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Part of the Hitachi Repair Manuals.
Tracking down a swing bearing fault on your Hitachi EX8, EX12, EX15, EX22, or EX30? This 730-page OEM T580-01 Hitachi excavator technical manual PDF breaks down the complete upperstructure, undercarriage, and hydraulic pump assemblies. You get complete hydraulic schematics detailing pump device construction, plus full wiring diagrams for the travel brake, pilot valves, and engine accessories. Open up the massive troubleshooting section to diagnose mistrack issues, then follow step-by-step teardowns for the track adjusters, swing bearing, center joints, and boom cylinders. Verify your routine maintenance accurately by confirming the 2,500-hour hydraulic oil replacement interval and noting the specific 500-hour engine oil service requirement for the EX12 and EX15 variants. Your equipment is down and the clock is ticking. Grab this bookmarked, searchable download, pull it up on your shop tablet, and get back to work.
What's Inside This Hitachi EX8 to EX30 Manual
| System | Pages | Key Topics |
|---|---|---|
| Technical Manual Introduction & Safety | 2-15 | Safety Alert Symbol, Safe Procedures, Emergency Preparedness, Fluid Safety, Battery Explosions, Acid Burns, High-Pressure Fluids, Moving Parts |
| Technical Manual Specifications | 16-28 | General Information, Dimensions and Weights, Fuels and Lubricants, Interchangeability, EX8 Specifications, EX12-EX15 Specifications, EX22-EX30 Specifications, Working Range |
| Technical Manual Upperstructure | 82-159 | Outline, Fuel Tank, Hydraulic Oil Tank, Pump Device Construction, Swing Device Operation, Pipings Diagrams, Control Valve Components, Pilot Valve Function |
| Technical Manual Undercarriage | 160-189 | Component Location, Swing Bearing Operation, Center Joint Construction, Travel Device, Travel Reduction Gear, Travel Motor Operation, Travel Brake Valve, Travel Speed Change Valve |
| Technical Manual Operational Performance Test | 190-225 | Purpose, Terminology, Preparation for Tests, Engine Speed Measurement, Engine Compression Pressure, Travel Speed, Track Revolution Speed, Mistrack Check |
| Technical Manual Troubleshooting | 226-287 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Hydraulic oil replacement interval | 2500 (Hours) | p. 70 |
| Engine oil pressure (Allowable limit) | 98 kPa 1.0 kgf/cm² 14 psi | p. 620 |
| EX30 | ||
| Front idler weight | 30.2 kg (66.5 lb) | p. 478 |
| EX8 | ||
| Front Idler Dimension A ND | 20 (0.787) | p. 479 |
| Bushing (Bucket Cylinder) ND | 25 (0.984) | p. 507 |
| Bushing (Bucket Cylinder) LU | 26.5 (1.04) | p. 507 |
Hitachi EX8 to EX30 Common Problems This Manual Covers
Hitachi EX30 hydraulic cylinder won't move and boom, arm, and bucket functions run slow under load
Check the troubleshooting chart first. Verify the main relief valve holds 210 ± 10 kgf/cm² as specified on page 220; if pressure reads low, inspect the pump swash plate linkage and relief valve seat for wear before replacing any seals.
Manual Section: Hydraulic System TroubleshootingFinal drive motor seals leaking oil, track running hot and losing power intermittently
Inspect the final drive motor seals and housing for wear using the Workshop Manual Undercarriage teardown starting on page 434. Measure track link tension and reset it to 120-140 mm as specified on page 486; over-tight tracks accelerate seal wear, so back off the adjuster and recheck before reassembling the housing.
Manual Section: Workshop Manual Undercarriage p. 434Engine won't start or cranks slowly in cold weather despite a fully charged battery
Check the engine troubleshooting chart starting first. Verify oil pressure against the allowable limit of 98 kPa (14 psi) listed on page 620; a low reading points to a worn oil pump or clogged pickup screen. Test the starter circuit and battery voltage before condemning glow plugs or injectors.
Manual Section: Technical Manual TroubleshootingEngine smokes heavily and loses power under load with poor throttle response
Clean or replace the air filter element using shop air at 690 kPa (100 psi) to blow dust from the pleats, as specified on page 582. Replace the fuel filter element, made from very fine filter paper per page 554, and verify injection pressure falls between 140 and 150 kgf/cm² (page 624) before adjusting the injectors.
Manual Section: Workshop Manual Engine and Accessory (EX8) p. 582Air filter clogs quickly and the dust warning light stays on constantly
Check the air cleaner electronic indicator on the console, standard on EX22 and EX30 models as described on page 149. Remove the element and clean it with shop air at 690 kPa (100 psi) per page 582, holding the nozzle back from the pleats. Replace the element if the indicator relights right after cleaning.
Manual Section: Technical Manual Upperstructure p. 149Frequently Asked Questions
What are the torque specifications for the main pump mounting bolts on a Hitachi EX22-2 excavator?
For the Hitachi EX22-2, the main pump mounting bolts (10 mm diameter) should be tightened to a torque of 49.04 N-m (5.0 kgf-m, 36.17 lbf ft). This specification is crucial for proper assembly and operation of the pump device. p. 312
What are the torque specifications for the track roller mounting bolts on a Hitachi EX30-2 excavator?
For the Hitachi EX30-2, the track roller mounting bolts (14 mm diameter) should be tightened to a torque of 166.71 N-m (17.0 kgf-m, 122.96 lbf ft). This ensures secure attachment of the track rollers to the undercarriage. p. 313
How do I reset the Hitachi EX8 error code?
The manual does not provide specific error codes or a procedure to reset them for the Hitachi EX8. The troubleshooting section focuses on symptoms and probable causes rather than specific error codes. p. 228
How do I reset the Hitachi EX12-2 service interval?
The manual does not describe a specific procedure to reset a service interval light or indicator for the Hitachi EX12-2. Maintenance intervals are listed, such as replacing the fuel filter element every 500 hours. p. 69
How will I receive this Hitachi EX8 & variants Technical Manual?
A 730-page Technical Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this Hitachi EX8 & variants Technical Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Does this Hitachi EX8 & variants manual include wiring diagrams?
Yes. You'll find an electrical wiring diagram covering the main wiring layout.
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