Part of the Hyundai Repair Manuals.
Wrenching on an R320 excavator? This 516-page Hyundai R320LC-7A, R320NLC-7A shop manual PDF covers the LC, NLC, and NLC High Walker variants from safety hints all the way to component mounting torque. You get full hydraulic circuit schematics tracing main and pilot flow through the pump, main control valve, swing, and travel devices, plus electrical wiring diagrams with connector pinouts and component specifications. Inside: self-diagnostic error codes for the mechatronics system, a full troubleshooting section, and step-by-step disassembly procedures for cylinders, turning joint, and undercarriage. Fill the hydraulic system to 320 L, and set the pilot relief valve at 35 kgf/cm2 before you blame the pump. No more chasing pressure faults with a gauge and a guess. Bookmarked, text-searchable, and readable on any device; download it, walk to the machine, and get to work.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-41 | Safety Hints, Specifications |
| Structure and Function | 42-121 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 122-153 | Hydraulic Circuit, Main Circuit, Pilot Circuit |
| Electrical System | 154-202 | Component Location, Electrical Circuit, Electrical Component Specification |
| Mechatronics System | 203-256 | Outline, Mode Selection System, Self-Diagnostic System |
| Maintenance Standard | 307-341 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 342-493 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 494-516 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic tank capacity | 210 L (55.5 U.S. gal) | p. 41 |
| Hydraulic system capacity | 320 L (84.5 U.S. gal) | p. 39 |
| Battery | 2 x 12V x 160Ah | p. 34 |
| bypass relief valve opening pressure | 1.5kgf/cm2 | p. 125 |
| pilot circuit relief valve pressure | 35kgf/cm2 | p. 127 |
| Voltage | 10~12.5V | p. 157 |
| Pressure switch (Travel, working) operating pressure | 10kgf/cm2 | p. 174 |
| Cassette radio voltage | 20-25V | p. 179 |
| Washer pump contact resistance | 10.7Ω | p. 179 |
| Swing motor mounting bolt torque | 58.4 ± 6.4 kgf·m | p. 345 |
| Socket head bolt (Bucket cylinder, Item 22, M18) | 32.0±3.0 kgf·m (232±21.7 lbf·ft) | p. 470 |
| Socket head bolt (Boom cylinder, Item 22, M20) | 46.5±5.0 kgf·m (336±36.2 lbf·ft) | p. 470 |
