Page 14
ENGLISH
Polaris
®
PB4-60 Booster Pump
|
Installation and Operation Manual
6.2.4 Mechanical Seal Replacement
NOTE
This is a two (2) part replacement process.
The
mechanical seal must be replaced as a set.
NOTE
Refer to Figure 10 for an illustration of the
location of the mechanical seal and impeller.
Do not damage the ceramic or carbon surfaces of
the seals. If surfaces are damaged, leaks will occur.
WARNING
1. To access the mechanical seal, follow steps 1
through 6 of
Section 6.2.2, Impeller Removal
.
2. Remove the carbon face seal half from the motor
shaft. Refer to Figure 9. This is a spring-loaded
seal. Grasp the portion of the seal closest to the
impeller body and pull the seal off using a twisting
motion.
3. Remove the motor from the backplate following
the steps in
Section 6.2.5, Motor Replacement
.
4. Place the backplate o-ring side down and force the
ceramic seal out using a screwdriver or drift pin.
5. Turn the backplate o-ring side up and insert the
new ceramic seal side into the backplate. Use
great care to press the seal in squarely with your
fingers. The ceramic is easily damaged and must
be pressed in using only your fingers or soft tools.
Do not use any lubricant other than water and soap
solution.
6. Install the motor following the steps in
Section 6.2.5, Motor Replacement
.
7. Install the backplate following the steps in
Section 6.2.3, Impeller Replacement
.
Figure 9. Replace the Mechanical Seal
Carbon Seal Surface
• Ceramic Face Seal
• Backplate Seal
• Carbon Face/ Spring
Side of Seal
• Impeller Side of the
Mechanical Seal
6.2.3 Impeller Replacement
1. Press the new carbon face seal half (see Figure
9) on the motor shaft using a twisting motion.
Make sure the carbon surface is facing toward the
ceramic ring in the backplate.
VERY IMPORTANT!
Grasp the lower portion of the
seal (opposite the carbon face) when installing the
seal, or it will be damaged.
CAUTION
NOTE
To assist assembly,
only
use water and soap
solution as a lubricant. Any other lubricant will
destroy the seal after a short period of time.
NOTE
Exercise great care to keep the seal and mating
parts clean.
2. While holding the motor shaft with a ½" wrench,
thread the impeller onto the motor shaft.
Hand-tighten the impeller until it is secure.
Do not
overtighten.
3. Replace the motor shaft cover by inserting the
cover tabs into the slots and rotating the cover 90º
clockwise.
4. Install and tighten the screws lightly in a crossing
“X” pattern using a 9/16" wrench, starting with
the inner (middle) four (4) then the outer (top and
bottom) four (4) to draw the backplate to the body
in an even manner. Once all the screws are snug,
torque in the same order to 18 ft-lbs.
5. Open the pressure release valve on the filter, and
make sure it is clean and ready for operation.
6. Switch on the circuit breaker to the pump motor.
7. Turn on the pump and check the system for normal
operation.
8. Once all the air has left the filter, close the
pressure release valve.
Mechanical Seal
Impeller
Backplate
Figure 10. Backplate, Impeller and Mechanical
Seal Location
