TM 5-3805-262-207-3. AIR BRAKE SYSTEM MAINTENANCE (CONT)g. Air Compressor Assembly(cont).(3) Air Compressor Governor (cont).ADJUSTMENT (SHEET 1 OF 2)Relieve all air pressure before working on air system. Failure to do soc o u l d r e s u l t i n s e r i o u s i n j u r y . If you are injured obtain medical aidimmediately.( a)(b)(c)(d)( e)( f)(g)(h)( i )( j )(k)Open drain valve in bottom of airr e s e r v o i r t o r e l i e v e a i r p r e s s u r e.At top of air reservoir, removesafety valve (1) from tee (2) andinstall 1/4 NPTF street tee (3) int e e ( 2 ) . I n s t a l l s a f e t y v a l v e ( 1 ) ins t r e e t t e e ( 3 ) .Install zero to 150 psi air pressureg a g e i n s t r e e t t e e ( 3 ).Close drain valve in bottom of airr e s e r v o i r .Start engine and operate at idle speed.Watch pressure gage. Pressure indication will increase until air com-pression stops. When pressure indication stops increasing, recordp r e s s u r e i n d i c a t i o n . Pressure indication shall be 105 to 115 psi.Continue to operate engine at idle speed. Apply brakes several timeswhile observing pressure gage indication. pressure indication will de-crease until compression starts. When pressure indication just starts toi n c r e a s e , r e c o r d p r e s s u r e i n d i c a t i o n. Pressure must be 90-95 psi.If pressure indications recorded insteps (f) and (g) above are not cor-rect perform steps (i) through (1)below otherwise go to step (m) below.At governor assembly, loosen lock nut Turn adjusting screw (5) clockwise todecrease pressure setting, or counter-clockwise to increase pressures e t t i n g.Tighten lock nut (4) while holding ad-justing screw (5) using screwdriver toprevent adjusting screw from movingand changing adjustment.7-100
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