TM-9-2320-283-34-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 1983
TM-9-2320-283-34-1 - Page 35 of 624
TM 9-2320-283-34-1
EQUIPMENT DESCRIPTION AND DATA.
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
g.
Rear Tandem Axles.
The rear tandem axles consist of a
forward-rear axle
assembly
and a
rear-rear
axle assembly.
The forward-rear
axle assembly
is equipped with a No-Spin differential carrier and an air actuated
power divider.
The
rear-rear axle
assembly
is equipped
with differential
side
and pinion gears.
The gears in each
differential carrier are spiral bevel in design, with each
drive
pinion positioned
at the
center
line of
the ring
gears.
The differential and drive pinion are each mounted on tapered roller bearings.
The power divider, mounted on the forward-rear axle carrier, is actuated by a cab mounted air switch.
This enables
the driver to "lock-in" or "lockout" the interaxle differential.
With the power divider in the lock in position, torque is
distributed to
both axles
without differential
action.
The forward-rear axle ring and pinion gear are then
driven by the
helical-side gear.
The rear axle gearing is driven from the output shaft side gear and interaxle drive line.
The No-SPIN
differential locks the forward-rear axle wheels, turning them at the same speed.
If one wheel loses
traction or leaves the ground, the opposite wheel, which still has traction, continues to drive the vehicle.
There can be no
one-wheel
spinout on the forward-rear axle.
When turning a corner, the No-SPIN* differential Automatically allows for
the necessary difference in wheel speed with the power divider in the unlocked position.
This difference in wheel speed
will cause a normal "clicking" sound at the
No-SPIN
differential.
1-24
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