Part of the Hyundai Repair Manuals.
Need the factory answers for your Hyundai R55-9 crawler excavator? This 412-page Hyundai R55-9 service manual PDF walks you through the pump device, main control valve, swing and travel drives, and RCV lever from teardown to final torque. Inside: full hydraulic circuit schematics covering pilot, single, and combined operation, complete wiring diagrams with connector pinouts, and a heavy troubleshooting section for both hydraulic and electrical faults. You also get maintenance standards with operational performance tests and wear limits for the track and work equipment. Tighten the P1 pump port fittings to 6.0~7.0 kgf·m, and check solenoid valve resistance against the 15-25 Ohm spec before you condemn a coil. No more chasing pilot pressure faults with borrowed numbers. Bookmarked with a live text layer; search any spec, jump to any section, and pull it up on the tablet next to the machine.
What's Inside This Hyundai R55-9 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-23 | Safety Hints, Specifications |
| Structure and Function | 24-80 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever |
| Hydraulic System | 81-114 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 115-170 | Component Location, Monitoring System, Electrical Circuit |
| Troubleshooting | 171-209 | Before Troubleshooting, Hydraulic and Mechanical System, Electrical System Troubleshooting |
| Maintenance Standard | 210-247 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 248-401 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 402-412 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tightening torque for P1, P2, P3, A1-A10, B1-B10, B11 ports | 6.0~7.0 kgf·m | p. 33 |
| Tightening torque for T1, T2 ports | 10~12 kgf·m | p. 33 |
| Maximum allowable viscosity | 1000 mm²/s | p. 30 |
| Minimum allowable viscosity | 10 mm²/s | p. 30 |
| Solenoid valve resistance | 15-25 Ohm | p. 148 |
| Travel solenoid resistance | 15-25 Ω | p. 204 |
| Axial clearance between coupling gear and cover | 0.3 ± 0.1 mm | p. 235 |
| Hydraulic tank quantity | 70 L | p. 255 |
| Operating Weight | 5650 kg | p. 13 |
| Travel Speed (low/high) | 2.2/4.0 km/hr | p. 13 |
| Engine Rated Gross Horse Power | 57.8 Hp | p. 20 |
| Main Pump Maximum Pressure | 220 kgf/cm2 | p. 20 |
Hyundai R55-9 Common Problems This Manual Covers
Hyundai R55-9 hydraulic functions slow and weak, bucket and boom barely move under load
Check the hydraulic oil level first; the tank holds 70 L, and low oil starves the pump. Connect a pressure gauge and test the main pump against the 220 kgf/cm2 spec on page 20. If pressure reads low, adjust or replace the relief valve, then work the troubleshooting charts starting on page 171.
Manual Section: Hydraulic and Mechanical System Troubleshooting p. 171Machine will not travel on one side, track drags or stalls on slopes
Disconnect connector CN-70 with the starting switch off and measure travel solenoid resistance between pins 1 and 2; spec is 15 to 25 ohms on page 204. Replace the solenoid if it reads open or out of range. If electrical checks pass, inspect the drive coupling and final drive gear oil level.
Manual Section: Travel System Troubleshooting p. 204Hydraulic pump whines or growls at operating temperature, implement power drops off suddenly
Check the oil level and inspect suction fittings for air leaks; torque the pump ports to 6.0 to 7.0 kgf·m per page 33. Confirm oil viscosity falls in the 15 to 150 mm²/s range listed on page 30. If the noise stays, tear the pump down and measure piston-to-block clearance; replace parts at 0.050 mm wear, page 231.
Manual Section: Maintenance Standard p. 231Controls dead or intermittent, fuses keep blowing, monitor panel throws random warnings
Test battery voltage under load and clean the chassis ground connections before condemning parts. Check each pilot solenoid coil with a multimeter; a good coil reads 15 to 25 ohms per page 148. Trace intermittent circuits against the wiring diagram and pull stored faults from the error code reference.
Manual Section: Electrical SystemEngine cranks slowly or will not start when temperatures drop below freezing
Load-test the battery and clean both cable ends; slow cranking is almost always voltage drop, not a bad starter. Test the starting switch and safety solenoid circuits next. Verify the crankcase is filled correctly; capacity is 11.6 L on page 20, and overfilled or heavy oil drags down cold cranking speed.
Manual Section: Engine TroubleshootingFrequently Asked Questions
What are the torque specifications for the bucket cylinder piston nut on a Hyundai R55-9?
The tightening torque for the bucket cylinder piston nut (Item 19) is 75 ± 7.5 kgf·m (540 ± 54 lbf·ft). p. 378
What are the torque specifications for the track shoe mounting bolts on a Hyundai R55-9?
The tightening torque for the track shoe mounting bolt and nut is 19.5 ± 2.0 kgf·m (141 ± 14.5 lbf·ft). p. 252
How do I clear hydraulic pressure on a Hyundai R55-9 before service?
Before performing service, lower the work equipment to the ground, stop the engine, and operate the control levers and pedals several times to release the remaining pressure in the hydraulic piping. Additionally, loosen the breather slowly to release pressure inside the hydraulic tank. p. 249
What is the recommended interval for changing the hydraulic oil?
The hydraulic oil should be changed after 2000 hours of operation, and then every 2000 hours of operation or once a year after that. p. 32
What is the standard engine oil quantity for the R55-9?
The engine oil quantity for the R55-9 is 11.6 liters (3.1 U.S. gal). p. 20
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