National Vacuum Equipment WPT 480/P Owner's Manual And Operating Instructions - page 29
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WPT Series | 29
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15. Install new seals and the bearings.
The seals mount back to back and should be driven to
the bottom of the endplate.
Each bearing should be driven until it makes
contact with the bottom of the endplate.
The bearings are of different
thicknesses, which is apparent upon
inspection. Make sure you are
installing them in the proper endplate.
The heavier bearing goes into the
drive endplate.