Part of the Hyundai Repair Manuals.
Every one of the 532 pages in this Hyundai HL770-7 service manual PDF covers the wheel loader itself: power train, brakes, steering, work equipment, and the full electrical system. You get factory wiring diagrams with connector locations and pinouts, hydraulic schematics tracing every circuit, and error code charts for the monitoring system. Page after page of disassembly and assembly procedures walk you through each system, from torque converter to boom cylinder. Torque the six engine mounting bolts to 100 ± 15 kgf·m and set the converter back pressure valve at 3.5 bar; the numbers are right there in the tables. No more chasing electrical gremlins with a test light and a hunch. Bookmarked and text-searchable, so you can jump straight to any spec from your phone or tablet and get the loader back on the pile.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 11-35 | Safety Hints, Specifications, Operational Checkout Record Sheet |
| Engine | 36-40 | Structure and Function |
| Power Train System | 41-237 | Power Train Component Overview, Torque Converter, Transmission Layout and Installation, Electro-Hydraulic Shift Control, Operating Modes, Electronic Control Unit, Transmission Disassembly and Assembly |
| Brake System | 238-277 | Brake Hydraulic Circuit, Service Brake Operation, Parking Brake Operation, Brake Valve, Principle of Operation, Brake Tests and Adjustments |
| Steering System | 278-377 | Steering Hydraulic Circuit, Steering Unit, Flow Amplifier, Neutral, Left Turn and Right Turn Operation, Steering Tests and Adjustments |
| Work Equipment | 378-459 | Hydraulic System Outline, Work Equipment Hydraulic Circuit, Main Pump Operation, RCV Lever Positions (Raise, Lower, Float, Dump, Roll, Hold), Cylinder Drift and Cycle Time Tests |
| Electrical System | 460-532 | Component Location, Electrical Circuit, Monitoring System, Electrical Component Specification, Connectors, Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine mounting bolt(6EA) | 100 ± 15 kgf·m | p. 30 |
| Engine mounting bolt(Bracket, rear 8EA) | 10.7 ± 2.1 kgf·m | p. 30 |
| System pressure valve | 16+2 bar | p. 41 |
| Pump | 16+2 bar | p. 41 |
| Converter back pressure valve opening pressure | 3.5 bar | p. 56 |
| System pressure valve maximum control pressure | 16+2 bar | p. 57 |
| Return filter bypass valve set pressure | 1.36kg/cm2 (19.3psi) | p. 406 |
| Accumulator charging pressure of gas | 16kg/cm2 (228psi) | p. 408 |
| Accumulator max actuating pressure | 128kg/cm2 (1820psi) | p. 408 |
| Hydraulic oil filter replacement interval | 250 operating hours | p. 435 |
| Engine Oil Quantity | 20 L | p. 26 |
| Main Relief Valve Pressure | 210 kgf/cm2 | p. 27 |
