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TM 9-2320-364-34-2
12-42
12-8. STEERING SYSTEM ALIGNMENT AND ADJUSTMENT (CONT).
NOTE
Perform all of these tasks whenever suspension components or axles are replaced.
a.
Front Tandem Axle Alignment.
(1)
Start engine.
(2)
Drive truck straight ahead on a hard, level surface, then back up 20 ft (6 m) and coast to a stop.
(3)
Shut OFF engine.
Ensure that truck air pressure is at 125 psi (862 kPa) and valve to air bag is open.
Suspension alignment must be performed with truck unloaded or alignment will not be
accurate and could cause damage to equipment during operation.
NOTE
Do not apply parking brakes at this time.
(4)
Chock rear tandem axle wheels.
NOTE
Distances should be measured
from the outside of frame rail to
the inside machined surface of
suspension beam hanger.
(5)
With the aid of an assistant, at right front of
Axle No. 1, hold plumb-bob from center of
frame straight down to floor and scribe line
on floor.
(6)
With the aid of an assistant, at right rear of
Axle No. 2, hold plumb-bob from center of
frame straight down to floor and scribe line
on floor.
(7)
With the aid of an assistant, using a
chalkline box, snap a line from Axle No. 1
scribe mark to Axle No. 2 scribe mark.
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