Franklin Electric BT4 Series, Owner'S Manual

Page: 7 / 44

MAINTENANCE
Reassembly
7
3. Discharge the motor capacitor by shorting its terminals with the blade of an insulated screwdriver.
IMPORTANT:
Hold the insulated screwdriver only by the handle. Do not touch the metal screw -
driver blade or capacitor terminals.
4. Unscrew motor overload and move it aside without disconnecting its wires.
5. Secure the motor shaft with a 7/16-inch open-end wrench inserted onto the shaft flats.
6. For 3-phase motors only, use a 3/16-inch Allen wrench to turn the shaft screw clockwise and remove
it from the center of the shaft adapter.
7. Unscrew motor shaft adapter from pump end of the motor shaft with a 5/8-inch open end wrench
for use on new motor.
NOTE:
Some single-phase pumps do not have 5/8-inch flats and must be removed with a pair of
vice grips.
Pump Disassembly
1. Separate motor from pump. Refer to steps 1-6 of “Motor Removal” on page 6 .
2. Secure the pump shell and unscrew the discharge head by turning it clockwise with a pipe wrench
and set aside.
3. Push the rubber bearing out from the pump discharge head.
4. Remove the pump shell from the bracket by turning it clockwise.
5. Lay aside the O-ring and discharge spacer.
6. While holding the coupling with a 1-1/8-inch open end wrench, remove the 1/2-inch nut and washer
from the pump shaft.
7. Slide the following components up and off the pump shaft: two hub sleeves, shaft spacer (35 & 45
GPM only), stages (includes thrust washer and impeller assembly).
8. Remove the bracket spacer and O-ring.
9. Slide the two shims and two shaft spacers up and off the pump shaft.
NOTE : 45 GPM pumps have only one shaft spacer.
10. Use snap pliers to take the retaining ring off.
11. Slide the washer up and off the shaft.
12. Remove the mechanical seal rotating portion by gently tapping the coupling-shaft assembly from
the pump side of the bracket.
13. Gently tap the stationary portion of the mechanical seal from the bracket using a flat-blade screw -
driver and rubber mallet.
Reassembly
NOTE:
If only replacing a motor, without dis- or re-assembling any part of the pump from the coupling
to the discharge, refer to “Motor Replacement” on page 9 .
Square Flange Motor Shaft Adapter Reassembly
1. Secure the motor shaft with a 7/16-inch open-end wrench inserted onto the shaft flats.
2. Screw on the motor shaft adapter to the motor shaft, using a 5/8-inch open end wrench.
NOTE:
Some single-phase pumps do not have 5/8-inch flats and must be removed with a pair of
vice grips.
3. For 3-phase motors only, use a 3/16-inch Allen wrench to turn the shaft screw counter-clockwise
and tighten it in the center of the shaft adapter.
4. Reposition the motor overload and replace motor canopy.