Re: Alternator won't let diesel engine shut off

Posted by jdemaris on April 26, 2005 at 05:28:20 from (209.23.31.236):

In Reply to: Re: Alternator won't let diesel engine shut off posted by Jon H on April 25, 2005 at 22:36:40:

That's an interesting approach to get an ample charge rate. I know many tractor companies extend the heavy-duty rating of the alternators they use simply by putting large drive pulleys on them, thus cutting down the RPMS they turn. This makes their actual output substantially lower than the manufacturor's rating. Thinking back a few years when Deere was just changing over from Motorola to Delco and/or Nippodenso. We had many problems, especially with tractors running at low engine speeds with headlights on - or planting corn with 6 or more row planters and electric blowers on each row. White had a popular planter for awhile with a 6-8 amp blower on each row - so 6 rows needed around 40 amps to run - and the planting was often at low speed. The Motorolas didn't have the amp capacity. Neither did the standard Delcos (65 amp as I recall). And, to make things worse - the Delcos would trash bearings and brush slip-rings since they don't handle dust very well. The Nippos did much better but we had to put small drive pulleys on them to get their RPMs up. And, the Nippos are expensive. The small pulley can cause a problem of belt slippage, and somtimes you need dual belt drive. With the corn planters, we had quite a few customers mounting a large deep-cycle battery on the corn-planter and charging it before each use instead of trying to rely on an alternator.
The tractor companies buy what is available from the automotive industry, and it seems alternator design has advanced enough now, that there are many high-output alternators available cheap. Problem now is finding one with good sealed bearings for tractor use. I've been using Hitachis off of Subarus, and they hold up MUCH better than the Delcos.

Follow Ups:

• Re: Alternator won't let diesel engine shut off Ken Macfarlane 09:49:58 04/26/05 (0)

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