MCi Crusader II 1989 Maintenance Manual page 392

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MC-9 MAINTENANCE MANUAL
I
f
Figure 12-17. Replacing Valve Core Assemblies.
Notch In S
· Figure 12-18. Replacing Overtravel Lever.
6. Position fork of tool 20-36 so that the shaft can be
inserted in body (figure 12-18). Carefully apply pressure with
clamp
screw.
Compress springs only enough to allow shaft to
be inserted. Install overtravel control shaft (23). Rotate shaft so
that flat is next to piston, and remove tool 20-36.
7. Insert overtravel body plug (25) in bore of body. Force
new plug retainer (33) in position over nylon pivot and body plug
(25).
8. Place new overtravel control body sefll (29) on shoulder .
of body. Slide overtravel assembly into valve body (10). Insert
carefully to avoid seal damage.
9. Place delay pistor.i (5) in valve body with open side of :
piston toward the overtravel shaft (23).
10. Align pin openings in piston and in shaft. Fit piston pin
(11) in tapered side of hole in shaft Tighten pin to 70-80 inch
pounds torque (8.0 to 9.0 Nm).
11. Place intake valve and exhaust valve lever (36) in posi-
tion on overtravel shaft. Make sure the fork on the exhaust lever
side is around stem of exhaust valve core
(14).
Fork should be
high enough on stem so that stem will not be held open. Insert
valve lever screw
(7)
and tighten to 8-10 inch pounds torque (.90
to 1.13 Nm).
12. Spread ends of valve stem lock clip (8) slightly and plac;e
on exhaust valve stem around stem head. Use suitable tool to
brace stem and pinch ends of clip just enough to secure on
stem. Clip must rotate freely on stem.
13. Using new O-ring (17). install air inlet adapter and check
valve assembly {18) into valve body.
14. Make all of the valve assembly adjustments explained
earlier in this section.
SHOCK ABSORBERS
The shock absorbers are double-acting type. They are of
welded construction and cannot be repaired. Defective shock
absorbers must be replaced with new units.
On MC-9coaches prior
to
January 1988, the shock absorbers
at front wheels and at the trailing wheels are identical and may
be interchanged.
OPERATION
The operation of the shock absorber is relatively simple:
Fluid contained within the shock absorber is forced through a
restricted opening by a piston when the suspension air springs
are flexed. The main function of the shock absorber is to regu-
late the vehicle axle travel by dampening the rebound motion.
REMOVAL AND REPLACEMENT
Two styles of shock absorbers are present on the coach.
One type has an eye af each end; the other has an eye at the
upper end and a stud at the lower end. These stud-type shock
iibsorbers are used only at the drive axle. Some of the earlier
coaches have the stud-type shock absorber only in front of the
drive axle; later coaches have them in front and behind the drive
axle.
To remove the eye-mounted shocks, remove the nuts and
washers from the shock absorber mounting pins. Withdraw the
shock absorber assembly fl om the pins.
To remove the drive axle shocks. remove washers and nut
from the eye end. and remove washers. nut and rubber bush-
ings from the stud on the tower end of the shock. Withdraw the
shock from the upper mounting pins. and lift stud end out of
mounting hole iri the suspension support.
New rubber mounting bushings should be used when the
shock absorbers are replaced. This applies to both the eye and
pin connections and to the stud connection.