel joint
• Analysis of the causes of hydraulic drifts

Removal and installation

• How to read the manual
• Precautions to be taken while working
• Special tools
• Starter motor
• Alternator
• Injection pump
• Nozzle holder
• Cylinder head
• Seat
• Cabin
• Engine hood
• Front hood
• Heating fan
• Radiator
• Hydraulic oil cooler
• Fuel tank
• Hydraulic oil tank
• Engine-pump group
• Pump group
• Engine-pump coupling joint
• Main pump input shaft oil seal
• Gear-pump
• Swivel joint
• Swing motor
• Swing machinery
• Control valve
• Revolving frame
• Counterweight
• Swing circle
• Track shoes
• Sprocket
• Travel motor
• Ball bearing preload
• Axial clearance on tapered roller
• Idler and recoil spring assembly
• Recoil spring group
• Track roller
• Carrier roller
• PPC valve (boom-bucket)
• PPC valve (arm-swing)
• Blade PPC valve
• Travel PPC valve
• Boom swing PPC valve
• Boom cylinder (1-piece boom)
• Boom cylinder (2-piece boom)
• 2-piece boom cylinder
• Arm cylinder
• Bucket cylinder
• Boom swing cylinder
• Blade cylinder
• Work equipment cylinder
• Work equipment (1-piece boom version)
• Work equipment (2-piece boom version)
• Bucket
• Arm
• 2-piece boom
• Boom (1-piece boom version)
• Boom (2-piece boom version)
• Swing support
• Blade

Maintenance standard

• P.T.O
• Swing circle
• Track frame
• Idler
• Carrier roller
• Track roller
• Track shoe
• Sprocket
• Swing machinery
• Hydraulic pump
• Control valve
• Swing motor
• Swivel joint
• Travel motor
• Servocontrol feed unit
• Travel PPC valve
• PPC valve
• Blade safety valve
• Cylinders
• Work equipment (1-piece boom)
• Work equipment (2-piece boom)

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