Loud squeal at top speed, electric precedent
 

I have a fleet of rental carts and 4 of my Precedents make a high pitch squeal at top speed. You can hear it slowly begin around medium speed and by top speed it has become constant. It's driving me crazy more than anything else. Carts drive great but the sound is maddening. I replaced an axle bearing a couple years ago and now it's doing it again, along with 3 others.... Any chance there's a place I can add some oil or grease to make it stop?

Re: Loud squeal at top speed, electric precedent
 

You are supposed to change the gear oil once a year. Have you been doing that?

Re: Loud squeal at top speed, electric precedent
 

Worn motor brushes.

Re: Loud squeal at top speed, electric precedent
 

Had that happen many times and all but once it was brushes. You can jack up the rear and run the cart and verify it is from the axle or motor...