TM 5-3805-262-203-24. ACCESSORIES TROUBLESHOOTING)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. AIR HORN DOES NOT SOUND WHEN HORN VALVE DEPRESSED.Step 1.Install transport/service link to prevent loader from turning.Crack (loosen) tube fitting at air horn.B e f o r e p e r f o r m i n g t h e f o l l o w i n g s t e p s , b e s u r e t h a t t r a n s p o r t / s e r v i cel i n k i s e n g a g e d.Failure to do so could cause serious injury or deathdue to chassis pivoting and crushing you when you are working in areabetween front and rear chassis.Tell assistant to start engine andallow air pressure to build up asindicated by AIR PRESS gage indica-t i o n .Tell assistant to press horn valve.Hissing should be heard from tubefitting connection loosened above.Step 2.a .b .If hissing is heard, remove andrepair air horn (page 10-8).Replace air horn diaphragm ifdamaged (page 10-9).I f h i s s i n g i s n o t h e a r d , t e lla s s i s t a n t t o s h u t o f f e n g i n e.Tighten tube fitting connection loosened above, then go to step2 below.Drain air from air reservoir byopening drain valve located atbottom of air reservoir.Unlock and open front accessdoor .Disconnect air hose connectedbetween horn valve and teef i t t i n g i n s t a l l e d i n p r e s s u reprotection valve port at teef i t t i n g .Connect a zero to 200 psipressure gage to adapteri n s t a l l e d i n t e e f i t t i n g .Close air reservoir drain valve.3-158
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