Bendix Commercial Vehicle Systems VM-3 FIREWALL MANIFOLD 4/04 - Manual (Page 4)

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BW1576 © 2004 Bendix Commercial Vehicle Systems LLC. All rights reserved. 4/2004 Printed in U.S.A.
DISASSEMBLY
Block the wheels and drain the air brake system. Remove
air lines and remove manifold from vehicle.
Remove the large cap nut at port No. 1 and remove the
double check shuttle.
Remove the four machine screws from the PR-4 ™ valve cover.
(Caution - the cover is spring loaded.) Remove the PR-4 ™
valve piston assembly. Do not attempt to remove the retaining
ring and stem from the piston.
ASSEMBLY
Before assembly, lubricate all o-rings, bores and mating
surfaces with BW-650M lubricant pc. no. 291126 (Dow
Corning 55M). Replace any worn or deteriorated o-rings and
shuttle, item 2 in Fig. 5, if necessary.
Install shuttle in guide in body and install cap nut
After cleaning and lubricating, assemble the PR-4 ™ valve
section, replacing o-ring item 3 and inlet exhaust valve item
4 in Fig. 6 as required.
Replace valve on vehicle and check per operating and
leakage tests.