Part of the Hyundai Repair Manuals.
Every one of this manual's 547 pages targets one machine: the Hyundai HL780-3 wheel loader. If you have been hunting a Hyundai HL780-3 service manual PDF with real factory data, this is it. Inside: electrical circuit diagrams for the starting circuit, monitoring system, and connectors, hydraulic schematics tracing the main pump, flow amplifier, and remote control valve, plus full troubleshooting sections for the power train, brakes, and steering. You also get exploded views of the major assemblies and page after page of step-by-step disassembly and reassembly procedures. Set the pressure relief valve to 3.1 kgf·m (22.4 lbf·ft) and confirm torque converter stall speed lands between 2070 and 2210 rpm. No more chasing wiring faults with a multimeter and a prayer. Bookmarked front to back; type any spec into the search bar and pull it up on whatever device is in the cab.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 9-32 | Safety Hints, Specification, Operational Checkout Record Sheet |
| Engine | 33-51 | Cooling System, Lubrication System |
| Power Train System | 52-247 | |
| Brake System | 248-283 | Brake System Structure and Function, Brake Pump, Brake Valve, Cut Off Valve, Brake Accumulator, Pressure Switches, Service Brake |
| Group 4 Disassembly and Assembly | 284-291 | |
| Group 1 Structure and Function | 292-309 | Steering System, Flow Amplifier |
| Group 2 Operational Checks and Troubleshooting | 310-317 | |
| Group 3 Tests and Adjustments | 318-391 | Hydraulic Oil Clean Up Procedure Using Portable Filter Caddy, Steering Pump, Flow Amplifier, Steering Cylinder |
| Work Equipment | 392-473 | Hydraulic System Outline, Remote Control Valve, Boom Section Operation, Hydraulic Oil Tank, Main Pump |
| Electrical System | 474-547 | Starting Circuit, Monitoring System, Switches, Electrical Component Specification, Connectors, Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Torque converter stall rpm | 2070 ~ 2210rpm | p. 88 |
| Torque M12x1.5 | 2.9 ± 0.31kgf·m | p. 265 |
| Torque M16x1.5 | 4.1 ± 0.51kgf·m | p. 265 |
| Tightening torque for pressure relief valve | 3.1 ± 0.3kgf·m (22.4 ± 2.2lbf·ft) | p. 358 |
| Tightening torque for plug or throttle check valve | 1 ± 0.3kgf·m (7.2 ± 2.2lbf·ft) | p. 356 |
| Tightening torque for orifice | 0.5 ± 0.1kgf·m (3.6 ± 0.7lbf·ft) | p. 356 |
| Tightening torque for orifice in housing | 0.5 ± 0.1kgf·m (3.6 ± 0.7lbf·ft) | p. 356 |
| Control port 5 pressure | 22bar | p. 407 |
| Pilot oil supply unit pressure setting | 3MPa | p. 419 |
| Engine Rated Gross Horse Power | 340 ps | p. 23 |
| Engine Oil Quantity | 40 L | p. 23 |
| Main Pump Capacity | 100 cc/rev | p. 23 |
