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Unread 02-25-2016, 01:49 PM   #1
Not Yet Wild
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Join Date: Aug 2010
Location: Crete IL
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Default 1979 motor

I just replaced all the solenoids on my 1979 caroche even though only one was bad. It now runs great in reverse but very sluggish forward. like the batteries are bad, though the're fine and charged and the wires have all been upgraded. the guy who helped me with the solenoids said the reverse fine and forward bad thing is usually a sign the motor is bad. it is after all a 37 years old motor so I'm ok if that's the case. My question is should I have it rewound or replace it??? and if I replace it, with what??? I'll never find anouther 79 motor...I've been checking for the past month. can I use a newer 36 volt motor??? any help will be appreciated. PS... it has been getting slower in forward the past few years.. even before the solenoid issue.
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Unread 02-25-2016, 02:31 PM   #2
Not Yet Wild
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Default Re: 1979 motor

are you sure the cables on the motor are on the correct posts?
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Unread 02-25-2016, 02:54 PM   #3
Not Yet Wild
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Default Re: 1979 motor

yes...same as when i bought it 7 yrs ago.
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Unread 02-25-2016, 03:37 PM   #4
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Default Re: 1979 motor

If it is the motor, it probably only needs brushes and a cleanup of the commutator. That should not cost that much to have done at a motor shop. If it runs well in reverse, the motor can't be that bad.
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Unread 02-25-2016, 05:25 PM   #5
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Default Re: 1979 motor

Do all the batteries come into play on this model cart? I've never seen one. But it sounds as though the forward is getting the power for reverse and reverse is getting the forward power??
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Unread 02-26-2016, 09:16 AM   #6
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Default Re: 1979 motor

I am having a hard time believing that an electric series motor will run in One Direction fine and not the other direction simply by reversing the flow I suppose there's always that possibility but you have other problems
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Unread 02-26-2016, 09:28 AM   #7
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Default Re: 1979 motor

The way this can happen is if the brushes and commutator are worn and making bad contact when rotating one direction vs the other. I have seen motors do that but it is not a common cause of this problem. Much more likely to be something else.
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Unread 02-26-2016, 10:03 AM   #8
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Default Re: 1979 motor

I think it may be getting lower voltage in forward wired that way somehow???
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Unread 02-26-2016, 10:12 AM   #9
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Default Re: 1979 motor

Quote:
it has been getting slower in forward the past few years
Probably one of the batteries that is only used in forward is bad.

The motor is definitely not an issue if it works fine on Reverse.

Measure the individual battery voltages under load to verify.
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Unread 04-19-2016, 12:35 PM   #10
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Default Re: 1979 motor

Bad post on battery....thanks....changed brushes also....runs better now :)
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