856 Charging System Question

JWCarp · Apr 21, 2013

The batteries in my 856 seem to be in good shape and start the tractor well. I put a new alternator on last year. This winter the tractor started squaling the belt on the alternator if I ran the engine too fast. I started running it more this spring and the belt stopped squaling but after a while I could smell the batteries starting to boil. What component is bad in the charging system? Could it be the batteries?

Bob M · Apr 21, 2013

Sounds like the alternator is "running wild" and this is overcharging the batteries. Cause is either a failed voltage regulator (most likely) or a fault (open or short) in the control wiring to the alternator.

Allan in NE · Apr 22, 2013

I fought that issue on my 686 for two years.

Damned batteris were sulfated. Cranked good and appeared to be just fine.

A set of new batteries cured it.

Allan

Owen Aaland · Apr 22, 2013

We can all keep guessing what your problem is but until you tell us what the charging voltage is at the batteries we're all just suggesting what the problem may be.

Allan in NE · Apr 23, 2013

If the batteries are boiling, that's a pretty good hint. :>)

Allan

856 Charging System Question

JWCarp

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Bob M

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Allan in NE

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Owen Aaland

Well-known Member

Allan in NE

Well-known Member

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