clemson_tiger29678 Posted November 21, 2014 Share Posted November 21, 2014 Odd issue...I've got an old single-horn air horn on my "new" B61. As far as I can tell, the thing is as old as the truck. Blows find when the truck is sitting still, but only has a very faint, short bump when the truck is driving. Any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/37807-air-horn-doesnt-blow-when-truck-is-driving/ Share on other sites More sharing options...
thomastractorsvc Posted November 21, 2014 Share Posted November 21, 2014 maybe the air pushing in the air horn while driving is creating resistance and you don't have enough air pressure coming from the air line to the horn to over come it. What I have found on some air horns is they may stick or get stiff but should work if not leaking air. Sometimes I just blast the horn for awhile and it starts with squeaks and squawks until it frees up than will work fine. 1 Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/37807-air-horn-doesnt-blow-when-truck-is-driving/#findComment-267518 Share on other sites More sharing options...
Freightrain Posted November 21, 2014 Share Posted November 21, 2014 I'd pull the line down off the valve and see what kind of pressure/volume you have. I agree, could be pretty weak and once you have air being jammed back down the diaphram won't respond with the lack of air volume.Make sure the trumpet is screwed firmly to the base. I know mine was loose at one point and was sick sounding. Once I grabbed it and snugged it up, it is crazy stupid loud. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/37807-air-horn-doesnt-blow-when-truck-is-driving/#findComment-267519 Share on other sites More sharing options...
clemson_tiger29678 Posted November 21, 2014 Author Share Posted November 21, 2014 Thanks guys...good advice. I'll check it out tonight! Quote Link to comment https://www.bigmacktrucks.com/topic/37807-air-horn-doesnt-blow-when-truck-is-driving/#findComment-267520 Share on other sites More sharing options...
j_martell Posted November 21, 2014 Share Posted November 21, 2014 Look for any holes....the Rd had wimpy sounding air horns as they were "Swiss cheesed"......"fixed" (100mph tape) em and their better at least. Lol Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/37807-air-horn-doesnt-blow-when-truck-is-driving/#findComment-267543 Share on other sites More sharing options...
41chevy Posted November 21, 2014 Share Posted November 21, 2014 Some times it's as simple as dirty or corroded reed. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/37807-air-horn-doesnt-blow-when-truck-is-driving/#findComment-267557 Share on other sites More sharing options...
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