Part of the Hyundai Repair Manuals.
All 487 pages of this Hyundai R55W-9 shop manual PDF focus on one machine: the R55W-9 wheel excavator, from pump device to axle. Inside you get full hydraulic circuit diagrams covering the main and pilot circuits plus single and combined operations, a complete electrical section with circuit drawings, connector layouts, and monitoring system coverage, and page after page of disassembly and assembly procedures for the pump, main control valve, swing and travel devices, gear box, and steering valve. Troubleshooting charts walk you through hydraulic, electrical, and axle faults step by step. Set the T1 hydraulic fitting to 10~12 kgf·m, the port fittings to 6.0~7.0 kgf·m, and swap filters every 500 hours. Chasing a wiring fault without a diagram is a losing game. Bookmarked with a live text layer; jump to any section or search any spec, right from the shop floor.
What's Inside This Hyundai R55W-9 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-21 | Safety Hints, Specifications |
| Structure and Function | 22-88 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal, Brake Pedal, Gear Box |
| Hydraulic System | 89-118 | Hydraulic Circuit, Main Circuit, Pilot Circuit |
| Electrical System | 119-179 | Component Location, Monitoring System, Electrical Circuit |
| Troubleshooting | 180-202 | Before Troubleshooting, Hydraulic and Mechanical System, Axle |
| Maintenance Standard | 203-232 | Operational Performance Test, Major Components |
| General Precautions and Tightening Torque | 233-240 | Removal Work, Install Work, Completing Work, Tightening Torque Chart |
| Pump Device | 241-270 | Removal and Install, Structure, Disassembly, Assembly, Tools and Tightening Torque |
| Main Control Valve | 271-285 | Removal and Install, Structure, Disassembly, Inspection, Assembly |
| Swing Device | 286-306 | Removal and Install, Structure, Disassembly, Assembly, Swing Reduction Gear |
| Travel Motor | 307-330 | Removal and Install, Motor Unit Structure, Control Unit, Counter-Balance Valve, Sealing |
| Gear Box | 331-357 | Removal and Install, Structure, Disassembly, Assembly, Gearshift Cylinder |
| Steering Valve | 359-379 | Removal and Install, Structure, Disassembly, Assembly, Dual Shock Valve |
| Axle and Work Equipment | 380-467 | Axle Removal, Differential Disassembly, Steering Cylinder, Bucket Assembly, Arm Assembly, Boom Cylinder |
| Component Mounting Torque | 468-487 | Introduction Guide, Engine System, Electric System, Power Train, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Battery | 1 x 12V x 100Ah | p. 17 |
| P1, P2, P3, A1, B1, A2, B2, A4, B4, A5, B5, A6, B6, A7, B7, A8, B8, A9, B9, A10, B10, B11, T2 tightening torque | 6.0~7.0 kgf·m | p. 31 |
| T1 tightening torque | 10~12 kgf·m | p. 31 |
| Filter change interval | 500 hours | p. 29 |
| Bypass relief valve opening pressure | 1.5 kgf/cm2 | p. 92 |
| Fuse 1 | 30A | p. 137 |
| Fuse 2 | 20A | p. 137 |
| Engine mounting bolt (engine-Bracket) | 6.9±1.0 kgf·m | p. 237 |
| Engine mounting bolt (bracket-Frame) | 25±2.5 kgf·m | p. 237 |
| Operating weight | 5550 kg | p. 13 |
| Travel speed (High) | 30 km/hr | p. 13 |
| Engine oil quantity | 11.6 L | p. 18 |
Hyundai R55W-9 Common Problems This Manual Covers
Hyundai R55W-9 boom, arm, and bucket movement slow, weak, or jerky, cylinders struggle under load
Check the hydraulic oil level and condition first; check the tank level against the capacity in the General specifications. Milky or dark oil means contamination, change it and the filters. Work through the power weak chart on page 185. Test main pump relief pressure against the spec in the General specifications; low readings mean pump wear, see the service procedures on page 245.
Manual Section: Attachment System Troubleshooting p. 185Boom drops slowly with controls in neutral, machine won't hold a load overnight
Check the gland for external leaks first. Internal piston seal leakage is the usual cause: reseal the boom cylinder, torque the gland and piston nut to the values in the work equipment tightening-torque chart. If drift continues with the hoses capped, inspect the main control valve for spool leakage (page 271).
Manual Section: Axle and Work Equipment p. 456Machine loses travel power on grades, travels unevenly, top speed way down
Verify travel motor relief pressure against the General specifications before pulling anything apart. Check high-range travel speed on a flat surface; the spec is 30 km/hr (page 13). If pressure is good but travel stays weak, follow the counter-balance valve and motor unit checks in the travel motor section starting on page 307.
Manual Section: Travel Motor p. 307Electrical gremlins: dead battery, blown fuses, monitor flickers, engine cranks over slow
Load-test the battery; the machine runs a single 12V 100Ah unit (page 17). Check the 30A start key fuse and the 20A alt/start fuse listed on page 152. Clean and tighten the ground connections at the frame. If the cluster shows fault codes, look them up before replacing parts.
Manual Section: Electrical System Troubleshooting p. 137Hydraulic oil runs hot and looks cloudy, pumps whine steadily under load
Check oil level and filter condition; replace hydraulic filters every 500 hours (page 29). Cloudy oil means water or air contamination: drain the tank, flush, and refill to the specified capacity. Follow the oil temperature high and cavitation charts on page 185. A clogged return filter forces oil past the 1.5 kgf/cm2 bypass relief unfiltered (page 92).
Manual Section: Hydraulic and Mechanical System Troubleshooting p. 185Frequently Asked Questions
What does error code 105 FMI 0 mean on the Hyundai R55W-9A excavator?
Error code 105 FMI 0 indicates that the working pressure sensor data is above the normal range or that there is an open circuit. p. 133
What is the replacement interval for the hydraulic filter?
The hydraulic filter should be changed after the initial startup, after 500 hours of operation, and every 500 hours of operation thereafter. If abnormal fouling is observed during daily checks before the first filter change, the cause must be identified and the interval should not be extended. p. 29
What is the engine oil capacity for the R55W-9?
The engine oil capacity for the Yanmar 4TNV98-EPHYBU engine is 11.6 liters (3.1 U.S. gallons). p. 18
What is the tightening torque for the main pump mounting bolts?
The tightening torque for the main pump mounting bolts is 12.3 ± 3.0 kgf·m (92 ± 22.0 lbf·ft). p. 237
What is the standard travel speed for the R55W-9?
The travel speed for the R55W-9 is 11.3 km/hr (7.0 mph) for low speed and 30 km/hr (18.6 mph) for high speed. p. 13
How will I receive this Hyundai R55W-9 Shop Manual?
Immediate download of the complete 487-page searchable Shop Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Am I able to print pages from this Hyundai R55W-9 manual?
You can. The PDF is unlocked and carries no copy protection, so print the sections you want and keep the file as your backup.
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