Maintenance - MCi MC8 Crusader Maintenance Manual

Crusader
MC-8
[ o,o, ~1=2' - -------"' 8 _ _ _ _ _ _
DATE
MAINTENANCE
Decembe,, 1973 ]
MANUAL
REMOVAL
1. Support body of vehicle by placing blocks under
body by jack points.
2. Open drain cock in air filter and exhaust all air
from system.
3. Disconnect overtravel lever from link and pull
down to exhaust remaining air from air beams.
4. Disconnect both lines from control valve and
cover ends with tape.
5. Detach height control valve from mounting
bracket. Replacement is the reverse of removal.
After assembly, cq_eck for leakage using soap and
water.
HEIGHT CONTROL VALVE AIR LEAKAGE
CHECK
The following procedure is for making air leakage
check when valve assembly is removed from vehicle.
(I) Clean the exterior of valve assembly.
(2) Connect air pressure line to air inlet pOrt, then
open the air pressure (70-100 psi.)
(3) Dip the valve assembly in a container of water,
and watch for air bubbles when the overtravel
lever is in the center position. Refer to Figure I 2-
7: No air should escape from any point of the
valve assembly.
(4)
If
bubbles appear from the bellows port, this is an
indication that the air inlet valve assembly is
defective and must be replaced.
(5) Remove air pressure line from air inlet fitting
and connect it to the bellows port. If bubbles ap-
pear at the air inlet check valve port, this is an in-
dication that check valve unit is defective and
must be replaced.
(6) If bubbles appear at the exhaust port, it is an in-
dication that the exhaust valve assembly is defec-
tive and must be replaced.
(7) If bubbles appear around edge of valve cover
plate, the cover plate gasket should be replaced.
(8) If no leaks are found, remove valve assembly
from the water, then with air pressure still con-
nected to the bellows port, actuate overtravel
lever to remove any excessive amount of water
which may have entered exhaust valve chamber.
Remove air line and connect it to the air inlet
port and repeat operation here to remove water
from the air inlet valve chamber.
HEIGHT ADJUSTMENT
The correct coach body height which should be
maintained is shown in Figures 12-4 and 12-5. It
should not be necessary to make an adjustment at this
point under normal service conditions. However, if
an adjustment is necessary, it is made by changing the
position of the overtravel lever in relation to the
overtravel control body. The lever should be moved
up to raise the level of the coach body, and down to
lower it.
To make this adjustment, shut off air supply to
trailing wheel bellows, check that air pressure is
Figure
12-8:
Overtravel Lever Adjustment
(Front Height Control Valve)
Adjusting Nut ~'
Height Control
~
·.· Bellows,
Valve
j;
~J ":' " ,:-_
~
- ,:::i ~~ --~~\,,
foBellows
0
\(
From Air Tank ~ ) \\
~J
1
\\_
1
·
"' 7
Exhaust Tube /
Link \
Figure 12-SA: Overtrave I Lever Adjushnent
(Rear Height Control Valve)