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Page Title: Relay Valve
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TM 5-4210-220-12 4-22 AIR SYSTEM - Continued 4-22.4 Relay Valve. This task covers a.    Removal b. Installation c. Repair TOOLS MATERIALS/PARTS Shop Equipment, Automotive 22, Appendix E Pipe Sealant Maintenance and Repair, NSN 4910-00-754-0705 EQUIPMENT CONDITION Main Engine Shutdown (see para. 2-10) APU Shutdown (see para. 2-12) Batteries Disconnected (see para. 4-24) All Air Tanks Drained WARNING Death  or  serious  injury  could  occur  if  compressed  air  is  directed  against  the  skin.    Always drain all air tanks via the draincocks prior to maintaining the relay valve. NOTE This valve is installed on the frame cross member above the rear axle. REMOVAL (1) Tag and disconnect air lines A, B, C, D and E from relay valve (2) Remove locknuts and remove relay valve from truck (3) Remove all pipe fittings from relay valve ports. Make a sketch that indicates which fittings fit which ports INSTALLATION (1) Install pipe fittings in relay valve ports using sketch as a guide.  Coat all threads with pipe sealant (item 22, Appendix E) prior to installation. (2) Install relay valve on truck using locknuts (3) Install  air  lines  to  valve  ports.    Be  sure  the  air  lines  are  connected  the  same  as  noted  in  step  1  of REMOVAL preceding (4) Reconnect the batteries and start the truck main engine 4-348

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