Suspension Maintenance - Landoll 345B Operator's Manual

4-6 SUSPENSION MAINTENANCE

4-6.1 Spring Suspension
a. Make certain that all springs are properly lo-
cated on the wear pads. Twisted springs or
cocked hangers will cause uneven spring
contact with wear pad and will result in exces-
sive wear on the spring suspension. Check
the shocks for excessive wear.
b. Replacing the equalizer bushings and the
torque arm bushings on the spring suspen-
sion is a complex operation and should be left
to trained service personnel. If the bushings
need to be replaced contact a Landoll author-
ized service center or the Landoll factory for
servicing.
4-6.2 Air Ride Suspension
a. Physically check all nuts, bolts, and air line
fittings for proper torque (see torque chart be-
low).
AIR SUSPENSION TORQUE CHART
800
* Air Spring Connections Only.
Figure 4-4 Air Ride Height Adjustment
35 35 150
b. Check all other suspension components for
any sign of damage, looseness, wear or
cracks.
c. With trailer on level surface and air pressure
in excess of 65 psi, all air springs should be
of equal firmness. The height control valve on
right side of front axle controls all air springs
on tandem axle suspensions.
4-6.3 Air Ride Height Adjustment. (See Fig-
ure 4-4 for parts identification).
a. Before adjusting, the vehicle must be empty
with the kingpin at operating height and have
air supplied to the trailer.
b. Disconnect linkage at the control arm and
raise control arm to the "up" position, raising
the trailer until a block can be placed between
axle tube and undercarriage frame (See Fig-
ure 4-4).
c. Position the wood block between the axle
tube and frame according to table below.
Block height is dependent upon suspension
ride height and/or axle brake size.
AIR SUSPENSION
RIDE HEIGHT AND BLOCK
3.5" 5"
5.5" 7"
4-9