Part of the Hitachi Repair Manuals.
This 512-page Hitachi Technical Manual covers the EX27U, EX30U, EX35U, EX29UE, EX32UE and EX36UE excavators in one book: the technical volume up front (p2-180) and the workshop volume behind it (p181-512). It walks the hydraulic system from the pump device and control valve through the swing and travel circuits, gives you the operational performance tests with their standard values, the troubleshooting trees for engine and actuator faults, and the full disassembly, inspection and reassembly of the upperstructure, undercarriage, front attachment and the Isuzu engine. Wiring and hydraulic circuit diagrams close the book (p508-512).
Complete the set for your EX27U to EX36UE
- Parts Catalog: Hitachi EX27U Excavator Parts Catalog
- Parts Catalog: Hitachi EX30U Excavator Parts Catalog
- Parts Catalog: Hitachi EX35U Hydraulic Excavator Parts Catalog
Other edition of this manual
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 2-13 | Specification (Specifications, Working Ranges and Machine Dimensions for Transportation, Engine Specification, Interchangeability) |
| System | 14-25 | Hydraulic System (Outline, Main Circuit, Pilot Circuit) |
| Component Operation | 26-87 | Pump Device (Outline, Main Pump, Pilot Pump, Horse Power Control Operation) |
| Operational Performance Test | 88-133 | Engine Speed, Travel Speed, Swing Speed, Primary Pilot Pressure, Main Relief Valve Set Pressure, Operational Performance Standard |
| Troubleshooting | 134-180 | Engine System Troubleshooting, Actuator Operating System Troubleshooting, Front Attachment System Troubleshooting, Swing System Troubleshooting, Travel System Troubleshooting |
| General Information | 181-198 | Precautions for Disassembling and Assembling, Tightening Torque Specifications, Torque Chart, Piping Joint, Standard Bolt Torques |
| Upperstructure | 199-277 | Canopy, Counterweight, Pump Device, Control Valve, Swing Device, Pilot Valve |
| Undercarriage | 278-333 | Swing Bearing, Travel Device, Center Joint, Track Adjuster, Front Idler, Rollers |
| Front Attachment | 334-385 | Boom Cylinder, Arm Cylinder, Bucket Cylinder, Blade Cylinder, Swing Cylinder |
| Engine | 386-507 | General Information, Disassembly, Inspection and Repair, Lubrication System, Cooling System, Fuel System |
| All Diagrams | 508-512 | Electrical Circuit Diagram, Hydraulic Circuit Diagram, Component Legend |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| EX27u, 29uE | ||
| Engine | ISUZU 16.9 kW/2450 min⁻¹ (23 PS/2450 rpm) | p. 4 |
| Operating Weight, Canopy (EX27U/EX30U) | 2850 kg | p. 4 |
| All Models | ||
| Track Adjuster | 1 to 1.5 turns counterclockwise | p. 87 |
| Fuel injection pressure variation per shim 0.1 mm | 206 kPa (2.1 kgf/cm², 30 psi) | p. 95 |
| Main relief valve adjusting screw turn (EX30U) | 4 mm | p. 120 |
| Main relief valve lock nut torque (EX30U) | 20 +3/-0 N·m (2 +0.3/-0 kgf·m, 14.5 +2.2 -0 lbf·ft) | p. 120 |
| Coolant temperature for overheat indicator | above 110 ± 2 °C(230 ± 35 °F) | p. 167 |
| Tightening Torque for Union Nut (19 mm wrench size) | 59 N·m (6, 44 kgf·m, lbf·ft) | p. 196 |
| Tightening Torque for Union Nut (22 mm wrench size) | 98 N·m (10, 72 kgf·m, lbf·ft) | p. 196 |
| Intake and Exhaust Valve Clearance (cold) | 0.20 ± 0.05 (0.008 ±0.002) mm (in.) | p. 407 |
| 27u, 29uE | ||
| Track adjuster weight | 9.1 kg (20 lb) | p. 320 |
| EX30u, 32uE | ||
| Operating Weight, Canopy (EX35U/EX36UE) | 3100 kg | p. 5 |
