TM 5-3810-306-20Section I. SERVICE BRAKES MAINTENANCEAIR SYSTEM PURGETOOLS:General mechanic’s tool kit: automotive (5180-00-177-7033)SUPPLIES:NoneEQUIPMENT CONDITION:Crane wheels are chocked.PURGE:WARNINGHigh pressure air discharge. Do notopen petcocks (1) in a dirtyenvironment. Make sure area is clearof loose dirt, stones, etc. Wear safetygoggles when purging air reservoirs(2).NOTEUse this task to purge primary,secondary and supply reservoirs.Primary reservoir (2) is shown.1.PURGE PRIMARY RESERVOIR (2).a. Slowly turn petcock (1) counterclockwise.b. Let air escape from reservoir (2) a small amountat a time.c. Turn petcock (1) clockwise to close whenreservoir (2) is empty.2.REPEAT STEP 1 FOR SECONDARYRESERVOIR.3.PURGE SUPPLY RESERVOIR.11-2
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