Part of the Hyundai Repair Manuals.
Every one of the 496 pages in this Hyundai R250LC-7A, R250NLC-7A Service Manual PDF targets one machine family: the R250-7A hydraulic excavator, including the High Walker variant. You get full electrical circuit diagrams with connector pinouts, hydraulic schematics tracing the main and pilot circuits through single and combined operation, and a self-diagnostic section that decodes the mechatronics error codes on your monitor panel. Step-by-step teardown procedures walk you through the pump device, main control valve, swing and travel drives, and boom, arm, and bucket cylinders, all backed by a dedicated component mounting torque chapter. Set the pilot relief valve at 35 kgf/cm2 and pull PF 1 hydraulic ports to 20~25 kgf·m (115~180 lbf·ft). No more chasing a swing fault with a test light and a hunch. Bookmarked, keyword-searchable, and readable on any device: download it and walk straight to the machine.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 11-45 | Safety Hints, Specifications |
| Structure and Function | 46-126 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 127-158 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 159-206 | Component Location, Electrical Circuit, Electrical Component Specification, Connectors |
| Mechatronics System | 207-236 | Outline, Mode Selection System, Self-Diagnostic System |
| Maintenance Standard | 287-323 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 324-481 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 482-496 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Flow control starting pressure change amount | +1.3 kgf/cm2 | p. 58 |
| Tightening torque for PF 1 port | 20~25 kgf·m (115~180 lbf·ft) | p. 67 |
| Tightening torque for PF 3/4 port | 15~18 kgf·m (109~130 lbf·ft) | p. 67 |
| Pilot relief valve pressure | 35 kgf/cm2 | p. 132 |
| Bypass relief valve opening pressure (full-flow filter) | 1.5 kgf/cm2 | p. 130 |
| Bypass check valve opening pressure (return circuit) | 1.5 kgf/cm2 | p. 131 |
| Standard pressure for Boom, Arm, Bucket | 330(360)±10 kgf/cm² | p. 307 |
| Standard pressure for Travel | 330±10 kgf/cm² | p. 307 |
| Port relief v/v setting for Boom, Arm, Bucket | 390±10 kgf/cm² | p. 307 |
| Track shoe mounting bolt, nut | 81 ± 4.0 kgf·m (586 ± 29 lbf·ft) | p. 329 |
| Socket head bolt (Bucket cylinder, Item 23, M22) | 63.0 ± 6.0 kgf·m (456 ± 43.4 lbf·ft) | p. 458 |
| Socket head bolt (Boom cylinder, Item 23, M22) | 63.0 ± 6.0 kgf·m (456 ± 43.4 lbf·ft) | p. 458 |
