SQFlex Service Instructions

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5. Service of pump and motor

5.1 General information

Helical rotor pumps cannot be separated from the motor as a unit. If the motor or the pump has to be re-

placed, the pump must be dismantled, see section 5.4 Helical pump type on page 47

Position numbers refer to exploded views, sectional drawings and parts lists; tool letters refer to

ection 5.2 Service tools on page 44

5.1.1 Before dismantling

• Disconnect the electricity supply to the motor.

5.1.2 Before assembly

• Clean all parts and check them for fractures and wear.

• Order the necessary service kits and/or parts.

• Replace defective parts by new parts.

• Moisten rubber parts with soapy water before fitting them.

5.1.3 During assembly

• Lubricate and/or tighten screws and rubber parts according to section 5.3 Torques and lubricants on

page 46.

• Before connecting the pump to the motor, fill the motor with GRUNDFOS motor liquid SML 2.

Filling of motor liquid

5.1.4 After assembly

• Test the head and flow according to the test specifications, see section 5.9 Testing the pump by

means of CU 200 SQFlex control unit on page 52.

TM02 5769 3902

Fig. 19. When fixing the motor in a vice, tighten only on the 30 mm wide area starting

37 mm from the upper edge of the motor sleeve.

1. Place the motor in vertical position with an inclination of approx. 10°.

2. Remove the filling plug using a screwdriver or a similar tool.

3. Inject motor liquid SML 2, into the motor with a filling syringe or the like.

4. To allow possible air to escape, move the motor from side to side.

5. Refit the filling plug and make sure that it is tight.

Fit the pump to the motor, see section 5.5.2 Fitting pump to motor on page 48

(centrifugal pump) or section 5.4.2 Assembly on page 47

(helical pumps)

TM01 1434 4597

Fig. 20. Filling of motor

sqflex_SI_US_WG.book Page 43 Thursday, October 1, 2009 3:27 PM