Air Ride Height Adjustment - Landoll 380 Operator's Manual

Air Ride Height Adjustment

(See Figure 4-9 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 4-9.)
3. Position the wood block between the axle tube and
frame according to table below. Block height is
dependent upon suspension ride height.
Air Suspension Ride Height and Block
Brake Size Ride Height
17"
16-1/2" Dia.
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.
6. Loosen the 1/4" adjusting lock nut located on the
7. Align the control arm linkage to the control arm lower
8. Remove the locating pin.
9. The block can now be removed by using the height
Block Height
10. Remove the block and reconnect the linkage. This
15-1/2"
11. Check the air ride height. If necessary, go through
12. Check the air ride height periodically and adjust as
Figure 4-9: Air Ride Height Adjustment
MAINTENANCE AND LUBRICATION
Consult Landoll Service Center if correct height
cannot be obtained.
adjusting block, allowing the control arm to move
approximately 1 inch. Move the adjusting block until
holes align, then insert locating pin. (See
Figure 4-9.)
bracket and re-tighten the 1/4" adjusting lock nut to
2-4 ft.lbs. The ride height valve should now be
correctly adjusted.
control valve as an improvised jack by disconnecting
the control arm at the lower bracket and pushing the
control arm to an "up" position.
allows the Automatic Height Control Valve to resume
normal operation.
the adjustment procedure again until the proper air
ride height is achieved.
needed.
4-15