Part of the Hitachi Repair Manuals.
This 655-page Hitachi Zaxis 40U/50U Technical Manual (OEM #T1LDE-00) covers the full Zaxis 40U and 50U hydraulic excavator line, technical and workshop sections included. You get wiring diagrams for the power circuit, indicator light and accessory circuits, and preheating, starting, and charging circuits, plus hydraulic schematics covering the solenoid valve unit and pump control system. Inside: a full troubleshooting section, torque specification tables, exploded parts views, and maintenance interval schedules pulled straight from the factory workshop manual. The pilot filter spec calls for 10 μm filtration, and the solenoid valve unit's relief set pressure runs 3.9 MPa (40 kgf/cm², 570 psi), real numbers, not shop-forum guesses. No more chasing a hydraulic fault with a test light and a hunch. This PDF carries a full bookmark structure and a searchable text layer, so you can jump straight to the wiring or hydraulic section, find your spec, and get back under the machine.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General & Machine Specifications (Technical) | 32-49 | Machine Dimensions and Weight, Engine Specifications, Hydraulic Component Specifications, Performance Data |
| System Operation | 50-77 | Hydraulic System, Control System, Electrical System, Power Circuit Operation Overview |
| Component Operation | 78-159 | Main Pump, Control Valve, Pilot Valve, Solenoid Valve Unit, Swing Motor, Travel Motor, Cylinders |
| Operational Performance Test | 160-209 | Pump Delivery Pressure, Relief Set Pressure, Engine Speed, Cylinder Cycle Time, Track Adjuster Valve |
| Troubleshooting (Technical) | 210-261 | Diagnostic Procedures, Electrical System Inspection, Fault Symptom Charts, Fuse and Circuit Checks |
| General Information (Workshop) | 293-316 | Tightening Torques, Ors Fitting Torques, Service Standards, Sealant Application |
| Upperstructure | 317-420 | Swing Device, Pump Device, Control Valve, Pilot Valve, Cab and Counterweight Removal and Installation |
| Undercarriage | 421-478 | Travel Device, Center Joint, Track Adjuster, Track Shoe, Roller and Idler Removal and Assembly |
| Front Attachment | 479-534 | Boom, Arm, Bucket, Hydraulic Cylinders Removal, Installation and Disassembly |
| Engine | 535-610 | Engine Removal and Installation, Cylinder Head, Timing, Fuel Injection, Disassembly and Assembly |
| Lubricating System | 611-614 | Oil Pump, Oil Filter, Lubrication Circuit |
| Cooling System | 615-632 | Radiator, Water Pump, Thermostat, Coolant Specifications |
| Troubleshooting (Workshop) | 633-650 | Engine Fault Diagnosis, Hydraulic Fault Diagnosis, Repair Procedures |
| Circuit Diagrams (Fold-Out Schematics) | 651-655 | Electrical (Elc) Circuit, Engine Wiring, Floor Harness, Hydraulic Circuit, Main Harness |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Pilot Filter | 10 μm | p. 49 |
| Solenoid valve unit relief set pressure | 3.9 MPa (40 kgf/cm², 570 psi) | p. 48 |
| Track Adjuster Valve | 1 to 1.5 turns counterclockwise | p. 159 |
| Unload valve lock-nut torque | 34 to 39 N·m (3.5 to 4 kgf·m, 25 to 29 lbf·ft) | p. 208 |
| Coolant temperature for overheat indicator | above 110 ± 2 °C(230 ± 3.6 °F) | p. 249 |
| ORS fitting torque (PF 1/8) | 29.5 N·m (3 kgf·m) (22 lbf·ft) | p. 303 |
