precedent bandit motor whines like a mother!

smokey tennis shoe

I just installed a plumquick bandit motor, into a completely stock 2009 precedent, IQ.

The cart runs fine, but the motor whines very load while stepping on the go pedal. I mean the noise is pretty loud.

Here is my question :

I am not 100 % sure that I got the 2 heavier wires ( A1 and A2) in the right position. I am second guessing myself. I know the #10 orange goes to F1 and the #10 blue goes to F2.

The wires for the A1 and A2, have been changed and are both black in color. So will the motor run if I have crossed them?

Will it run and whine real loud?

BGW

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jjance

If the A1 & A2 cables are reversed the cart will run in reverse. Same with the F1 and F2.

smokey tennis shoe

Well it runs forward in forward and reverse in reverse. So the wires must be correct then.

Then why do you think it whines so loud?

jjance

Just a wild guess. Maybe the motor came out of the bearing a little bit and it is rubbing a little bit. Did the motor and diff. fit up snug together? Did you have any accidents reinstalling it? Did you use two wrenches tightening the motor connections? Was there any shipping damage? Some things to think about.

smokey tennis shoe

yes it fit up tight. Didn't notice any damage in shipping, but wasn't looking for any.

After installing, I test drove it it seemed fine. The customer drove it play golf today, and that's when the whining appeared.

I remember, that short ell bracket that usualy is below the motor, and bolts to the housing, is not there. So there are only the 3 bolts on the top and side of the motor, installed.

rib33024

Did you install a centering kit in the motor shaft, could be the input shaft bearing went bad

smokey tennis shoe

no I did not, There was nothing wrong with the original motor to start with. I just sent it in for a bandit upgrade for more speed.

I would think when plumquick builds their bandit motors, they install new bearings in them?

And this sound is a high pitch whining, not that terrible grinding noise you get when you need the centering kit??

Sergio

It is most likely due to Magnetostriction in the motor, but it is caused by the PWM frequency used by the controller.

You asked an interesting question about the current flow, I am not sure if it would have any effect on how the laminations in the motor would react, but just in case....

Make sure whatever color wire is on F1 at the motor that it connects to S1 on the controller.

If You have to switch S1 and S2, then switch A1 and A2 as well to keep the rotation the same direction.

smokey tennis shoe

Sergio, I am not following you here. I understand that I should verify the same wire that is on F1, goes to S1, so will check that.

then you say "If you have to", when and why would I "have too"? If I check and the same wire that is on F1 , is also on S1, do I still try switching the wires, or no, I do not have to switch them then?

PLUMQUICK

The motor should slide and bump the rear housing before tightening bolts, if you use the bolts to draw up the motor to the rear housing........this will cause the outboard bearing to have side thrust and go bad. The brushes can and will cause a high pitch whine while in the seating process, this can vary from slight to louder and most likely will go away after driving the cart for awhile. I don't like centering kits......this can put the outboard bearing under side load as well as causing the motor to draw higher amps.