Part of the Hyundai Repair Manuals.
Need real factory data for your Hyundai R450LC-7A, R500LC-7A? This service manual PDF packs 526 pages of specs, circuits, and rebuild procedures for both hydraulic excavators. You get complete electrical wiring circuits with connector pinouts and component locations, hydraulic schematics tracing the main and pilot circuits through single and combined operation, and a full troubleshooting section covering hydraulic, electrical, and mechatronics faults. Open to the disassembly chapter and follow step-by-step teardowns of the pump device, main control valve, swing and travel motors, cylinders, and undercarriage. Set the main relief valve at 330 kgf/cm2 with power boost off; if pilot functions feel weak, check the pilot relief against its 35 kgf/cm2 spec. Your machine is down and the clock is running. Bookmarked and keyword-searchable, this PDF opens on any device; download it and take it straight to the excavator.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 11-60 | Safety Hints, Specifications |
| Structure and Function | 61-138 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 139-164 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 165-212 | Component Location, Electrical Circuit, Electrical Component Specification, Connectors |
| Mechatronics System | 213-264 | Outline, Mode Selection System, Monitoring System |
| Maintenance Standard | 315-348 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 349-510 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 511-526 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bypass check valve setting pressure | 5.0kgf/cm2 (71psi) | p. 142 |
| Pilot relief valve setting pressure | 35kgf/cm2 | p. 144 |
| Temperature sensor (Hydraulic) resistance at 50°C | 804 Ω | p. 186 |
| Temperature sensor (Hydraulic) resistance at 80°C | 310 Ω | p. 186 |
| Main relief valve set pressure (Power boost OFF) | 330kgf/cm2 | p. 220 |
| Main relief valve set pressure (Power boost ON) | 360kgf/cm2 | p. 220 |
| Actuator operating voltage | 0~1V | p. 310 |
| Hydraulic oil temperature for testing | 50±5°C | p. 333 |
| Travel motor mounting bolt | 57.9 ± 8.7 kgf·m (419 ± 62.9 lbf·ft) | p. 518 |
| Main pump mounting bolt | 44 ± 0.6 kgf·m (318 ± 47.7 lbf·ft) | p. 353 |
| Locking screw (Item 11) | 1.0 kgf·m (7.4 lbf·ft) | p. 419 |
| Tightening torque for Main pump mounting bolts (M20x2.5) | 46±5.1 kgf·m | p. 517 |
