I. DESCRIPTION & OPERATIONA.General DescriptionThe Fabco Steerable Drive Axle consists of fourmajor assemblies. The axle housing is the structuralbackbone. Steerable drive ends are attached to eachend of the housing. A differential carrier assembly boltsinto the center of the housing. A steering connecting tierod joins between the right and left steerable drive ends.A steering arm is provided (usually on the left steerabledrive end) for connection into a vehicle’s steeringsystem. It may be equipped with right hand or dualsteering arms.B.OperationDriving forces are put into the axle at the pinionyoke on the differential carrier; they pass through thedifferential to the inner axle shafts and the inner driveyoke of the universal joint; they then pass into the outerdrive yoke and the outer axle shaft which connects to thewheel hub and rotates the wheel.When steered, the outer section of eachsteerable drive end turns about the kingpin centerline.The universal joint, centered on the kingpin centerline,allows driving forces to turn with the steered wheel ends.The axle is equipped with air or hydraulic brakes.The brake shoes expand to contact conventional brakedrums.C.Operating InstructionsIn conditions where the vehicle rear wheelsmight spin, such as sand, loose dirt, mud, snow, ice orascending grades, the front drive axle can be shiftedinto operation for improved traction. Engagement canbe made at any vehicle speed, unless the rear wheelsare spinning. Engagement is best accomplishedwhile the engine is pulling lightly.-2-
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