Part of the Hyundai Repair Manuals.
All 495 pages of this Hyundai R140LC-7A, R140LCD-7A, R140LCM-7A service manual PDF cover one job: putting your R140-7A hydraulic excavator back to work. You get full hydraulic schematics tracing the main and pilot circuits through single and combined operation, wiring diagrams with connector pinouts and component locations, and a thick troubleshooting section spanning hydraulic, electrical, and mechatronics faults. Step-by-step teardowns walk you through the pump device, main control valve, swing and travel motors, RCV levers, turning joint, and undercarriage. Torque the swing motor mounting bolts to 29.6 ± 3.2 kgf·m and set the main relief valve at 8 to 9 kgf·m (57.8 to 65.1 lbf·ft). A dead travel motor doesn't wait for forum answers. This PDF is bookmarked with a live text layer; search the spec, jump to the page, get back in the cab.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 11-54 | Safety Hints, Specifications |
| Structure and Function | 55-130 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 131-164 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 165-212 | Component Location, Electrical Circuit, Electrical Component Specification, Connectors |
| Mechatronics System | 213-235 | Outline, Mode Selection System, Automatic Deceleration System, Power Boost System, Travel Speed Control System, Automatic Warming Up Function, Engine Overheat Prevention Function |
| Maintenance Standard | 286-320 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 321-481 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 482-495 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Swing motor mounting bolt | 29.6 ± 3.2 kgf·m | p. 326 |
| Carrier roller mounting bolt, nut | 29.7 ± 4.5 kgf·m | p. 326 |
| Track roller mounting bolt | 29.6 ± 3.2 kgf·m | p. 326 |
| Main relief valve tightening torque | 8~9 kgf·m (57.8~65.1 lbf·ft) | p. 362 |
| Overload relief valve tightening torque | 8~9 kgf·m (57.8~65.1 lbf·ft) | p. 362 |
| Hexagon socket bolt (343) | 25.7 ± 4.0 kgf·m (186 ± 28.9 lbf·ft) | p. 387 |
| Tightening torque for turning joint assembly mounting bolt | 12 ± 1.3 kgf·m (88 ± 9.4 lb·ft) | p. 445 |
| Socket head bolt (Bucket cylinder) torque | 23.0 ± 2.0 kgf·m (166 ± 14.5 lbf·ft) | p. 458 |
| Socket head bolt (Boom cylinder) torque | 23.0 ± 2.0 kgf·m (166 ± 14.5 lbf·ft) | p. 458 |
| R140LC-7A | ||
| Operating Weight, R140LC-7A | 13980 kg | p. 21 |
| R140LC-7A, 2-PIECE BOOM | ||
| Operating Weight (R140LC-7A, 2-PIECE BOOM) | 13980 kg | p. 22 |
| R140LCD-7A | ||
| Operating Weight, R140LCD-7A | 14800 kg | p. 23 |
