Part of the Hyundai Repair Manuals.
This 573-page Hyundai R140LC-7, R140LCD-7, R140LCM-7 service manual PDF is the full factory shop book for the -7 series hydraulic excavator, from pump device and main control valve to swing drive, travel motors, and RCV controls. Inside: complete hydraulic circuit schematics for the pilot, main, single, and combined operation circuits, plus electrical wiring diagrams with connector pinouts and component locations. You also get a dedicated troubleshooting section for hydraulic, electrical, and mechatronics faults, self-diagnostics for the mode selection and power boost systems, and page after page of tightening and mounting torque tables. Set parking brake release pressure at 6 kgf/cm2 (0.59 MPa), and confirm the high/low speed changeover pilot kicks in at 20 kgf/cm2 (1.96 MPa). No more chasing pressure faults with a gauge and a hunch. Bookmarked and text-searchable on any device; download it and walk straight to your machine.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 11-54 | Safety Hints, Specifications |
| Structure and Function | 55-156 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 157-191 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 192-245 | Component Location, Electrical Circuit, Electrical Component Specification, Connectors |
| Mechatronics System | 246-284 | Outline, Mode Selection System, Automatic Deceleration System, Power Boost System, Travel Speed Control System, Automatic Warming Up Function, Engine Overheat Prevention Function |
| Maintenance Standard | 343-377 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 378-558 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 559-573 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Parking brake release pressure | 6 kgf/cm² (0.59 MPa) | p. 52 |
| High/low speed changeover pilot pressure | 20 kgf/cm² (1.96 MPa) | p. 141 |
| Secondary pressure | 5 to 20.5 kgf/cm² | p. 145 |
| Bypass relief valve | 1.5 kgf/cm2 | p. 161 |
| Check valve(1) | 3.0 kgf/cm2 | p. 161 |
| Bypass valve | 1.5 kgf/cm2 | p. 162 |
| Relief valve | 35 kgf/cm2 | p. 163 |
| Friction plate braking torque | 49.3kgf·m or more | p. 369 |
| Mating plate maximum allowable braking torque | 49.3kgf·m or less | p. 369 |
| Swing bearing upper part mounting bolt | 41.3 ± 6.2 kgf·m | p. 382 |
| Swing bearing lower part mounting bolt | 31.3 ± 4.7 kgf·m | p. 382 |
| Operating weight | 13980 kg | p. 21 |
