Landoll 302D-B, Operator'S Manual

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MAINTENANCE AND LUBRICATION
4-13
TABLE OF CONTENTS
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 either case, a thorough
inspection of the complete suspension must be
performed and all defects corrected before aligning.
Manual Alignment Procedure
1. Position semitrailer on a firm and level surface.
Ensure 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
trailer up sufficiently to permit measuring from the
underside of the trailer.
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 4-7 ).
5. Measure (D1) to the other end of the axle in the
same manner as in
Step 4 . Record this
measurement ( See Figure 4-7 ).
6. Set D about 1/8” shorter than D1 to ensure proper
trailer tracking on slope of road.
7. 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.
8. To align axles manually, use a 15/16” wrench and
pipe wrench. Loosen the nuts and bolts,
See Figure 4-8 , and adjust the tie rod until the 1/8”
offset is achieved for road slope. Tighten nuts and
bolts to torque recommendations and remeasure to
ensure adjustment stayed correct. Adjust as needed
to maintain offset.
Figure 4-8: Manual alignment is performed by loosening the bolts and adjusting the rod with a pipe wrench.