National Vacuum Equipment 607 challenger series Replacement And Rebuild Manual page 15

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18� Inspect the original vanes for
any delamination, chipping
or other damage�
A new vane is flush with the
outside diameter of the rotor�
If any of the vanes are worn
more than 1/4", chipped or
delaminated they should be
replaced�
We highly recommend replac-
ing vanes in sets� Apply a liberal
amount of lubricant to the vanes
before installing in the rotor slots�
It is always a good idea to have
a spare set of replacement
vanes on hand to reduce pump
downtime�
19� Shift the housing so that
the intake (Square port) is
hanging slightly off of the
rebuild work surface�
Place one of the 0�007" shims
between the rotor and rotor
bore so that the shim is within
the housing and will not inter-
fere with the endplate when
they are reinstalled�
Divert the pull wire into the
housing cavity and out through
the intake port�
Repeat for both ends of the
rotor�
607 Challenger Series | 15