Pressure settings for the travel hydraulic on a Liebherr crawler loader are factory numbers, and this 826-page service manual settles them for the four-model LR 611 to LR 641 series. Travel and working hydraulics fill more than half of this Liebherr LR 611, LR 621, LR 631, LR 641 service manual PDF, with hydraulic schematics that show each circuit beside its pressure settings and function descriptions. Wiring diagrams cover the electrical system, the Daimler-Benz engine and splitter box get their own chapters, and the undercarriage section lays out technical data and wear effects for your tracks. On an LR 611, fill each final drive with 18 l and each track roller with 0.28 l of SAE 80, then retighten cylinder head bolts to 100 to 110 Nm. Tracing a weak track side through travel hydraulics eats hours. Searchable text and bookmarked chapters let you confirm the component and its spec before ordering, so the right part arrives first time.
What's Inside This Liebherr LR 611, LR 621, LR 631, LR 641 Manual
| System | Pages | Key Topics |
|---|---|---|
| Accident Prevention | 4-21 | Hand Signals, Safety Guidelines |
| General Information | 22-66 | Tightening Torques, Functional Symbols |
| Tools and Repair Instructions | 67-103 | Special Tools Daimler-Benz Engine |
| Specifications and Maintenance Guidelines | 104-163 | Technical Data, Maintenance Guidelines |
| Engine Arrangement | 164-208 | Daimler Benz Engine |
| Splitter Box | 209-229 | Technical Data |
| Travel Hydraulic | 230-412 | Pressure Settings, Function |
| Working Hydraulic | 413-680 | Technical Data, Function |
| Undercarriage | 681-826 | Technical Data, Wear Effects |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Retighten cylinder head bolts | 100 - 110 Nm | p. 129 |
| Oil filter housing centre bolt torque | 50 Nm | p. 153 |
| Oil filter housing drain plug torque | 50 Nm | p. 153 |
| Shim thickness | 0.6 mm (0.024") | p. 640 |
| Maximum pressure for hydraulic cab tilt | 120 bar | p. 806 |
| System pressure for lowering cab | above 1.8 bar | p. 807 |
| LR 611 | ||
| Final drive oil quantity | 2x 18 l | p. 105 |
| Oil quantity - front idler SAE 80 | 0,27 l | p. 106 |
| Oil quantity - track roller SAE 80 | 0,28 l | p. 106 |
| Bearing play Shaft I | 0,50 - 1,00 mm | p. 632 |
| Engine Oil Capacity (incl. filter) | 17L | p. 105 |
| LR 621 | ||
| Engine Oil Capacity, LR 621 (incl. filter) | 12L | p. 111 |
Liebherr LR 611, LR 621, LR 631, LR 641 Common Problems This Manual Covers
Liebherr LR 611, 621, 631, 641 Daimler-Benz engine knocking and smoking at the exhaust
Check valve clearance with the engine cold first. On the OM 352, set intake clearance to 0.20 mm as listed on page 105. Next, run a compression pressure check on every cylinder. If a cylinder reads low or an injector is suspect, replace the injector or the cylinder head gasket using the Daimler-Benz engine repair procedures.
Manual Section: Engine Arrangement p. 165Daimler-Benz engine oil pressure dropping low after an engine oil and filter change
Check the oil level first. On the LR 611, the engine takes 17 L including the filter, per page 105. Inspect the oil filter housing, then torque the centre bolt and the drain plug to 50 Nm as listed on page 153. If pressure stays low, work through the low oil pressure checks in the engine troubleshooting chart.
Manual Section: Specifications and Maintenance Guidelines p. 153Turbocharger making an abnormal whistle with excessive exhaust fumes and loss of power
Inspect the turbocharger for oil leaks before you pull anything apart. Run the engine, listen for where the abnormal whistle comes from, and note whether exhaust fumes rise under load. Work through the turbocharger troubleshooting that starts on page 200, one symptom at a time. Whistle, fumes, power loss and oil leaks each have their own path.
Manual Section: Engine ArrangementTravel hydraulic system showing low effective servo pressure during pressure setting checks
Measure the effective servo pressure and compare it with the pressure settings in the Travel Hydraulic section. Trace the servo circuit on the hydraulic schematic so you know which line you are reading. Work through the causes of low effective servo pressure listed on page 361 in order before you touch any pressure setting.
Manual Section: Travel HydraulicTrack chain pins, bushings, sprockets and idlers showing heavy wear on the undercarriage
Inspect the track chain pins and bushings, track pads, sprockets, idlers, track rollers and carrier rollers against the undercarriage wear effects pages. If you replace a sprocket, torque the sprocket nut to its 3000 Nm starting torque as shown on page 643. On the LR 611, refill the front idler with 0,27 l of SAE 80, as page 106 lists.
Manual Section: Undercarriage p. 643Hydraulic cab tilt cylinder suspected of internal leakage when raising or lowering the cab
Test the cab tilt cylinder for leakage at 150 bar, the figure page 810 gives for LR models. Verify that the hydraulic cab tilt circuit never goes above its 120 bar maximum shown on page 806. Before you lower the cab, check that system pressure is above 1.8 bar per page 807, and keep everyone clear of the cab.
Manual Section: Undercarriage p. 810Frequently Asked Questions
What are the tightening torque specifications on Liebherr crawler loaders for standard metric screws with a grade of 8.8?
The tightening torque for standard metric screws with a grade of 8.8 varies by size. For example, an M 8 x 1.25 screw requires 25 Nm, an M 10 x 1.5 screw requires 51 Nm, and an M 12 x 1.75 screw requires 87 Nm. p. 23
What is the correct valve clearance for the OM 352 engine in the Liebherr LR 611?
For the OM 352 engine, the valve clearance for the intake is 0.20 mm and for the exhaust is 0.30 mm when the engine is cold. p. 165
What is the procedure for bleeding the hydraulic system after changing components on Liebherr crawler loaders?
After changing components, fill the hydraulic tank with oil via the return oil filter until visible in the upper sight gauge. Remove fittings on top of the travel pumps, install nylon hoses, and raise them until they are above the oil level in the tank. Open the shut-off valve and actuate the starter motor for 5-10 seconds until oil runs out free of air bubbles. p. 408
What is the maximum sloping position for the OM 352 engine on the Liebherr LR 611?
The specifications table on page 105 lists a maximum sloping position of 45°, which equals a 100 % slope, for the OM 352 engine in the LR 611.
What is the required oil quantity for the splitter box on an LR 611 machine?
The oil quantity for the splitter box on an LR 611 machine is 1.6 liters of SAE 90 oil. p. 105
Will this Liebherr LR 611 Service Manual download right away?
Instant PDF download. You get the full 826-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Is this Liebherr LR 611 manual print-friendly?
Yes. Print the sections you need to take out to the shop for your own use. Standard letter or A4 paper works.
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