Part of the Hyundai Repair Manuals.
Wrenching on a Hyundai Robex hydraulic excavator? This 480-page shop manual PDF covers the 320-3, 320LC-3, and 320NLC-3, from pump device to final drive. Inside: a high-detail hydraulic section tracing main and pilot circuits through every combined operation, plus full electrical coverage with wiring circuits, connector layouts, and monitoring system diagnostics. You also get a mechatronics chapter that decodes mode selection, auto deceleration, and power boost, then troubleshooting charts, tightening torques, and operational performance tests to prove your repair worked. Each main pump moves 130 cc/rev at up to 320 kg/cm2 (4,550 psi); check your rated flow against 2 x 260 L/min before condemning a pump. No more chasing pilot pressure faults on forum guesses. Bookmarked with a live text layer, this PDF opens on any device; search a spec, find the number, get back in the seat.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-47 | Safety, Specification |
| Structure and Function | 48-131 | Pump Device, Main Control Valve, Swing Device, Travel Device |
| Hydraulic System | 132-161 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Combined Operation |
| Electrical System | 162-199 | Component Location, Electrical Circuit, Monitoring System, Electrical Component Specification, Connectors |
| Mechatronics System | 200-230 | Outline, Mode Selection System, Automatic Deceleration System, Engine Speed Up Down Function, Power Boost System, Engine Speed Sensing Function, Battery Charge Warning Function |
| Troubleshooting | 231-288 | Before Troubleshooting, Hydraulic and Mechanical System |
| Maintenance Standard | 289-326 | Operational Performance Test |
| Disassembly and Assembly | 327-480 | Precautions, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Boom Arm and Bucket Cylinder, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Battery | 2 x 12V x 160Ah | p. 43 |
| Alternator | DAC HC60(24V-60AMP) | p. 43 |
| Main pump capacity | 2 x 130cc/rev | p. 43 |
| Main pump maximum pressure | 320kg/cm2 (4550psi) [350kg/cm2 (4980psi)] | p. 43 |
| Alternator check contact | 0.2 Ω (for terminal B+ - I) | p. 196 |
| Hydraulic oil temperature | 105 ± 2°C | p. 246 |
| Track roller mounting bolt | 54.7 ± 6.0 kgf·m | p. 330 |
| Swing bearing upper part mounting bolt | 97.8 ± 10 kgf·m | p. 330 |
| Swing bearing lower part mounting bolt | 97.8 ± 10 kgf·m | p. 330 |
| Mounting bolt | 58.4kgf·m (422.4lb·ft) | p. 383 |
| ROBEX 320-3 | ||
| Operating weight, ROBEX 320-3 | 30150 kg | p. 18 |
| ROBEX 320LC-3 | ||
| Operating weight, ROBEX 320LC-3 | 31200 kg | p. 19 |
