2006–2011 Liebherr L550, L556, L566, L576, and L580 2plus2 Wheel Loader Service & Repair Manual (P/N 1035 3357)

• 758-page Liebherr OEM Service Manual PDF — Order No. 1035 3357, Document Version 02 for Series 6 L550, L556, L566, L576, and L580 2plus2 wheel loaders.
• Machine matching is explicit: L550/456 from S/N 16978, L556/454 from S/N 15653, and L566/460, L576/457, and L580/459 from S/N 14171, with additional serial-break notes inside affected sections.
• Follows the powertrain and machine systems from the D934 A6/D936 L A6 engine and pump distributor gear through cooling, hydrostatic travel and working hydraulics, steering, brakes, 2plus2 transfer gear, axles, and electrical/ECU control.
• Factory testing covers SCULI pedal, pump block-curve, and travel-motor calibration; pressure and flow checks; ride-control, steering, brake, and transmission accumulator testing; and final functional checks.
• Provides model-specific hydraulic circuits, component section views, a 110-page electrical circuit-diagram sequence, connector and earth-point references, service-code tables, and 2plus2 transfer-gear troubleshooting schematics.
• Includes maintenance and inspection schedules, lubrication charts, filling-quantity tables, wear checks, component-specific adjustment data, and system-based special-tool lists with ID numbers.
• Separates built-in and external-condenser HVAC, LCD and touch-screen cab controls, Z-lift/direct-attach/quick-change equipment, forklift and connection dimensions, and lift-arm pin-bearing repair.

Exact Machine and System Coverage

The manual does more than place five models on one cover. It ties each loader to its Liebherr product group and starting serial, while section headers identify later splits for emergency-steering components, HVAC condenser layouts, and other running changes. Hydraulic coverage is divided where the hardware changes: L550/L556 and L566/L576/L580 receive separate travel and working-hydraulic layouts. The axle chapter separates L550-L576 from the L580 2plus2, and the cab chapter distinguishes the A13 LCD from the A13a touch-screen arrangement. This structure helps a technician select the correct circuit, component view, and test routine before ordering parts or starting repair work.

Technical Data and Workshop Testing

After the general information, product data, and maintenance chapters, the machine description is organized into fifteen function groups. The production-description chapter carries a 40-page technical-data block covering machine dimensions and Z-lift geometry; D934/D936 engine and pump distributor data; cooling fan drive; variable-displacement pumps and motors; working-hydraulic control, pilot control, and ride control; steering, braking, transmission, axles, drive shafts, ballast, central lubrication, HVAC, lift arms, quick coupler, buckets, and forklift attachments. Engine data and ECU drawings are mapped to the applicable loader groups instead of being presented as one generic powertrain.

Maintenance content goes well beyond an interval chart. It covers engine oil and filters, fuel bleeding, air-intake inspection, soot-particle-filter monitoring and condensate handling, coolant service, hydraulic tank filtration, steering and brake checks, transmission and axle oils, drive shafts, central lubrication, cab filters, lift-arm bearings, bucket stops, and quick-change device testing.

Separate test sheets and SCULI procedures address travel-pump replenishing and pressure cut-off, block-curve and motor calibration, working-pump flow control, control-block relief valves and LS pressure cut-off, ride-control depressurization, steering-pump performance, brake accumulators and switches, and transmission shift pressure. The lift-arm chapter also covers pin-bearing removal, bushing replacement, and bucket-bearing assembly, one of the publication's limited component-level repair sections.

Electrical, Hydraulic, and Diagnostic Reference

The electrical chapter is a major part of this manual. Its 110-page circuit-diagram sequence identifies component locations, earth points, wiring harnesses, connector designations, fuse and relay board A4, master electronics A15, input modules A16a-A16d, output modules A17a-A17d, cab and rear electrical components, battery installation, and D934/D936 engine-ECU circuits.

On the hydraulic side, the manual supplies separate travel and working circuits, steering and brake diagrams, transmission-control schematics, and section views of pumps, motors, control blocks, Servostat, cylinders, brakes, axles, and the mechanical transmission. Chapter 19 adds CRITICAL, ERROR, WARNING, and diesel-engine service-code tables, audible and visual warning logic, and fault isolation for the 2plus2 transfer gear.

Special Tools and Manual-Specific Cautions

The opening tool tables give system-specific IDs rather than generic tool advice. Examples include the SCULI USB dongle 10333608 and diagnostic data cable 10035410, pressure-test equipment, diesel-engine compression and installation tools, hydraulic-cylinder seal sleeves, axle and L580 Hercules tooling, transmission coupling tools, BEKA/Groeneveld lubrication filling equipment, A/C evacuation and test gear, and the cab-glass suction kit.

The manual also flags repair traps worth knowing before work starts. Excessive test pressure can irreparably damage the soot-particle-filter counterpressure monitor. Torn bucket-bearing seal lips allow contamination into the lift-arm bearing, accelerating bushing and pin wear. These are component-specific warnings, not generic shop cautions.

Scope and Safety

This service manual is strongest for technical data, system operation, maintenance, inspection, testing, calibration, schematics, and fault diagnosis. It is not a full internal teardown and overhaul manual for the diesel engines, transmission, axles, hydraulic pumps, or motors; those repair jobs require the matching component overhaul instructions. The master contents lists an Options group, but this version contains no separate Chapter 20 pages.

Raised lift arms, stored hydraulic and accumulator pressure, brake testing, battery isolation, rotating engine components, and refrigerant work require trained personnel, proper machine support, and the safety procedures specified in the manual.