Lesson 2/Learning Event 3
There are two methods that can be used to check the toe-in of an M35A2 truck.
Place a toe-in gage between the tires ahead of the axle with the ends of the
gage against the tires' sidewalls. Both chains must be the same distance from
the floor to make sure the gage is positioned properly on each wheel. Set the
gage so the pointer measures zero. Move the truck forward until the chains
are the same distance from the floor in the back of the axle as they were in
front. The pointer will now show the amount the wheels are either toed-in or
toed-out in the front. The correct setting is 1/16 to 3/16 inch closer in front
than in back for vehicles using 9.00x20 tires.
The second method consists of making a scribe mark in the center of the
front of each front tire at the same height from the floor as the center of the
axle. Using a steel tape, measure the distance between the two marks. Then,
roll the vehicle forward until the marks are the same distance from the floor
as they were in front, and measure the distance between them. Make the
necessary adjustments to the tie rod to bring the toe-in to the proper amount.
Inspection of M151-Series Truck Axles
This vehicle has front and back drive assemblies bolted to the frame rails and swing axles
to the wheels.
To inspect these drive assemblies, use the following as a guide:
Check the differential for insecure mounting, leaking seals and gaskets, and
for damage to the drive and side gear flanges.
Check the breather valve (located at the top of the differential).
Check the wheel drive shafts and universal joints for wear, damage, and
improper mounting. (The slip joint end should be connected to the
Check the wheel drive flanges and the spindle hub for damage and insecure
Road-test the vehicle, and listen for excessive or unusual noise in both the
front and rear drive assemblies.