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Part of the Hyundai Repair Manuals.
All 689 pages of this Hyundai R170W-7 shop manual PDF are aimed at one machine: the R170W-7 wheel excavator, from the main pump down to the bucket pins. You get full hydraulic circuit schematics covering main, pilot, single and combined operation, plus complete wiring diagrams with component locations and connector pinouts. Inside: a full troubleshooting section, operational performance tests, and step-by-step disassembly and assembly procedures for the main pump, control valve, swing motor, travel transmission, axles, steering, and every cylinder on the machine. Pull the transmission mounting bolts to 49.2 to 66.6 kgf·m (356 to 481 lbf·ft), and keep operating pressure between 6.5 kg/cm² (92 psi) and 26 kg/cm² (370 psi). No more chasing hydraulic gremlins through forum threads. Bookmarked and text-searchable; open it on your phone at the machine and jump straight to the spec.
What's Inside This Hyundai R170W-7 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-24 | Safety Hints, Specifications |
| Structure and Function | 25-119 | Pump Device, Main Control Valve, Swing Device, Travel Device |
| Hydraulic System | 120-152 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 153-206 | Component Location, Electrical Circuit, Electrical Component Specification, Connectors |
| Mechatronics System | 207-245 | Outline |
| Maintenance Standard | 302-330 | Operational Performance Test, Major Components, Work Equipment |
| Precautions and Tightening Torque | 331-343 | Removal Work, Installation Work, Tightening Torque, Tools |
| Pump Device | 344-360 | Main Pump Disassembly, Regulator Disassembly, Main Pump Assembly, Regulator Assembly |
| Main Control Valve | 361-374 | Main Control Valve Removal, Main Control Valve Installation, Spool Disassembly, Holding Valve Disassembly, Main Relief Valve |
| Swing Device | 375-387 | Swing Motor Removal, Swing Motor Disassembly, Swing Motor Assembly, Reduction Gear Disassembly, Reduction Gear Assembly |
| Travel Motor and Transmission | 388-443 | Travel Motor Removal, Transmission Disassembly, Planetary Drive Disassembly, Declutch Unit Disassembly, Gear Box Control |
| Axle and Steering | 444-572 | Front Axle Removal, Rear Axle Removal, Differential Disassembly, Steering Assembly, Brake Lining Wearing Test |
| Cylinders and Work Equipment | 573-659 | Bucket Cylinder Removal, Arm Cylinder Removal, Boom Cylinder Removal, Dozer Cylinder Removal, Bucket Assembly |
| Component Mounting Torque | 660-689 | Introduction Guide, Engine System, Electric System, Hydraulic System, Power Train System, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Minimum operating pressure | 6.5kg/cm² (92psi) | p. 22 |
| Maximum operating pressure | 26kg/cm² (370psi) | p. 22 |
| Motor device weight | 61kg (135lb) | p. 375 |
| Reduction gear device weight | 180kg (396lb) | p. 388 |
| Tightening torque | 49.2~66.6kgf·m (356~481lbf·ft) | p. 388 |
| Tightening torque for M6x1.0 (Item 1, Hydraulic Components Mounting 1) | 1.05±0.2 kgf·m | p. 665 |
| Tightening torque for M6x1.0 (Item 2, Hydraulic Components Mounting 1) | 1.44±0.3 kgf·m | p. 665 |
| Engine oil quantity | 16.5 L | p. 20 |
| Main relief valve pressure | 330 kgf/cm2 | p. 20 |
| Swing speed | 11.5 rpm | p. 21 |
| Engine model | Mitsubishi S6S-DT | p. 20 |
| Battery capacity | 2 x 100 Ah | p. 20 |
Hyundai R170W-7 Common Problems This Manual Covers
Hyundai R170W-7 swing speed low or swing motion impossible, upperstructure creeps after stopping
Check swing motor relief pressure first; it should hold 240 kgf/cm2 before you blame the motor. Verify swing speed against the 11.5 rpm spec on page 21. If pressure and speed both fail, remove the swing motor (61 kg, rig a hoist) and inspect pistons, springs, and plates following the teardown on page 375.
Manual Section: Swing Device p. 375Hydraulic oil leaking at hose fittings, system pressure drops, boom and arm feel weak
Wipe every fitting dry and run the machine to find the weeper. Retorque loose M8 hose connections to 2.5 kgf·m per the chart on page 665; do not just crank them tighter. Replace any seal that keeps seeping, then top the tank back up to its 160 L capacity with clean oil.
Manual Section: Component Mounting Torque p. 665Engine won't start or shuts down right after firing, oil pressure warning lamp on
Check the dipstick before anything else; this engine holds 16.5 L of oil, and a low or diluted crankcase will shut it down on the pressure sensor. Verify both 100 Ah batteries, the starting switch, and the safety solenoid. If oil and electrics check out, follow the no-start procedures starting.
Manual Section: Electrical System TroubleshootingHydraulic oil cloudy and milky, pump whines under load, all functions slow when warm
Drain the hydraulic tank completely and refill all 160 L with clean oil of the correct grade; milky oil means water or air, and the whine is cavitation eating the pump. Inspect suction lines for loose clamps pulling air. Run the cavitation and overheating checks in the troubleshooting procedures before condemning the pump.
Manual Section: Hydraulic and Mechanical System TroubleshootingWeak digging force, boom and arm stall under load, engine sounds fine
Test main relief pressure at the pump; spec is 330 kgf/cm2. Low readings point to a worn relief valve or main pump, not the cylinders. Check pump delivery against the rated 2 x 168 L/min. Adjust or rebuild the main relief valve using the control valve procedures starting on page 361.
Manual Section: Main Control Valve p. 361Frequently Asked Questions
How do I delete all recorded error codes from the CPU controller memory on the Hyundai R170W-7?
To delete all recorded error codes, select the recorded error (TIME Er) display on the cluster. Press the engine and select switch simultaneously for 2 seconds or more. The cluster display will change to 'TIME Er : 00', indicating that all recorded error codes have been deleted from the memory. p. 219
What is the tightening torque for the swing motor mounting bolts on the Hyundai R170W-7?
The tightening torque for the swing motor mounting bolts (M20 x 2.5) is 57.9 ± 8.7 kgf·m (419 ± 62.9 lbf·ft). p. 335
What are the common error codes for the Hyundai R170W-7?
The manual lists error codes from 1 to 58. For example, error code 1 indicates a short circuit in the accel actuator system, error code 3 indicates a short circuit in the pump EPPR valve system, and error code 36 indicates a communication error with the cluster. p. 220
What is the standard engine speed for the R170W-7 in M mode?
The standard engine speed for the R170W-7 in M mode is 2200 ± 50 rpm, with the accel dial set at the 10 (Max) position. p. 306
What is the procedure for bleeding air from the hydraulic pump after installation?
After adding oil to the hydraulic tank, remove the air vent plug (2EA) on the pump. Tighten the plug lightly, start the engine at low idling, and check until oil comes out from the plug. Finally, tighten the plug fully. p. 339
What format is this Hyundai R170W-7 manual in?
Instant PDF download. You get the full 689-page searchable Shop Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Is this Hyundai R170W-7 Shop Manual printable?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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