Part of the Hyundai Repair Manuals.
All 507 pages of this Hyundai R370LC-7 Service Manual PDF cover one machine: the R370LC-7 crawler excavator, from main pump and control valve to swing device, travel motors, and undercarriage. Inside you get complete electrical circuit diagrams, full hydraulic schematics with fluid routing, and a heavy troubleshooting section that walks boom, arm, swing, and travel faults back to the failed component. The mechatronics chapters explain the self-diagnostic system, power boost, and auto-deceleration so you can read what the machine is telling you. Set the pilot relief valve at 35 kgf/cm2 and confirm both 12V 160Ah batteries before chasing electrical gremlins. Machine down and the clock running? Get factory numbers, not forum guesses. Bookmarked with a full text layer; jump to a section or search any spec, on any device in the shop.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 9-38 | Safety Hints, Specifications |
| Structure and Function | 39-124 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 125-156 | Hydraulic Circuit |
| Electrical System | 157-204 | Component Location, Electrical Circuit |
| Mechatronics System | 205-241 | Mode Selection System, Automatic Deceleration System, Power Boost System, Travel Speed Control System, Engine Overheat Prevention System, Self-Diagnostic System |
| Troubleshooting | 242-297 | Hydraulic and Mechanical System, Electrical System, Mechatronics System, Boom or Arm Action, Swing Motion, Travel Speed Control |
| Maintenance Standard | 298-335 | Main Pump, Main Control Valve, Swing Device, Travel Motor, Work Equipment |
| Disassembly and Assembly | 336-492 | Pump Device, Main Control Valve, Swing Device, Travel Device, Boom Arm and Bucket Cylinder, Undercarriage |
| Component Mounting Torque | 493-507 | Engine System, Electric System, Hydraulic System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| bypass relief valve opening pressure | 1.5kgf/cm2 (21psi) | p. 128 |
| pilot relief valve setting pressure | 35kgf/cm2 | p. 130 |
| drain oil pressure bypass setting | 1.5kgf/cm2 (21psi) | p. 129 |
| Battery | 12V 160Ah | p. 178 |
| Pressure gauge capacity | 0 to 40-50 kgf/cm² (0 to 580-725 psi) | p. 227 |
| EPPR valve pressure specification | 2-25 kgf/cm² (30-350 psi) | p. 227 |
| Swing motor mounting bolt | 100±15 kgf·m | p. 340 |
| Main pump housing mounting bolt | 4.8±0.3 kgf·m | p. 340 |
| Main pump mounting socket bolt | 42±4.5 kgf·m | p. 340 |
| Track tension cylinder mounting bolt | 29.6±3.2 kgf·m | p. 340 |
| Swing motor mounting bolt (Item 11) | 100 ± 15 kgf·m | p. 499 |
| Adjust component mounting bolt (Item 3) | 13.3 ± 2.7 kgf·m | p. 502 |
