National Vacuum Equipment WPT 480/P Owner's Manual And Operating Instructions - page 30
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16. Apply a hardening gasket sealer
to the front plate and to the end of the
pump housing.
17. Lubricate the front seal sleeve,
seals and bearing.
18. Slide the rotor into the housing,
making sure the input shaft is
protruding from the drive end of the
housing.
Install the cushion used earlier in the
non-drive end.
19. Install the same number of
endplate gaskets on the housing and
slide the drive endplate onto the drive
end of the rotor.