Shaft Seal Replacement
The Shaft Seal consists primarily of two parts, a rotating member and a ceramic seal. The pump requires
little or no service other than reasonable care, however, a shaft seal may occasionally become damaged
and must be replaced.
Note:
The polished and lapped faces of the seal can be damaged if not handled
with care. Be sure not to scratch or mar the polished surface to prevent leaks.
Pump Reassembly/Installing New Seal
1. Clean the ceramic seat of dirt, grease, dust, etc. Wet the outer
edge of the rubber cup on the ceramic seat with water. Press
the ceramic seat into the seal plate fi rmly and squarely with
fi nger pressure (see Figure 1).
2. Place ceramic seat face up on bench and reclean the cavity if seat does not lock properly.
3. If the seat still does not lock properly, place a cardboard washer over the polished face and
use a piece of 3/4” (19 mm) standard pipe for pressing purposes.
4. Remount seal plate on the motor. Tighten the bolts to 60-80 inch-lbs. (69-92kg/cm) torque.
5. Apply a small amount of liquid detergent to the inside diameter of rotating half of seal.
6. Slide the rotating seal member, polished face last, over impeller sleeve until the rubber drive
ring contacts the shoulder.
Note: Be sure not to nick or scratch the polished seal face. The
seal will leak if the face is damaged.
7. Screw the impeller onto the shaft (clockwise); this will automatically lock the seal in the seal
plate.
Note: On models with an impeller screw: Install the impeller gasket and lock screw
(left-hand thread - turn counter-clockwise). Torque lock screw to 50-55 inch-lbs. (57.6-63
kg/cm).
8. Mount the diffuser on the seal plate. Tighten screws to 10-14 inch-lbs. (11.2-16.1 kg/cm) torque.
9. Assemble the motor and seal plate to the volute. Be sure the clamp is properly seated
Note: Clamp knob can be located in any position around volute; if it is moved after assembly,
tighten knob while tapping around clamp to assist sealing. Do not move clamp while pump is
full of water.
10. Reconnect the RS-485 communication cable to the pump.
11. Fill the pump with water.
12. Reinstall the pump lid and plastic clamp. See “Pump Strainer Basket” on page 26 for details.
13. Prime the pump. See “Priming the pump for the fi rst time or after service,” on page 20 for
more information.
32
IntelliPro
®
Variable Speed Pump Installation and User’s Guide
Figure 1
