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Part of the Hyundai Repair Manuals.
All 414 pages of this Hyundai R55W-7A shop manual PDF are dedicated to one machine: the R55W-7A wheeled hydraulic excavator, from the pump device to the rear axle. You get full hydraulic schematics tracing the main and pilot circuits, electrical circuit diagrams with connector pinouts and component locations, and troubleshooting charts for both hydraulic and electrical faults. Open the disassembly and assembly section and follow step-by-step teardowns of the main control valve, swing device, travel motor, gear box, steering valve, and both axles. Set the main relief valve to 220 kgf/cm2 (3130 psi) and torque the P1 pump port fitting to 6.0 to 7.0 kgf·m; the numbers are all here. No more chasing pilot pressure problems with borrowed guesses. Bookmarked, with a full text layer: type a spec, jump to the page, and get your excavator digging again.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-21 | Safety Hints, Specifications |
| Structure and Function | 22-83 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal, Brake Pedal, Gear Box |
| Hydraulic System | 84-113 | Hydraulic Circuit, Main Circuit, Pilot Circuit |
| Electrical System | 114-166 | Component Location, Monitoring System, Electrical Circuit |
| Troubleshooting | 167-203 | Before Troubleshooting, Hydraulic and Mechanical System |
| Maintenance Standard | 204-233 | Operational Performance Test, Major Component |
| Disassembly and Assembly | 234-394 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Gear Box, Steering Valve |
| Component Mounting Torque | 395-414 | Introduction Guide, Engine System, Electric System, Power Train, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main relief valve pressure | 220kgf/cm2 (3130psi) | p. 16 |
| Overload relief valve pressure | 240kgf/cm2 (3410psi) | p. 16 |
| Tightening torque for P1, P2, P3, A1-B9 ports | 6.0~7.0 kgf·m | p. 30 |
| Tightening torque for A10, B10, B11 ports | 6.0~7.0 kgf·m | p. 30 |
| Filter filtration accuracy | 10 μm or less | p. 27 |
| Filter change interval | 500 hours | p. 28 |
| Hydraulic oil viscosity range (recommended) | 15 ~ 150 mm²/s | p. 27 |
| Hydraulic oil viscosity range (maximum allowable) | 1000 mm²/s | p. 27 |
| Pilot circuit relief valve setting pressure | 30kgf/cm2 | p. 88 |
| Solenoid valve resistance | 15~25 Ω | p. 143 |
| Clearance between piston outside dia and cylinder block inside dia | 0.050mm | p. 222 |
| Axial play of the piston and piston shoe | 0.2mm | p. 222 |
