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 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 |
