4-8 ALIGNMENT
4-8.1
Wheel Alignment
DANGER
TO PREVENT A LIFE THREATENING
ACCIDENT:
1. SUPPORT TRAILER AND UNDER-
CARRIAGE SO TIRES ARE OFF THE
GROUND.
2. SUPPORT THE TRAILER AND UN-
DERCARRIAGE ON JACK STANDS
WITH SUFFICIENT CAPACITY TO SUP-
PORT THE TOTAL WEIGHT OF THE
TRAILER AND ANY LOAD WHICH IT
MAY BE CARRYING.
When trailer tires show signs of scuffing,
feather-edging or uneven wear, examine the trailer
for damaged suspension (frame, shocks, linkage,
etc.), axle, wheel bearings and wheels. Proper
wheel alignment and wheel bearing adjustment is
essential for proper tire wear. The simplest form of
checking wheel alignment “toe” is by running the
trailer 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 avail-
able, or edge wear on one side of a tire is occur-
ring signifying positive or negative camber, align-
ment 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 trailer axle has no camber from
the factory. If it is found to have positive or
negative camber, axle replacement is neces-
sary
(See Figure 4-8
for examples of cam-
ber).
4-8.2
Axle Alignment
Proper axle to pintle eye alignment is neces-
sary to obtain straight tracking. If axle alignment is
off, “dog-tracking” occurs. Check alignment manu-
ally or by using a semitrailer alignment machine. In
either case, a thorough inspection of the complete
suspension must be performed and all defects cor-
rected before aligning.
4-10
Figure 4-6 Air Ride Height Adjustment
Summary of Contents for 334C
Page 3: ...MODEL 334C 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 Model 334C 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...
