34
08
Disassembly and Reassembly
Manual 2008 Rev A p/n 2008
15. Heat the solid gear and the hub of the two-
piece gear to 350°F (177°C). Install the solid
gear and hub onto the rotor shafts. Secure with
washers and cap screws. Do not install the
gear shell at this time. Allow the hub and solid
gear to cool.
Free End Assembly
16. Retighten the six free end plate screws by
hand. Turn the unit over and support it on
blocks with the free end up.
17. Remove the six screws and put jack screws
in holes provided in the flange of the end
plate and remove the end plate. Take out the
1/8 in. (3 mm) shims and check clearance
between the end of the lobes and the housing
using a flat bar and feeler gauges or a depth
micrometer.
18. Install the four O-rings, apply sealant to the
housing or O-ring, reinstall end plate and
secure with cap screws.
Free End Assembly
(Series 55/57/64/66/67/69/81/82)
19. Install seal mating rings using the procedure in
Gear End Assembly on page 33
(step 10).
20. Install bearing using the procedure
in
End Plate Installation (Series
55/57/64/66/67/69/81/82) on page 33
(step
12). Install bearing retainer rings, oil retainer
rings and cap screws.
21. Install mounting feet with cap screws and
stand unit on its feet. For horizontal flow units,
you may prefer to lay unit on its side with the
drive gear to the left. This will make it easier to
take interlobe readings later.
22. Install the gear shell to the hub, making sure
the timing shims are in place and bolts are
tight.
As the second gear is installed, the helical
teeth will cause the rotor to turn. Unless the
rotors are in an open position, they will jam. To
avoid jamming, rotate the installed gear until
the timing mark is at the center and the second
gear with its timing mark is matched to the
timing mark on the installed gear.
Drive Gear
Driven Gear
Figure 8-2 – Timing Marks Matched
Drive Gear
Driven Gear
Figure 8-3 – Timing Marks Advanced 3 Teeth (Reference
Marks Aligned)
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