(2) All models except M127. Remove emergency relay valve by following procedures shown in steps 1
(a) Position O-ring gasket in its seat in valve mounting bracket.
(b) Position emergency relay valve on studs of valve mounting bracket and secure with three
3/8 Iockwashers and 3/8-24UNF-2A hex nuts.
(c) Connect four hose assemblies leading to air chambers and emergency and service air lines,
to elbows in emergency relay valve.
(2) All models except M 127. Install emergency relay valve by following procedures shown in steps 3
1-Service air line
2-Emergency air line
3-Emergency relay valve-to-reservoir
4-Emergency relay valve-to-air
chamber air line
DISCONNECT AIR LINES
1, 2, 3 and 4 FROM THE
EMERGENCY RELAY VALVE.
DISCONNECTING OR CONNECTING AIR LINES
REMOVE TWO CAPSCREWS
RELAY VALVE TO CROSS-
MEMBER. LIFT OFF VALVE.
POSITION EMERGENCY RELAY
VALVE ON CROSSMEMBER
AND SECURE WITH TWO CAP-
REMOVED IN STEP 2.
CONNECT AIR LINES 1,2,3
and 4 DISCONNECTED IN"
REMOVING OR INSTALLING EMERGENCY RELAY VALVE
Figure 4-49. Emergency relay valve replacement (All models except