Part of the Hitachi Repair Manuals.
All 878 pages of this Hitachi EX150LC-5, EX160LC-5 Technical Manual PDF focus on one job: putting your hydraulic excavator back to factory spec. You get complete electrical circuit diagrams with cab, engine, and relay harness layouts, hydraulic schematics for the main and pilot circuits, and Dr.EX fault code tables that turn a blinking monitor into an actual diagnosis. Inside: a full troubleshooting section that walks engine, swing, travel, and front attachment problems from symptom to failed part, plus torque charts and step-by-step teardown procedures for every major component. Set the main relief valve to 34.3 MPa and confirm main pump flow at 126 L/min before you condemn the pump. No more chasing wiring faults with a multimeter and a prayer. Bookmarked with a live text layer; search any spec, jump straight to your system, and get back on the sticks.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Electrical Circuit Diagrams | 1-10 | Electrical Circuit Diagram, Connectors, Cab Harness, Engine Harness, Relay Harness, A/C Harness, Hydraulic Circuit Diagram |
| Safety | 11-36 | Recognize Safety Information, Understand Signal Words, Follow Safety Instructions, Prepare for Emergencies, Wear Protective Clothing, Protect Against Noise, Inspect Machine |
| General | 37-52 | Specification |
| System | 53-88 | Control System, Hydraulic System |
| Component Operation | 89-160 | Pump Device, Swing Device, Control Valve, Pilot Valve, Travel Device, Others |
| Operational Performance Test | 161-214 | Introduction, Engine Test, Excavator Test, Component Test |
| Troubleshooting | 215-383 | Diagnosing Procedure, Component Layout, Troubleshooting a, Troubleshooting B, Troubleshooting C, Electrical System Inspection |
| General Information | 384-397 | Tightening Torque (Bleeding Air From Hydraulic System, Floating Seal Precautions, Maintenance Standard Terminology, Specifications, Torque Chart, Service Recommendations for Split Flange, Nut and Bolt Lockings, Piping Joint, O-Ring Seal Joint, Screwed-In Connection, Seal Tape Application, Low-Pressure-Hose Clamp Tightening Torque, Connecting Hose) |
| Upperstructure | 398-549 | Cab, Counterweight, Main Frame, Pump Device, Control Valve, Swing Device, Pilot Valve, Pilot Shut-Off Valve |
| Undercarriage | 550-641 | Swing Bearing, Travel Device, Center Joint, Track Adjuster, Front Idler, Upper and Lower Roller |
| Front Attachment | 642-671 | Cylinder, Maintenance Standard, Standard Dimensions for Arm and Bucket Connection |
| Engine and Accessory | 672-878 | Maintenance, Engine Assembly 1, Engine Assembly 2, Engine Assembly 3, Lubricating System, Cooling System, Fuel System, Turbocharger |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main pump max. flow | 126 L/min | p. 44 |
| Pilot pump max. flow | 23.0 L/min | p. 44 |
| Main relief pressure | 34.3 MPa | p. 44 |
| Overload relief pressure (Boom raise/lower, Arm roll-in, Bucket roll-in) | 37.3 MPa | p. 44 |
| Injection pressure | 18.1 MPa | p. 42 |
| Nozzle opening pressure | 17.2 MPa (175 kgf/cm2) | p. 213 |
| Engine oil level indicator troubleshooting | Lower than 8 mm below LOW level | p. 320 |
| Operating Weight | 15000 kg | p. 39 |
| Engine Rated Output | 74 kW | p. 39 |
| Overload Relief Pressure (Arm roll-out, Bucket roll-out) | 39.2 MPa | p. 44 |
| Swing Relief Pressure | 31.9 MPa | p. 45 |
| Travel Relief Pressure | 35.3 MPa | p. 45 |
