Part of the Hitachi Repair Manuals.
Wrenching on a Hitachi EX750-5 or EX800H-5? This 665-page Hitachi EX750-5, EX800H-5 technical manual PDF walks you through both hydraulic excavators, from the main pump and swing device down to the track adjuster and front attachment cylinders. Inside: full hydraulic schematics, electrical wiring diagrams, and a huge troubleshooting section that traces faults through the control, hydraulic, and electrical systems step by step. You also get operational performance tests for the engine and excavator, plus removal and installation procedures covering the control valve, swing bearing, travel device, and center joint. Set the high relief pressure to 34.3 MPa (4980 psi) and confirm swing speed hits 8.6 rpm on the performance test. No more diagnosing a lazy swing circuit by feel. Bookmarked and text-searchable; type a spec, jump straight to the page, and get the machine digging again.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 1-2 | Manual Composition, Additional References, Page Numbering, Safety Alert Symbols, Unit Conversion |
| General | 3-34 | Specifications, Component Specifications, Component Layout |
| System | 35-80 | Control System, Hydraulic System, Electrical System |
| Component Operation | 81-173 | Pump Device, Swing Device, Control Valve, Pilot Valve, Travel Device |
| Operational Performance Test | 174-229 | Engine Test, Excavator Test, Component Test |
| Troubleshooting | 230-398 | Diagnosing Procedure, Troubleshooting a, Troubleshooting B, Troubleshooting C, Electrical System Inspection |
| Upperstructure | 399-542 | Cab, Counterweight, Pump Device, Control Valve, Swing Device, Pilot Valve, Pilot Shut-Off Valve, Shockless Valve |
| Undercarriage | 543-638 | Swing Bearing, Travel Device, Center Joint, Track Adjuster |
| Front Attachment | 639-665 | Front Attachment Cylinder, Cylinder |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Swing Speed | 8.6 min-1 (rpm) | p. 5 |
| Full flow filter nominal filtration rating | 12 µm or less | p. 17 |
| Pilot filter nominal filtration rating | 10 µm | p. 17 |
| Suction filter nominal filtration rating | 177 µm | p. 17 |
| High relief pressure | 34.3 MPa (4980 psi) | p. 114 |
| Low relief pressure | 30.9 MPa (4480 psi) | p. 114 |
| Rocker arm shaft mounting bolts (1) | 157 N⋅m (116 lbf⋅ft) | p. 180 |
| Housing mounting bolts (2) to (7) | 118 N⋅m (87 lbf⋅ft) | p. 180 |
| O-ring Seal Joint (Union Nut 19) | 59 N·m | p. 394 |
| O-ring Seal Joint (Union Nut 22) | 98 N·m | p. 394 |
| Tightening torque for bolts (7) on counterweight | 2750 N·m (280 kgf·m, 2025 lbf·ft) | p. 410 |
| Tightening torque for bolts (1) on counterweight | 390 N·m (40 kgf·m, 290 lbf·ft) | p. 410 |
