I. DESCRIPTION & OPERATION
The Fabco Steerable Drive Axle consists of four
major assemblies. The axle housing is the structural
backbone. Steerable drive ends are attached to each
end of the housing. A differential carrier assembly bolts
into the center of the housing. A steering connecting tie
rod joins between the right and left steerable drive ends.
A steering arm is provided (usually on the left steerable
drive end) for connection into a vehicles steering
system. It may be equipped with right hand or dual
Driving forces are put into the axle at the pinion
yoke on the differential carrier; they pass through the
differential to the inner axle shafts and the inner drive
yoke of the universal joint; they then pass into the outer
drive yoke and the outer axle shaft which connects to the
wheel hub and rotates the wheel.
When steered, the outer section of each
steerable 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 brake
In conditions where the vehicle rear wheels
might spin, such as sand, loose dirt, mud, snow, ice or
ascending grades, the front drive axle can be shifted
into operation for improved traction. Engagement can
be made at any vehicle speed, unless the rear wheels
are spinning. Engagement is best accomplished
while the engine is pulling lightly.