Checking The Shaft Seal; Adjustment Of Impeller Clearance - Grundfos SEG Instrucciones De Instalación Y Funcionamiento

11.3 Checking the shaft seal

Check the oil to make sure that the shaft seal is intact.
If the oil is greyish white like milk or contains a large quantity of
water, the shaft seal must be replaced as the primary part of the
seal is worn. If the seal is still used, the motor will be damaged
within a short time.
If the oil is clean, it can be reused.

11.4 Adjustment of impeller clearance

Warning
Before inspection, make sure that the motor is
switched off and that the mains switch is locked in
position 0.
To adjust impeller, you need to dismantle the grinder system first:
1. See section
11.2 Oil change.
2. Place the pump on horizontal position on a table.
3. Remove the screw (188a) from the pump feet.
4. Loosen the grinder ring (44) by knocking it clockwise with a
punch. See fig. 12.
Fig. 12 Dismantling the grinder ring
5. Remove the grinder ring (44).
6. Insert the punch into the hole to hold the impeller to prevent it
from moving during dismantling.
7. Remove the screw (188a) including lock washer (66) from the
shaft end. See fig. 13.
8. Remove the grinder head (45).
Fig. 13 Dismantling the screw and grinder head
9. Tighten the adjusting nut (68) until the impeller (49) cannot
rotate any more.
10. Loosen the adjusting nut (68) by 1/4 turn.
16
Assembly of grinder system:
1. Fit the grinder head (45). The dogs on the back of the grinder
head must engage with the impeller holes (49).
2. Tighten the screw (188a) in the shaft end to torque of 20 Nm ±
2. Do not forget the lock washer.
3. Fit the grinder ring (44) and turn it 15 to 20 ° anti-clockwise
until it is tightened.
4. Check that the grinder ring does not touch the grinder head.
5. Tighten the screw (188a) to torque of 16 Nm ± 2.
6. Check that the grinder head can rotate freely and noiselessly.