Flowserve MN - Manual (Page 40)

MN USER INSTRUCTIONS ENGLISH 71569189 11/04
Page 40 of 49
®
Use a tubular sleeve, ring, or small blocks of equal
thickness to apply the force to the cone (inner race).
In forcing a bearing onto a shaft, be careful that the
cone is never cocked.
Check the position of the bearing on the shaft with a
feeler gauge to ensure it is pressing firmly against the
shaft shoulder.
ARBOR PRESS
SHAFT
BEARING CONE
RING ON
CONE ONLY
6.7.4 Bearing end play adjustment
The initial endplay will usually be 0.13 to 0.38 mm.
(0.005 to 0.015 in.). Adjust to the recommended
endplay (as provided in Section 6.7.5) by tightening
the thrust bearing nut as necessary and repeating the
procedure below to check the endplay. If the endplay
becomes less than the recommended endplay, the
thrust-bearing nut must be loosened and the thrust-
bearing cone backed off by pressing if necessary
(due to likelihood of being an interference fit). DO
NOT exceed the static rating of the thrust bearing if
pressing is necessary.
The entire rotating element (bearing frame, stuffing
box head, and impeller) should be assembled before
the bearing endplay is set. The assembly weight is
necessary to properly set the bearing endplay.
a) Mount a dial indicator on the thrust end of the
housing with its arm resting on top of the pump
shaft.
b) With the bearing assembly supported vertically
on the impeller, oscillate the frame to allow the
line bearing rollers to fully seat. If this is not done
false readings will be obtained. Record the dial
indicator reading.
c) Now lift the bearing frame and oscillate the shaft
to allow the thrust bearing rollers to fully seat.
Record the dial indicator reading.
d) The bearing endplay is the difference in readings
in items (b) and (c) above. Repeat (b) and (c)
above to assure measurement consistency.
e) Once the endplay is set, bend over the closest
lock washer tab into one of the thrust bearing
locknut slots. This will secure the bearing locknut
in place.