![Hyundai R450LC-3 Repair Manual [Crawler Excavator]](https://youfixthis.com/wp-content/uploads/2016/02/2016-02-20_10-59-53-300x300.jpg)
Part of the Hyundai Repair Manuals.
All 600 pages of this Hyundai R450LC-7 Shop Manual PDF cover one machine: the R450LC-7 hydraulic excavator, from pump device and main control valve to swing drive, turning joint, and travel motors. You get complete hydraulic circuit schematics for the main and pilot circuits, single and combined operation, plus electrical wiring diagrams with component locations and connector pinouts. Inside: self-diagnostic error codes, a full troubleshooting section for hydraulic, electrical, and mechatronics faults, and page after page of disassembly and assembly procedures backed by mounting torque tables. Set boom, arm, and bucket relief pressure to 390±10 kgf/cm2, then torque the engine mounting bolts to 46.4 kgf·m. Your excavator earns nothing parked. Get the factory numbers, not forum guesses. Bookmarked with a real text layer; type any spec, jump straight to it, and get back to work.
What's Inside This Hyundai R450LC-7 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-28 | Safety Hints, Specifications |
| Structure and Function | 29-137 | Pump Device, Main Control Valve |
| Hydraulic System | 138-177 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 178-225 | Component Location, Electrical Circuit, Electrical Component Specification, Connectors |
| Mechatronics System | 226-264 | Mode Selection System, Automatic Deceleration System, Power Boost System, Travel Speed Control System, Self-Diagnostic System, Engine Control System |
| Troubleshooting | 265-314 | Before Troubleshooting, Hydraulic and Mechanical System, Electrical System, Mechatronics System |
| Maintenance Standard | 315-352 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 353-575 | Pump Device, Main Control Valve, Swing Device, Travel Device, Turning Joint, Boom Arm and Bucket Cylinder |
| Component Mounting Torque | 576-600 | Engine System, Electric System, Hydraulic System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Relief valve | 33kgf/cm2 | p. 144 |
| bypass relief valve | 1.5kgf/cm2 | p. 142 |
| Maximum allowable pressure (Boom, Arm, Bucket) | 390±10 kgf/cm2 | p. 337 |
| Engine mounting bolt, nut | 46.4 ± 4.6 kgf·m | p. 358 |
| Radiator mounting bolt | 29.7 ± 4.5 kgf·m | p. 358 |
| Operating Weight | 44900 kg | p. 11 |
| Travel Speed (Low/High) | 3.2/5.3 km/hr | p. 11 |
| Swing Speed | 10.3 rpm | p. 25 |
| Engine Oil Quantity | 37.85 L | p. 24 |
| Battery | 2 x 12V x 160Ah | p. 24 |
| Main Pump Rated Oil Flow | 2 x 380 L/min | p. 24 |
| Hydraulic Tank Capacity | 250 L | p. 360 |
Hyundai R450LC-7 Common Problems This Manual Covers
Hyundai R450LC-7 boom, bucket, and right travel underpowered, hydraulic pressure low on one pump side
Test main relief pressure on the affected pump side. Boom, arm, and bucket circuits should hold 390±10 kgf/cm2 per the pressure standards on page 337. If pressure falls short, work through the troubleshooting chart starting on page 266, then inspect the relief valve seat for scoring and replace the valve if worn.
Manual Section: Hydraulic and Mechanical System Troubleshooting p. 266Stick, swing, and left travel all weak while boom and bucket work normally
Check the relief valve on the opposite pump circuit. Swing standard pressure is 285±10 kgf/cm2 and travel is 345±10 kgf/cm2, both listed on page 337. Swap relief valves between pump sides to confirm the diagnosis: if the weakness follows the valve, replace it rather than trying to adjust it.
Manual Section: Maintenance Standard p. 337All work equipment weak on both extend and retract, oil filter recently replaced
Drain the hydraulic tank (250 L capacity) and inspect the suction side for fragments of the old filter seal blocking flow. Clean out every piece, verify the filter bypass relief valve opens at 1.5 kgf/cm2 as specified on page 142, then refill with clean oil and bleed both pumps before restarting.
Manual Section: Hydraulic System p. 142Boom or arm drifts down fast with pilot valve in neutral, cylinder won't hold load
Measure port relief opening pressure on the drifting circuit; boom, arm, and bucket circuits must hold 390±10 kgf/cm2 per page 337. An opening pressure below spec bleeds cylinder load in neutral. Replace or reseat the port relief valve, then retest drift against the operational performance procedures starting on page 315.
Manual Section: Maintenance Standard p. 315Rubber particles at flywheel housing, rattle between engine and pump at idle
Remove the main pump and inspect the coupling element and hub spline for wear; rubber crumbs in the flywheel housing mean the element has failed. Replace the element, check the hub fastening setscrew for slack, and torque the coupling mounting socket bolts to 4.6±1.0 kgf·m per the table on page 358 during reassembly.
Manual Section: Disassembly and Assembly p. 358Frequently Asked Questions
How do I clear or delete recorded error codes on the Hyundai R450LC-7?
To delete all recorded error codes, select the recorded error (TIME Er) display on the cluster. Then, press the BUZZER STOP switch and the SELECT switch simultaneously for 2 seconds or more. The cluster display will change to 'TIME Er : 00', indicating that the CPU controller has deleted all recorded error codes from its memory. p. 238
What is the tightening torque for the engine mounting bolts on the R450LC-7?
The tightening torque for the engine mounting bolts (M20 x 2.5) is 46.4 ± 4.6 kgf·m (336 ± 33 lbf·ft). p. 357
What is the standard tightening torque for the main relief valve on the R450LC-7?
The standard tightening torque for the main relief valve is 330(360) ± 10 kgf/cm². p. 337
What is the procedure for bleeding air from the hydraulic pump after installation?
After installing the pump, remove the air vent plug (2EA), tighten it lightly, start the engine at low idling, and check for oil coming out of the plug. Once oil flows, tighten the plug fully. p. 361
What is the standard engine speed for the R450LC-7 in H mode?
The standard engine speed for the R450LC-7 in H mode is 1850 ± 50 rpm. p. 319
What format is this Hyundai R450LC-7 manual in?
Immediate download of the complete 600-page searchable Shop Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Am I able to print pages from this Hyundai R450LC-7 manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Reviews
There are no reviews yet.