Liebherr's own document number, 1035 3357, identifies this 714-page factory service manual for the L550 through L580 wheel loaders, five variants in all. If a Liebherr L566 service manual PDF is what you came for, the hydraulic schematics trace oil from the pumps through the control block, pilot control unit and ride control to the lift and tilt cylinders, and the wiring diagrams map the loader's electrical circuits. Steering, brakes, transfer gear, axles and the articulation bearing are all covered, and the book closes with service codes and diagnosis so you can trace a malfunction to its cause. Check the service brake accumulator for a 95 bar nitrogen preload, and pull M24 10.9 screws to 960 Nm. A parked loader moves no tonnage, hour after hour. The PDF is bookmarked by chapter and has a searchable text layer, so you can go from fault code to repair and have your loader moving material again.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| General Information | 1-18 | Safety Regulations, Special Tools for Maintenance and Repair Work |
| Product Description | 19-58 | Technical Data |
| Maintenance | 59-168 | Maintenance and Inspection Schedule, Testing and Adjustment Plan, Maintenance Tasks |
| Diesel Engine and Pump Distributor Gear | 169-198 | Diesel Engine, Fuel System, Air Filter System |
| Cooling System | 199-214 | Gear Pump, Gear Motor, Temperature Sensor |
| Travel Hydraulics | 215-250 | Variable Displacement Pump, Variable Displacement Motors |
| Working Hydraulics | 251-322 | Working Hydraulics Pump, Control Block, Pilot Control Unit, Ride Control, Lift and Tilt Cylinders, Hydraulic Tank |
| Steering System | 323-354 | Steering Pump, Servostat, Steering Cylinder, Emergency Steering |
| Brake System | 355-382 | Service Brake, Parking Brake, Overspeed Protection |
| Electrical System | 383-388 | Electrical Components |
| Options | 389-526 | Battery Installation |
| Transfer Gear | 527-548 | Mechanical Transmission, Electronic Control Unit, Hydraulic Control |
| Axles and Cardan Shaft | 549-564 | Axles L550 L576 2plus2, Axles L580 2plus2, Drive Shafts |
| Machine Frame and Ballast Weight | 565-576 | Machine Frame, Articulation Bearing, Oscillating Axle Mount, Articulation Lock, Ballast Weight |
| Central Lubrication System | 577-590 | Manual Central Lubrication, Automatic Central Lubrication System |
| Coverings and Access | 591-600 | Covering, Cab Access |
| Cab, Heating and Air-Conditioning | 601-630 | Instrument Panel, Heating, Ventilation, Air Conditioning, Air Conditioning System |
| Lift Arms and Quick-Change Device | 631-644 | Lift Arms, Pin Bearing, Quick Change Device |
| Equipment and Accessories | 645-658 | Loading Bucket, Forklift, Connection Sizes |
| Service Codes and Diagnosis | 659-714 | Malfunctions |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| All Models |
| Manometer for hydraulic pressure testing | 0 - 40 bar, 0 - 250 bar, 0 - 600 bar | p. 13 |
| M24 10.9 screw tightening torque | 960 Nm | p. 50 |
| Return suction filter Filtration grade | 10 µm | p. 40 |
| Return suction filter Pre-tension valve | 0.3 bar | p. 40 |
| Service brake hydro accumulator Preload pressure (nitrogen filling) | 95 bar | p. 43 |
| Parking brake hydro accumulator Preload pressure (nitrogen filling) | 80 bar | p. 44 |
| Steering pump Pressure cut-off | 210±5 bar | p. 40 |
| Working hydraulics pump Power controller start of regulation | 180±10 bar | p. 36 |
| Fuel fine filter cartridge tightening | 1/2 a revolution by hand | p. 97 |
| Wheel nut tightening torque | 750 Nm | p. 127 |
| L566 |
| High pressure relief valves (Forward) | 470±10 bar | p. 72 |
| L550 |
| Engine Oil Capacity (L550) | 31 L | p. 75 |
