Part of the Hyundai Repair Manuals.
Wrenching on a Hyundai R170W-3? This Hyundai R170W-3 service manual PDF packs 684 pages of factory procedures for the wheel excavator, from the main pump to the outrigger cylinders. You get full hydraulic circuit schematics with pilot and main circuit routing, complete electrical wiring diagrams with component locations, and a deep troubleshooting section covering hydraulic and electrical faults through the Hyper Dat diagnostic system. Disassembly and assembly steps walk you through the main pump, control valve, swing motor, reduction gear, steering valve, front and rear axles, and every work equipment cylinder. The bypass relief valve opens at 1.5 kg/cm2, and the electrical side runs 12V x 120Ah batteries with a Delco Remy 28MT starter. Your excavator is down. Get factory numbers, not forum guesses. Bookmarked with a full text layer; type a spec, jump straight to it, and get back to work.
What's Inside This Hyundai R170W-3 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-44 | Safety, Specification |
| Structure and Function | 45-124 | Pump Device, Main Control Valve, Swing Device, Travel Motor |
| Hydraulic System | 125-155 | Hydraulic Circuit, Main Circuit, Pilot Circuit |
| Electrical System | 156-216 | Component Location, Electrical Circuit, Monitoring System |
| Mechatronics System | 217-248 | Mode Selection System, Engine Control System |
| Troubleshooting | 249-326 | Before Troubleshooting, Hydraulic and Mechanical System, Electrical System by Hyper Dat |
| Maintenance Standard | 327-355 | Operational Performance Test, Work Equipment |
| General Precautions and Installation Work | 356-361 | Removal Work, Installation Work, Cork Dimensions, Tightening Torque, Pipe and Hose Fittings |
| Pump Device | 362-387 | Removal and Install, Main Pump Structure, Main Pump Disassembly, Main Pump Assembly, Pressure Setting |
| Main Control Valve | 388-403 | Removal and Install, Main Control Valve Structure, Plunger Disassembly, Main Relief Assembly, Arm Regeneration Valve |
| Swing Device | 404-420 | Swing Motor Removal, Swing Motor Structure, Swing Motor Disassembly, Swing Motor Assembly, Swing Parking Brake |
| Reduction Gear | 421-442 | Reduction Gear Removal, Reduction Gear Disassembly, Reduction Gear Assembly, Planetary Carrier, Final Drive |
| Steering Valve and Axle | 443-659 | Steering Valve Disassembly, Steering Valve Assembly, Front Axle Removal, Rear Axle Removal, Differential Disassembly, Final Drive Disassembly |
| Work Equipment Cylinders | 660-684 | Bucket Cylinder, Arm Cylinder, Boom Cylinder, Dozer Cylinder, Outrigger Cylinder, Cylinder Disassembly and Assembly |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bypass relief valve opening pressure | 1.5kg/cm2 | p. 129 |
| Return filter bypass relief valve opening pressure | 1.5kg/cm2 | p. 128 |
| Drain line check valve opening pressure | 1.5kg/cm2 | p. 129 |
| Battery | 12V x 120Ah | p. 188 |
| Starter | Delco Remy 28MT 24V | p. 195 |
| Main control valve section socket bolt torque | 10kgf\u00b7m (72.3lbf\u00b7ft) | p. 391 |
| Socket head bolt (125) torque | 3.0 \u00b1 0.3 kgf\u00b7m (21.7 \u00b1 2.2 lbf\u00b7ft) | p. 456 |
| Dozer cylinder weight | 62kg(140lb) | p. 667 |
| Engine Oil Quantity | 11L | p. 40 |
| Main Pump Rated Oil Flow | 2 x 165 L/min | p. 40 |
| Main Relief Valve Pressure (Power Boost) | 350 kg/cm2 | p. 41 |
| Swing Motor Relief Pressure | 240 kg/cm2 | p. 41 |
Hyundai R170W-3 Common Problems This Manual Covers
Hyundai R170W-3 boom lifts slowly and bucket feels weak under load after hydraulic filter change
Check hydraulic oil level and condition before pulling anything apart. Test main relief pressure against the 350 kg/cm2 power boost spec on page 41; a low reading points to a worn relief valve or pump. Replace the return filter too: its bypass opens at only 1.5 kg/cm2 (page 128), so a clogged element dumps unfiltered oil back to tank.
Manual Section: Hydraulic and Mechanical System Troubleshooting p. 41Engine won't start, cranks slowly on cold mornings, clicking sound from the starter relay
Load test both batteries against the 12V x 120Ah spec on page 188 and clean the ground strap at the frame. Measure voltage at the starter solenoid while cranking; a big drop on the 24V Delco Remy 28MT starter circuit (page 195) means cable or battery trouble, not a dead motor. Swap the starter only after the cables pass.
Manual Section: Electrical System Troubleshooting p. 188Grinding noise and vibration from swing or travel drive, sluggish rotation under load
Drain a gear oil sample from the swing reduction gear and look for metal flake. Test swing relief pressure at 240 kg/cm2 and travel relief at 420 kg/cm2 against the specs on page 41; a low relief setting mimics worn gears. If contamination shows up, tear the unit down using the reduction gear procedures starting on page 421.
Manual Section: Reduction Gear p. 421Warning lamps flicker, monitor panel drops out, controls go dead when crossing rough ground
Wiggle-test the harness connectors at the cab base while watching the monitor panel for dropouts. Check charging voltage across the 12V x 120Ah battery pair (page 188); low system voltage fakes a dozen different faults. Trace suspect circuits on the wiring diagram and clean every ground point back to bare metal before buying parts.
Manual Section: Electrical System TroubleshootingHydraulic oil temperature climbs into the red and machine loses power on long travel runs
Clean the oil cooler fins with low-pressure air and verify oil level; the hydraulic tank holds 220 L (page 362). Measure main pump delivery pressure at high idle against the 35 kgf/cm2 standard on page 342; high standby pressure builds heat fast. Run the operational performance tests starting on page 327 to isolate the circuit that is dumping heat.
Manual Section: Hydraulic System Troubleshooting (Hyper Dat) p. 342Frequently Asked Questions
What is the hydraulic relief pressure for the boom, arm, and bucket circuits on a Hyundai R170W-3?
The normal relief pressure for the boom, arm, and bucket circuits is 320±10 kgf/cm². When the power boost function is activated, this pressure increases to 350±10 kgf/cm², and the overload relief pressure is 380±10 kgf/cm². p. 343
What are the torque specifications for the engine mounting bolts on a Hyundai R170W-3?
The engine mounting bolts (M12 x 1.75) on the Hyundai R170W-3 should be tightened to a torque of 10±0.5 kgf·m (72.3±3.6 lbf·ft). p. 359
What is the hydraulic tank capacity for the Hyundai R170W-3?
The hydraulic tank capacity for the Hyundai R170W-3 is 200 liters (52.8 U.S. gallons), with a total system capacity of 257 liters (68 U.S. gallons). p. 44
What is the correct procedure for bleeding air from the hydraulic pump after installation?
To bleed the air from the hydraulic pump, remove the air vent plug (2EA), tighten the plug lightly, start the engine and run at low idling until oil comes out from the plug, then tighten the plug fully. p. 363
What is the standard engine speed for the H-mode on a Hyundai R170W-3?
The standard rated engine speed for the H-mode on a Hyundai R170W-3 is 2250+50 rpm at idle and 2100 rpm at rated load. p. 330
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