Part of the Hitachi Repair Manuals.
All 789 pages of this Hitachi EX33Mu, 58Mu technical manual PDF focus on two machines: the EX33Mu and EX58Mu hydraulic excavators, plus their 30-2 and 55UR equivalents. You get separate hydraulic circuit schematics for each model, wiring diagrams for the full control system, and operational performance tests that tell you whether the pump, swing device, or travel motors are actually out of spec. A complete workshop manual rides along too, with teardown procedures for the upperstructure, undercarriage, front attachment cylinders, and both the 33Mu and 58Mu engines. Set the EX33Mu main relief valve to 220 ± 10 kgf/cm², and remember the four-second hydraulic timer before you condemn a slow circuit. No more guessing which relief valve is bleeding off your breakout force. Bookmarked from cover to cover; jump straight to the section you need and start wrenching.
What's Inside This Hitachi EX33Mu, 58Mu Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction and Safety | 2-29 | To the Reader, Page Numbering and References, Safety Precautions, Warning Signs, Safe Operation and Maintenance Rules |
| General Specifications | 30-39 | Machine Specifications, Bucket Capacity, Swing Speed, Dimensions, Component Interchangeability |
| Upperstructure (Technical) | 40-69 | Canopy, Counterweight, Pump Device, Control Valve, Swing Device, Pilot Valve, Hydraulic Oil Tank |
| Undercarriage (Technical) | 70-87 | Travel Device, Track Frame, Center Joint, Swing Bearing |
| Electrical System | 88-99 | Electrical Component Layout, Control System, Sensors and Switches, Wiring Harness |
| Hydraulic System | 100-105 | Hydraulic Circuit Overview, Main and Overload Relief Valves, Hydraulic Timer, Pilot Circuit |
| Operational Performance Test | 106-141 | Engine Test, Excavator Performance Test, Component Tests, Cylinder Drift Limits, Main Relief Valve Pressure Setting |
| Troubleshooting | 142-205 | Diagnosing Procedure, Engine Control System Faults, Hydraulic System Faults, Electrical Faults, Standard Values Table |
| Hydraulic Circuit Diagrams (EX33MU and EX58MU) | 206-210 | Blade, Arm, Bucket and Swing Cylinder Circuits, Travel Circuit, Pilot Circuit, Circuit Differences Between EX33MU and EX58MU |
| Workshop Manual: Safety and General Information | 211-250 | Precautions for Disassembling and Assembling, Tightening Torques, Special Tools, Sealants and Lubricants |
| Workshop Manual: Upperstructure Repair | 251-350 | Canopy and Counterweight Removal, Pump Device Disassembly, Control Valve Overhaul, Swing Device, Pilot Valve, Hydraulic Oil Tank Service |
| Workshop Manual: Undercarriage Repair | 351-431 | Swing Bearing, Travel Device Disassembly, Center Joint, Track Adjuster and Idler, Rollers, Track Chain |
| Workshop Manual: Front Attachment | 432-469 | Boom, Arm and Bucket Removal, Hydraulic Cylinder Disassembly and Inspection, Pin and Bushing Wear Limits |
| Engine : EX33MU | 470-667 | Engine Specifications and Performance, Cylinder Head and Valves, Piston and Crankshaft, Lubricating, Cooling and Fuel Systems, Engine Oil Pressure Limits, Overhaul Data |
| Engine : EX58MU | 668-789 | Engine Specifications, Lubricating System, Cooling System, Fuel System, Cylinder Head and Block, Overhaul and Service Data |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| EX33MU | ||
| Main Relief Valve Pressure Setting | 220 ± 10 kgf/cm² | p. 141 |
| Main Pump Delivery Pressure (standard) | 220 kgf/cm² (tolerance +10 / -0) | p. 190 |
| EX58MU | ||
| Main Pump Delivery Pressure (standard) | 250 kgf/cm² (tolerance +10 / -0) | p. 190 |
| All Models | ||
| Boom Cylinder Drift Limit (retraction) | 10 mm or less per 5 min | p. 140 |
| Arm Cylinder Drift Limit (extension) | 10 mm or less per 5 min | p. 140 |
| Engine Oil Pressure (at idle) | 0.5 kgf/cm² (49 kPa, 7 psi) | p. 626 |
| Engine Oil Pressure (at rated speed, allowable limit) | 2.5 kgf/cm² (245 kPa, 36 psi) | p. 626 |
| Bucket Capacity | 0.09 m³ | p. 34 |
| Swing Speed | 11 rpm | p. 34 |
| Hydraulic Timer Delay | 4 seconds | p. 55 |
Hitachi EX33Mu, 58Mu Common Problems This Manual Covers
Hitachi EX33Mu hydraulic pump losing power under load, all cylinders slow and bucket stalls mid-cut
Test main pump delivery pressure against the standard value on page 190: 220 kgf/cm² (tolerance +10 / -0) for the 33Mu. If pressure comes up short, pull the pump and measure internal clearances; cylinder block bore to plunger must be 0.050 mm or less (page 275). Anything beyond that, replace the rotating group.
Manual Section: Machine Operation System Troubleshooting (Actuator, Front Attachment, Swing, Travel) p. 190Hydraulic functions sluggish and jerky for the first hour of cold weather operation
Run the machine at mid-throttle and cycle the bucket until hydraulic oil reaches 50 plus or minus 5 degrees C (122 plus or minus 9 degrees F), the test temperature listed on page 139. Cold oil starves the pilot circuit; verify pilot pressure holds 65 plus or minus 5 kgf/cm2 once warm before working a grade.
Manual Section: Operational Performance Test p. 139Boom or arm drifts down under load within minutes of shutting off controls
Set the machine in the drift test position with oil at operating temperature and measure cylinder movement over five minutes. Arm cylinder extension and bucket cylinder retraction should stay within 10 mm per 5 minutes (page 140). If drift exceeds the limit, replace the cylinder piston seals; if it continues, inspect the overload relief valve.
Manual Section: Operational Performance Test p. 140Engine cranks strong but will not fire or start after fuel filter and line service
Bleed air from the fuel system at the filter and injection pump before anything else. Check injection timing next; both engines run 16 degrees before TDC (page 140). Follow the diagnosing procedure starting on page 142 to rule out the stop solenoid and safety relay before pulling injectors.
Manual Section: Diagnosing Procedure (General) p. 142Upperstructure swings slow one direction and will not hold position on a grade
Check pilot pressure at the swing spool first; it should hold 65 plus or minus 5 kgf/cm2 on either model (page 141). If pilot pressure is good, test the swing motor relief valve; on the 33Mu it must crack at 170 plus or minus 10 kgf/cm2. Clean or replace the valve cartridge if pressure runs low.
Manual Section: Machine Operation System Troubleshooting (Actuator, Front Attachment, Swing, Travel) p. 141Frequently Asked Questions
What are the recommended service intervals for the engine?
The recommended service intervals for the engine vary by component and operation. For example, checking fuel pipes and clamps is recommended every 50 hours, while changing the fuel filter cartridge is every 400 hours. Engine oil and oil cartridge should be changed after the first 50 hours of operation, and then according to the schedule. p. 559
What fluids and capacities does the EX33Mu and EX58Mu machine require?
For the EX33Mu engine (D1503-B(E)), Diesel Fuel No.2-D (ASTM D975) is recommended, with an oil pan capacity of 5.6 liters (1.48 US gals) for 90 mm depth or 7.0 liters (1.85 US gals) for 124 mm depth. For the EX58Mu engine (ISUZU 4LE1), Highspeed diesel fuel (SAE No.2) is recommended, with a total lubricant capacity of about 8.7 liters (9.2 qts). Both engines recommend lubricating oil better than CD class (API). p. 480
How do I troubleshoot if the engine won't start?
To troubleshoot an engine that won't start, first check the battery. If the battery is OK, then check the fuel system. If the fuel system is OK, proceed to check the preheating circuit. If the starter does not run, check the battery, then the magnetic switch, and finally the starter brush. p. 535
What are the valve clearance specifications for the EX33Mu and EX58Mu?
The valve clearance (cold) for the EX33Mu is 0.18 to 0.22 mm. For the EX58Mu, the valve clearance (cold) is 0.40 ±0.05 mm. These values are critical for proper engine operation and should be adjusted if outside the specified range. p. 140
What are the general tightening torque specifications for bolts and nuts?
For general use screws, bolts, and nuts, the tightening torques vary by size and strength class. For example, an M8 bolt (standard) has a torque of 17.7 to 20.6 N-m (1.8 to 2.1 kgf-m), while an M12 bolt (standard) requires 62.8 to 72.6 N-m (6.4 to 7.4 kgf-m). Always apply lubricant to threads and setting faces for special use screws, bolts, and nuts. p. 532
Is this Hitachi EX33Mu, 58Mu Technical Manual a digital download?
You get a 789-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Hitachi EX33Mu, 58Mu Technical Manual printable?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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