SQFlex Service Instructions

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5.4 Helical pump type
Helical pumps cannot be separated from the motor as a unit. If the motor or the pump must be replaced,
the pump must be dismantled.
5.4.1 Dismantling
1. Fix the motor in a vice. Note: Tighten only on the area shown in fig. 19.
2. Refer to section 5.9.1 Drawings on page 55. Unscrew the screws pos. 18a and 18b and remove them
together with the cable guard pos. 18.
3. If the motor is intact, the cable need not to be removed. If the motor is defective, remove the nuts for end
cover with socket at the bottom of the motor and pull the end cover with cable and socket out of the motor.
4. Remove the discharge chamber pos. 1a with valve casing complete using the key for discharge cham-
ber F
. Hold the pump by means of the pipe wrench M on the weld just above the upper strainer.
5. Loosen the outer sleeve pos. 55 with pump stator pos. 9 from the motor using the pipe wrench M
on the
weld just above the upper strainer. Hold the motor with the open-end spanner G
.
6. Pull the outer sleeve pos. 55 with pump stator pos. 9 free of the pump rotor pos. 13 and torsion shaft
pos. 16 with a bump.
7. Remove the pump stator pos. 9 and flange pos. 6 by knocking the discharge end of the outer sleeve
hard against a solid wooden surface such as a workbench or table.
8. Remove the torsion shaft pos. 16 from the motor shaft using two ring/open-end spanners K
.
9. Remove the pump rotor pos. 13 from the torsion shaft pos. 16 using the pipe wrench M
. Hold the tor-
sion shaft with the ring/open-end spanner K
.
10.If the parts of the valve casing complete are defective, replace these parts. Prise the retaining ring pos.
7a out of the recess of the discharge chamber pos. 1a and press the parts down and out of the dis-
charge chamber.
5.4.2 Assembly
1. Fill the motor with liquid, see Filling of motor liquid on page 43
2. Fit the pump rotor pos. 13 to the torsion shaft pos. 16 and tighten to correct torque, see 5.3. Hold the
pump rotor using the pipe wrench M
on the cylindrical part below the pump rotor.
3. Fit the torsion shaft to the motor shaft and tighten to the correct torque, see 5.3
.
4. Fit the pump stator pos. 9 with the conical stator inlet against the strainer into the outer sleeve pos. 55 .
5. Fit the flange pos. 6 into the outer sleeve and press it on the upper part of the stator, fixing the stator in
the centre of the outer sleeve.
11SQF-2: Turn the flange pos. 6 with the even surface against the stator pos. 9.
6. Assemble the valve and discharge chamber if it has been dismantled.
• Place the valve casing complete on a plane surface with the bearing pos. 6 downwards.
• Lubricate the O-ring pos. 1d with grease and fit it in the outside recess of the valve casing.
• Press the discharge chamber pos. 1a over the valve casing. Turn the discharge chamber and fit the
retaining ring pos. 7a in the recess of the discharge chamber.
• Grease the thread of the discharge chamber with valve casing complete and screw it into the top of the sleeve.
7. Fit the discharge chamber pos. 1a with valve casing complete and tighten to the correct torque by
means of the key for discharge chamber F
. Hold the pump using the pipe wrench M or fix it in a vice.
The jaws must be placed on the weld just above the upper strainer.
8. Moisten the pump rotor pos. 13 with clean water and fit the pump on the motor. Tighten to the correct
torque, see 5.3
by means of the key for discharge chamber F.
9. Push the end cover with socket and cable into the motor if it has been removed. Fit and tighten the nuts
using the socket for hexagon head screws O
, the adapter for torque screwdriver R and the torque
screwdriver Q
.
10.Fit the cable guard pos. 18. Press the two upper flaps under the outer sleeve and fit the screws pos.
18a and 18b. If the accessible holes in the outer sleeve at the lower strainer are not threaded, they
must be tapped using the tapping screw included in the cable guard service kit and the assembly kit or
by means of an M3 set screw.
11. Test the pump performance using a CU 200 control unit, if available. See section 5.9 Testing the pump
by means of CU 200 SQFlex control unit on page 52
12.Install the pump. See section 2. Start-up on page 22.
sqflex_SI_US_WG.book Page 47 Thursday, October 1, 2009 3:27 PM