SQFlex Service Instructions

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5.6 Centrifugal pump type with splined shaft
5.6.1 Dismantling
1. Fit the and tighten the spline pin with screw B
on the mounting plate A.
Note: Make sure that the mounting plate is positioned correctly so that the recess of the mounting plate
and the suction interconnector pos. 14 fit into each other.
2. Place the pump on the mounting plate A
.
3. Unscrew and remove the screws pos. 19 together with the washers pos. 71. Remove the strap pos. 17.
4. Dismantle the pump in the following order until the last chamber has been removed:
• discharge piece pos. 1b
• valve casing complete pos. 1
• nut pos. 19b
• washer pos. 76
• impeller pos. 13
• chamber pos. 9.
5. Pull the pump shaft pos. 16 with priming disc pos. 64 up and out of the suction interconnector pos. 14
and the bottom chamber pos. 10.
6. Lift the suction interconnector pos. 14 and the bottom chamber pos. 10 free of the mounting plate A
.
7. Replace worn wear parts, if any, see section 5.8 Checking and replacing wear parts of centrifugal
pumps on page 51
5.6.2 Assembly
1. Fit the suction interconnector pos. 14 to the mounting plate A
.
2. Press the bottom chamber pos. 10 into the suction interconnector pos. 14.
3. Slide the priming disc pos. 64 over the pump shaft pos. 16 and push until it touches the coupling.
Note: The dogs of the priming disc must point upwards.
4. Fit the pump shaft to the spline pin with screw B
.
5. Fit the first impeller pos. 13 and press it until it engages with the neck ring pos. 7 in the bottom chamber
pos. 10.
6. Fit the chamber pos. 9 and the impeller pos. 13 until the last impeller has been fitted.
7. Fit the washer pos. 76 (with the three grooves upwards) and the nut pos. 19b.
8. Make sure that the top impeller engages with the splined shaft and tighten the nut pos. 19b to the cor-
rect torque, see 5.3
.
Note: Check that the impellers can be raised and lowered, as it is important that the nut is tightened
against the impellers.
9. Fit the valve casing complete pos. 1 and the discharge piece pos. 1b.
Note: Turn the discharge piece so that the slots for the cable guard are located above the screw holes
for the screws pos. 18b in the suction interconnector pos. 14.
10.Lubricate the threads of the screws pos. 19, and fit the straps pos. 17, washers pos. 71 and screws
pos. 19. Tighten diagonally to the correct torque, see 5.3
.
11. Remove the pump from the mounting plate A
and fit the pump to the motor, see section 5.5.2 Fitting
pump to motor on page 48.
sqflex_SI_US_WG.book Page 49 Thursday, October 1, 2009 3:27 PM