freightliner COLUMBIA CL112 Maintenance Manual page 69

32
• Do not attempt to disassemble the Barksdale
valve body or the control lever. There are no
serviceable parts in the valve, and any disas-
sembly will void the warranty.
NOTICE
When removing or loosening a Barksdale height-
control valve from a mounting bracket, always
hold the valve-side mounting studs in place with
an Allen wrench while loosening or tightening the
nuts that attach the valve to the bracket. Because
the mounting studs are threaded into the valve
body, loosening the nuts without holding the
studs can tighten the studs, which can crush the
valve body and damage the valve. Conversely,
tightening the nuts without holding the studs can
back the studs out, causing a separation of the
two halves of the valve body, and possibly a leak.
1. Park the vehicle on a level surface, using a light
application of the brakes. Do not apply the park-
ing brakes. Shift the transmission into neutral,
and build the secondary air pressure to at least
100 psi (690 kPa). Shut down the engine.
2. Mark the location of the front and rear tires on
the floor, and chock the tires on one axle only.
3. Check the length of the overtravel lever between
its pivot points. See
4
5
05/15/95
A. Measure the length of the overtravel lever between
these two points.
1. V-Shaped Mark
2. Adjustment Locknut
3. Overtravel Lever
Fig. 6, AirLiner Overtravel Lever and Linkage Rod
Measurement
32/4
Fig. 6, Ref. A.
A
1
2
3
f320410
4. Cotter Pin
5. Linkage Rod
3.1 If the vehicle is equipped with an adjust-
able leveling valve, the length should be
8 inches (200 mm). If the length is incor-
rect, see Group 32 of the Columbia
Workshop Manual for adjustment proce-
dures.
3.2 If the vehicle is equipped with a fixed lev-
eling valve, see Group 32 of the
Columbia ® Workshop Manual for the
overtravel lever length for the rear axle
installed in your vehicle.
4. On single-drive rear axle configurations, measure
the distance from the bottom of the left axle stop
to the top of the U-bolt pad. On tandem (dual-
drive) rear axle configurations, measure the dis-
tance from the bottom of the forwardmost left
axle stop to the top of the axle U-bolt pad. See
Fig. 7, Ref. A. The correct distance for single
and dual-drive rear axles is between 2-3/8 inches
and 2-7/8 inches (60 to 73 mm).
1
A
08/16/96
A. Measure height here.
1. Left Forwardmost Axle Stop
Fig. 7, AirLiner Axle Stop Measurement
Columbia Maintenance Manual, February 2010
Suspension
®
f320453