TM 5-3810-306-20R-12 RELAY VALVE REPLACEMENTTOOLS: General mechanic’s tool kit: automotive (5180-00-177-7033)SUPPLIES:Lockwashers (Item 15, Appendix C) (4 Required)EQUIPMENT CONDITIONS: Wheels are chocked.Disconnect ground cable at shunt. (Refer to page 8-109.)Air system is purged. (Refer to page 11-2.)REMOVAL:1.REMOVE R-12 RELAY VALVE (1).a.Tag and disconnect four air lines on R-12 relayvalve (1). Plug air lines.b.Remove two capscrews (3), lockwashers (2)and nuts (4) securing relay valve assembly andbracket (5) to chassis frame. Discardlockwashers (2).c.Remove two capscrews (6) and lockwashers (7)securing R-12 relay valve (1) to bracket (5).Discard lockwashers (11).d.Remove relay valve and fittings from relay valve.INSTALLATION:1.INSTALL R-12 RELAY VALVE (1).a.Install fittings on relay valve and relay valve ontobracket (5). Secure with two capscrews (6) andnew lockwashers (7).b.Align relay valve mounting bracket with mountingholes on chassis and secure with two capscrews(3), new lockwashers (2) and nuts (4).c.Remove tags, plugs and connect air lines to R-12 valve (1).2.CONNECT GROUND CABLE AT SHUNT. (REFERTO PAGE 8-109.)3.START-UP ENGINE AND ALLOW AIRPRESSURE TO BUILD UP. (REFER TO TM 5-3810-306-10.)4.CHECK ALL AIR OPERATED FUNCTIONS.(REFER TO TM 5-3810-306-10.)END OF TASK11-31
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