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 > Hadley Air Horns

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Posted: 02/04/12 12:21pm Link  |  Print  |  Notify Moderator

When my Hadley Air Compressor went bad, I just removed the solenoid from my leaking air tank and moved it to the chassis air tank. Now when ever the engine is running my horns work. Best and cheapest repair I did to the air horns.


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Posted: 02/04/12 10:31am Link  |  Print  |  Notify Moderator

I removed the back cover on my Hadley's. One had some crud in it. Screwed it back on and all was well....then.

However, I have not used them for two years, so who knows now?


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Posted: 02/04/12 08:56am Link  |  Print  |  Notify Moderator

trvlnsgt wrote:

Hadley horns are adjustable. While the problem could be any of the situations already mentioned, I would try adjusting them first. Moving the trumpet forward or back,(by unscrewing it), will change the sound. It's more complicated to explain than to actually do. Loosen the trumpet by unscrewing the back piece a bit, move the trumpet by screwing or unscrewing it, (which moves it forward or backward), then tighten the back piece to hold it all in place.


Some may be, but it will depend on which hadley air horn he has.


If it is the "Bully" seris, take off the top chrome piece, there are 2 thin metal discs, and lift them off, look for debris, water, etc.... make sure you know where your parts are, and let loose a blast, with the covers, tin peices off, watch for stuff coming out if possible.


Clean out the "Shell" being sure not top leave any debris inside, IE rag bits, pieces of paper towel etc....


Now, this is assuming there is enough air pressure.

I had a problem with Hadley compresser, the Small "Brass " looking one going bad (plus, it is only rated for 10%, 20 % Duty rating)....IE only 10 min, or 20 min run time PER hour.


I went with a Real nice Viair 3000, or 4000 , can't remember exactaly which seris air compresser......100% duty rated, for LESS than the cost of a Hadley replacement compresser.


Now, I can run the compresser 60, minutes out of every hour, if needed. The solenoid should be attached to your air tank.

Every so often, I have to remove the outlet solenoid, and being sure no air is in the tank, remove the plunge pin, it has a rubber/brass tip. Clean off and re-assemble.

This should cover most issues you may be having.


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Posted: 02/03/12 07:07pm Link  |  Print  |  Notify Moderator

My solenoid was in the front drivers side of the engine compartment however mine is gas so I don't have a clue where yours is located.


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Posted: 02/03/12 08:23am Link  |  Print  |  Notify Moderator

Thanks for the good advice. I think I'll start with pulling the horn covers. Wouldn't doubt if a mud dauber or a tree frog is in there.

If that doesn't fix it, where might the solenoid be located?


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Posted: 02/04/12 08:42am Link  |  Print  |  Notify Moderator

Hadley horns are adjustable. While the problem could be any of the situations already mentioned, I would try adjusting them first. Moving the trumpet forward or back,(by unscrewing it), will change the sound. It's more complicated to explain than to actually do. Loosen the trumpet by unscrewing the back piece a bit, move the trumpet by screwing or unscrewing it, (which moves it forward or backward), then tighten the back piece to hold it all in place.


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Posted: 02/02/12 10:23pm Link  |  Print  |  Notify Moderator

The reply about pulling the horn covers could be your answer. My horns sounded bad and opening them up revealed that mud daubers had made a nest inside and blocked the air flow. I did not find any insects but if any hatched they were probably deaf!


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Posted: 02/03/12 01:01am Link  |  Print  |  Notify Moderator

My air tank shows psi. I would think yours does also. Check the air pressure first then check for obstructions in the trumpet.


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Posted: 02/02/12 07:12pm Link  |  Print  |  Notify Moderator

Perhaps the pressure switch has failed. JC Witney has all the parts you will need. My press switch and solinod up to the horns needed replacing, neither comes with the kit. They are sold seperate.


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Posted: 02/02/12 10:19pm Link  |  Print  |  Notify Moderator

The solenoid where the air hose to the horn attaches is probably dirty. It is a common problem with the Hadley system. You can remove and disassemble it and clean the corrosion out. I did that twice with mine and found that it lasted about 6 months at best.
I finally replaced the solenoid assembly. Cured it for three years so far.

Hadley Solenoid valves

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