Part of the Hyundai Repair Manuals.
Looking for the Hyundai R140W-7A shop manual PDF? This 620-page factory shop manual walks you through the entire Wheel Excavator: main pump, control valve, swing device, travel motor, transmission, steering, and every work equipment cylinder. You get hydraulic schematics tracing the main and pilot circuits, wiring diagrams with component locations and connector pinouts, and a full troubleshooting section covering hydraulic, electrical, and mechatronics faults, including the self-diagnostic system. Disassembly chapters break each component down step by step, from the pump regulator to the counter-balance valve. Set the bypass check valve at 4.5 kgf/cm2 (64 psi) and keep the overload relief valve under its 390 kgf/cm2 limit. Your machine is parked and the clock is running. Bookmarked chapter by chapter; type a spec, jump to the page, and get back on the sticks.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 12-36 | Safety Hints, Specifications |
| Structure and Function | 37-116 | Pump Device, Main Control Valve, Swing Device, Travel Motor, Rcv Lever, Accelerator Pedal, Brake Pedal, Transmission |
| Hydraulic System | 117-149 | Hydraulic Circuit, Main Circuit, Pilot Circuit |
| Electrical System | 150-204 | Component Location, Electrical Circuit, Electrical Component Specification |
| Mechatronics System | 205-238 | Outline, Mode Selection System |
| Maintenance Standard | 289-317 | Operational Performance Test, Major Components, Track and Work Equipment |
| Precautions and Tightening Torque | 318-324 | Removal Work, Installation Work, Tightening Torque, Pipe and Hose Connections |
| Pump Device | 325-347 | Main Pump Removal, Main Pump Installation, Regulator Disassembly, Regulator Assembly |
| Main Control Valve | 348-361 | Control Valve Removal, Control Valve Installation, Spool Disassembly, Holding Valve Assembly |
| Swing Device | 362-382 | Swing Motor Removal, Swing Motor Disassembly, Swing Motor Assembly, Reduction Gear Disassembly |
| Travel Motor | 383-406 | Travel Motor Removal, Motor Unit Structure, Control Unit Disassembly, Counter-Balance Valve |
| Transmission | 407-460 | Transmission Removal, Output Disassembly, Brake and Clutch Reassembly, Downshift Interlock |
| Steering Valve and Cylinder | 461-525 | Steering Valve Removal, Steering Valve Disassembly, Steering Cylinder Removal, Steering Cylinder Assembly |
| Work Equipment and Cylinders | 526-604 | Differential Unit Removal, Bevel Pinion Removal, Bucket Cylinder Disassembly, Boom Cylinder Assembly |
| Component Mounting Torque | 605-620 | Introduction Guide, Engine System, Electric System, Power Train System, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bypass check valve (1) setting pressure | 4.5kgf/cm2 (64psi) | p. 120 |
| Bypass check valve (2) setting pressure | 3.0kgf/cm2 (43psi) | p. 120 |
| Overload relief valve pressure limit | 390kgf/cm2 | p. 141 |
| Slipper ring clearance | 1.5mm | p. 315 |
| Seal set wear limit | 1.5mm | p. 315 |
| Engine mounting bolt (Bracket-Frame, FR) | 30±3.5 kgf·m | p. 323 |
| Engine mounting bolt (Engine-Bracket) | 10.0±1.0 kgf·m | p. 323 |
| Main relief valve tightening torque | 8~9 kgf·m (57.8~65.1 lbf·ft) | p. 360 |
| Overload relief valve tightening torque | 8~9 kgf·m (57.8~65.1 lbf·ft) | p. 360 |
| Engine oil quantity | 18.5 L | p. 32 |
| Main pump maximum pressure | 330 kgf/cm2 | p. 32 |
| Swing motor relief pressure | 240 kgf/cm2 | p. 33 |
