21. Use new sealing washers (2) for the rotor fastening screws
(1).
22. Screw in the hexagon socket head cap screws (1) using a
suitable hexagon socket wrench and tighten them (1) with a
torque wrench.
M20 steel screws, 10.9 200 Nm (1,770 in-lbs)
M20 stainless steel screws A4-70, A5-70 200 Nm (1,770 in-lbs)
23. Screw the grub screws (9) into the threaded bores on the
front using a 6 mm hexagon socket wrench.
24.
Install the lobe tip or lobe tips (6) according to
Ä
“Removing
and replacing the MIP
®
lobe tips” on page 136.
25. Check that the installed rotors run smoothly
. The easiest way
of doing this is by turning the drive shaft
clockwise with an
appropriate amount of force using a hexagon socket wrench
or a ratchet.
If correct true-running is not obtained, the cause must be
determined and the installation must be corrected.
NOTE!
Smooth running
"Smooth running" means a uniform, trouble-free true-run-
ning (concentricity) without any blocking.
— Providing the pumped medium and materials used allow
this, the rotors can be coated with liquid (e.g. soft soap)
for the smooth running check.
—
When dry, polymer rotors can only be rotated with a cer-
tain degree of force, as they are positioned close to the
pump casing.
26. Attach the cover-side casing protection plate and quick-
release cover in accordance with
Ä
Chapter 6.3.2 “Opening
and closing the quick-release cover” on page 125.
27. Before releasing the rotary lobe pump, check once again that
it runs smoothly by switching the drive on briefly.
If correct true-running is not obtained, the cause must be
determined and the installation must be corrected.
Maintenance and Repairs
BA-Classic FL_en-US, 03.05.2018www.boerger.de / www.boerger.com148
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