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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV.



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Unread 07-04-2014, 12:44 PM   #1
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Default 92 marithon no torque

I have a 36 volt 92 marathon and have a problem that just started yesterday. I have had good battery life and enough power but when I got in the cart yesterday, I had very little torque. It will not even start off on a slight grade. Once it is rolling, everything seems ok but no torque on start off. My batteries are reading 39.4 with all batteries from 6.4-6.6 volts. The readings are 2 hours after coming off charge. Any ideas on what the problem could be?
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Unread 07-04-2014, 01:37 PM   #2
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Default Re: 92 marithon no torque

Bad cable, connection or contacts. Anything getting hot?

Starting from a standstill draws the most amps your cart ever draws, so any excessive resistance anywhere in the high current circuit will drop the most voltage when amps are highest.

Could also be a battery failing under load.
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Unread 07-04-2014, 02:56 PM   #3
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Default Re: 92 marithon no torque

Thanks, I will check all the connections. Voltage only drops slightly under load so It must be a connection, contact or wire. All wires are new 4 gage except from controller to motor. I will change them too.
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Unread 07-04-2014, 08:57 PM   #4
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Default Re: 92 marithon no torque

Check if you can push your cart easily with one hand on a paved surface. I'm thinking with a cart that old you might have some friction problems. Starting with the brake shoes.
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Unread 07-07-2014, 06:54 PM   #5
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Default Re: 92 marithon no torque

Ok, I checked all the connections and they are tight, checked POT and it is good, checked each battery under load and none dropped below 6.1. Changed out F & R and nothing changed. Took it for a ride and the only thing that even got warm was the Top cable from the F & R to the controller. No friction problems either.
Any ideas to check next?
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Unread 07-08-2014, 04:40 PM   #6
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Default Re: 92 marithon no torque

Any ideas?
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Unread 07-08-2014, 04:47 PM   #7
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Default Re: 92 marithon no torque

No new ideas from the information you have provided. Do you have any additional information?
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Unread 07-08-2014, 06:46 PM   #8
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Default Re: 92 marithon no torque

Here's another thought. Based on the fact that none of the batteries dropped very much under load you may have a bad motor. (not pulling any or low current) Maybe bad or worn brushes.

Last edited by jjance; 07-08-2014 at 06:47 PM.. Reason: more info
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Unread 07-08-2014, 07:58 PM   #9
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Default Re: 92 marithon no torque

Thanks, how can I test the motor?
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Unread 07-08-2014, 08:05 PM   #10
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Default Re: 92 marithon no torque

Given its age, I would consider tearing it apart, replacing the bearing, cleaning the commutator, and check the brushes and replace if needed. I did that on my 98.

Given your symptoms, The only thing I can imagine causing your problems in a series motor is excessive resistance in the brushes and commutator. Any break in the windings would result in an open circuit, which would mean the motor wouldn't work at all. Shorted windings would probably result in more voltage drop than you are seeing.
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