Komatsu PC1250-8 / PC1250SP-8 / PC1250LC-8 excavator, repair e-manual (in Russian)

Contents

Alphabetical index

• Components of the shop manual
• Contents

Preface and general information

• Safety notice
• How to use this shop manual
• Explanation of terms for maintenance standards
• Handling electrical equipment and hydraulic components
• Handling new connectors used for engines
• Electrical wire code designation
• Operation precautions
• Disassembling and connecting the push-type coupling
• Standard torque table tightening
• Conversion table

Specifications and technical data

• Backhoe version for front shovel version machines
• Technical data
• Weight table
• Fuel, coolant, and lubricant table

Engine and cooling system

• Power take-off
• Power take-off lubrication system
• Radiator and oil cooler

Power train

• Power train
• Swing gearbox
• Swing circle
• Final drive
• Sprocket

Undercarriage and frame

• Track frame, tension spring
• Idler
• Carrier roller
• Track roller
• Track shoe

Air system

• Pneumatic line drawing
• Pneumatic schematic diagram
• Air regulator
• Receiver
• Relief valve
• Horn valve
• Grease injector

Hydraulic system

• Hydraulic system diagram
• Hydraulic tank
• Hydraulic pump
• In-line oil filter
• Pilot circuit oil filter
• Return circuit oil filter
• Oil drain filter
• Radiator fan pump
• Radiator fan motor
• Control valve
• Swing motor
• Central pivot joint
• Travel motor
• PPC unloader control valve
• Hydraulic accumulator
• Valve control
• PPC valve
• Solenoid valve
• Hydraulic cylinder

Working equipment

• Working equipment
• Working equipment dimensions

Cabin and accessories

• Air conditioner

Electrical equipment

• Engine management
• Electronic control System
• Monitoring system
• Sensors

Table of standard operating values

• Table of standard values ​​for engine components
• Table of standard values ​​for chassis components
• List special tools for testing, adjusting, and diagnosing faults
• Special tool drawing
• Checking engine speed
• Checking air supply pressure (boost pressure)
• Checking exhaust gas temperature
• Checking exhaust gas color
• Checking and adjusting valve clearance
• Checking compression pressure
• Checking blowby pressure
• Checking engine oil pressure
• Checking oil pressure in the EGR valve and bypass valve actuator
• Adjusting the engine speed sensor
• Handling fuel system components
• Relieving residual pressure from the fuel system
• Checking fuel pressure
• Checking the return flow rate fuel and leaks
• Bleeding air from the fuel circuit
• Checking the fuel system for leaks
• Alternator inspection and belt replacement procedure
• Checking the swing circle bearing clearance
• Checking sprocket wear
• Checking and adjusting track chain tension
• Checking and adjusting hydraulic pressure in the work equipment, platform rotation, and travel circuits
• Checking and adjusting oil pressure in the pilot circuit
• Checking and adjusting piston pump pilot pressure
• Checking servo piston stroke
• Measuring the PPC valve outlet pressure and checking the shuttle swing control valve
• Measuring solenoid valve output oil pressure
• Travel deviation check
• Checking work equipment hydraulic drift points
• Measuring oil leaks
• Measuring fan speed
• Measuring fan circuit oil pressure
• Measuring fan pump EPC solenoid valve output pressure
• Bleeding air
• Relieving residual pressure in the hydraulic circuit
• Diode test procedure
• Special functions of the monitoring system unit
• Handling the controller voltage circuit
• Initial VHMS (vehicle health monitoring system) controller setup procedure
• Replacement precautions VHMS controller
• Preventive maintenance function

Fault code table and fuse locations

• Fault code table
• Fuse locations

General troubleshooting information

• Things to remember when troubleshooting
• Troubleshooting sequence
• Checks to perform before troubleshooting
• Troubleshooting classification and procedure
• Information contained in the troubleshooting table
• Connector pin number table
• Tee and T-connector housing table

Troubleshooting by trouble code (code display)

• Trouble code
• Information contained in the troubleshooting table
• Troubleshooting hydraulic and mechanical systems

General information on disassembly and assembly

• How to use this manual
• List of coating materials
• List of special tools
• Special tool drawings

Engine and cooling system

• Removing and installing the fuel pump
• Removing and installing the cylinder head
• Removing and installing the fuel injector
• Removing and installing the front engine seal
• Removing and installing the rear engine seal
• Removing and installing the engine, power take-off, and hydraulic pump
• Removing and installing the radiator and hydraulic oil cooler
• Removing the aftercooler
• Removing and installing the fuel cooler and air conditioning condenser
• Removing and installing the fan motor
• Removing and installing the fuel tank

Powertrain

• Removing and installing the power take-off
• Disassembling and assembling the power take-off
• Removing and installing the turntable
• Removing and installing the hydraulic motor Platform Swing and Platform Swing Gearbox
• Disassembling and assembling the platform swing gearbox
• Disassembling and assembling the platform swing hydraulic motor and platform swing gearbox
• Removing and installing the turntable
• Disassembling and assembling the final drive

Undercarriage and frame

• Removing and installing the track chain
• Disassembling and assembling one link in the field
• Removing and installing the guide wheel
• Disassembling and assembling the guide wheel adjustment cylinder
• Removing and installing the tension spring
• Disassembling and assembling the tension springs
• Removing and installing the track roller
• Disassembling and assembling the track roller
• Removing and installing the carrier roller
• Disassembling and assembling the carrier roller
• Removing and installing the pivot frame
• Removing and installing the counterweight

Hydraulic system

• Removing and installing the hydraulic tank
• Removing and installing the hydraulic pump
• Removing and installing the main pump input shaft oil seal
• Removing and installing the 5-spool control valve
• Removing and installing the 4-spool control valve
• Disassembling and Assembly of the control valve
• Removal and installation of the platform swing motor
• Removal and installation of the central swivel joint
• Disassembly and assembly of the central swivel joint
• Removal and installation of the travel motor
• Disassembly and assembly of the PPC valve of the working equipment
• Disassembly and assembly of the PPC control valve
• Disassembling and assembling the hydraulic cylinder

Working equipment

• Removing and installing the bucket cylinder
• Removing and installing the bottom dump cylinder
• Removing and installing the stick cylinder
• Removing and installing the boom cylinder
• Removing and installing the bucket
• Removing and installing the stick
• Removing and installing the boom

Cabin and its accessories

• Removing and installing the operator's cab
• Removing and installing the operator's cab glass
• Removing and installing the front windows

Electrical Equipment

• Removing and installing the air conditioning unit
• Removing and installing the monitoring system unit
• Removing and installing the pump controller
• Removing and installing the orbcomm machine health monitoring system (VHMS) terminal assembly
• Removing and installing the machine health monitoring system (VHMS) controller
• Removing and installing the engine controller

Hydraulic schematics

Connector layout diagram

Customers reviews