Landoll 600C Series, Operator'S Manual

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d. 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.
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 lo-
cating pin.
(See Figure 4-8) .
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.
4-6.3 Triple Axle Air Ride Height Adjust-
ment for Transport (See Figure 4-9)
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 all three control arms
and raise the center axle control arm to the
“up” position, raising the trailer until a spacer
block (3” for 12-1/4 brake) (5” for 16-1/2
brake) can be placed between axle tube and
undercarriage frame.
c. Lower the trailer by exhausting air from the
air springs by moving the control arm to the
“down” position (about 45
o
) until the axle tube
is resting on the block.
d. Return the control arms slowly to the center
position, then insert wood locating pins into
the adjusting block and bracket on the height
control valves. Loosen the 1/4” adjusting lock
nuts located on the adjusting blocks. This will
allow the control arms to oscillate approxi-
mately 1”. Reconnect the linkages. Torque to
24-48 inch lbs.
e. Retighten the 1/4” adjusting lock nuts at the
adjusting blocks to 24-48 in. lbs.
f. Remove the locating pin.
g. 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.
h. Move control arms to “down” position, com-
pletely exhausting system. Then reconnect
lower linkages and torque to 24-48 in. lbs.
The suspension system will return to and
maintain the proper ride height.
4-6.4 Triple Axle Height Control Adjust-
ment for Loading (See Figure 4-9)
a. Pull undercarriage out of pockets 18”, dump
air, and tilt trailer up.
b. Disconnect center axle height control link-
age and dowel pin control arm not to move.
Put block between top of axle and frame,
3-1/2” set ride height.
c. Disconnect front and rear axle height control
linkages at lower brackets. Move control arms
to the center position. Inserting wood locating
pins into the adjusting block and bracket on
height control valves.
d. On the front axle, loosen the 1/4” adjust-
ment lock nuts located on the adjusting block.
Connect linkage to top hole of lower bracket
for proper adjustment.
On the rear axle,
loosen the 1/4” adjustment lock nuts located
on the adjusting block. Connect linkage to
bottom hole of lower bracket for proper ad-
justment.
e. Retighten the 1/4” adjusting locknuts at front
and rear adjusting blocks to 24-48 in. lbs.
f. Disconnect front and rear axle linkages from
lower brackets and remove the wood locating
pins.
g. On the front axle, reconnect linkage to bot-
tom hole of lower bracket for normal opera-
tion. Torque to 24-48 in. lbs.
On the rear
axle, reconnect linkage to top hole of lower
bracket for normal operation. Torque to 24-48
in. lbs.
h. Return undercarriage to transport position.
i. Remove wood locating pin from center axle
height control valve and spacer block be-
tween axle and frame. Reattach linkage to
bottom hole of lower bracket. Torque to 24-48
in. lbs.
CAUTION
INSURE SUSPENSION AIR CYLINDERS
ARE INFLATED ON ALL AXLES. FAIL-
URE TO DO SO CAN CAUSE EXCES-
SIVE TIRE WEAR.
4-15