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7.4
Mechanical Seal
Mechanical seal stationary and rotating faces should be inspected for signs of wear or cracks and
replaced as necessary.
It is recommended that when reassembling mechanical seal new "O" rings and gaskets be used.
Refer to manufacturers drawing for assembly of mechanical seal.
Refer to mechanical seal section within this manual for further details.
7.5
Throat Bush (If Fitted)
Check the throat bush and replace if required. Note that the bush outside diameter should be the
same diameter as the adjacent impeller wear ring.
7.6
Bearing Handling Information
The ball bearings require correct handling and installation to ensure optimum performance. The
following information is intended as a minimum to ensure that the bearings are handled and
installed correctly.
7.7
Bearing Handling
1.
Do not remove new bearings from their storage package except for inspection, when
stored for a long period of time or just prior to their installation
2.
Work area must be clean to ensure that no dirt or other contaminates will enter the
bearings. Handle bearings with clean, dry hands and with clean, lint free rags. Lay bearings
on clean paper and keep covered. Never expose bearings on a dirty bench or floor.
3.
Do not wash a new bearing. It is already clean and the preservative should not be
removed.
4.
Before mounting, be sure shaft bearing areas are clean and free of nicks and burrs. Check
the dimensions of these areas to ensure correct fit of bearings.
7.8
Bearing Installation
1.
There are two simple methods of providing a heat source for expanding the inner race of
the bearings to facilitate mounting. In the first method, bearings still wrapped in their
original intimate wrap are placed on a shelf in a temperature controlled oven, or in an
enclosure lined with foil and heated with electric light bulbs. A temperature of 150 Degrees
F (66°C) for one half hour should be sufficient.
A second method consists of locating a light bulb (100 to 150 watt) in the bore of the
bearing. The light bulb will heat, primarily, the inner ring and the bearing can usually be
handled by the outer ring without special gloves. Care must be taken to keep the bearing
clean and uncontaminated.