National Vacuum Equipment WPT 480/P Owner's Manual And Operating Instructions - page 28
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Place the cushion used earlier back into the bore and
install the rotor, making sure the long end of the
rotor is in the proper end of the housing.
14. Remove the bearings and seals.
If your intention is to reuse the bearings, carefully
drive the bearings out using a small hammer and
punch.
Work the bearing out slowly. They can be easily
damaged.
Thoroughly clean the endplate
and scrape off any remaining gasket
material.
Make sure the oil passage
through the endplate is clear.