Mechanical Seal Replacement - dreno Compatta Serie Manual De Uso

12.1 Series Compatta, Alpha V, BIC, AM-AT
A) Remove the impeller in according with the section 10 " Impeller replacement".
B) Using two slot-headed screwdrivers, pull out the old seal, prising first on the revolving part, then on
the fixed ring.
C) Before mounting a new mechanical seal, check the seats are clean, without burrs or rulings, which may dam-
age the mechanical seal or compromise the perfect seal on the shaft.
D) Wet both parties of the mechanical seal with water-soap solution, to insert it easier.
ATTENTION: To push in seat the fixed ring, use a bush (having the same diameter of the shaft), to avoid
jammings that can cause the broken of the fixed ring. Follow with the insertion of the rotating part.
E) Now you can insert and fix the impeller and close the pump.
12.2 Series DNA, DNB, EVO versions
A) Drain the oil chamber in according with the section 11 "Replace oil".
B) Remove the impeller in according with the section 10 " Impeller replacement".
Unscrew the four screws that connect the motor casing to the body pump.
C) Keeping the pump on vertical place, remove the oring between the body pumps and the closing oil
chamber cover.
D) Remove the oil chamber cover
E) Remove the mechanical seal rotation part
F) Using two slot-headed screwdrivers, pull out the old seal, prising first on the revolving part, then on
the fixed ring.
G) Before fitting in a new seal, make sure the housings are clean, with no burrs or scorings which could damage
the seal or in any case reduce the shaft sealing efciency.
H) Wet both parts of the seal with a mixture of soap and water to it it easily.
WARNING: To push the fixed ring into its housing, use a bushing (same diameter as the shafting) to avoid any
jamming which could damage the fixed ring. Then, it in the revolving part.
Now, it in and secure the impeller and close everything again.
I) Fit the oil chamber lange with oring, and close the pump in according with the paragraph "Impeller replace -
ment"
J) Fill up the oil chamber, follower the operation on paragraph 11 (Oil Change)
K) Now you can insert and fix the impeller and close the pump.
12.3 Series GRIX, APX
A) Drain the oil chamber in according with the section 11 "Replace oil".
B) Remove the impeller in according with the section 10 " Impeller replacement".
C) Unsrew the 4 screw that connect the body pump to motor casing and remove the body pump.
D) Using two screwdrivers, remove mechanical seal rotation part
E) Wet both parties of the mechanical seal with water-soap solution, to insert it easier.
ATTENTION: To push in seat the fixed ring, use a bush (having the same diameter of the shaft), to avoid
jammings that can cause the broken of the fixed ring. Follow with the insertion of the rotating part.
F) Now you can insert and fix the impeller and close the pump.

12. Mechanical seal replacement

- 27