Mikesbucketlistmack Posted January 15, 2014 Share Posted January 15, 2014 Hi fellow Mackaholics ! I'm in the process of changing my original round air horn on my 1980 R 600 to a square rectangular horn. I was wondering if any of you guys know If Mack makes the horn kit and where it is available. I ordered one from a local place that sells used Macks and claims to get authentic Mack parts. When I got it, it was in a box from the "Excel" company and on the bottom of the horn was a sticker that said "made in Taiwain". There was nothing in the box except the horn: no brackets; gaskets; or bolts and when I started to install it the bolt and air connection holes didn't line up with the holes on the roof or the bracket in the headliner. All that was included was a sticker which said "Mack" to stick on the snow shield over the "Excel" writing. Any help would be appreciated. Thanks ! Quote Link to comment Share on other sites More sharing options...
Marcel67 Posted January 15, 2014 Share Posted January 15, 2014 You can order the horns at watts truck with the Mack logo. If the length if you old horns are the same I don't know. So you may have an issue with your holes line up. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post farmer52 Posted January 15, 2014 Popular Post Share Posted January 15, 2014 The rectangular air horns are made by Hadley and the round horns made by Grover.The holes will be different. 3 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
1958 F.W.D. Posted January 16, 2014 Share Posted January 16, 2014 Buell, Hadley and Grover are the three big horn manufacturers. Mack does not make horns. 1 Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment Share on other sites More sharing options...
kscarbel Posted January 16, 2014 Share Posted January 16, 2014 Take a look at Mack part no. 38MR4162. It's a Hadley rectangular single trumpet applicable to R/U/DM models.Note that the air valve will be different from the round Grover air horn you have now, and needs to be changed.If you deal with a Mack dealer on this, ask to see a picture of the mounting arrangement for this horn on their computer. 1 Quote Link to comment Share on other sites More sharing options...
Mikesbucketlistmack Posted January 16, 2014 Author Share Posted January 16, 2014 Thanks, gents, good info. I looked up Watts and they sell American made square horns with the gaskets, pedestal, and hardware. I ordered one and it's on the way.Thanks, again ! Quote Link to comment Share on other sites More sharing options...
Marcel67 Posted January 18, 2014 Share Posted January 18, 2014 Yahoo another happy mack daddy! Quote Link to comment Share on other sites More sharing options...
sodly Posted October 21, 2016 Share Posted October 21, 2016 Speaking of air horns..... Does anyone know when Mack went from round to square horns? Pretty sure I read it on here at one time but I sure can't find it now. I always assumed it was at the Superliner 1 to 2 changeover. But I've seen some 85s RWs with round horns... which is what got me wondering. Anyone know? Is it possible to narrow down the year of a Superliner somewhat just by looking at its horns? I have seen an early Super 2 brochure with round horns but don't know when the change happened. Quote Link to comment Share on other sites More sharing options...
farmer52 Posted October 22, 2016 Share Posted October 22, 2016 15 hours ago, sodly said: Speaking of air horns..... Does anyone know when Mack went from round to square horns? As far as I know, either horn (Hadley or Grover) could be spec'd/ordered. The "standard" horn may have been Hadley (rectangular). 2 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
Vladislav Posted October 24, 2016 Share Posted October 24, 2016 Being at my neck of the woods I'm difficult to became an expert. But from what I saw in multiple Mack sales brochures both trucks with rectangular and round horns were avalible at the same time. Talking to original rectangular horns they were made by Hadley. If Mack sells them there is the sticker almost applied on. If you buy from Hadley dealers the script "Hadley" is right there. And you can buy the sticker from Watts for $1 to make it OEM look. Doesn't save the cost though. Sure in both cases the brackts are included. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment Share on other sites More sharing options...
Underdog Posted October 25, 2016 Share Posted October 25, 2016 Several years ago I tried to get round horns for my CX, Mack could not/would not come up with a anything but Hadley square. Had to go to peterbilt to get the horns I wanted. Quote Link to comment Share on other sites More sharing options...
thomastractorsvc Posted October 31, 2016 Share Posted October 31, 2016 The excel horn is from PAI they come with everything to install the ones I have replaced are or have enough the round ones I bought exact replacements i.e. the 24 inch and they fit the holes and everything just fine. You can buy 2 excel for the price of one Mack through the dealer. If the guy who originally posted this wanted different horns then the holes would not line up seems pretty obvious as far as not having the mounting pieces the place that sold him the horn must have been an open box. I have purchased several and the quality is great chrome plated is nice and it has all mounting hardware. Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
BAD DOG Posted November 6, 2016 Share Posted November 6, 2016 (edited) Round on a Superliner were till 1984 and were made by Grover. From 1985 on they were square and made by Hadley. I just put a set on mine this summer bought them at my local Mack dealer the square ones made came in a Hadley box all the mounting gaskets included with Mack end caps on them just like the factory ones I took off . They cost me $150 Canadian a piece. Watts Mack has them in their site . I'm pretty sure the mounting holes are different between Grover and Hadley horns so if you switch to square ones you might have a few new holes to drill and a few old ones to fill . Edited November 6, 2016 by BAD DOG Spelling error and addition Quote Link to comment Share on other sites More sharing options...
mrgumby Posted November 6, 2016 Share Posted November 6, 2016 http://www.hadleyadvantage.com/products-and-solutions/products/horns Quote Link to comment Share on other sites More sharing options...
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