Part of the Hyundai Repair Manuals.
Every one of the 417 pages in this Hyundai HL750 Service Manual PDF covers one machine: your HL750 wheel loader, from torque converter to bucket cylinder. Inside: hydraulic schematics for the power train, brake, steering, and work equipment circuits, plus wiring diagrams for the starting, charging, illumination, and parking brake circuits. You also get transmission and axle disassembly steps, pump flow and pressure tests, cylinder drift and leakage checks, and troubleshooting charts for every system. Loader won't lift? Check the main relief valve at 210 kg/cm2 (3000 PSI). Pulling a wheel? Torque the mounting nuts back to 60 kg-m (434 lb-ft), not whatever the impact gun feels like. No more chasing hydraulic faults with a gauge and a guess. Bookmarked with a full text layer: type in a spec, jump to the circuit, fix your loader.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-24 | Safety Hints, Specifications (Major Component, Without Tooth and Cutting Edge Type Bucket, Bolt-On Cutting Edge Type Bucket, With Tooth Type Bucket), Weight |
| Engine | 25-31 | Structure and Function, Cooling System, Fuel System, Lubricating System, Intake and Exhaust System |
| Power Train System | 32-142 | Structure and Function (Power Train Component Overview, Hydraulic Schematic, Hydraulic Circuit, Torque Converter, Transmission, Axle, Tire and Wheel) |
| Brake System | 143-188 | Structure and Function (Outline, Hydraulic Circuit, Brake Pump, Brake Valve, Cut-Off Valve, Parking Brake Cylinder, Brake Accumulator, Pressure Switches, Parking Brake) |
| Steering System | 189-253 | Structure and Function (Outline, Hydraulic Circuit, Priority Valve, Steering Valve, Cushion Valve, Steering Cylinder), Operational Checks and Troubleshooting |
| Work Equipment | 254-333 | Structure and Function (Hydraulic System Outline, Hydraulic Circuit, Main Pump Operation, Remote Control Valve, Main Control Valve, Pilot Oil Supply Unit, Safety Valve Unit, Boom and Bucket Cylinder, Hydraulic Oil Tank, Accumulator) |
| Electrical System | 334-409 | Component Location |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main relief valve pressure | 210kg/cm² (3000psi) | p. 16 |
| Overload relief valve pressure | 230~250kg/cm² (3270~3560psi) | p. 16 |
| Tire mounting nut | 60 ± 2 kg·m (434 ± 15 lb·ft) | p. 18 |
| Pipe and hose fitting torque (1/4") | 3 kg·m (21.7 lb·ft) | p. 20 |
| Pipe and hose fitting torque (3/8") | 4 kg·m (28.9 lb·ft) | p. 20 |
| Torque for screws 27, 29 | 31-33 N·m (3.2-3.4 kgf·m / 23-25 lbf·ft) | p. 121 |
| Charging pump bolt torque | 5.2-5.7 kgf·m (37-41 lbf·ft) | p. 119 |
| Cut-in pressure | 120+10 kgf/cm² | p. 161 |
| Cut-off pressure | 150-10 kgf/cm² | p. 161 |
| Temperature of medium | -30 ~ +80°C | p. 161 |
| Ambient temperature | -30 ~ +80°C | p. 161 |
| Parking brake cylinder Release pressure | 80+4 kgf/cm² | p. 163 |
