4-8 ALIGNMENT
4-8.1
Wheel Alignment
DANGER
TO PREVENT A POTENTIALLY LIFE
THREATENING ACCIDENT:
1. SUPPORT SEMITRAILER AND UN-
DERCARRIAGE SO TIRES ARE OFF
THE GROUND.
2. SUPPORT THE SEMITRAILER AND
UNDERCARRIAGE ON JACK STANDS
WITH SUFFICIENT CAPACITY TO SUP-
PORT THE TOTAL WEIGHT OF THE
SEMITRAILER AND ANY LOAD WHICH
IT MAY BE CARRYING.
When semitrailer tires show signs of scuffing,
feather-edging or uneven wear, examine the semi-
trailer for damaged suspension (frame, shocks,
linkage, etc.), axle, wheel bearings and wheels.
Proper wheel alignment and wheel bearing adjust-
ment is essential for proper tire wear. The simplest
form of checking wheel alignment “toe” is by run-
ning the semitrailer over a “SCUFF GAUGE”. A
scuff gauge reading of 16 feet or less per mile is
considered satisfactory. If a scuff gauge is not
readily available, or edge wear on one side of a
tire is occurring signifying positive or negative cam-
ber, alignment can be checked as follows:
a.
Remove wheel, hub and bearing assem-
blies.
b.
Place a 3-point axle gauge against the front
side of the axle, and adjust each axle gauge
point to the axle. (Double point end against
the inner and outer wheel bearing surfaces of
the spindle being checked and the other point
on the inner bearing surface on the other
spindle
(See Figure 4-7).
c.
Move the axle gauge and place against the
back side of the axle. If either of the points of
double point end fails to touch the axle sur-
face, a bent spindle is evident. A point gap of
.015" or more is considered excessive tire
“toe” and the axle must be replaced
(See Fig-
ure 4-7)
.
d.
Follow the same procedures as in
Section
, except place the axle gauge
above and below the axle. If gauge point gap
is found, the axle has positive or negative
camber. The semitrailer axle has no camber
from the factory. If it is found to have positive
or negative camber, axle replacement is nec-
essary
(See Figure 4-8
for examples of cam-
ber).
4-10
Figure 4-6 Air Ride Height Adjustment
Summary of Contents for 336C
Page 3: ...MODEL 336C CAR CARRIER OPERATOR S MANUAL PURCHASED FROM DATE ADDRESS PHONE NO SERIAL NO...
Page 8: ......
Page 24: ...3 12 Figure 3 7 Lining Up the Over the Cab Deck Figure 3 8 Loading the Over the Cab Deck...
Page 28: ...3 16 Figure 3 11 Loading the Lower Deck...
Page 32: ...3 20 Figure 3 13 Rear Impact Guard and Antilock Brake System...
Page 40: ...4 6 Figure 4 3 336C Wiring Diagram...
Page 45: ...4 11 Figure 4 7 Checking Axle for Bend Figure 4 8 Examples of Camber...
Page 50: ...4 16 Figure 4 12 Axle and Brake Assembly...
Page 54: ...4 20 Figure 4 14 Outboard Mount Hub and Drum Figure 4 15 Inboard Mount Hub and Drum...
Page 59: ...4 25 Figure 4 19 Mounting Tires and Wheels Figure 4 20 Stud Tightening Sequence...
Page 70: ...NOTES 5 10...
