Dismantling The Mixer; Assembling The Mixer - Grundfos AMD.07.18.1410.3 Service Instructions Manual

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4.1 Dismantling the mixer

4.1.1 Removing the propeller
1. Fit the mixer with the propeller upwards in a vice with soft jaws.
2. Remove the hub screw pos. 1 (left-hand thread).
3. Remove the spring washer pos. 2.
4. Pull the propeller pos. 4 including the lock washer pos. 3 off the shaft.
4.1.2 Removing the seal cover and draining of oil
1. Remove the propeller, see
2. Slacken the screws pos. 13.
3. Remove the seal cover pos. 15 including the screws pos. 13 and the O-rings pos. 14 and 16.
4. Remove the mixer from the vice and pour the oil into a transparent container. Let the oil stand so that
water and oil separate. If the oil contains more than 30% water, the shaft seal must be replaced.
4.1.3 Removing the shaft seal
1. Remove the seal cover, see
2. Remove the rotation shaft seal part pos. 20 using the puller
3. Remove the stationary shaft seal part pos. 21 and the spring pos. 22.
4. Slacken the stationary seat pos. 23 including the O-rings pos. 17 and 18 using a small screwdriver.
5. Remove the seal ring.
6. Remove the O-ring pos. 17.

4.2 Assembling the mixer

4.2.1 Fitting the shaft seal
1. Fit the mixer with the shaft end upwards in a vice with soft jaws.
2. All O-rings should be lubricated with a little oil before being fitted.
3. Fit the O-ring pos. 19 on the shaft.
4. Fit the O-rings pos. 17 and 18 on the stationary seat pos. 23.
5. Place the seal ring pos. 23 with the thick O-ring downwards so that the tab points to one of the screw
holes.
6. Press the seal ring home in the motor.
7. Fit the spring pos. 22.
8. Fit the stationary shaft seal part pos. 21 with the seal face upwards and the tab aligned with the tab of the
seal ring. Take care of the seal face; it must not be exposed to blows or touched.
9. Fit the rotating shaft seal part pos. 20 loosely on the shaft with the seal face downwards. Take care of the
seal face; it must not be exposed to blows or touched.
10. Fit the propeller pos. 4 and the lock washer on the shaft and screw the hub screw (left-hand thread) on
the shaft, but do not tighten.
11. Check that the tab of the stationary shaft seal part is aligned with the tab of the seal ring.
12. Tighten the hub screw so that the rotating shaft seal part pos. 23 touches the recess of the shaft.
13. Check manually that the shaft can rotate freely.
14. Remove the hub screw, propeller and lock washer.
4.2.2 Filling of oil and fitting the seal cover
1. Fill oil through one of the threaded holes for the seal cover.
2. Fit the two thin O-rings pos. 13 on the screws pos. 13, and fit the screws in the seal cover pos. 15.
3. Fit the O-rings pos. 16.
4. Fit the seal cover pos. 15 and tighten the screws pos. 13 with 2 Nm.
4.2.3 Fitting the propeller
1. Fit the propeller pos. 4, lock washer pos. 3 and the spring washer pos. 2.
2. Fit the hub screw pos. 1 and tighten it with 10 Nm.
3. Check that the propeller rotates freely.
GB
26.11.2003
4.1.1 Removing the
propeller.
4.1.2 Removing the seal cover and draining of
6 / 9
oil.
pos.
B.

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