ShopBot PRS Assembly Manual Page -28
Attach the Lower Wheel Bearings on the YZ-Car
With the YZ-Car in position riding on its upper wheel bearings, you can install the lower
bearings. Study the diagram below because the parts in this assembly need to be installed
exactly as indicated. Note that the assembly incorporates an eccentric bushing (having an
off-center hole), which will be used for the final adjustment of the bearing. This bushing has
a small precision washer behind it. This washer is critical for the alignment of the car and
for the normal operation of the bearing. (We’ve put extras in the “Extra” bag, just in case
you might drop one.)
• Insert the bushing into the wheel bearing, then insert the bolt so it protrudes just far
enough through the bushing to hold of the precision washer.
• The trick to the whole operation is to slide the wheel in from the side of the car, after
you have placed the ‘V’ of the wheel over the track. When you get the wheel directly
behind the hole in the car, push the bolt through.
• After pushing the bolt into place, put the washer on, and start the lock-nut. Leave
the assembly loose while you install the wheel bearing on the other side.
• When both wheels are in place, make sure that both are fully seated on the rail.
• Find the black mark on the edge of the eccentric bushing indicating the narrowest
spot. Put this side closest to the rail. Then, tighten down the ¼” bolt with 7/16”
wrenches.
PRSAssembly080922.doc Copyright 2007,2008 ShopBot Tools, Inc
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