> Instructions Specific To Correctly Positioning The Drive Collar on a TOP-FLO® C-Series Centrifugal Pump – discussion with Jim McCormick (Applications and Technical Engineer at Top Line)

Step 1: Before beginning, follow your company’s lock-out/tag-out procedure. Wear proper PPE. Reference the Top Line maintenance manual online for additional safety precautions and technical information at topln.co/pumpmanual. Step 2: Insert the O-ring into the carbon (no lubricant). Install the spring, cup and carbon w/O-ring onto the drive collar to create one assembly and slide it onto the stub shaft. Be sure that the “slot” in the cup aligns with the “pin” on the drive collar. Step 3: Install back plate, casing, and casing gasket and secure with casing clamp. Step 4: Slide the drive collar & seal assembly forward to the back plate until it pushes the carbon/O-ring tight up against the back plate. Now back the drive collar away from the back plate, a distance of approximately 1/32” (.79mm) and tighten the set screws. Step 5: Remove the casing and back plate. If this procedure is done properly, the pump shaft should rotate by hand. If it does rotate, or requires a lot of effort, check to ensure all components are installed and the drive collar is positioned properly.

If you’re working with a “DG” seal, assemble the PTFE gaskets, seal seat, gland ring, and secure to the back plate by uniformly tightening the cap screws. Note: The PTFE inboard (80R) and outboard (80P) gaskets are different thicknesses. The thicker gasket (80R) must always be installed on the impeller side to prevent contact between the impeller hub and the stationary seal.

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