Part of the Hyundai Repair Manuals.
Need factory data for your Hyundai HL720-3? This 470-page Hyundai HL720-3 service manual PDF covers the whole wheel loader, from torque converter to bucket cylinder. Inside: full hydraulic schematics for the brake, steering, and loader circuits, complete wiring diagrams with connector tables, and step-by-step disassembly procedures for the main pump, transmission, and boom cylinders. You also get troubleshooting charts plus factory test procedures, from cylinder drift checks to pilot pressure tests, so you can diagnose before you tear anything down. Set the loader relief valve between 190 and 200 bar, then torque the engine mounting bolts to 12.8 kgf·m. Your loader is down and every idle hour costs money. Get the factory numbers, not forum guesses. This bookmarked PDF opens on any device; search a spec by keyword, walk to the machine, and start 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, Kg M to Lb Ft, Kg/Cm2 to Lb/In2 |
| General | 9-32 | Safety Hints (Follow Safe Procedure, Wear Protective Clothing, Warn Others of Service Work, Use Handholds and Steps, Prepare for Emergencies, Work in Clean Area, Protect Against Flying Debris, Protect Against Noise, Park Machine Safely, Support Machine Properly, Service Cooling System Safely, Handle Fluids Safely-Avoid Fires, Beware of Exhaust Fumes, Remove Paint Before Welding or Heating, Illuminate Work Area Safely, Service Machine Safely, Stay Clear of Moving Parts, Avoid High Pressure Fluids, Avoid Heating Near Pressurized Fluid Lines, Prevent Battery Explosions, Prevent Acid Burns, Use Tools Properly, Service Tires Safely, Use Proper Lifting Equipment, Dispose of Fluids Properly, Replace Safety Signs, Live with Safety, Keep ROPS Installed Properly) |
| Engine | 33-36 | Structure, Lube Oil Circuit Schematic, Fuel System Schematic, Cooling System Schematic |
| Power Train System | 37-200 | Structure and Function (Power Train Component Overview, Hydraulic Circuit, Torque Converter, Transmission, Electro-Hydraulic Shift Unit, Speed Control Functional Description, Axle, Differential, Torque Proportioning Differential, Final Drive, Tire and Wheel) |
| Brake System | 201-237 | Structure and Function (Outline, Full Power Hydraulic Brake System, Hydraulic Circuit, Brake Pump, Principle of Operation, Brake Valve, Brake Accumulator, Pressure Switches) |
| Steering System | 238-301 | Structure and Function (Outline, Hydraulic Circuit, Priority Valve, Steering Unit, Steering Cylinder), Operational Checks and Troubleshooting |
| Work Equipment | 302-399 | Structure and Function (Hydraulic System Outline, Hydraulic Circuit, Main Pump Operation, Remote Control Valve, Main Control Valve, Safety Valve Unit, Boom and Bucket Cylinder, Hydraulic Oil Tank, Return Oil Filter Bypass Valve, Air Breather, Accumulator) |
| Electrical System | 400-470 | Component Location |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine mounting bolt, nut | 12.8 ± 3.0 kgf·m | p. 18 |
| Radiator mounting bolt, nut | 12.8 ± 3.0 kgf·m | p. 18 |
| Operating pressure (Minimum) | 5.8 kgf/cm² (82.5 psi) | p. 24 |
| Relief pressure | 19~20Mpa (190~200bar, 2760~2900psi) | p. 262 |
| Pressure relief valve setting pressure | 195 ± 5 bar (2830 ± 73 psi) | p. 291 |
| Main relief valve pressure setting | 21 MPa | p. 309 |
| Bucket spool load check valve pressure setting | 24 MPa | p. 309 |
| Pressure reducing valve supply pressure | 30 bar | p. 315 |
| Bypass valve set pressure | 1.36kgf/cm2 (19.3psi) | p. 339 |
| Hydraulic oil filter replacement interval | 250 operating hours | p. 368 |
| Engine Oil Quantity | 14 L | p. 23 |
| Main Pump Maximum Operating Pressure | 210 kgf/cm2 | p. 23 |
