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 Liebherr L550–L580 2plus2 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 |
Liebherr L550–L580 2plus2 Common Problems This Manual Covers
Liebherr L550 to L580 wheel loader brake accumulator pressure dropping below spec after repeated pedal applications
Check accumulator pressure after nine braking actions; the gauge must still read above 50 bar per page 71. If it falls short, test the service brake hydro accumulator nitrogen preload against 95 bar on page 43 and the parking brake accumulator against 80 bar on page 44 before you suspect the compact brake valve.
Manual Section: Brake System p. 71Steering pump high pressure cut-off reading low on the gauge during a steering system pressure test
Test steering pump high pressure with a manometer against 210±5 bar following page 154. Then check the flow controller differential pressure against 22±2 bar on page 155. If either reading is out, work through the steering pump, servostat and emergency steering checks in the Steering System section starting at page 323.
Manual Section: Steering System p. 154Working hydraulics pump power regulator start of regulation reading off spec on the pressure gauge
Measure the working hydraulic pump power regulator start of regulation against 180±10 bar following page 71, then check the flow regulator pressure difference against 22±2 bar. Inspect the control block, pilot control unit and lift and tilt cylinders in the Working Hydraulics section from page 251 if the pump settings check out.
Manual Section: Working Hydraulics p. 71Hydraulic tank return suction filter element clogged with contamination and the bypass valve opening
Replace the return suction filter with a 10 µm element following page 40. The bypass valve opens at 3.0 bar, so a loaded element lets oil skip filtration. Inspect the 80 µm return strainer and 160 µm replenishing strainer, then fill the hydraulic tank to its 135 L capacity.
Manual Section: Working Hydraulics p. 40Travel hydraulics high pressure relief valves reading off spec in forward or reverse on the gauge
Test the forward and reverse high pressure relief valves on the L566 against 470±10 bar following page 72, and verify the high pressure cut-off at 430±5 bar. Use a 0 to 600 bar manometer. If values are right, check the variable displacement pump and motors in the Travel Hydraulics section from page 215.
Manual Section: Travel Hydraulics p. 72Critical, error or warning service code showing on the display with a machine malfunction
Check the full service code against the error code reference starting, which lists the cause and remedy for engine, electrical and hydraulic codes. Work the listed remedy in order before you replace any parts, and recheck the display once the repair is done to confirm the code does not return.
Manual Section: Service Codes and MalfunctionsFrequently Asked Questions
How do I calibrate the gas-pedal angle sensor?
The gas pedal angle sensor is calibrated using the SCULI software. Connect your laptop, run the SCULI program, and select the 'Adjustment Pedals' folder. Set 'Throttle - start adjustment' to 1, then push the gas pedal all the way down. The MIN and MAX positions are stored automatically after 15 seconds. p. 144
How do I calibrate the travel motors on a Liebherr L550, L556, L566, L576, or L580?
The variable displacement motors are calibrated automatically by the master electronics. Connect your laptop, run the SCULI program, and select the 'Adjustment Travel motor' folder. Set the parameter 'Travel motor - start motor adjustment' to 1. The engine speed will automatically increase to 1000 min-1 and the motors will be calibrated across the entire speed range. p. 148
What are the engine oil and fuel filter replacement specs for the Liebherr L550–L580 2plus2?
For the diesel engine, use genuine Liebherr spare parts. When changing the oil filter, tighten the cartridge by a half to three-quarter turn by hand after the sealing ring touches the filter bracket. The fuel pre-filter cartridge should be replaced with a genuine Liebherr part, and the filter cartridge should be tightened a half turn by hand. p. 90
What is the correct valve play for the D934 and D936 engines?
The valve play for the D934 and D936 engines must be checked with the engine cold. The inlet valve play is 0.30 mm, and the outlet valve play is 0.40 mm. p. 93
What is the wheel nut tightening torque for the Liebherr L550–L580 2plus2 wheel loader?
The wheel nuts on all four wheels must be tightened with a torque of 750 Nm. This check should be performed once after 50, 100, and 250 service hours. p. 127
Do I get instant access to this Liebherr L550 Service Manual?
You get a 714-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Liebherr L550 manual print-friendly?
Yes. Print the pages you need for the job in your own shop, and bin them when they get greasy.
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