Suspension Maintenance - Landoll 334C Operator's Manual

4-7 SUSPENSION MAINTENANCE

4-7.1 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
Size 1-1/8"-7
Torque in
800
Ft. Lbs.
* Air Spring Connections Only.
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 axle controls all air springs.
4-7.2 Air Ride Height Adjustment. (See Fig-
ure - 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 -).
c. Position the wood block between the axle
tube and frame according to table below.
1/2"-13 *3/4"-16 3/4"-10
35 35
RIDE HEIGHT AND BLOCK
Brake Size
12-1/4" Dia.
d. Lower the trailer by exhausting air from the
air springs by moving the control arm to the
150
"down" position (about 45°) until the axle tube
is resting on the block.
e. Check the ride height to make sure it is cor-
rect. Consult Landoll Service Center if correct
height cannot be obtained.
f. 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 -).
g. Align the control arm linkage to the control
arm lower bracket and re-tighten the 1/4" ad-
justing lock nut to 2-4 ft.lbs. The ride height
valve should now be correctly adjusted.
h. Remove the locating pin.
i. The block can now be removed by using the
height control valve as an improvised jack by
disconnecting the control arm at the lower
bracket and pushing the control arm to an
"up" position.
j. Remove the block and reconnect the link-
age. This allows the Automatic Height Control
Valve to resume normal operation.
k. Check the air ride height. If necessary, go
through the adjustment procedure again until
the proper air ride height is achieved.
l. Check the air ride height periodically and
adjust as needed.
AIR SUSPENSION
Ride Height Block Height
3.5" 4-1/2"
4-9