CLAAS Dominator 108 VX, 98 VX & 88 VX Combine Harvester Service & Repair Manual (P/N 297 977.0)

This CLAAS repair manual, publication 297 977.0, covers the Dominator 108 VX, 98 VX, and 88 VX combine harvesters. Model-specific headings distinguish procedures for different engine, brake, drive, and cleaning-system configurations.

• Threshing and separation: Feeder housing removal, concave adjustment, threshing drum bearing replacement, rasp-bar service, straw walker repairs, and intensive separation system work.

• Cleaning system: Sieve pan and preparation floor removal, cleaning fan repairs, and 3-D cleaning system adjustment using the factory gauge.

• Transmission and axles: Gearbox and differential disassembly, final-drive rebuilding, steering axle service, and CLAAS 4-trac hydraulic motor removal and bleeding.

• Hydraulic diagnosis: Double-pump testing, pressure relief valve adjustment, hydraulic ram rebuilding, and Linde or Sauer ground-drive pressure checks.

• Grain handling and residue equipment: Returns and grain elevator repairs, unloading auger service, angle-drive assembly, and chaff spreader, straw spreader, and straw chopper repairs.

• Engine electrical and air conditioning: Starter and alternator replacement, plus Sanden SD5H14 compressor clutch, cylinder-head gasket, shaft-seal, and refrigerant-system service.

The repair procedures suit experienced combine technicians with lifting equipment, hydraulic pressure gauges, and the specified service tools; refrigerant work is reserved for specialized refrigeration workshops.

Threshing, Cleaning, and Crop Handling

Straw walker procedures distinguish wooden-bearing and ball-bearing arrangements. The cleaning sections also separate machines with and without the 3-D system, while the fan chapter provides different procedures for the 108 VX and the 98 VX/88 VX.

The 3-D adjustment instructions cover the pendulum linkage and pivot arm, including use of 3-D gauge Part No. 181 993.1. The “3-D sieve pan suspension and cleaning system” exploded view identifies the associated rods, bearings, and brackets.

The sieve pan instructions explain why tightening its metal-to-rubber bearings outside the center of the oscillating range can cause unequal torsional loading and premature bearing wear.

Elevator and unloading sections extend to shaft removal, chain installation, and angle-drive assembly. Separate repairs address the straw chopper cutting cylinder and the spreader drive components.

Gearbox, Brakes, and Ground Drive

Gearbox procedures separate the 108 VX from the 98 VX/88 VX internal assemblies. Drum-brake and disc-brake configurations have their own access and installation instructions, followed by differential repair and final-drive work.

Brake coverage includes hand-brake cable replacement, master-cylinder service, hydraulic bleeding, and brake shoe or pad replacement. Steering coverage addresses Orbitrol leakage symptoms, valve-block repairs, axle stops, and CLAAS 4-trac components.

Hydrostatic procedures cover pump and motor removal, installation, adjustment, bleeding, and high-, charge-, and purge-pressure testing. Linde and Sauer test-port photographs help technicians match the pressure checks to the fitted drive.

Reference illustrations include the left- and right-hand drive diagrams, the differential exploded view, and the CLAAS 4-trac system exploded view. Lubricants charts and torque tables cover gearboxes, final drives, metric fasteners, and ISO 6149 hydraulic O-ring fittings.

The general repair notes also explain how excessive thread-locking compound in long or blind threads can raise removal torque enough to break a bolt.

Hydraulic Components, Engine Work, and Air Conditioning

Hydraulic repair sections cover steering rams, cutterbar lift cylinders, rotary couplings, and CLAAS Auto-Contour components. Valve procedures include low-pressure relief adjustment and working-hydraulics testing, supported by illustrations such as the drum-speed adjustment valve exploded view.

Engine removal and installation sections identify Mercedes OM 366 LA and Perkins configurations. Engine P.T.O., radiator, rotary screen, fuel tank, and fuel-system bleeding procedures are included. Internal diesel-engine overhaul procedures are not included.

The Sanden SD5H14 section goes beyond compressor replacement to clutch assembly, shaft-seal replacement, cylinder-head gasket work, oil-level checks, and refrigerant filling.

When working on heavy agricultural machinery, always verify load capacities, depressurize hydraulic accumulators before opening lines, and follow established safety protocols to prevent equipment damage or personal injury.

Preview: Compressor Clutch and Brake Linkage Clearances

The Sanden SD5H14 clutch assembly section specifies a 0.4–0.8 mm clearance between the thrust plate and V-belt pulley, with shim adjustment covered in the accompanying procedure.

The brake master-cylinder installation section specifies a maximum linkage play of 0.5 mm with the brake pedals at rest. These examples show the component-level adjustment detail included alongside the larger assembly repairs.

Searchable PDF with Chapter Bookmarks

Text search and illustration detail: Searchable text and embedded PDF bookmarks provide access to the repair sections. Detailed drive diagrams and exploded-view callouts can be enlarged for closer inspection.

Supplied as one printable PDF containing 1,046 pages, including two cover/additional pages already counted in that total. The file contains 1,044 manual pages between those covers.