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 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 |
