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Discussion Forum

180 vs 185 Alternator Question

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charles todd

03-14-2011 14:54:29

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Will an alternator and tachometer drive from a 185 work on a 180? Next question is the tachometer and cable different between the 180 and 185. If they are different are the ratios and rotation the same? Could one service the other and read correct. I have read the ratio is 1 : 1.48? I know ya'll have some answers on this one!



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charles todd

03-14-2011 20:38:44

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 Re: 180 vs 185 Alternator Question in reply to charles todd, 03-14-2011 14:54:29  
Thanks guys. I have a parts book for the 180 and I had looked at ACCO online. I have also spent several evenings cross referencing after market parts as well as networking with some salvage yards. What i have noticed is some parts for 180's do not exist any more. Maybe I am spoiled to the after market world of IH.

I know the tachometer itself looks the same but different numbers between 180 and 185, but the after market says it replaces both. The alternator and drive part numbers I believe were the same. What has me concerned is a post on the "Unofficial Allis Chalmers Forum" discussing the after market tach drive.

Some guys took their tach drives apart to count teeth and measured pulleys. OEM is quote, "The crank pulley diameter is 7-5/16, 12/45 tooth count in the gear box and like already mentioned the alternator pulley is 3-3/8." Also they say the after market drives are 14/43 teeth which causes the tach to run about 500 RPM high. So to use an after market drive would need a 4-1/8" pulley to offset the ratio change.

This is why I am confused... Any one buy an after market drive or tach? If so did it work correctly?

I appreciate the help Orange Friends,


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Bob Bancroft

03-14-2011 20:53:02

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 Re: 180 vs 185 Alternator Question in reply to charles todd, 03-14-2011 20:38:44  
I have no experience with the aftermarket stuff. I'm going to guess the difference in alt. from 180 to 185 you found is only the amp. rating. I was surprised just a couple years ago helping a friend on his MF 65, the tach. drive parts on his gen. looked just like the AC stuff used on the alt. However I didn't do any tooth count/comparison. We got everything we needed then from AGCO.

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Bob Bancroft

03-14-2011 18:44:29

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 Re: 180 vs 185 Alternator Question in reply to charles todd, 03-14-2011 14:54:29  
I shouldn't do this, but I'm going to say they are identical. BUT- best verified by Jim350's advice.

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03-14-2011 18:50:24

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 Re: 180 vs 185 Alternator Question in reply to Bob Bancroft, 03-14-2011 18:44:29  
I would also think they would be the same but you never know.

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03-14-2011 15:28:16

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 Re: 180 vs 185 Alternator Question in reply to charles todd, 03-14-2011 14:54:29  
You can view all parts and part numbers to see if they are the same on the Agco Online Parts Books.

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