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Alternator fit

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Author  [Modern View]

01-11-2018 07:01:15

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I have a 1988 JD 2555 diesel and want to replace the alternator. Parts listings have a 55 and 85 amp listed. How do I know what unit is on the tractor currently? My guess for a duel battery would be 14 volt 85 amp

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01-11-2018 16:44:30

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 Re: Alternator fit in reply to Wildride47, 01-11-2018 07:01:15  
The saddest part about this project is at the high cost of replacing this unit is they no longer come with the pulley and fan installed. I now have to figure out how to get this apart without damaging it. Sigh

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Ronnie Budd

01-11-2018 20:56:08

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 Re: Alternator fit in reply to Wildride47, 01-11-2018 16:44:30  
Just spin the nut holding the fan and pulley off with an impact wrench, then install on the new alternator and seat it with the impact. It's easy, but you'll probably need a thin wall deep socket.

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01-11-2018 07:51:13

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 Re: Alternator fit in reply to Wildride47, 01-11-2018 07:01:15  
It’s an open station. Is there any marking or physical difference between the two types to aid in identifying the difference? Guess the other question would be is there a risk using the 85 amp on the open station. I’d guess the risk would be boiling off the battery with the larger alt.

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Lee B

01-11-2018 08:00:24

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 Re: Alternator fit in reply to Wildride47, 01-11-2018 07:51:13  
No, no risk at all using a larger alternator for a smaller output one. The voltage regulator will output the correct charging voltage at all times - this is their only job and they do it very well for decades at a time or fail entirely. And you will notice the difference right away.

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01-11-2018 07:29:38

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 Re: Alternator fit in reply to Wildride47, 01-11-2018 07:01:15  
If it is an open station tractor, chances are it has the 55 amp. Cab tractor will have the higher output alternator.

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