Have a heavy-duty commercial floor scrubber 3-4 years old, when accelerating and going faster, experience a timely bump. (If you've ever pushed a shopping cart with a gash in one wheel- it is just like that) Inspection of wheels reveals the are perfectly round and in good shape. Removed wheels and bearings appear fine. Could bearings still be bad even though they make no noise and have no wobble? This machine is very heavy. Parts are expensive, need to be sure before ordering
Did you check........................ 01. tyre outer surface for Flat spots on the wheel balancing machine. 02. rim condition for any defect on the wheel balancing machine. 03.axial and radial play of the wheel on the wheel balancing machine. 04. ball joints and suspension arm rubber bushes. 05. any bending over an accident....... if above are ok fix the wheel to the vehicle and lift that side a little using a trolly jack. hold the wheel from the upper tightly and check for a bearing play by pushing and pulling........
check your suspension joints and mounts
In this application the bearings would either be good or shot. Yours sound good although under load something occurs. What type of bearings are they? Are they sealed or shielded? The problem is probably somewhere else in the drive train like chain, sprocket, belt, pulley, shaft, etc.
