If one or both rear wheels on your Knee Scooter have developed a substantial wobble you probably have a bent rear axle. This can be a common problem on the older models of Roscoe Knee Scooter (ROS-KSB). If the axle is bent it is imperative that you discontinue use until the axle has been replaced as extended use with a bent axle will cause the bearings in the frame to fail and could result in injury or reinjury. Recovering on one foot for 4 to 6 weeks is bad enough, no point in extending the recovery period unnecessarily.
HOW TO REMOVE THE ROSCOE KNEE SCOOTER AXLE.
Removing Roscoe axle bearings.
Removing axle bearings can be tricky, especially if the bearing has catastrophically failed or “blown out.” But no need to worry we’ve done the hard work and figured out the easiest way to get them out. If your bearings are still intact simply use the longer side of the old axle slid through the frame from the opposite side to tap them out. However what if the bearing has failed and the outer raceway is stuck in the frame? The answer is simpler than you might think. Simply remove the bearing from the opposite side (it is very rare that both bearings will blow out) as previously stated. Then inserting the old (bad) axle from the opposite side of the destroyed bearing short end first. The hex nut welded to the axle is the perfect size to grab the outer race and you can knock the race out with a little assistance from your hammer. You will find a small metal tube between the axle bearings. This is the bearing spacer, it keeps the bearings from pinching when the new axle is installed so don’t loose it.