Hitachi Ex2500 Excavator Technical Workshop Manual SECTION 1GENERAL IMFORMATIONGroup 1 Precautions for Disassemblyand AssemblyPrecautions for Disassembly andAssembly W1-1-1Group 2 TighteningTightening Torque Specification W1-2-1Torque Chart W1-2-2Piping Joint W1-2-5SECTION 2UPPERSTRUCTUREGroup 1 CabWindowpane Dimensions W2-1-1Group 2 Pump DeviceRemove and InstallPump Device W2-2-1Pump Device Line ConnectionW2-2-3Disassemble Main PumpW2-2-4Assemble Main PumpW2-2-10Maintenance StandardsW2-2-13Disassemble Regulator W2-2-14Assemble Regulator W2-2-20Disassemble and Assemble4-Unit Pump W2-2-27Disassemble Fan Drive Pump W2-2-28Assemble Fan Drive Pump W2-2-32Maintenance StandardsW2-2-34Disassemble Regulator W2-2-36Assemble Regulator W2-2-40Disassemble and Assemble CompressorDrive Pump Pilot PumpW2-2-42Disassemble and Assemble TransmissionOil Cooling PumpW2-2-44Group 3 Control ValveRemove and InstallControl Valve W2-3-1Pilot Line Port Location W2-3-3Main Hydraulic Line Port Location W2-3-4Disassemble and AssembleControl Valve W2-3-5Group 4 Swing DeviceRemove and Install Swing DeviceW2-4-1Disassemble Swing DeviceW2-4-2Assemble Swing Device W2-4-6Disassemble Swing Motor W2-4-12Assemble Swing Motor W2-4-14Maintenance StandardW2-4-16Disassemble and AssembleRelief Block W2-4-17Group 5 Pilot ValveRemove and Install Front/SwingPilot ValveW2-5-1Remove and Install Travel and BucketOpen/Close Pilot Valves W2-5-3Pilot Valve Ports W2-5-5Disassemble and AssemblePilot ValveW2-5-6Group 6 Pilot Shut-Off ValveRemove and InstallShut-Off Valve W2-6-1Disassemble Pilot Shut-Off Valve W2-6-2Assemble Pilot Shut-Off Valve W2-6-4SECTION 3UNDERCARRIAGEGroup 1 Travel DeviceRemove and InstallTravel Device W3-1-1Disassemble TravelReduction Gear W3-1-4Assemble TravelReduction Gear W3-1-8Disassemble Travel Motor W3-1-12Assemble Travel Motor W3-1-16Disassemble and AssembleTravel Speed Mode Shift Valve W3-1-20Maintenance Standard W3-1-22Remove and InstallTravel Brake Valve W3-1-24Disassemble and AssembleTravel Brake Valve W3-1-25Group 2 Drive TumblerRemove and InstallDrive Tumbler W3-2-1Disassemble Drive Tumbler W3-2-2Assemble Drive Tumbler W3-2-4Maintenance Standards W3-2-8Group 3 Center JointRemove and Install Center Joint W3-3-1Disassemble and AssembleCenter Joint W3-3-4Group 4 Adjuster CylinderRemove and InstallAdjuster Cylinder W3-4-1Disassemble Adjuster Cylinder W3-4-2Assemble Adjuster Cylinder W3-4-4Group 5 Front IdlerRemove and InstallFront Idler W3-5-1Disassemble and AssembleFront Idler W3-5-4Maintenance Standards W3-5-6Group 6 Upper/Lower RollersRemove and InstallUpper/Lower Rollers W3-6-1Disassemble and AssembleUpper Roller W3-6-2Disassemble and AssembleLower Roller W3-6-4Maintenance Standards W3-6-6Group 7 Track ShoesDisassemble and AssembleTrack Shoes W3-7-1Maintenance Standards W3-7-2Group 8 AccumulatorRemove and Install Accumulator W3-8-1Disassemble Accumulator W3-8-4Assemble Accumulator W3-8-6Maintenance W3-8-10Group 9 Welding Repair ProcedureWelding Repair Procedures W3-9-1Welding Rod Specifications W3-9-2SECTION 4FRONT ATTACHMENTGroup 1 CylinderRemove and installCylinders and Preparation W4-1-1Disassemble and AssembleCylinders W4-1-22Air Bleeding ProcedureW4-1-36Maintenance Standard W4-1-37Group 2 Bushing and PointRemove and Install Bushings W4-2-1Maintenance StandardsW4-2-2