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Unread 01-16-2016, 02:08 PM   #1
Not Yet Wild
 
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Default 2007 Prededent Slow....HELP!

Ok...need help from the Gurus. Our cart has all of a sudden gotten slow(half speed). The speed sensor test is working and the MCOR is working fine. What is next? How free should the rear axles turn under no load? It appears to me(when rear is off the ground) that there is some resistance when trying to turn the tires by hand. Is this normal?
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Unread 01-16-2016, 02:18 PM   #2
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Default Re: 2007 Prededent Slow....HELP!

ok...while I was typing my partner got bot rear wheels off and we found a brake drum seized up. Took some effort to get the left rear drum off and the brake assembly is not working. I was hoping the drag was the issue, but press the accelerator and the motor is still being help back. It is laboring/pulsing. Any Idea?
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Unread 01-16-2016, 03:37 PM   #3
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Default Re: 2007 Prededent Slow....HELP!

Check lube in rear end.
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Unread 01-16-2016, 06:27 PM   #4
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Default Re: 2007 Prededent Slow....HELP!

You should be able to push it with one hand.
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Unread 01-16-2016, 06:44 PM   #5
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Default Re: 2007 Prededent Slow....HELP!

Will do fellas. I got the brakes corrected, but thete is still a drag. I will let you know what I find.
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Unread 01-18-2016, 04:13 PM   #6
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Default Re: 2007 Prededent Slow....HELP!

So...I checked the rear diff and it is full and the fluid looks good. Any ideas? Could it be the Curtis controller?
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Unread 01-18-2016, 05:34 PM   #7
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Default Re: 2007 Prededent Slow....HELP!

If it drags when pushing by hand you have something binding, bearing ,motor, etc. with cart in tow it should roll freely. If not we are looking for something binding, even the front wheels. If it rolls free, we may have a bad controller, not putting out enough power, or that power not getting to motor. Also check the resistor on the solenoid. Is it burnt. The solenoid may be going bad and power going through resistor and solenoid not able to carry the amps.
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Unread 01-18-2016, 05:38 PM   #8
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Default Re: 2007 Prededent Slow....HELP!

Quote:
gotten slow(half speed)
If it rolls freely in tow - could also be the speed sensor (edit: oops - should have read more closely).
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Unread 01-19-2016, 08:45 AM   #9
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Default Re: 2007 Prededent Slow....HELP!

Quote:
Originally Posted by mrgolf View Post
If it drags when pushing by hand you have something binding, bearing ,motor, etc. with cart in tow it should roll freely. If not we are looking for something binding, even the front wheels. If it rolls free, we may have a bad controller, not putting out enough power, or that power not getting to motor. Also check the resistor on the solenoid. Is it burnt. The solenoid may be going bad and power going through resistor and solenoid not able to carry the amps.
I jacked up the rear and the motor engages, accelerates, then the motor hits a wall and almost appears to pulse. It sounds like somethimg is killing the power
I am getting 48v at the motor with the pedal to the floor.
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Unread 01-19-2016, 09:16 AM   #10
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Default Re: 2007 Prededent Slow....HELP!

That is exactly what the controller is supposed to do.

As soon as the motor RPM reaches the limit for the programmed speed code, the controller will engage Regen brake to keep the motor from exceeding that RPM.

Since the weight of the cart is not trying to keep the wheels moving, the Regen brake will reduce the speed quite severely, the RPM will drop more than intended by the controller and the controller will again accelerate the motor.

This cycle will continue as long as the pedal is all the way down.

Also, if You just lifted one wheel off the ground, that wheel is now turning at twice the speed it normally turns.
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