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Suspension Maintenance
Spring Suspension
1. Make certain that all springs are properly located on
the wear pads. Twisted springs or cocked hangers
will cause uneven spring contact with wear pad and
will result in excessive wear on the spring
suspension. Check the shocks for excessive wear.
2. Replacing the equalizer bushings and the torque arm
bushings on the spring suspension is a complex
operation and should be left to trained service
personnel. If the bushings need to be replaced
contact a Landoll authorized service center or the
Landoll factory for servicing.
Air Ride Suspension
1. Physically check all nuts, bolts, and air line fittings for
proper torque (see torque chart below).
2. Check all other suspension components for any sign
of damage, looseness, wear or cracks.
3. 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.
Figure 4-4: Air Ride Height Adjustment
* Air Spring Connections Only.
** First number listed is torque required if bolt head
designated with Neway; Second number listed is torque
required if bolt head designated with Holland Neway.
Air Ride Height Adjustment
(See Figure 4-4 for parts identification)
1. Before adjusting, the vehicle must be empty with the
2. Disconnect linkage at the control arm and raise
3. Position the wood block between the axle tube and
12-1/4" Dia.
16-1/2" Dia.
MAINTENANCE AND LUBRICATION
AIR SUSPENSION TORQUE CHART
Size
1-1/8"-7
** 800 or
35
Torque in
550
Ft. Lbs.
kingpin at operating height and have air supplied to
the trailer.
control arm to the "up" position, raising the trailer until
a block can be placed between axle tube and
undercarriage frame (See Figure 4-4.)
frame according to table below. Block height is
dependent upon suspension ride height and/or axle
brake size.
AIR SUSPENSION
RIDE HEIGHT AND BLOCK
Brake Size
Ride Height
3.5"
5.5"
1/2-13
*3/4-16
3/4-10
35
150
Block Height
5"
7"
4-9
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