freightliner Argosy COE Maintenance Manual page 81

33
33–04 All-Axle Alignment
Check
Drive-Axle Alignment Checking
Check the axle alignment, parallelism, and thrust
angle measurements for the rear drive axles. Use the
applicable procedure and specifications in Group 35
of the Century Class Trucks Workshop Manual .
Toe-in Inspection
For vehicle alignment to be accurate, the shop floor
must be level in every direction. The turn plates for
the front wheels must rotate freely without friction,
and the alignment equipment must be calibrated
every three months by a qualified technician from the
equipment manufacturer. Freightliner dealers must
have proof of this calibration history.
1. Apply the parking brakes, and chock the rear
tires.
2. Raise the front of the vehicle until the tires clear
the ground. Check that the safety stands will
support the combined weight of the cab, axle,
and frame. Place safety stands under the axle.
3. Using spray paint or a piece of chalk, mark the
entire center rib of each front tire.
4. Place a scribe or pointed instrument against the
marked center rib of each tire, and turn the tires.
The scribe must be held firmly in place so that a
single straight line is scribed all the way around
each front tire.
5. Place a turn-plate or turntable under both front
tires. Remove the safety stands from under the
axle, then lower the vehicle. Remove the lock-
pins from the gauges; make sure the tires are
exactly straight ahead.
NOTE: If turn-plates or turntables are not avail-
able, lower the vehicle. Remove the chocks
from the rear tires and release the parking
brakes. Move the vehicle backward and then
forward about six feet (two meters).
6. Place a trammel bar at the rear of the front tires;
locate the trammel pointers at spindle height,
and adjust the pointers to line up with the scribe
lines on the center ribs of the front tires. See
Fig. 3. Lock in place. Check that the scale is set
on zero.
33/2
08/29/94
NOTE: B minus A equals toe-in.
Fig. 3, Wheel Toe-In (overhead view)
7. Place the trammel bar at the front of the tires,
see Fig. 4, and adjust the scale end so that the
pointers line up with the scribe lines. See
08/30/94
Fig. 4, Trammel Bar Positioning
8. Read the toe-in from the scale, and compare it to
the toe-in specification in Group 33 of the
Century Class Trucks Workshop Manual . If cor-
rections are needed, see Group 33 of the
Century Class Trucks Workshop Manual for in-
structions on adjusting the toe-in.
Century Class Trucks Maintenance Manual, July 2003
Front Axle
A
B
f330082a
Fig.
f330014a
5.