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PAGE # 14
PF-50 Series Filter (ver. 4/5/05)
PUMP PRE-STRAINER (Optional)
The pump pre-strainer housing is flanged mounted to the pump suction The pre-strainer contains a
corrosion resistant stainless steel basket with 1/8 inch perforations. The pre-strainer basket must be kept
clean and free of debris. Always follow the shut down procedure before attempting any repairs, adjustments
or cleaning. To clean the pre-strainer basket loosen the four hex bolts that hold the cover in place. Gently
lift the cover off the strainer body (take care not to damage the gasket.) If the gasket does not come off in
one piece it will need to be replaced. Before replacing gasket clean all surfaces of old material. Remove
the basket from the housing utilizing the handle. After cleaning the basket reverse the above procedure
making sure that the gasket is in place and tighten the four hex bolts. Always follow the start-up procedures
after any shut-down.(See figure 3 page 18)
PUMP AND MOTOR (Optional)
The pump wet end is cast iron bronze fitted. The close coupled, back pull-out pump and motor assembly
is bolted together with hex bolts for ease of maintenance or repair. The pump utilizes a standard mechanical
seal pressed into the motor bracket, which is bolted directly to the pump volute. The pump shaft slides over
the motor shaft and is held in place with three set screws. The pump impeller is threaded or keyed on to
the end of the motor shaft and locked in place with a hex jam nut. (See figure 3)
The pump flows for the PF-50 series filters are listed in Table III, page 7 at 50 feet of head (TDH). This
correlates to approximately 22 psi discharge pressure at design flow.
CLEANING & ADJUSTING PUMP
Always follow the shut down procedure before attempting any repairs or adjustments. The impeller should
spin freely. If not, check for an obstruction or debris that may be lodged between the impeller and volute
or impeller and adapter bracket. If no debris can be found and the impeller remains obstructed remove
the bolts holding the volute to the motor bracket and the two bolts holding the motor to the base (see fig-
ure 3). Slide the motor and motor bracket away from the pump volute. Inspect the volute for foreign mate-
rial. Reverse the above procedures to reassemble (replace any gaskets which are not in good condition).
Rotate the pump shaft manually after assembly to check clearance. Always follow the start-up procedures
whenever the filter unit has been turned off.
WARNING:
Disconnect and lock out all electrical power to the filter prior to performing pump maintenance.
NOTE:
Always relieve internal vessel pressure before attempting any repairs or adjustments on the filter unit.
