2013 Volvo L90C / L120C Wheel Loader Service Manual (P/N 8111858)

Volvo service information for the L90C and L120C wheel loaders, organized by factory function group. The service sheets are dated April 30, 2013, with model-specific procedures and serial-dependent electrical and hydraulic configurations.

• Engine and fuel service: Engine removal and installation, valve adjustment, injection-timing checks, fuel-system bleeding, feed-pressure testing, and stop-solenoid diagnosis.

• Cooling system: Main coolant-pump replacement and intercooler coolant-pump removal, disassembly, inspection, and reassembly.

• Electrical diagnostics: ECU monitoring, Automatic Power Shift (APS II), Contronic service-display functions, sensor checks, wiring diagrams, and component-location references.

• Power transmission: Transmission removal and installation, main and clutch-pressure testing, poor-traction troubleshooting, propeller shafts, drive axles, and differential-lock adjustment.

• Brake repair: Wet-disc inspection and replacement, versions with and without built-in wear indicators, hydraulic bleeding, circuit-pressure checks, and parking-brake service.

• Steering systems: Steering-pump, shift-valve, and ORBITROL steering-valve reconditioning, cylinder replacement, secondary-steering tests, and Comfort Drive Control (CDC) adjustments.

• Loader hydraulics: Working and servo-pressure checks, Boom Suspension System testing, accumulator service, lifting and tilting cylinder seal replacement, and linkage-bearing work.

Suited to heavy-equipment technicians familiar with hydraulic pressure testing, electrical measurements, and lifting major assemblies.

Engine, Fuel and Cooling Service

The engine section covers removal, installation, valve adjustment, and supporting-system service. It does not provide a complete internal engine rebuild procedure; overhaul operations listed in the labor-time guide are labor references.

Injection-timing documentation distinguishes the two engine versions and identifies timing tool 998 7057 and flywheel turning tool 999 3590. The checking-timing principle diagram accompanies the adjustment material, including the effect of timing-gear backlash on the pump setting.

Intercooler coolant-pump reconditioning includes bearing, shaft, seal, and impeller work. The transport notes explain how airflow through the exhaust can spin an unlubricated turbocharger and damage its bearings.

Contronic Diagnostics and Transmission Testing

The ECU material explains machine coding, warning functions, LED fault indications, APS II shifting logic, and Limp-Home operation. Contronic Service Display Unit 999 3721 is covered for viewing signals, settings, stored information, and transmission operating data.

Circuit-specific wiring diagrams include component markings, connector references, and lead identification. Serial-dependent versions cover systems such as secondary steering, CDC, Boom Suspension System, and climate control.

The poor-traction troubleshooting material relates engine stall-speed results to transmission, torque-converter, and clutch-pressure checks. That distinction helps narrow a loss-of-drive complaint before major assemblies are removed.

Transmission coverage includes removal, installation, pressure testing, the gear-shifting diagram, and separate HT131 and HT205 symbol diagrams. Complete internal transmission reconditioning is listed in the time guide rather than supplied as a rebuild procedure.

Brakes, Steering and Loader Hydraulics

Axles and brakes: The drivetrain descriptions distinguish AWB30 axles from the L120C’s AWB31 front axle. Brake procedures address both wear-indicator arrangements, while parking-brake documentation separates the L90C’s external disc arrangement from the L120C’s internal wet-disc brake.

Steering: Pump and valve reconditioning extends to internal inspection and assembly details. Hydraulic diagrams distinguish basic steering, CDC lever steering, secondary steering, and combined configurations.

Working hydraulics: Control-valve section views and hydraulic flow diagrams explain the working circuits. Servo-pressure procedures distinguish machines with and without separate attachment locking.

Boom Suspension System coverage includes flow-path and electrical checks, accumulator reconditioning, precharge checks, and pressure-reducing valve tests. Loader-unit procedures cover boom kick-out, bucket positioning, TP-linkage bearings, and lifting and tilting cylinder seals.

Frame, Cab and Climate Control

Frame-joint bearing replacement, cab removal and installation, and windshield replacement and sealing are documented alongside air-conditioning performance tests and pressure-monitor and thermostat checks.

Refrigerant filling and emptying refer to a separate R134a service manual and require trained personnel with suitable equipment. The refrigerant notes warn that contamination with R12 can damage system components.

Review the factory precautions for articulation, raised lifting arms, stored hydraulic pressure, and heavy component lifting before service work.

Preview of Valve Clearances and Injection Timing

The valve-system specifications list intake clearance at 0.40 mm and exhaust clearance at 0.55 mm, applicable with a warm or cold engine.

The injection-timing section gives the L120C’s TD73KDE pump timing as 9° before top dead center. Component-specific tightening data, metric and UNC torque tables, and recommended lubricants accompany the service information.

Printable PDF and Diagram Detail

Text search and wiring detail: PDF text search and embedded bookmarks are not available. Small labels and light lines on some wiring diagrams require zooming.

One printable English PDF contains 754 pages, including the labor-time guide, tool references, specification sheets, and illustration continuations.