Axle Alignment - Landoll 345E Operator's Manual

MAINTENANCE AND LUBRICATION

Axle Alignment

Proper axle to pintle eye 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.
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 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 pintle eye.
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 insure 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.
4-12
Figure 4-7: Checking Axle Alignment
Air Ride Suspension Axles
The air ride suspension is aligned and adjusted at the
factory and it should not be necessary to align the axles.
If, however it does become necessary to align the axles,
the procedure is as follows:
1. To align air ride suspension axles, locate the front
2. Align the front axle using the method outlined in
3. After proper alignment has been obtained, tighten
4. Align the rear axle to the front axle. Locate the rear
5. Tighten the suspension pivot bolt nut to the torque
axle equalizer beam pivot bolt in front hanger at front
end of lock nut. Rotate the head of the pivot bolt. For
axle alignment forward, rotate bolt head clockwise.
For axle alignment rearward, rotate the bolt head
counter-clockwise. Loosen the suspension pivot bolt
lock nut.
"Manual Alignment Procedure" on page 4-12.
the suspension pivot bolt nut to the torque listed in
the table in "Air Ride Suspension" on page 4-9.
axle equalizer beam pivot bolt in hanger at front end
of driver's side rear axle equalizer beam. Loosen the
suspension pivot bolt lock nut. Rotate the head of the
pivot bolt. For axle alignment forward, rotate bolt
head clockwise. For axle alignment rearward, rotate
the bolt head counter-clockwise. The rear axle
should be parallel with the front axle, with the
dimensions Y and Y1 being the same.
listed in the table in "Air Ride Suspension" on
page 4-9.
F-563-0610 Edition