MAINTENANCE
Reassembly
8
Pump Reassembly
Mechanical Seal Replacement
1. Insert a new stationary portion of the mechanical seal.
• Lubricate seal with soapy water to ease installation.
• Wear gloves to avoid contaminating the seal face.
2. Apply Loc-Tite 271 to the threaded end of the shaft and screw the shaft into the coupling.
3. Apply one drop of Loc-Tite 243 to each set screw and screw them just far enough into the ID of the
coupling so as to allow for alignment with the motor shaft keyway.
4. Install the coupling-shaft assembly on the motor, lining up the shaft adapter keyway and ensuring
that the coupling is fully seated on the motor shaft.
NOTE:
For square flange motors, the motor shaft must have the motor shaft adapter already
“Square Flange Motor Shaft Adapter Reassembly” on page 7
.
5. Place the bracket on top of the motor-coupling-shaft assembly, aligning the flange- and bracket-
holes.
For 35 & 45 GPM pumps:
• Slide the rubber protector on the curved end of the base.
• Position the other end of the base on top of the bracket so that its holes align with the flange-
and bracket- holes.
6. Bolt the bracket and motor (and, for 35 & 45 pumps, the base) together.
• Square flange assemblies have bolts, lock washers, and nuts.
• The bolts have a torque setting of 115 inch-lbs.
7. While continuing to hold the coupling in position with the screwdriver, tighten the set screws with a
5/32-inch Allen wrench.
• The set screws have a torque setting of 75 inch-lbs.
8. Install the rotating part of the mechanical seal.
9. Insert the mechanical seal washer.
Pump Shaft Assembly
1. Install the retaining ring securely in its groove using snap ring pliers.
2. Slide the two shaft spacers and two shims onto the pump shaft.
NOTE:
45 GPM pumps have only one spacer.
3. Insert the O-ring.
4. Install bracket spacer with the correct side interlocking with the stage assembly.
5. Slide the following components onto the pump shaft: stages (includes thrust washer and impeller
assembly), shaft spacer (for 35 & 45 GPM), two hub sleeves, and shaft washer.
NOTE:
Reinstall the thrusts with the brown-side facing the discharge.
NOTE:
The 35 & 45 GPM shaft spacer is narrower than the shaft spacer(s) on the bracket end of
the pump shaft.
6. Hand tighten the nut onto the end of the pump shaft.
7. Install discharge spacer with the correct side interlocking with the stage assembly.
8. Insert the O-ring.
9. Apply
anti-seize to the pump bracket threads and hand-tighten the pump shell back on, turning it
counter-clockwise.
10. Insert the rubber bearing into the discharge head, aligning the anti-rotation tabs with the slots.
Summary of Contents for BT4 Series
Page 43: ...43 REMARQUES ...
