National Vacuum Equipment WPT 480/P Owner's Manual And Operating Instructions page 27

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is .060 inch.
Thoroughly clean the housing and scrape off the old
endplate gaskets.
The side cover gaskets are usually not removed during
a normal rebuild.
12. Thoroughly clean the rotor, paying particular
attention to the slots.
10. Slide the endplate off the rotor
and remove the rotor from the
housing.
Note the number of gaskets.
11. Inspect the housing bore and
renew as necessary.
The pump bore new is 9.840 inches.
The maximum overbore recommended
Inspect the rotor for nicks or
burrs and remove as necessary.
When you are finished the vanes
should slide freely in the slots.
13. Lubricate the housing bore.
WPT Series | 27