Part of the Hitachi Repair Manuals.
Need the exact tear-down protocols for your Hitachi mini excavator? This 868-page Hitachi EX12–EX45 Series Technical Manual, Workshop Manual PDF (OEM #T587E-01) breaks down the complete undercarriage, hydraulic, and engine systems for the EX12-2, EX15-2, EX18-2, EX22-2, and EX25-2 variants. You get complete hydraulic schematics tracing the pilot circuits, full wiring diagrams for the monitor relays, and a massive troubleshooting section covering every actuator and swing system fault. Open up to step-by-step disassembly procedures for the control valves, center joints, and track adjusters to rebuild your machine right the first time. Lock down the main pump mounting bolts to exactly 49 Nm and verify your swing speed hits 8.5 rpm before sending it back to the dirt. A dead machine on the job site burns cash fast. Download this searchable, bookmarked file directly to your tablet and get your excavator moving again.
Complete the set for your EX12-2 to EX45-2
- Parts Catalog: Hitachi EX30-2 Parts Manual
- Parts Catalog: Hitachi EX12-2 Excavator Parts Catalog
- Parts Catalog: Hitachi EX15-2 Excavator Parts Catalog
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 2-3 | |
| General | 4-23 | Specifications, Working Range•Transportation, Engine Specification, Main Components, Electrical System (Overall System), Electrical System (Relays) |
| System | 24-39 | Outline, Main Circuit, Pilot Circuit |
| Component Operation | 40-101 | Pump Device, Swing Device, Control Valve, Pilot Valve, Travel Device |
| Operational Performance Test | 102-153 | Engine Speed, Engine Compression Pressure, Travel Speed, Swing Speed, Main Relief Valve Set Pressure, Travel Motor Drainage |
| Troubleshooting | 154-197 | Troubleshooting a Procedure, Engine System Troubleshooting, Actuator Operating System Troubleshooting, Front Attachment System Troubleshooting, Swing System Troubleshooting |
| Attached Diagram List | 198-203 | |
| Safety | 206-231 | |
| General Information | 232-247 | Precautions for Disassembling and Assembling, Tightening Torque Specifications, Torque Chart, Piping Joint |
| Upperstructure | 248-347 | Pump Device, Control Valve, Swing Device, Pilot Valve, Solenoid Valve |
| Undercarriage | 348-435 | Swing Bearing, Travel Device, Center Joint, Track Adjuster, Front Idler, Upper and Lower Rollers |
| Front Attachment | 436-481 | Maintenance Standards, Remove and Install Cylinders, Disassemble and Assemble Cylinders |
| EX12-2 to EX35-2 Engine | 482-668 | Engine Body, Lubricating System, Cooling System, Intake/Exhaust System, Fuel System, Electrical System |
| EX40-2 / EX45-2 Engine | 669-868 | Engine Body, Lubricating System, Cooling System, Intake/Exhaust System, Fuel System, Electrical System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| EX12-2 | ||
| Swing Speed | 8.5 min⁻¹ (rpm) | p. 6 |
| All Models | ||
| Hydraulic system failure with loss of digging force and slow cycle times | All machine functions are slow. | p. 165 |
| Air cleaner | M-19 | p. 148 |
| INJECTION NOZZLE | M-25 | p. 150 |
| INJECTEURS | M-26 | p. 8 |
| Piston rod tightening torque | 36 mm, 41 mm, 46 mm, 55 mm | p. 477 |
| Set screw tightening torque | 3 mm, 4 mm | p. 186 |
| EX12-2, EX15-2, EX18-2 | ||
| Main Pump mounting bolt torque | 49 Nm (5 kgf·m, 36 lbf·ft) | p. 236 |
| Pilot Pump mounting bolt torque | 25 Nm (2.5 kgf·m, 18 lbf·ft) | p. 2 |
| EX22-2, EX25-2, EX30-2, EX35-2, EX40-2, EX45-2 | ||
| Clearance between cylinder block bore and plunger (D-d) | 0.05 mm or less | p. 268 |
| Clearance between plunger tip and shoe bottom (Delta) | 0.2 mm or less | p. 268 |
