Hello Guys,
I just had to replace the bearings in my VX4R.45 4 pole 550 sensorless motor.
Just thought I'd list this info to help anyone going thru the same issues I was noticing.
If your motor has a squeal after you let off the throttle, you may need some bearings. Here are the bearing numbers for the replacements. These are from the Boca Bearing Company, Just google it...
Here are the bearing numbers...
SMR115-ZZ#7 size= 11mm x 5mm x 4mm thk. (drive end bearing)
SR2-ZZ#7 size= .375 x .125 x .156 thk

It takes a .050 allen wrench to remove the (3) screws. Once removed, the cap slides straight out. Be careful not to lose the washer and spring that is on the drive end of the armature.

These have the metal shields like the oem bearings.
Hope This helps
Later