Pulsafeeder Polyfeeder EN - Manual (Page 40)

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7.1 Neat Polymer Feed Pump
Refer to the attached manual for the neat polymer feed pump supplied with your PolyFeeder system.
Follow the operation and maintenance guidelines within.
Pump Technology Flow Rate Range Manufacturer Model(s) Available
Solenoid Diaphragm 0.5 – 10 GPH Pulsafeeder (Pulsatron) LVB, LVF, LVG, LVH
Gear Pulsafeeder (Eco) GMC1, GC2, GC4
Progressing Cavity Seepex 5-24 MD, 15-24 MD, 3-12 MD
6-12 MD, 12-12 MD
7.2 Mix Chamber Motor Shaft Seal
Check the slot area between the mix chamber motor and the mix chamber. If there is evidence of
excessive product leakage in this area, the seal should be replaced.
If the mix chamber motor shaft seal needs replacement, follow these steps:
1. Shut off the polymer pump and mix chamber motor at the main control panel and lock out the power.
2. Close the dilution water inlet valve.
3. Drain the mix chamber by opening the Mix chamber drain valve.
4. Unbolt the motor side chamber mounting bracket from the skid frame (2 bolts).
5. Unbolt the motor from the rear of the mix chamber by removing the 8 hex nuts from the mix chamber
tie rods.
6. If desired, the motor could be unwired at its conduit box and be taken to a bench, or tipped onto its fan
cover and worked on at the skid location without requiring electrical disconnection (provided power is
off/ locked out and some means of securing the motor from dropping off the skid is present).
7. The seal is held in place by the mixing impeller and a hex nut threaded on the end of the motor shaft.
8. Unbolt the mixing impeller from the motor shaft (there is a slot in the back of the motor shaft to hold it
from turning – alternately one can get an open end wrench onto the hex nut underneath the impeller
and hold it that way.
9. Unbolt the hex nut under the impeller
10. Remove the spring retainer and seal spring
NOTE: It is recommended to replace the ENTIRE seal (head and seat) as an assembly, rather than
merely a head or seat alone.
11. Remove the seal head
12. Remove the seal seat (TEFC Motor plate can be unbolted from motor to facilitate this, simply remove
the four (4) 3/8” socket head motor mounting screws)
13. Inspect motor shaft for damage, repair/ replace if necessary.
14. Carefully replace the seal seat and head with new ones. Take particular care when installing the new
seal head - and its elastomeric sleeve – over the threaded end and shoulder of the motor shaft.
15. Reassemble the mix chamber in reverse order from how it was disassembled – Please note that the
motor capacitor should be “up” and the slot between the mix chamber and the motor should be
“down” when finished.