Fig. 1. IH Single Reduction Tandem Rear Axle
This service manual covers rebuild procedures
and specifications for the IH built Single Reduction
Tandem Axle. Both forward rear and rear rear axles of
the models RA-341, 351 and 355 rear axles are
included. The repairs are performed principally on the
power divider and differential carrier of the forward axle
and the differential carrier of the rear rear axle after they
are removed from the axle housing.
The IH thru-drive tandem rear axle consists of a
heavy-duty single reduction axle with integral power
divider and inter-axle differential for the forward rear axle
and a conventional heavy-duty single reduction axle for
the rear -rear axle. Differential parts, ring gear and
pinion sets, bearings, and axle shafts are common
between the forward and rear axles.
The forward axle has the power divider anc inter-
axle differential mounted on the forward side of the
differential carrier. A thru-shaft carries driving torque
through the forward axle housing to the rear rear axle.
Driving torque is delivered to the forward rear axle via the
intermediate idler gear and
a driven gear mounted on the pinion shaft of the forward
The complete differential carrier and power
divider may be removed from the forward axle housing
as a unit with the axle mounted in the truck as well as
when the axle is removed. Also the power divider may
be removed individually without removing the differential
carrier. This permits servicing the power divider without
disturbing the forward axle differential.
FORWARD REAR AND REAR REAR AXLES
Remove Axle Shafts From Wheels and Housings
Drain lube from both axle housings and the
power divider. To drain power divider, remove
plug from bottom of intermediate case.
Take off all nuts from studs around rear wheel
Loosen shaft from hub by striking center of axle
shaft flange with 2.3 - 2.7 Kg (5-6 lb.) hammer or
Pull axle shafts from housing.
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