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Crusader
MC-8
MAINTENANCE
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MANUAL
Apply thin coat of Lubriplate inside guide cap, and
body bores in contact with cap and with diaphragm
guide. Insert spring and O-ring end of inlet valve in
guide cap bore. Force inlet valve down into guide
cap. Place retaining ring in cap groove and snap
around narrow neck of inlet valve.
Insert inlet valve and cap assembly through bottom
of relay valve body. Attach cap to body with four
screws and lockwashers. Tighten firmly.
Place diaphragm guide over stem of mlet valve.
Position diaphragm ring on body aligning match
marks. Place diaphragm on ring, and align by-pass
holes. Install cover aligning match marks. Parts
should ~e aligned, without obstructing by-pass port.
Install six capscrews and lockwashers and tighten to
50-70 inch pounds
(5.65 -
7.91 Nm) torque.
Insert exhaust diaphragm and diaphragm washer
(cupped away from diaphragm) in exhaust port. In-
stall screw and lockwasher and tighten firmly.
13
5
4
3
2
1
REAR BRAKE RELAY VALVE
R-8
DESCRIPTION
Effective Unit No. 30651, a R-8 rear brake relay
valve is mounted on the center of the rear baggage com-
partment bulkhead. Application and release of the
trailing and drive axle brakes is made through the relay
valve. Lines from the dry air tank are connected directly
to the valve providing high pressure air close to the
drive and trailing axle brake chambers at all times. The
relay valve is connected to the brake application valve
(located in front tire compartment) by an air line which
delivers air pressure to the relay valve. The relay valve
provides a rapid application of the trailing and drive
axle brakes and acts as a quick release valve permitting
EXHAUST
COVER
1.
Screw
9. O-Ring Retainer
17. Exhaust Valve Seat
2. Diaphragm Washer
l
0. Inlet & Exhaust Valve
18. Relay Piston
3. Diaphragm
11. Valve Spring
20.
Cover
4.
Exhaust Cover
12. Valve Retainer
21. Capnut
6. Retaining Ring
13. Sealing Ring
22. O-Ring
7. Washer
14. Piston Return Spring
23. Diaphragm
8. Valve O-Ring
15. Relay Piston O-Ring
24. O-Ring
Fig. 4 -
14A:
R-8 Rear Brake Relay Valve
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