20
It is recommended that the gear end rotor shaft bearings be purchased
from Tuthill Vacuum Systems, as they are specially ground to locate
the rotors with correct end clearance relative to the gear end plate.
Do not use standard bearings which have not been flush ground
within .001 tolerance. Use factory approved parts only.
It is suggested that long feeler gauges (12”) be used to check the
interlobe timing. Preferably (2) .006, (1) .005, (1) .004, and (1) .003.
These gauges will provide all the combinations from .003 to .021,
including .024, which is the total.
Preparation Of End
Plates For Assembly
1) Remove all nicks, scratches, etc. from all sealing surfaces. Clean
all parts thoroughly.
2)
Mechanical Seal Boosters
– Press in new labyrinth seals (51) into
bores of both end plates (4) making sure the scalloped areas of seal
case are aligned with openings in vent area of seal bore. Coat O.D.
of mechanical seal with sealer and press into seal bore, coming to
rest on top of labyrinth seal. Make sure seals are fully seated
without deforming case. Keep sealer from carbon surface.
Carefully wipe carbon with soft tissue and cleaning agent (acetone)
before continuing assembly.
Slinger Seal Boosters
– Press in new oil slinger stators (79) if
required.
3) Stand rotors (1) on arbor press table with gear end shafts up. See
Figure 11. Two keyways should point in the same directions, to
the right.
Figure 11
4) Carefully install gear end plate over rotor shafts.
NOTE:
The drive rotor should always be on the left side. Make
sure the end plate feet are facing in the proper direction so the
assembled unit will have the same drive shaft location as before.
5)
Mechanical Seal Boosters
– Check lapped surface of seal
mating ring to be sure it is perfectly clean. Use soft tissue and
cleaning agent if necessary. Place a few drops of lubricating oil
on its surface and install on shaft with lapped surface coming to
Gear End Assembly
