Part of the Hyundai Repair Manuals.
All 531 pages of this Hyundai R450LC-3, R450-3 service manual PDF cover one machine family: the Robex 450 hydraulic excavator, from pump device to swing and travel drives. Inside: full electrical circuit diagrams with component locations, hydraulic schematics tracing the main and pilot circuits, and a troubleshooting section that walks hydraulic and mechanical faults back to the root cause. You also get exploded views of the main control valve and work equipment, plus mechatronics coverage of the mode selection and automatic deceleration systems. Set the main relief valve at 325 kg/cm2 (4620 psi) and confirm each pump section flows its rated 360 l/min before you condemn the MCV. Your excavator is dead in the yard while you hunt for numbers. This PDF is bookmarked, keyword-searchable, and opens on any device; download it and go fix the machine.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-39 | Safety Hints, Specifications |
| Structure and Function | 40-114 | Pump Device, Main Control Valve, Swing Device, Travel Device |
| Hydraulic System | 115-145 | Hydraulic Circuit, Main Circuit, Pilot Circuit |
| Electrical System | 146-201 | Component Location, Electrical Circuit, Monitoring System |
| Mechatronics System | 202-230 | Outline, Mode Selection System, Automatic Deceleration System |
| Troubleshooting | 231-305 | Hydraulic and Mechanical System |
| Maintenance Standard | 306-337 | Operational Performance Test, Major Component, Track and Work Equipment |
| Disassembly and Assembly | 338-531 | Precautions, Pump Device, Main Control Valve, Swing Device, Travel Device, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Main relief valve pressure | 325kg/cm2 (4620psi) / 350kg/cm2 (4980psi) | p. 36 |
| Overload relief valve pressure | 380kg/cm2 (5400psi) | p. 36 |
| Main pump maximum pressure | 350kg/cm2 (4980psi) | p. 35 |
| Main pump rated oil flow | 2 x 360 l/min (95.1U.S. gpm/79.2U.K. gpm) | p. 35 |
| Relief valve setting pressure | 33kg/cm2 | p. 119 |
| Abnormality code 19 | Below 18V of input voltage | p. 223 |
| Error code 01 resistance between CN-50(4)-(11) or (5)-(12) | 4 ~ 9 Ω | p. 270 |
| Over load relief pressure (Boom up, Arm, Bucket) | 380 kgf/cm2 | p. 325 |
| Engine Oil Quantity | 38 L | p. 35 |
| R450-3 | ||
| Operating Weight, R450-3 | 43400 kg | p. 18 |
| Swing Speed | 10.0 rpm | p. 36 |
| R450LC-3 | ||
| Operating Weight, R450LC-3 | 44300 kg | p. 19 |
