TM 5-3805-262-20OPERATING TESTOpen air reservoir drain valve to relieve all air system pressure befored i s c o n n e c t i n g a i r s y s t e m c o m p o n e n t s o r l i n e s . F a i l u r e t o d o s o c o u l dcause serious injury .(1)(2)(3)( 4 )(5)(6)Open air reservoir drain valve to relieve air system pressure.Remove one plug from valve upper chamber and install1/2 to 1/8 NPT reducer.Connect zero to 150 psi pressure gage to reducer.Pressure gage hose must be long enough so that youcan read pressure gage in cab.Close air reservoir drain valve.Start engine and operate at idle speed. Continue tooperate engine until air pressure gage indication onleft instrument cluster no longer increases.Slowly press treadle and valve while watching pres-sure gage. Pressure gage shall indicate increasingair pressure as treadle and valve is pressed.(7) Operate engine at 1000 rpm until air pressure gageindication on left instrument cluster no longer in-creases. Press treadle and valve down completely.Pressure gage connected to valve port shall indicateapproximate pressure in air reservoir. Correct pres-sure is approximately 110 psi when treadle and valvei s f u l l y p r e s s e d .(8) Release treadle and valve. Pressure gage connected toindicate zero psi. Turn off engine.v a l v e p o r t s h a llRelieve all air system pressure before disconnecting air system compo-nents or lines. Failure to do so could cause serious injury.( 1 0 ) O p e n a i r r e s e r v o i r d r a i n v a l v e t o r e l i e v e a ir(11) Disconnect air pressure gage from valve port.plug in valve body.(12) Close air reservoir drain valve and close andsystem pressure.Remove reducer and installlock front access door.7-55
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