Pentair MYERS ME40MC-11-CI, Owner'S Manual

Maintenance 

6

Impeller and seal replacement
1.  Remove the oil fill plug and turn the pump upside 

down to drain oil.

2.  Remove the capscrews holding the upper motor 

housing to the lower motor housing; lift off the 
upper motor housing and remove the motor lead 
wires from the connector to detach upper housing 
from assembly. The lead wires are fitted with quick 
connect terminals for this purpose.

3.  Remove the capscrews holding the lower 

motor housing to the volute; lift off the lower 
motor housing.

4.  Hold the rotor shaft assembly and unscrew the 

impeller by turning it counter-clockwise. Remove 
impeller and clean it.

If no more service is needed, reverse instructions 
above to reassemble the pump. Reattach the motor 
lead wires as shown in Figure 2, fill with clean SAE 
5W-15W (ISO 22-44) mineral oil, check the oil level 
and replace fill plug. Oil should cover the top of 
the motor.

Shaft seal replacement
1.  Follow the instructions to remove the 

impeller, above.

2.  Remove the stator capscrews and the spacers (if 

applicable). Lift off the stator.

3.  Remove the seal’s ceramic seat from the shaft 

and tap the body of the seal out of the lower 
motor housing.

4.  Clean the seal cavity thoroughly before installing the 

new seal.

NOTICE Make sure that the seal faces are clean; do 
not scratch or damage the new seal face during seal 
replacement. Apply gasket sealant sparingly to the 
outside edge of seal body before installing the seal in 
the lower motor housing.

5.  Press the new seal body into position in the lower 

housing cavity.

6.  Press the ceramic seat onto the motor shaft. The 

impeller will pull it into position.

7.  Reassemble the stator and tighten the stator 

capscrews. If your pump has a capacitor (Repair 
Parts Ref. 11), be sure the spacer is under it to keep 
it away from the oil in the motor.

 Risk of electric shock. Can shock, burn 

or kill. Discharge capacitor before handling it. 
Electrical shock can burn or kill.

8.  Reassemble the impeller and the pump (reverse 

instructions 1 through 4 in Impeller And 
Seal Replacement).

9.  Install new capacitor.
10. Reattach the motor lead wires as shown in Figure 2.
11. Fill with fill with clean SAE 5W-15W (ISO 22-44) 

mineral oil, check the oil level and replace the oil 
fill plug.

Short Divider

Either Black Wire

Either Black Wire

Green Wire

View

 A-A

(connected between
the two tallest
dividers)

409 0893

Figure 2 - Motor Lead Wires