Part of the Hitachi Repair Manuals.
All 269 pages of this Hitachi EX8-2B Technical Manual PDF cover one machine: your EX8-2B hydraulic excavator, from pump device to travel motor. Inside you get the full hydraulic circuit diagrams, electrical circuit and main harness schematics, exploded views of the pump, control valve, and swing device, plus a complete troubleshooting section with diagnosing procedures and electrical system inspection. Operational performance tests are here too: engine test, excavator test, and component standards, so you can prove the repair actually worked. Torque the 19 mm hydraulic hose union joints to 29.5 Nm, then set the 30-degree male unions at 59 Nm and the 37-degree females at 44 Nm. No more chasing wiring faults with a multimeter and a prayer. Bookmarked and text-searchable; download it, pull it up on your phone next to the machine, and start wrenching.
Complete the set for your EX8-2B
- Parts Catalog: Hitachi EX8-2B Excavator Parts Catalog
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 2-11 | Specifications, Component Layout |
| System | 12-15 | Hydraulic System |
| Component Operation | 16-37 | Pump Device, Swing Device, Control Valve, Travel Device, Others |
| Operational Performance Test | 38-67 | Introduction, Engine Test, Excavator Test, Component Test, Standard |
| Troubleshooting | 68-97 | Diagnosing Procedure, Troubleshooting a, Troubleshooting B, Electrical System Inspection |
| The Attached Diaglam List | 98-103 | Electrical Circuit Diagram, Main Harness, Hydraulic Circuit |
| General Information | 104-117 | Tightening |
| Upperstructure | 118-137 | Pump Device, Control Valve, Swing Device |
| Undercarriage | 138-155 | Travel Device, Center Joint |
| Front Attachment | 156-169 | Cylinder |
| Engine and Accessory | 170-269 | Engine Body, Lubication System, Cooling System, Fuel System, Electrical System, General, Lubricating System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Track Shoe Width | 180 mm (0’ 7”) | p. 4 |
| Battery voltage | 12 V | p. 75 |
| Hydraulic hoses and union joints torque (19 mm) | 29.5 Nm | p. 111 |
| 30° male union joint torque (19 mm) | 59 Nm | p. 114 |
| 37° female union joint torque (19 mm) | 44 Nm | p. 114 |
| Sprocket Dimension D Standard | 291.0 mm | p. 151 |
| Pin A Standard | 25 mm | p. 163 |
| Bushing (Boom) A Standard | 25 mm | p. 163 |
| Injection pump fuel pressurization | 13.73 to 14.71 MPa (140 to 150 kgf/cm², 1991 to 2062 psi) | p. 188 |
| Air pressure at the nozzle (for cleaning) | 690 kPa (7kgf/cm2, 100 psi) | p. 216 |
| Engine Rated Horsepower | 6.4 kW/2450 min-1 | p. 4 |
| Machine Weight (Standard) | 740 kg | p. 4 |
