1990s–2000s Hitachi EX33Mu & EX58Mu Hydraulic Excavator Technical & Workshop Manuals (P/N 588T-01–01)

This Hitachi technical and workshop manual set covers the 1990s–2000s EX33Mu and EX58Mu hydraulic excavators in canopy and cab configurations. It combines system operation and troubleshooting with component disassembly, inspection, and assembly procedures.

• Engine testing and repair: Compression checks, valve-clearance adjustment, injection-nozzle testing, injection timing, cylinder-head service, and crankshaft inspection.

• Hydraulic components: Main and pilot pump service, control-valve overhaul, main and overload relief valve pressure settings, and hydraulic-system air bleeding.

• Swing and travel: Model-specific motor and reduction-gear disassembly, parking-brake service, leakage tests, drift checks, and travel-performance diagnosis.

• Front attachment and undercarriage: Boom and cylinder removal, seal replacement, center-joint repair, swing-bearing installation, roller inspection, and rubber-crawler replacement.

• Electrical and boom-stop controls: Starter and monitor-panel troubleshooting, sensor and solenoid checks, Dr.EX diagnostics, height restriction, and auto boom-stop initial setting.

• Diagrams and service data: Hydraulic circuit sheets, electrical schematics, component section views, exploded assemblies, maintenance standards, torque tables, and electrical test specifications.

Hitachi wrote these manuals for experienced technicians performing machine maintenance and repair.

Hydraulic, Swing, and Travel Systems

The system descriptions explain variable-displacement main hydraulic pumps, axial-plunger swing motors, and multistage planetary swing reduction gears. Flow-combiner, main-relief, overload-relief, and make-up valves are covered alongside pilot valves and solenoid-actuated travel-speed controls.

The workshop sections separate the two models' pump, swing-motor, swing-reduction, and travel-device assembly procedures. Inspection standards accompany the component breakdowns.

Performance testing covers track revolution speed, mistrack checks, swing-bearing play, swing function drift, travel and swing motor leakage, and hydraulic-cylinder cycle time.

The mistracking flowchart distinguishes pump, control-valve, center-joint, and travel-motor faults, helping you narrow down the assembly that needs repair before teardown.

The pump-service precautions explain why starting with air trapped in the pump housing can damage the pump. Working with high-pressure hydraulic circuits and heavy swing mechanisms carries inherent operational risks.

Front Attachment and Undercarriage Repair

Front-attachment procedures cover upper and lower boom removal and installation, with cylinder service for the boom, arm, bucket, boom-swing, and blade. Pin and bushing limits, piston-rod wear criteria, and cylinder-specific tightening data support component inspection.

Undercarriage work extends to swing-bearing positioning, center-joint seals, track adjusters, front idlers, and upper and lower rollers. Rubber-crawler replacement and steel-track wear standards are both included.

Engine Repair and Fuel-System Checks

The EX33Mu's Kubota D1503-KA and the EX58Mu's Isuzu 4LE1PA-01 have separate machine test procedures. The workshop engine chapters include broader Kubota 92.4 mm Stroke Series and Isuzu engine-family material, with variant-specific tables to read alongside Hitachi's installed-engine specifications.

Internal repair coverage includes cylinder heads and valves, pistons and connecting rods, crankshafts and bearings, timing gears, and cylinder-bore inspection. Lubrication and cooling sections address oil pumps, water pumps, thermostats, and related inspection limits.

Fuel-system material covers injection-pump checks, nozzle-holder service, and governor assemblies. The Kubota section also includes starter, alternator, regulator, and glow-plug testing.

Electrical Diagnosis and Auto Boom-Stop

Dr.EX coverage includes stored fault codes, operation records, zone checks, sensor readings, controller inputs and outputs, and the Troubleshooting Screen Flow Chart.

Electrical Part Layout drawings locate components; work-light and horn circuit schematics support continuity and voltage checks. Boom-stop correction cautions explain how an incorrect setting can let the boom strike the canopy or cab.

Circuit References, Tools, and Specifications

The EX33Mu Hyd. Circuit and EX58Mu Hyd. Circuit sheets show the separate hydraulic layouts. Engine references include the Lubricating Oil Circulation System Diagram and Cooling Water Circulation System Diagram.

Special-tool references include front pilot-valve tool ST 7924 and travel-device bearing-nut tool ST 3146. Machine dimensions, component torque tables, wear limits, performance standards, and SI conversion tables provide supporting repair data.

The operator's manual and parts catalogs are separate references.

PDF Navigation and Page Breakdown

This is a 789-page PDF combining 207 pages of technical material and 582 workshop pages, already including both cover pages, two added hydraulic circuit sheets, and the engine sections with English, French, and German Kubota material. Body text is not searchable; usable text search is limited to the cover titles and added hydraulic sheets. Chapter bookmarks cover both manuals, apart from an external Contents.pdf link; small circuit labels require zooming.