Part of the Hyundai Repair Manuals.
Need the factory answer for your Hyundai R320LC-9 or R320NLC-9 hydraulic excavator? This 541-page Hyundai R320LC-9, R320NLC-9 shop manual PDF covers the pump device, main control valve, swing and travel drives, and the R320LC-9 High Walker variant. You get hydraulic circuit schematics tracing main and pilot lines, full electrical wiring diagrams with connector pinouts, and a thick troubleshooting section spanning hydraulic, electrical, and mechatronics faults. Open the disassembly chapters and follow step-by-step teardowns for the swing device, travel motor, turning joint, and boom, arm, and bucket cylinders. Set the main relief valve at 350 kgf/cm2 (4980 psi) and confirm pilot relief pressure hits 40 kgf/cm2 before you button it up. No more chasing hydraulic faults with a gauge and a hunch. Bookmarked by system and keyword-searchable; jump to the spec, then get back on the sticks.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 11-41 | Safety Hints, Specifications |
| Structure and Function | 42-120 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 121-152 | Hydraulic Circuit, Main Circuit, Pilot Circuit |
| Electrical System | 153-203 | Component Location, Electrical Circuit, Connectors |
| Mechatronics System | 204-260 | Outline, Mode Selection System, Monitoring System |
| Maintenance Standard | 328-362 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 363-525 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 526-541 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Main relief valve pressure | 350 kgf/cm2 (4980 psi) [380 kgf/cm2 (5400 psi)] | p. 38 |
| Remote control valve operating pressure (Minimum) | 6.5 kg/cm2 (92 psi) | p. 39 |
| Remote control valve operating pressure (Maximum) | 26 kg/cm2 (370 psi) | p. 39 |
| Bypass relief valve opening pressure | 1.5 kgf/cm2 | p. 124 |
| System pressure regulator relief setting (Boom, Arm, Bucket) | 350(380)±10 kgf/cm2 | p. 348 |
| System pressure regulator relief setting (Travel) | 350±10 kgf/cm2 | p. 348 |
| Main relief valve (601) tightening torque | 7.0 ~ 8.1 kgf·m | p. 411 |
| Socket head bolt (Bucket cylinder, item 23) | 32.0±3.0 kgf·m | p. 502 |
| Socket head bolt (Boom cylinder, item 23) | 46.0±5.0 kgf·m | p. 502 |
| Engine oil quantity | 35 L | p. 37 |
| R320LC-9 | ||
| Operating weight, R320LC-9 | 32200 kg | p. 22 |
| R320NLC-9 | ||
| Operating weight, R320NLC-9 | 32000 kg | p. 23 |
