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|  MIL-P-17639F(SH)
3.2.7.3.2 Bearing brackets for class C-2 pumps shall be either cast inte-
gral with the casing, securely bolted to the casing on a machined shoulder, or
held in alinement with the casing by at least two heavy dowels and securely
bolted thereto. The use of bolts alone for securing brackets is prohibited.
3.2.7 .3.3 Bearing housings shall be cast integral with the bracket or
secured thereto in such a manner as to insure alinement. Bearing housing to
bracket seats shall be machined such that precision of bearing alinement is
insured.
3.2.7.3.4 Bearing lubrication and drain connections shall be located so
as to provide a path which will force new grease into the bearing and direct
old displaced grease out of the drain. Bearing relubrication shall be performed
with the unit secured.
3.2.7.3.5 Hydrodynamic radial bearing shells for oil lubricated bearings
of class C-2 pumps shall be split along the axis and so arranged as to permit
renewal or refitting without removal of the pump rotor from the casing. They
shall be fitted in their housing seat under a light-crush fit and shall have
locking-lips or dowels to prevent circumferential rotation. If they do not have
a crush-fit? they shall be bolted to prevent actual motion. Shells and their
seatings shall be finish machined.
3.2.8 Lubrication.
3.2.8.1 The lubrication of rolling contact bearings shall be in accordance
with FF-B-171, FF-B-185, or FF-B-187, as applicable.
3.2.8.1.1 Rolling contact bearing lubrication method shall prevent bearing
failure resulting from over-greasing. Bearing relubrication procedures shall be
accomplished with the unit secured.
3.2.8.2 Rolling contact bearings having a DN value in excess of 200,000
shall be oil lubricated unless the contractor can demonstrate to the satisfaction
of the design review agency that the specific grease lubricated bearing applica-
tion has been proven in previous Navy shipboard service. Grease lubrication is
preferred where DN is less than 200,000.
Where:
D = Diameter of bearing bore in millimeters.
N = Revolutions per minute (r/rein).
3.2.8.3 Where forced feed lubrication is provided for turbine-driven
pumps, the lubricating system shall be in accordance with the requirements of
the applicable turbine specification (see 3.2.13).
3.2.8.4 Grease lubricants shall be in accordance with DOD-G-24508. Oil
lubricants shall be in-accordance with MIL-L-17331, military symbol 2190-TEP.
The design shall be such that any qualified grease under DOD-G-24508 or oil under
MIL-L-17331, military symbol 2190-TEP, can be used interchangeably with any other
qualified product to the same specification. Bearings shall be capable of being
relubricated without removing the bearings, and shall not require frequent lubri-
cation if the pump is not operated over an extended period of time. Bearing
relubrication procedures shall be accomplished with the unit secured.
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