Part of the Hyundai Repair Manuals.
Wrenching on a Hyundai HL770-9 or HL770XTD-9? This 640-page service manual PDF covers both wheel loader variants, from the torque converter to the bucket pins. Inside: complete wiring diagrams with connector pinouts, hydraulic schematics for the full circuit, transmission fault codes for the electro-hydraulic shift control, and step-by-step disassembly procedures for the transmission, axles, brakes, steering, and work equipment. A full troubleshooting section covers resistance measurements and operational checks. Torque the main pump housing mounting bolts to 19.6±2.9 kgf·m, and replace brake linings once residual thickness drops below 2.0 mm. Chasing an electrical gremlin through your loader's harness is no way to spend a Friday. Bookmarked by system and keyword-searchable; download it, find the spec, and get your machine back on the pile.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-36 | Safety Hints, Specifications, Operational Checkout Record Sheet |
| Engine | 37-45 | Engine Speed and Stall RPM, Fuel Warmer System |
| Power Train System Overview | 46-50 | Component Overview, Hydraulic Circuit, Torque Converter, Hydrodynamic Torque Converter |
| Transmission Structure and Operation | 51-66 | Transmission Layout, Installation View, Forward/Reverse Gear Operation, Electro-Hydraulic Shift Control, Gear Selector, Electric Control Unit |
| Transmission Fault Codes | 67-77 | Machine Fault Codes, Engine Fault Codes, Operating Modes |
| Transmission Troubleshooting and Testing | 78-113 | Transmission Fault Detection, Resistance Measurement, Axle Operation, Differential Operation, Tire and Wheel, Operational Checks |
| Transmission Disassembly and Assembly | 114-320 | Control Valve Disassembly, Transmission Disassembly, Multi-Disc Clutch Dismantling, Bearing Preload Adjustment, Axle Disassembly, Differential Carrier Disassembly |
| Brake System | 321-367 | Operational Checks and Troubleshooting, Tests and Adjustments, Disassembly and Assembly |
| Steering System | 368 | Operational Checks and Troubleshooting, Tests and Adjustments, Disassembly and Assembly |
| Structure and Function | 369-462 | Flow Amplifier, Steering Unit, Steering Cylinder |
| Work Equipment | 463-554 | Operational Checks and Troubleshooting, Tests and Adjustments, Disassembly and Assembly |
| Electrical System | 555-640 | Component Location, Electrical Circuit, Monitoring System, Electrical Component Specification, Connectors, Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Engine mounting bolt, nut (rubber, 2EA) | 100±15 kgf·m | p. 31 |
| Main pump housing mounting bolt | 19.6±2.9 kgf·m | p. 30 |
| Steering cylinder Bore dia × Rod dia × Stroke | Ø 95 × Ø 50 × 480 mm | p. 30 |
| Emergency release actuation torque | 40 Nm to 70 Nm | p. 345 |
| Min. residual thickness of brake lining | 2.0 mm | p. 346 |
| Gland tightening torque | 50±5 kgf·m (362±36 lbf·ft) | p. 451 |
| Hydraulic oil tank capacity | 200 L | p. 517 |
| Hydraulic oil filter replacement interval | 250 operating hours | p. 530 |
| Pilot cut off, parking brake, attach lock, unlock solenoid resistance | 15~25 Ohm | p. 607 |
| Engine Oil Quantity | 23L | p. 27 |
| HL770-9 | ||
| Operating Weight, HL770-9 | 23100 kg | p. 22 |
| HL770XTD-9 | ||
| Operating Weight, HL770XTD-9 | 23850 kg | p. 23 |
