4-12
F-1013-1118
MAINTENANCE AND LUBRICATION
Triple Axle Air Ride Height
Adjustment for Transport
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 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
(
3.
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.
4.
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
approximately 1”. Reconnect the linkages. Torque to
24-48 inch lbs.
5.
Retighten the 1/4” adjusting lock nuts at the adjusting
blocks to 24-48 in. lbs.
6.
Remove the locating pin.
7.
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.
8.
Move control arms to “down” position, completely
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.
Triple Axle Height Control
Adjustment for Loading
1.
Pull undercarriage out of pockets 18”, dump air, and
tilt trailer up.
2.
Disconnect center axle height control linkage and
dowel pin control arm not to move. Put block between
top of axle and frame, 3-1/2” set ride height
(
3.
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.
4.
On the front axle,
loosen the 1/4” adjustment 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 adjustment.
5.
Retighten the 1/4” adjusting locknuts at front and rear
adjusting blocks to 24-48 in. lbs.
6.
Disconnect front and rear axle linkages from lower
brackets and remove the wood locating pins.
7.
On the front axle,
reconnect linkage to bottom hole
of lower bracket for normal operation. 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.
8.
Return undercarriage to transport position.
9.
Remove wood locating pin from center axle height
control valve and spacer block between axle and
frame. Reattach linkage to bottom hole of lower
bracket. Torque to 24-48 in. lbs.
CAUTION
Ensure suspension air cylinders are inflated on
all axles. Failure to do so can cause excessive
tire wear.