LCV [en-US]
35
10.4.2 Nose Gap Adjustment (Frame Size 3 & 4)
CAUTION
Proper locking of the bearing housing end cover is essential to prevent movement of the rotating assembly
during operation. Failure to do so can result in severe vibration and damage to all pump components.
Before adjustment may proceed, the pump wetted
end must be completely assembled. After
supporting the pump assembly in the vertical
position, axial adjustment can be made.
Back off the two locking plates so that the bearing
housing end cover can rotate freely using the
spanner wrench on the adjusting nut.
Tighten the locking plates in the backed off position.
Turn the adjusting nut counter-clockwise until
contact of the impeller is made with the suction
liner. It is helpful to slowly rotate the impeller during
this procedure.
Turn the adjusting nut clockwise, while rotating the
shaft until no rubbing of the impeller with the suction
liner is apparent. Impeller clearance can now be
set. Three turns of the spanner wrench (three
notches per turn) between the two locking brackets
will set the clearance. Once the clearance is
correct, slide the locking brackets back into position
and tighten the bolts.
There should be no gap between the locking
bracket and adjusting nut.
1
Adjust Up - Nose Clearance Adjustment
2
Adjust Down - Impeller Contacts Suction
Plate
3
Adjusting Nut
3
1
2
Summary of Contents for LCV
Page 40: ...LCV en US 40 14 Notes ...
