Part of the Hyundai Repair Manuals.
All 487 pages of this Hyundai R235LCR-9 Shop Manual PDF point at one machine: your R235LCR-9 hydraulic excavator, from the pump device to the undercarriage. You get full electrical wiring diagrams with connector pinouts, hydraulic circuit schematics tracing main and pilot flow, and a heavy troubleshooting section that walks the hydraulic, electrical, and mechatronics systems fault by fault. Exploded views back up the disassembly procedures, and the self-diagnostic system is decoded so the monitor panel stops speaking in riddles. Set the main relief valve to 350 kgf/cm2 (4980 psi), 380 with power boost engaged, and keep the 160-liter hydraulic tank topped off before you test. Your excavator is parked and the clock is running. This PDF is bookmarked and text-searchable; jump straight to the spec you need, then get back on the sticks.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 12-34 | Safety Hints, Specifications |
| Structure and Function | 35-113 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 114-151 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 152-203 | Component Location, Electrical Circuit, Electrical Component Specification, Connectors |
| Mechatronics System | 204-260 | Outline, Mode Selection System, Automatic Deceleration System, Power Boost System, Travel Speed Control System |
| Maintenance Standard | 331-365 | Operational Performance Test, Major Components, Main Control Valve, Track and Work Equipment |
| Disassembly and Assembly | 366-472 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 473-487 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main relief valve pressure | 350 kgf/cm2 (4980 psi) | p. 35 |
| Main relief valve pressure (Power boost) | 380 kgf/cm2 (5400 psi) | p. 35 |
| Boom port relief valve pressure | 400 kgf/cm2 (5690 psi) | p. 35 |
| Arm port relief valve pressure | 400 kgf/cm2 (5690 psi) | p. 35 |
| Hydraulic tank capacity | 160 L (42 U.S. gal) | p. 34 |
| Hydraulic system capacity | 275 L (73 U.S. gal) | p. 34 |
| Bypass relief valve opening pressure | 1.5 kgf/cm2 | p. 117 |
| Solenoid valve resistance | 15~25 ohm | p. 175 |
| EPPR valve resistance | 15~25 ohm | p. 175 |
| Track tension cylinder mounting bolt | 29.7 ± 4.5 kgf·m | p. 370 |
| Swing bearing upper part mounting bolt | 100 ± 10 kgf·m | p. 371 |
| Swing bearing lower part mounting bolt | 100 ± 10 kgf·m | p. 371 |
