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Page Title:
Table I. Permission thrust loads. |
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|  MIL-P-17840C(SH)
TABLE I. Permission thrust loads.
Bearing
Revolutions per minute (r/rein)
size
2800
3500
1150
1750
----
----
215
160
305
----
----
215
280
306
----
----
235
255
307
----
----
300
400
308
470
375
350
560
309
400
360
500
310
600
425
470
700
580
312
495
670
530
313
800
3.2.7.3 Anti-friction bearings shall be type 111, class 2, or type 120 in
accordance with FF-B-171. The sizes used for the various frames shall be as
shown on figures 3 and 5.
3.2.7.4 For installations utilizing the pump end bearing as the thrust
bearing, a bearing preload spring shall be provided and shall be installed
against the outer edge of the outer ring of the front end bearing. For
installations using the front end bearing as the thrust bearing, a bearing
preload spring shall be installed against the inner edge of the outer ring of
the pump end bearing.
3.2.8 Lubrication.
3.2.8.1 The lubrication of rolling contact bearings shall be in accordance
with FF-B-171.
3.2.8.2 The rolling contact bearing lubrication method shall prevent
bearing failure resulting from over-greasing. Bearing relubrication procedures
shall be accomplished with the unit secured.
3.2.8.3 Grease lubricants shall be in accordance with DOD-G-24508. The
design shall be such that any qualified grease under DOD-G-24508 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 lubrication if the pump is not operated over an
extended period of time.
3.2.8.4 Thrust bearing housings shall be so designed that the thrust
bearing will be adequately lubricated immediately when the shaft starts to turn.
This shall be accomplished by properly locating lubricant supply and drain
fittings and by adequate sealing of the bearing housings so that, regardless of
length of time the units are idle, an adequate supply of lubricant will remain
in the bearing housings.
8
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