Part of the Hyundai Repair Manuals.
Every one of the 467 pages in this Hyundai R800LC-7A Service Manual PDF is aimed at one machine: Hyundai's R800LC-7A crawler excavator, from the pump device to the travel motors. You get full hydraulic schematics for the main and pilot circuits, complete electrical wiring diagrams with connector pinouts, and a mechatronics section that turns self-diagnostic error codes into plain answers. A thick troubleshooting section walks you through hydraulic, electrical, and mechatronics faults, while the disassembly chapters carry tightening torques for every major component you'll pull apart. Set the bypass relief valve to crack at 1.5 kgf/cm2, and hold piston-to-shoe play inside 0 to 0.1 mm when you rebuild the pump. An 80-ton excavator parked in the dirt bleeds money by the hour. Bookmarked with a real text layer: search any spec, jump straight to your section, fix the machine.
What's Inside This Hyundai R800LC-7A Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 11-38 | Safety Hints, Specifications |
| Structure and Function | 39-125 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 126-152 | Hydraulic Circuit, Main Circuit, Pilot Circuit |
| Electrical System | 153-202 | Component Location, Electrical Circuit, Electrical Component Specification, Connectors |
| Mechatronics System | 203-242 | Outline, Mode Selection System, Self-Diagnostic System |
| Maintenance Standard | 293-330 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 331-447 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 448-467 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Battery | 4 x 12V x 200Ah | p. 35 |
| Bypass relief valve opening pressure | 1.5kgf/cm2 | p. 130 |
| Bypass check valve(1) setting pressure | 5.0kgf/cm2 | p. 130 |
| Battery Voltage | 24V | p. 159 |
| Play between piston(1) & shoe caulking section(3) | 0-0.1mm | p. 314 |
| Track roller clearance between shaft and bushing | 0.28 to 0.5 mm | p. 325 |
| Track roller side clearance of roller | 0.34 to 1.678 mm | p. 325 |
| Idler clearance between shaft and bushing | 0.35 to 0.43 mm | p. 327 |
| Idler side clearance of idler | 0.4 to 1.4 mm | p. 327 |
| Turning joint sliding surface with sealing sections plating wear limit | 0.1 mm | p. 323 |
| Swing bearing upper part mounting bolt | 175 ± 20 kgf·m | p. 336 |
| Swing bearing lower part mounting bolt | 175 ± 20 kgf·m | p. 336 |
Hyundai R800LC-7A Common Problems This Manual Covers
Hyundai R800LC-7A hydraulic functions weak and slow, main pump whining under load
Check the hydraulic tank oil level first, then pull and inspect the suction strainer for debris. A clogged return filter forces oil past the bypass relief valve, which opens at 1.5 kgf/cm2 per page 130. Work through the attachment and travel troubleshooting steps before condemning the pump.
Manual Section: Hydraulic and Mechanical System Troubleshooting p. 130Hydraulic oil temperature climbs into the red during normal digging, fan still turning
Blow out the oil cooler and radiator cores with compressed air from the fan side; mud packed between them kills airflow. Verify oil level and fan belt tension. Measure pump case drain pressure and compare it against the case-drain limit in the Maintenance Standard section; a reading above it means internal leakage is dumping heat into the oil.
Manual Section: Hydraulic and Mechanical System Troubleshooting p. 314Track shoes coming loose and rollers wearing fast after long travel between benches
Retorque the track shoe bolts and the track tension body mounting bolts to the values in the tightening-torque table in the Component Mounting Torque section. Then measure track roller shaft-to-bushing clearance; standard is 0.28 to 0.5 mm on page 325, so replace any roller beyond that.
Manual Section: Maintenance Standard p. 325Engine cranks slowly or just clicks and will not start on cold mornings
Load-test all four batteries; this machine carries 4 x 12V, 200Ah units feeding a 24V system, listed on pages 35 and 159. Clean and tighten ground straps and starter connections, then check fuses and connectors against the wiring diagram on page 156. Drain water from the fuel system if it fires then stalls.
Manual Section: Electrical System Troubleshooting p. 35Swing bearing groans and upper structure rocks when slewing a loaded bucket
Check swing bearing mounting bolts for looseness; torque upper and lower bolts to 175 ± 20 kgf·m as listed on page 336. Grease the bearing and swing gear, then cut open a grease sample and look for metal. Test swing motor relief pressure against the specification table in the General section if slewing power also feels weak.
Manual Section: Disassembly and Assembly p. 336Frequently Asked Questions
How do I clear or delete recorded error codes on the Hyundai R800LC-7A excavator?
To delete recorded error codes, navigate to the 'Diagnosis' menu on the cluster. Select 'Recorded Error', then choose the option to delete all errors. The system will prompt you to confirm by selecting 'Yes', after which all recorded errors will be cleared from the memory. p. 215
What is the standard tightening torque for the engine mounting bolts on the R800LC-7A?
The standard tightening torque for the engine mounting bolts (M24 x 3.0) is 88.2 ± 8.8 kgf·m (638 ± 63.7 lbf·ft). p. 335
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 that oil comes out from the plug. Once oil flows, tighten the plug fully. Finally, run the engine at low idling for 3 to 5 minutes to circulate oil through the system. p. 339
What is the standard engine oil quantity for the Cummins QSX 15 engine?
The standard engine oil quantity for the Cummins QSX 15 engine is 45.4 liters (12 U.S. gal). For the low noise version, it is 43.5 liters (11.5 U.S. gal). p. 35
What is the standard tightening torque for the bucket cylinder rod pin?
The tightening torque for the M24 x 3.0 bolts used on the bucket cylinder rod pin is 100 ± 15 kgf·m (723 ± 108 lbf·ft). p. 467
How quickly can I access this Hyundai R800LC-7A manual after buying?
You download the Service Manual yourself: 467 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Can I print just the pages I need from this Hyundai R800LC-7A manual?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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