Part of the Hitachi Repair Manuals.
Every 470 pages of this Hitachi EX50u Technical Manual PDF cover one machine: your EX50u compact excavator, from the pump device to the final drive. You get factory wiring diagrams, a full troubleshooting section for engine, actuator, and electrical faults, and complete torque charts for disassembly and reassembly. Inside: operational performance tests for engine speed, travel speed, swing speed, and cylinder cycle times, plus teardown procedures for the swing bearing, travel device, boom, arm, and bucket cylinders. Warm the hydraulic oil to 50±5 °C before pressure testing, then torque the overload relief valve to 42 to 49 N·m. No more chasing electrical gremlins with a test light and a hunch. Bookmarked PDF that opens on any device; search a spec by keyword, walk to the machine, and get to work.
Complete the set for your EX50u
- Parts Catalog: Hitachi EX50U Parts Catalog
Other edition of this manual
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Specification | 2-7 | Specifications, Working Ranges, Engine Specification |
| Component Layout | 8-11 | Main Components, Electrical System, Relays, Monitor and Switches |
| System | 12-19 | Hydraulic System Outline, Main Circuit, Pilot Circuit |
| Component Operation | 20-67 | Pump Device, Swing Device, Control Valve, Pilot Valve, Travel Device, Solenoid Valve |
| Operational Performance Test | 68-109 | Engine Speed, Travel Speed, Swing Speed, Hydraulic Cylinder Cycle Time, Primary Pilot Pressure, Main Relief Valve Set Pressure |
| Troubleshooting | 110-153 | Diagnosing Procedure, Engine System Troubleshooting, Actuator Operating System Troubleshooting, Malfunction of Coolant Temperature Gauge, Electrical System Inspection |
| All Diagrams | 154-156 | |
| General Information | 157-172 | Precautions for Disassembling, Precautions for Assembling, Tightening Torque Specification, Torque Chart, Piping Joint |
| Upperstructure | 173-272 | Canopy, Counterweight, Pump Device, Control Valve, Swing Device, Pilot Valve |
| Undercarriage | 273-316 | Swing Bearing, Travel Device, Center Joint, Front Idler, Upper and Lower Roller, Track |
| Front Attachment | 317-348 | Boom Cylinder, Arm Cylinder, Bucket Cylinder, Swing Cylinder, Blade Cylinder |
| Engine | 349-470 | Lubrication System, Cooling System, Fuel System, Troubleshooting, Special Tools |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bucket Capacity (Heaped) | 0.16 (5.7 ft³): PCSA (0.14: CECE) | p. 4 |
| Hydraulic oil temperature | 50±5 °C (122±9 °F) | p. 99 |
| Lock nut tightening torque | 19.6 N·m (2 kgf·m, 14.5 lbf·ft) | p. 100 |
| Drain hose tightening torque | 29 N·m (3 kgf·m, 22 lbf·ft) | p. 103 |
| Overload relief valve torque | 42 to 49 N·m (4.2 to 5 kgf·m, 30 to 36 lbf·ft) | p. 133 |
| Lock nut torque | 19.6 N·m (2 kgf·m, 14.5 lbf·ft) | p. 133 |
| Floating seal replacement | new one | p. 161 |
| O-rings, backup rings and oil seals replacement | new ones | p. 159 |
| Low-pressure-hose clamp tightening torque (T-Bolt Type Band Clamp) | 4.4 N·m (0.45 kgf·m, 3.25 lbf·ft) | p. 171 |
| Low-pressure-hose clamp tightening torque (Worm Gear Type Band Clamp) | 5.9 to 6.9 N·m (0.6 to 0.7 kg·m, 4.3 to 5.1 lbf·ft) | p. 171 |
| O-Ring | O-Ring | p. 185 |
| Check for oil leaks | Check the hoses for oil leaks | p. 184 |
