Checking The Motor - Grundfos SQ Service Instructions Manual

• 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 discharge chamber with valve casing complete and screw it into the top of the sleeve.
4. Fit the pump shaft complete.
• Grease the lip seal ring pos. 86.
• Fit the pump shaft pos. 16 into the cone for pressure equalization complete pos. 87.
Take care not to damage the lip seal ring pos. 86.
• Turn the priming screw pos. 64 with the cylindrical part (without screw) upwards and fit it on the shaft.
• Place the cone for pressure equalization complete with shaft and priming screw on Fitting tool for
cone for pressure equalization
Make sure that the four projections of the cone engage with the holes in the sleeve.
• If necessary, turn the shaft till the splines engage with the impellers.

4.4 Checking the motor

It is not possible to dismantle motors produced after week 5, 2006
It is only possible to dismantle the motor for analysis, see
2006.
4.4.1 Dismantling
1. Place the motor in a vice, using the two protective clamps
Tighten only on the "A"-marked end of the motor according to table
NOTE: Do not tighten "L"-marked part of the motor due to lack of support.
Motor (P2)
Fig. 6. Tighten area distance.
2. Prise off the filling plug pos. 222a.
Please note that the motor is full of liquid.
3. Screw the top cover (right-hand thread) out of the motor using the ring of the
pos. F.
4. Due to the powerful magnetism of the shaft with rotor, hold the splined shaft end firmly and pull the
shaft with rotor and upper radial bearing pos. 205 out of the motor.
The thrust bearing pos. 203 may come out together with the shaft with rotor.
Check if the thrust bearing pos. 203 is in the motor.
4.4.2 Assembly
1. Fit the thrust bearing pos. 203 with the sliding surface uppermost carefully into the motor.
2. Turn the thrust bearing until its three dogs engage with the three notches at the bottom of the motor.
3. Fit the stop ring pos. 202a on the shaft with rotor with the sliding surface uppermost.
4. Turn the stop ring until the driving dogs engage with the shaft.
5. Hold the splined shaft end firmly due to magnetism and fit the shaft with rotor pos. 202 carefully into the
motor. The shaft with rotor must engage with the thrust bearing.
6. Check the shaft height, see
pos. C. Then press sleeve with chamber stack down over the cone.
Fig. 5. Tighten area.
[kW]
0.70
1.15
1.68-1.85
Fig. 7.Motor shaft
4.4.3 Analysing motors produced after week 5,
pos. B.
Fig. 3.Tighten area
L
A
A
mm
120
156
156
height.
11 / 19
distance.
L
mm
84
102
66
Ring/open-end spanner 1)