The boom cylinder is on the bench with the piston nut off, and the job stops because nobody remembers the torque. This book has it: 491 Nm on a 70 mm piston, up to 2060 Nm on a 180 mm one.
This is Liebherr Service Manual ID No. 8502675, Issue July 1997, for the R900, R902, R912, R922, R932 and R942 Litronic. These are the machines built before the C generation. The full set runs to 1343 pages. It covers the engine, splitterbox, hydraulics and Litronic electrics, then swing gear, swing ring, travel gear, track components and tank arrangement.
The sections follow the factory order. Go to Hydraulic System for pressure charts or to Swing Ring for axial play without paging through the engine chapters. The text is in English, and the sheet headers are in German, English and French.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 2-50 | Safety, Conversion Factors, General Tightening Torques, ISO Tolerances, Repair Welding, Lubricants and Fuels |
| Tools | 51-153 | Special Tools and Testing Devices |
| Technical Data / Maintenance Guidelines | 154-210 | Technical Data, Maintenance and Inspection Schedules, Adjustment Values and Quantities |
| Engine | 211-233 | Deutz BF4L913 (R900) and Liebherr D904 / D914 / D906 / D916 / D924 / D926 Diesel Engine Data, Lubrication, Fuel, Cooling |
| Coupling / Splitterbox | 234-250 | Engine Coupling and Pump Splitterbox |
| Hydraulic System | 251-447 | Function Schematics of the Hydraulic System, Pressure Charts, Checking and Adjusting Pressures |
| Hydraulic Components | 448-707 | LPVD Variable Displacement Double Pumps, Control Valves, Travel Motors, Hydraulic Cylinders and Tightening Torques |
| Electrical System | 708-836 | Electronic Horsepower Control, Testing Device, Electrical Diagrams, Components |
| Swing Gear | 837-881 | Swing Gear and Swing Motor |
| Swing Ring | 882-890 | Swing Ring Clearances, Axial Play and Mounting Torques |
| Travel Gear / Two Speed Gear Box | 891-953 | Travel Gear and Two Speed Gear Box, Travel Gear - Chart, Travel Gear "Trasmital", Travel Gear - Liebherr "FAT", Travel Brake, Slipring Seal |
| Track Components / Axles | 954-1010 | Track Components, Rollers, Axles |
| Special Attachments / Additional Hydraulic Installations | 1011-1279 | Additional Hydraulic Circuits and Electrical Diagrams for Special Attachments, Quick-Change Systems |
| Cab Heater / Air Conditioning System | 1280-1326 | Cab Heater and Air Conditioning, Heater D1LC, Supplementary Heater D5 W, Air Conditioning System "Konvekta" |
| Undercarriage / Uppercarriage Attachments | 1327-1335 | Undercarriage and Uppercarriage Attachments, Combinations, Tooth System, Tooth Installation / Removal, Distributor Block with Dual Shut Off Valve |
| Arrangement of Tanks | 1336-1343 | Hydraulic and Fuel Tank Arrangement |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| R900 engine | Deutz BF4L913, 4 cylinder turbocharged, air cooled, 4085 cm3 | p. 212 |
| Valve clearance, cold (D904 to D916) | intake 0.20 mm, exhaust 0.25 mm | p. 220 |
| Engine oil quantity with filter change (D904 to D916) | 18.5 liters (4 cylinder), 22.5 liters (6 cylinder) | p. 220 |
| Minimum engine oil pressure, oil at 100 C | 1 bar at 800 rpm, 2 bar at 1400 rpm, 3.5 bar at 2000 rpm | p. 221 |
| Coolant antifreeze content | at least 35 percent, not above 60 percent | p. 221 |
| Engines from serial number 4001 | D924T-E A1, D924TI-E A2, D926T-E A1; R942 with D926T-E A1 rated 164 kW | p. 224 |
| R900 Lpvd 64 Double Pump Pressure Cut-Off | 300 +/- 5 bar beginning, 310 +/- 5 bar end | p. 450 |
| Hydraulic cylinder piston and piston nut torque | 491 Nm on 70 mm piston (M36 x 1.5) up to 2060 Nm on 180 mm piston | p. 538 |
| Swing ring max. axial play | 1.4 mm, all models R900 to R942 | p. 885 |
