SQFlex Service Instructions

50 / 60
5.7 Centrifugal pump type with cylindrical shaft
5.7.1 Dismantling
1. Fit the mounting plate A
to the suction interconnector pos. 14 by means of the spacing pipe C and the
hexagon socket head screw with washer D
.
Note: Make sure that the mounting plate is positioned correctly so that the recess of the mounting plate
and the projection of the suction interconnector pos. 14 fit into each other.
Fix the mounting plate in a vice.
2. Slacken and remove the nuts pos. 19. Remove the strap pos. 17.
3. Remove the valve housing complete pos. 1 and the top chamber pos. 4 (25 SQF N chamber pos. 9.)
Remove the stop ring pos. 85 of 25 SQF N.
4. Loosen the split cone nut pos. 11 using the key for split cone nut E
. Knock the split cone pos. 12 down
through and out of the impeller pos. 13 using the key for split cone nut E
.
5. Remove the impeller pos. 13, split cone pos. 12, split cone nut pos. 11 and chamber pos. 9.
6. Repeat steps 4. and 5. until all impellers and chambers have been removed.
Remove the stop ring pos. 85 of 75 SQF.
7. Loosen the guide pos. 25 from the recess of the suction interconnector pos. 14 (only 75 SQF). Lift the
suction interconnector off the mounting plate A
.
8. Remove the hexagon socket head screw with washer D
, spacing pipe C and pump shaft pos. 16.
9. Check and replace wear parts, see section 5.8 Checking and replacing wear parts of centrifugal pumps
on page 51.
5.7.2 Assembly
1. Fit the shaft pos. 16 to the mounting plate A
by means of the spacing pipe C and hexagon socket head
screw with washer D
.
Note: Make sure that the mounting plate is positioned correctly so that the recess of the mounting plate
and the projection of the suction interconnector pos. 14 fit into each other.
Fix the mounting plate in a vice.
2. Slide the suction interconnector pos. 14 over the shaft so that the projection of the suction interconnec-
tor engages with the recess of the mounting plate. Press the bottom chamber pos. 10 / guide pos. 25
home in the suction interconnector.
3. Fit the split cone pos. 12, impeller pos. 13 (the impeller collar must point downwards) and split cone nut
pos. 11. Give the split cone nut a few turns. Press the impeller home against the chamber pos. 10 /
guide pos. 25 using the key for split cone nut E
and tighten to the correct torque, see 5.3.
4. Fit the chamber pos. 9.
5. Repeat steps 3. and 4. until all impellers and chambers have been fitted.
Note: For each section, make sure that the chamber and the impeller are fitted correctly before the split
cone nut is tightened.
Note: Fit the stop ring pos. 85 after the middle impeller of 25 SQF and 75 SQF. In 75 SQF the small
recess of the stop ring must be downwards.
Note: The top chamber of 40 SQF and 75 SQF is pos. 4.
6. Fit the valve housing pos. 1 so that the holes for the straining wire are opposite the motor cable (cable
opening in the suction interconnector) and that the slots for the straps are aligned to the points where
the straps are attached to the suction interconnector.
7. Fit the strap pos. 17 and nuts pos. 19. Tighten diagonally to the correct torque, see 5.3
.
8. Remove the pump from the mounting plate A
and fit it on the motor, see section 5.5.2 Fitting pump to
motor on page 48.
9. Check the axial clearance of the pump shaft by measuring the distance between the contact surface of
the suction interconnector and the shaft end using a slide gauge or depth gauge. Measure with the
shaft in its top and bottom position, see below.
25 SQF 75 SQF 40 SQF
TM01 6247 1999
Bottom position H
max
37.5 37.15 37.15
Top position H
min
38.4 39.15 40.15
H
sqflex_SI_US_WG.book Page 50 Thursday, October 1, 2009 3:27 PM