Part of the Hyundai Repair Manuals.
Looking for a Hyundai R27Z-9 service manual PDF that actually came from the factory? This 419-page manual walks your crawler excavator through every system: pump device, main control valve, swing and travel drives, RCV levers, and full undercarriage teardown. Inside you get complete hydraulic circuit schematics tracing main and pilot lines, electrical diagrams with connector pinouts and monitoring system layouts, and a troubleshooting section that splits hydraulic faults from electrical ones. Page after page of tightening torque tables back up the disassembly steps. Before you crack open that main control valve, verify relief pressure at 220 kgf/cm2 and confirm the pump is putting out 2 x 27.6 l/min at 2300 rpm. Chasing a slow swing with nothing but forum threads gets old fast. This PDF is bookmarked and text-searchable; type the spec, find the page, fix the machine.
What's Inside This Hyundai R27Z-9 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-23 | Safety Hints, Specifications |
| Structure and Function | 24-100 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 101-131 | Hydraulic Circuit, Main Circuit, Pilot Circuit |
| Electrical System | 132-179 | Component Location, Monitoring System, Electrical Circuit |
| Troubleshooting | 180-217 | Before Troubleshooting, Hydraulic and Mechanical System, Electrical System Troubleshooting |
| Maintenance Standard | 218-256 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 257-400 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 401-419 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main pump rated speed | 2300 rpm | p. 17 |
| Main pump rated oil flow | 2 x 27.6 l/min | p. 17 |
| Main control valve main relief valve pressure | 220 kgf/cm2 | p. 18 |
| Main control valve overload relief valve pressure | 240 kgf/cm2 | p. 18 |
| Swing motor capacity | 12.5 cc/rev | p. 21 |
| Travel motor brake release pressure | 19 kgf/cm2 | p. 18 |
| Pressure switch (for engine oil) | 0.5 kgf/cm2 | p. 157 |
| Swing bearing play (Standard) | 0.5 ~ 1.2 mm | p. 228 |
| Swing parking brake releasing pressure (Brake disengaged) | 30±5 kgf/cm² | p. 236 |
| Recoil spring Installed load | 1,700 kg | p. 254 |
| Recoil spring Repair limit Installed load | 1,360 kg | p. 254 |
| Travel motor mounting bolt torque | 13.8±2.0 kgf·m (100±14.0 lbf·ft) | p. 262 |
Hyundai R27Z-9 Common Problems This Manual Covers
Hyundai R27Z-9 pulls to one side when traveling, one track noticeably slower than the other
Test travel relief pressure on each side; both circuits must hold 220±10 kgf/cm2 per the regulator settings on page 238. Swap the crossover relief valves between travel motors and see if the deviation follows the valve. If pressures match, inspect the turning joint seals and compare track tension side to side.
Manual Section: Travel System Troubleshooting p. 218Hydraulic functions weak and slow once the oil warms up, boom struggles under load
Check main relief pressure first; the spec on page 21 is 220 kgf/cm2 (3130 psi). Measure pump delivery next, 20±5 kgf/cm2 at high idle per page 237. If both read low, pull the main pump and compare wear against the limits on page 239; piston clearance of 0.050 mm or more means rebuild time.
Manual Section: Hydraulic System Troubleshooting p. 18Loud swing noise and poor swing power, machine drifts backward when swinging on a slope
Verify swing relief pressure at 175±10 kgf/cm2 using the regulator settings on page 238. Test the swing parking brake; it should release at 30±5 kgf/cm2 per page 236. Measure swing bearing play with a dial indicator, standard is 0.5 to 1.2 mm on page 228; anything beyond that means the bearing is done.
Manual Section: Swing System Troubleshooting p. 236Engine cranks but will not start, no response from the safety solenoid when key turns
Check battery voltage and ground straps, then trace the safety solenoid circuit on the wiring diagram, page 141. Confirm the lever lockout switch closes with the console down; the troubleshooting charts starting on page 180 cover start failure step by step. Verify fuel supply too; the 38 L tank starves the pickup on steep slopes.
Manual Section: Electrical System Troubleshooting p. 180Track keeps loosening or jumping off, tensioner will not hold grease pressure
Clean the tensioner grease valve, pump fresh grease to set track sag, and torque the valve to 10±0.5 kgf·m (72.4 lbf·ft) per page 395. If the track loosens again, test the recoil spring against the standards on page 254: installed load is 1,700 kg with a repair limit of 1,360 kg. Replace the spring at the limit.
Manual Section: Maintenance Standard p. 254Frequently Asked Questions
What are the replacement specifications for the travel motor?
The travel motor maintenance standard specifies that the reducer lubricant should be changed. For internal components, the standard for the body (internal gear) is no pitching with 5% or greater engaging area to tooth surface, and for the carrier 2, the spline tooth surface must show no abnormal damage or wear. p. 244
What are the replacement specifications for the swing motor?
For the swing motor reduction gear section, the inspection standard for the A internal gear is that pitching area must be 5% or more of the gear surface to require replacement of the pinion kit. For the hydraulic motor section, the shaft spline section worn depth must be 25μm or more to require replacement of the hydraulic motor assembly. p. 243
What is the tightening torque for the engine mounting bolts (engine-bracket)?
The tightening torque for the engine mounting bolt (engine-bracket) is 7.3 ± 1.0 kgf·m (53 ± 7.2 lbf·ft). p. 261
What is the standard oil amount for the swing motor reduction gear?
The standard gear oil amount for the swing motor reduction gear is 0.6 liters (0.16 U.S. gal). p. 83
How do you bleed air from the hydraulic pump after installation?
After installation, remove the air vent plug (1EA), tighten it lightly, start the engine at low idling, and check that oil comes out from the plug. Once oil flows, tighten the plug fully. p. 265
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