Part of the Hyundai Repair Manuals.
All 493 pages of this Hyundai Robex 250-3, 250LC-3, 250NLC-3 service manual PDF cover one machine family: the Robex crawler excavators, from pump device to travel motor. You get complete hydraulic schematics with main and pilot circuit routing, electrical wiring diagrams with component locations, and a full troubleshooting section for hydraulic and mechanical faults. Inside: step-by-step disassembly and assembly procedures for the pump, main control valve, swing device, reduction gear, and work equipment, plus maintenance standards with operational performance tests. Set the main relief valve to 320 kgf/cm2 (4550 psi) and the swing motor relief to 275 kgf/cm2 (3911 psi); the starter is a 24V Delco Remy 37MT. Your excavator is down and every idle hour costs money. Get the factory numbers, not forum guesses. Bookmarked with a full text layer; pull it up on your tablet at the machine and start wrenching.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-42 | Safety, Specifications, Working Range |
| Structure and Function | 43-120 | Pump Device, Main Control Valve, Swing Device |
| Hydraulic System | 121-152 | Main Circuit, Pilot Circuit, Combined Operation |
| Electrical System | 153-197 | Component Location, Electrical Circuit, Electrical Component Specification |
| Mechatronics System | 198-235 | Outline, Mode Selection System, Automatic Deceleration System |
| Troubleshooting | 236-289 | Hydraulic and Mechanical System |
| Maintenance Standard | 290-324 | Operational Performance Test, Major Component, Track and Work Equipment |
| Disassembly and Assembly | 325-493 | Precautions, Pump Device, Main Control Valve, Swing Device, Reduction Gear, Travel Device, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Main relief valve pressure | 320kgf/cm2 (4550psi) [350kgf/cm2 (4980psi)] | p. 39 |
| Overload relief valve pressure | 380kgf/cm2 (5405psi) | p. 39 |
| Starting motor | Delco Remy 37MT(24V) | p. 38 |
| Starter motor | DELCO REMY 28MT 24V | p. 179 |
| Clearance between piston & cylinder bore | 0.039mm | p. 4 |
| Play between piston & shoe caulking section | 0-0.1mm | p. 310 |
| Spacer bolt torque | 9.8 ~ 11.8 kgf·m | p. 364 |
| Orifice torque | 15.0 ~ 18.0 kgf·m | p. 364 |
| Engine oil quantity | 29 L | p. 38 |
| ROBEX 250-3 | ||
| Operating weight, ROBEX 250-3 | 23600 kg | p. 18 |
| ROBEX 250LC-3 | ||
| Operating weight, ROBEX 250LC-3 | 24300 kg | p. 19 |
| ROBEX 250NLC-3 | ||
| Operating weight, ROBEX 250NLC-3 | 24200 kg | p. 20 |
