Part of the Hyundai Repair Manuals.
Need the factory numbers for your HL770 wheel loader? This 485-page Hyundai HL770 service manual PDF walks the whole machine: torque converter and transmission teardown, brake and steering hydraulics, work equipment, and the full electrical system. You get hydraulic schematics tracing the main pump, flow amplifier, and control valves, plus wiring diagrams and a troubleshooting section keyed to cluster warning lamps (coolant overheat, low oil pressure, parking solenoid faults). Inside: pressure and flow tests, cylinder drift and leakage checks, and step-by-step disassembly for the main pump, boom cylinders, and transmission. Torque the front axle mounting bolts to 120 ± 15 kg·m, fill the engine with 39L of oil, and set the main pump at 210 kg/cm2. Your loader is parked and the clock is running. Bookmarked with a live text layer; search any spec, jump to any system, and get wrenching.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Conversion Table | 3-8 | Method of Using the Conversion Table, Example, Millimeters to Inches, Kilogram to Pound, Liter to U.S. Gallon, Liter to U.K. Gallon, Kgm to Lb Ft, Kg/Cm2 to Lb/In2 |
| General | 9-32 | Safety Hints, Specification (Major Components, Specifications, Weight, Tightening Torque), Operational Checkout Record Sheet |
| Engine | 33-43 | Structure, Cooling System, Fuel System, Lubrication System, Intake and Exhaust System |
| Power Train System | 44-183 | Structure and Function (Power Train Component Overview, Torque Converter, Transmission, Axle), Operational Checks and Troubleshooting (Power Train Operational Checks) |
| Brake System | 184-233 | Structure and Function (Outline, Brake Pump, Brake Valve, Cut-Off Valve, Parking Brake Cylinder, Brake Accumulator, Pressure Switches, Parking Brake) |
| Steering System | 234-327 | Structure and Function (Outline, Flow Amplifier, Steering Unit, Steering Cylinder), Operational Checks and Troubleshooting |
| Work Equipment | 328-410 | Structure and Function (Hydraulic System Outline, Main Pump Operation, Remote Control Valve, Main Control Valve, Main Relief Valve, Overload Relief Valve, Pilot Oil Supply Unit, Safety Valve Unit, Boom and Bucket Cylinder, Hydraulic Oil Tank, Accumulator) |
| Electrical System | 411-485 | Component Location |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tightening torque for M24 x 3.0 (10T) metric bolt | 85.0 - 115 kg·m | p. 26 |
| Tightening torque for Front axle mounting bolt (M30 x 2.0) | 120 ± 15 kg·m | p. 28 |
| Tightening torque for steering valve end cover screws (M10) | 3.1 ± 0.6 kg·m | p. 317 |
| Engine Oil Quantity | 39 L | p. 23 |
| Maximum Operating Pressure (Main Pump) | 210 kg/cm2 | p. 23 |
| Transmission Oil Capacity | 43 L | p. 29 |
| Clutch Cut-off Pressure Switch Rated Pressure | 25 kgf/cm2 | p. 84 |
| Main Relief Valve Pressure | 200 kg/cm2 | p. 24 |
| Parking Brake Cylinder Operating Pressure | 150 kgf/cm2 | p. 203 |
