Milnor 72044SR2, Механические детали и сервисное обслуживание, Страница: 71 / 175

Pellerin Milnor Corporation
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NOTE: Step 2a or 2b below will cause the bearing housing to slide away from the
shell. Shims were placed under one or more of the three bearing housing pads during
factory assembly to align the housing and insure its being exactly parallel with the
shaft.
When removing the bearing housing, be sure to keep these shims separate
and identified so that they may be returned to their proper location, otherwise
the bearing and seal will be out of line and may be damaged after a short operat-
ing period.
As a precaution in case the shims are lost during disassembly, you will
find stamped next to the bearing housing the proper thickness of shims required (if
any) under each adjacent bearing housing pad. The stamped number indicates the shim
thickness in thousandths of an inch. For example, the number “38” indicates that 38/
1000 (.038") shims would be required under this pad.
a. Tighten all four hex nuts on the threaded rods such that the pulling fixture plate is pressed
against the shaft end. With an impact wrench, tighten down on the center bolt until the
housing slides out, or
b. If no impact wrench is available, simply continue to tighten down on each of the four hex
nuts behind the pulling fixture plate, alternately and progressively, until the housing slides
out. It may be necessary to place a spacer (approx. two inches long) between the plate and
the shaft to provide enough clearance between the plate and the bearing housing.
3. Once the bearing housing is free of the shell, carefully slide it off of the guide rods and place
on a clean work surface.
4. The seal sleeve will almost always remain on the shaft when the housing is removed. Remove
the seal sleeve taking care not to damage or scar it and place it on a clean work surface.
Precautions for Bearing Replacement
BNWVUM02.C02 0000278703 A.4 A.5 3/16/20 8:35 AM Released
The most important ingredient in successful bearing and seal installation is cleanliness . The bear-
ing housing must be free of all
foreign
matter. The grease and leak off passages must be blown
clear and all foreign matter removed. You must have a clean work area. Keep your hands and
tools free from grit and grime. Wash your hands before starting and as required during these pro-
cedures.
Foreign matter is, without doubt, the most frequent cause of bearing failure, and one
over which the manufacturer has no control.
Where cleaning is required, bearings, bearing housings and seal sleeves may be cleaned with the
following solvents or cleaning agents (in strict accordance with the manufacturer’s recommenda-
tions as such substances are generally toxic and/or explosive under certain conditions):
Benzene Gasoline Naptha
Chlorethane Kerosene Tricholorethylene
Freons
Mineral Spirts
Do not, however, expose any components to the above substances for more than 24 hours and on-
ly use at room temperature. Never use the following solvents or cleaning agents: alcohols, cre-
sols, phenols, flouro propanols, or other similar chemicals or mixtures.
NOTE:
Hammer blows, overheating, or improper use of force can damage precision
parts.
Drive Assemblies