EVOLUTION ASSEMBLY INSTRUCTIONS
(Including Impeller and Seal Replacement)
WARNING: ALWAYS DISCONNECT THE ELECTRICAL POWER FROM THE PUMP MOTOR BEFORE
PERFORMING ANY WORK ON THE PUMP UNIT.
To Disassemble Pump:
CAUTION: DRAIN THE WATER FROM THE PLUMBING LINES BEFORE DISCONNECTING THE PUMP,
ALWAYS PROTECT THE MOTOR FROM POSSIBLE WATER DAMAGE.
Removing Suction Cover:
1. Remove the cover by removing the screws securing the cover to the volute (casing). These screws
are located at the perimeter of the cover.
2. Note the orientation of the loose wear ring on the impeller hub before disassembling.
Removing Impeller:
1. Hold the motor shaft from rotating as follows: At the rear of the motor, insert a wide blade
screwdriver in the shaft end slot, or use a needle nose “vise grip” or pliers to hold the shaft between
the motor face and impeller sleeve opening. Caution: Do not grip impeller sleeve.
2. Turn the impeller counter clockwise until it is completely free from the motor shaft thread.
Removing the Volute (Casing) from the Motor:
1. Unscrew the four (4) bolts located at the rear of the motor. These bolts extend through the entire
length of the motor into the 4 legs of the volute.
2. When the 4 legs of the volute are completely disengaged from all the bolts, slide the volute off of
the motor shaft.
Inspecting the Seal:
1. Carefully examine the surfaces of the carbon disk (black rigid part of seal rotating assembly,
mounted on impeller) and the white ceramic ring (at seal stationary assembly on volute) for edge
chipping, surface scratches, or uneven wear. The surfaces should be smooth and free from
damage.
2. The rest of the seal assembly should be free from cracks and should fit snugly with their respective
mating parts.
3. Use alcohol wipes or isopropyl alcohol with clean “lint free” soft cloth to clean the carbon disk and
the ceramic ring surface if reusing the same assemblies.
NOTE: IT IS ADVISABLE TO REPLACE THE COMPLETE SEAL ASSEMBLY (BOTH THE CERAMIC
AND CARBON SIDES) EVERYTIME THE PUMP IS DISSASSEMBLED.
Removing the Seal Assemblies:
1. Remove the seal rotating assembly from the impeller by carefully sliding if off the impeller sleeve.
2. Remove the ceramic ring and rubber boot by knocking it out and/or prying it loose through the rear
opening of the volute. Be sure not to scratch or damage the ceramic surface if you are reusing this
part. Caution must be used so as not to damage the volute wall.
