This manual is a complete factory service repair manual for Hitachi ZX55U-5A Hydraulic Excavators. This manual consists of three portions: Hitachi ZX55U-5A Technical Manual, the CIRCUIT DIAGRAM Manual and Hitachi ZX55U-5A Workshop Manual. Information included in the Technical Manual(Troubleshooting): technical information needed for operational performance tests, and troubleshooting procedures and Electrical Circuit Diagram. Information included in the Workshop Manual: technical information needed for maintenance and repair of the machine, tools and devices needed for maintenance and repair, maintenance standards, and removal/installation and assemble/disassemble procedures. Service Repair Manual Covers: WORKSHOP MANUAL SECTION 1 GENERAL Group 1 Precautions for Disassembling and Assembling Group 2 Tightening Group 3 Painting Group 4 Bleeding Air Group 5 Pressure Release Procedure Group 6 Preparation SECTION 2 MAINTENANCE STANDARD Group 1 Upperstructure Group 2 Undercarrlage Group 3 Front Attachment SECTION 3 UPPERSTRUCTURE Group 1 Canopy and Cab Group 2 Counterweight Group 5 Pump Device Group 6 Control Valve Group 7 Swing Device Group 8 Pilot Valve Group 9 Solenoid Valve Group 10 Revolution Sensing Valve Group 11 Auxiliary Flow Rate Selector Valve SECTION 4 UNDERCARRIAGE Group 1 Swing Bearing Group 2 Travel Device Group 3 Center Joint Group 4 Track Adjuster Group 5 Front Idler Group 6 Upper and Lower Roller Group 7 Track Group 8 Blade Cylinder SECTION 5 FRONT ATTACHMENT Group 1 Front Attachment Group 2 Cylinder TECHNICAL MANUAL SECTION 1 GENERAL Group 1 Specification Group 2 Component Layout Group 3 Component Specifications SECTION 2 SYSTEM Group 1 Control System Group 2 Hydraulic System Group 3 Electrical System SECTION 3 COMPONENT OPERATION Group 1 Pump Device Group 2 Revolution Sensing Valve Group 3 Swing Device Group 4 Control Valve Group 5 Pilot Valve Group 6 Travel Device Group 7 Others (Upperstructure) Group 8 Others (Undercarriage) SECTION 4 OPERATIONAL PERFORMANCE TEST Group 1 Introduction Group 2 Standard Group 3 Engine Test Group 4 Machine Performance Test Group 5 Component Test SECTION 5 TROUBLESHOOTING Group 1 Diagrosing Procedure Group 2 Monitor Group 3 Troubleshooting A Group 4 Troubleshooting B Group 5 Air Conditioner Hitachi ZX55U-5A ELECTRICAL CIRCUIT DIAGRAM Hitachi ZX55U-5A HYDRAULIC CIRCUIT DIAGRAM ================================================== High Quality PDF Manual,All pages are printable. Instant Download No Shipping Cost No Need to Wait For A CD-ROM File Format: PDF Language: English Compatible: All Versions of Windows & Mac Requirements: Adobe PDF Reader Thanks for visiting.