Landoll 317D, Operator'S Manual

Page: 51 / 88

MAINTENANCE AND LUBRICATION
4-11
Figure 4-4: Air Ride Height Adjustment
Suspension Maintenance
Air Ride Suspension
1. Physically check all nuts, bolts, and air line fittings for
proper torque (see torque chart below).
* 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.
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.
4. The height control valve on right side of center axle
controls ride height for all air springs on triple axle
suspension.
Air Ride Height Adjustment
( See Figure 4-4 for parts identification).
1. Before adjusting, the vehicle must be empty with the
kingpin at operating height and have air supplied to
the trailer.
2. 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 Figure 4-4.)
3. 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.
4. Lower the trailer by exhausting air from the air
springs by moving the control arm to the “down”
position (about 45°) until the axle tube is resting on
the block.
5. Check the ride height to make sure it is correct.
Consult Landoll Service Center if correct height
cannot be obtained.
6. Loosen the 1/4” adjusting lock nut located on the
adjusting block, allowing the control arm to move
approximately 1 inch. Move the adjusting block until
holes align, then insert locating pin
(See Figure 4-4.)
aride345
AIR SUSPENSION TORQUE CHART
Size 1-1/8”-7 1/2”-13 *3/4”-16 3/4”-10
Torque in
Ft. Lbs.
**800
or
550 35 35 150
AIR SUSPENSION RIDE HEIGHT AND BLOCK
Brake Size
Ride Height Block Height
12-1/4” Dia. 3.5" 3"
16-1/2” Dia. 5.5" 5"