Part of the Hyundai Repair Manuals.
Wrenching on a Hyundai R110-7A or R110D-7A? This 423-page Hyundai shop manual PDF covers both hydraulic excavator variants, from the main pump and control valve to the swing and travel devices. Inside: full hydraulic circuit schematics with pilot and combined-operation flow paths, electrical wiring diagrams with connector pinouts, and a mechatronics section covering the self-diagnostic system and EPPR valve. You also get a full troubleshooting chapter plus step-by-step disassembly and assembly procedures for every major component, torque tables included. Set the pilot relief valve at 35 kgf/cm2 and fill the hydraulic system to 210 L; the tank alone takes 100 L. Check piston-to-shoe play against the 0-0.1 mm limit before you condemn that pump. Your excavator is dead in the yard while you hunt for numbers. Bookmarked with a full text layer: search any spec, jump to any section, get back to digging.
What's Inside This Hyundai R110-7A, R110D-7A Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-27 | Safety Hints, Specifications |
| Structure and Function | 28-107 | Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Rcv Pedal |
| Hydraulic System | 108-140 | Hydraulic Circuit, Main Circuit, Pilot Circuit, Single Operation, Combined Operation |
| Electrical System | 141-168 | Component Location, Electrical Circuit, Electrical Component Specification |
| Mechatronics System | 169-200 | Outline, Mode Selection System, Monitoring System |
| Maintenance Standard | 248-283 | Operational Performance Test, Major Components, Track and Work Equipment |
| Disassembly and Assembly | 284-400 | Precaution, Tightening Torque, Pump Device, Main Control Valve, Swing Device, Travel Device, Rcv Lever, Turning Joint |
| Component Mounting Torque | 401-423 | Introduction Guide, Engine System, Electric System, Undercarriage, Structure, Work Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Hydraulic oil capacity (Tank) | 100 L (26.4 U.S. gal) | p. 23 |
| Hydraulic oil capacity (System) | 210 L (55.5 U.S. gal) | p. 26 |
| Pilot relief valve setting pressure | 35kgf/cm2 | p. 112 |
| Play between piston(1) & shoe caulking section(3) | 0-0.1 mm | p. 268 |
| Hydraulic tank quantity | 100 L (26.4 U.S. gal) | p. 290 |
| Main relief valve tightening torque | 8~9 kgf·m (57.8~65.1 lbf·ft) | p. 325 |
| Overload relief valve tightening torque | 8~9 kgf·m (57.8~65.1 lbf·ft) | p. 325 |
| Engine oil quantity | 18.5 L | p. 23 |
| Rated gross horse power | 97 Hp at 1800 rpm | p. 23 |
| Main relief valve pressure | 330 kgf/cm2 | p. 24 |
| R110-7A | ||
| Operating weight | 11200 kg | p. 12 |
| R110D-7A | ||
| Operating weight | 11900 kg | p. 13 |
Hyundai R110-7A, R110D-7A Common Problems This Manual Covers
Hyundai R110-7A all hydraulic functions weak and slow, boom struggles to lift a full bucket
Test main circuit pressure at the pump outlet with the function stalled. You should see 330 kgf/cm2 per the spec on page 24. If pressure reads low, adjust the main relief valve; if it will not hold adjustment, replace it and torque with a 32 mm spanner to 8~9 kgf·m (57.8~65.1 lbf·ft), page 325.
Manual Section: Hydraulic and Mechanical SystemHydraulic pump whining or growling under load, oil in the tank looks foamy
Check hydraulic oil level first; the full system holds 210 L (55.5 U.S. gal), page 26, and a low tank pulls air straight into the suction line. Clean the suction filter and bleed the pump. If the noise continues, pull the pump and measure piston to shoe play; anything over 0.1 mm means a worn rotating group, page 268.
Manual Section: Maintenance Standard p. 268Boom and bucket creep down slowly with control levers locked in neutral
Remove the overload relief valve from the drifting circuit and swap it with one from a healthy circuit. If the drift follows the valve, replace it and torque to 8~9 kgf·m (57.8~65.1 lbf·ft) with a 32 mm spanner, page 325. If the drift stays put, suspect internal cylinder leakage and repack that cylinder.
Manual Section: Disassembly and Assembly p. 325Engine runs fine but no hydraulic function responds when the levers are moved
Verify pilot pressure before blaming the main pump. Tee a gauge into the pilot line and check for 35 kgf/cm2 with the engine at operating speed, page 112. No pilot pressure means no spool movement anywhere. Check the pilot relief valve and the safety solenoid, then inspect the pump coupling for sheared elements.
Manual Section: Hydraulic System p. 112Cluster displays a sensor-circuit error code and rpm drops to idle
Check the connectors and wiring at the affected pressure sensor before replacing parts; the cluster fault-code list in the Mechatronics section identifies which sensor circuit each code belongs to. Verify pilot supply pressure holds 35 kgf/cm2, page 112, since a weak pilot circuit skews sensor readings and mimics a failed sensor.
Manual Section: Mechatronics System p. 178Frequently Asked Questions
How do I delete recorded error codes on the Hyundai R110-7A excavator?
To delete recorded error codes, navigate to the 'Diagnosis' menu on the cluster display. Select 'Recorded Error', then choose the option to delete all errors. The system will prompt you to confirm by selecting 'Yes' to clear the memory. p. 177
What are the replacement specifications for the main relief valve?
The main relief valve should be replaced if it is damaged or does not function properly. When installing the main relief valve into the body, it must be tightened to a torque of 8-9 kgf·m (57.8-65.1 lbf·ft) using a 32mm spanner. p. 324
What is the standard engine oil quantity for the R110-7A?
The engine oil quantity for the Mitsubishi D04FD-TAA engine is 18.5 liters (4.9 U.S. gal). p. 23
What is the tightening torque for the engine mounting bolts on the R110-7A?
The tightening torque for the engine mounting bolts (Engine-Bracket) is 10.0 ± 1.0 kgf·m (72.3 ± 7.2 lbf·ft). p. 287
How do I bleed air from the hydraulic pump after installation?
After installing the pump, remove the air vent plug (2EA) and tighten it lightly. Start the engine, run at low idling, and check that oil comes out from the plug, then tighten the plug fully. p. 291
How will I receive this Hyundai R110-7A Shop Manual?
A single searchable PDF file of 423 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Is printing allowed for this Hyundai R110-7A Shop Manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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