(3) position air line tubing against nipple in coupling and tighten nut.
(4) Slide connector nut off tubing onto connector and tighten nut until it is snug against rear of
front crossmember. Then tighten nut at front of crossmember until coupling is secure.
(5) The open side of each air hose coupling should be in a vertical position facing the center of the
trailer. Cover opening with dummy coupling unless connection to air supply is to be made at once.
Air lines and air line fittings are not ordinarily removed except for replacement. Bent, kinked, or damaged
lines and fittings must be replaced. Lines must be kept tightly attached and connected.
Before attempting to remove air chamber, open drain cock on air reservoir
to release pressure from system.
(1) Disconnect flexible air line at air chamber (fig. 4-39).
(2) Disconnect push rod yoke at slack adjuster by removing one cotter pin and clevis pin.
(3) Remove two hex nuts and Iockwashers, from mounting bolts beneath air chamber, and lift
chamber off mounting bracket.
(1) Position air chamber on mounting bracket (fiq. 4-39) and secure with two 5/8 Iockwashers and
5/8-18NF-2 hex nuts, on mounting bolts beneath chamber.
(2) Connect yoke of push rod to slack adjuster with 1/2 X 1-13/64 clevis pin and 1/8 X 7/8 cotter pin.
(3) Connect flexible line to air chamber.
Before attempting to remove relay emergency valve open drain cock on air
reservoir to release air pressure from system.
(a) Disconnect service and emergency air lines and four hose assemblies, leading to air chambers
at elbows in emergency relay valve.
(b) Remove three hex nuts and Iockwashers which secure emergency relay valve to studs in valve
mounting bracket welded to reservoir.
(c) Lift off emergency relay valve and remove O-ring gasket from its seat in valve mounting