4-8.2
Axle Alignment
Proper axle to king pin alignment is necessary
to obtain straight tracking. If axle alignment is off,
“dog-tracking” occurs. Check alignment manually
or by using a semitrailer alignment machine. In ei-
ther case, a thorough inspection of the complete
suspension must be performed and all defects cor-
rected before aligning.
a. Manual Alignment Procedure
1.
Position semitrailer on a firm and level
surface. Insure that the undercarriage is in
the rear most position. Eliminate any
suspension binding due to sharp turns or
unusual maneuvers.
2.
Detach tractor from the semitrailer and jack
the semitrailer up sufficiently to permit
measuring from the underside of the
semitrailer.
3.
Suspend a plumb bob at axle height from
the center of the king pin.
4.
Measure (D) from the plumb bob to the
center point on one end of the axle. Record
this measurement
(See Figure 4-9)
.
5.
Measure (D1) to the other end of the axle in
the same manner as in Step 4. Record this
measurement
(See Figure 4-9)
.
6.
Set D about 1/8" shorter than D1 to insure
proper semitrailer tracking on slope of
road.
7.
Align the rear axle to the front axle. The
rear axle should be parallel with the front
axle, with the dimensions Y and Y1 being
the same.
8.
The suspensions must be in good repair
with no binding or other restrictions before
aligning. All defective parts of the
suspension or axles must be replaced
immediately.
b. Air Ride Suspension
The air ride suspension is aligned and ad-
justed at the factory and it should not be necessary
to align the axles. If, however it does become nec-
essary to align the axles, the procedure is as fol-
lows:
1.
To align air ride suspension axles, locate
the front axles equalizer beam pivot bolt in
front hanger at front end of lock nut.
Loosen the suspension pivot bolt lock nut.
For axle alignment, forward rotate the head
of the pivot head clockwise. For axle
alignment rearward, rotate the bolt head
counter-clockwise.
4-12
Figure 4-9 Checking Axle Alignment
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...
