Appendix #5 - Brass End-Seal Adjustment - Precision PMR Rotary Feeder Service Maintenance Manual

Appendix #5 – Brass End-Seal Adjustment
Each end bell has six (6) 3/8" square-head set screws with lock nuts – see page 24. These set
screws are in the upper half of the end bell. Number the set screws 1 through 6 (moving in a
clockwise direction.) Set screws 1, 3, 4 and 6 are Pusher Bolts (threaded holes) while set screws
2 and 5 are Puller Bolts (through holes) – see page 24.
Precision has manufactured a limited number of rotary feeders with only five (5) set screws. If
you have one of these rotary feeders, please contact Precision for information on Brass End-Seal
Adjustment.
The brass end-seal to rotor gap is set at the factory prior to shipment and, under normal
conditions, adjustments are not necessary prior to start-up. Should adjustments be required (as
a result of misalignment from shipping/installation or as part of a periodic maintenance
program), follow the procedure below:
Loosen the lock nuts several turns on all six adjusting bolts
With a small hammer, lightly tap the heads of bolts 2 and 5 until you feel the brass seat
against the rotor end.
Finger tighten adjusting bolts 1, 3, 4 and 6 until you feel them snug against the brass seal.
With a wrench put very light pressure of these four (4) bolts against the rotor end. DO NOT
TIGHTEN! At this point the rotor will not turn.
Next, tighten up the lock nuts on bolts 2 and 5. Give these nuts approximately ¼ turn after
they are snug. This will put pressure on the brass seal pulling it away from the rotor. The
rotor still may not turn at this point.
Gently loosen adjusting bolts 1, 3, 4 and 6, evenly, until the rotor turns with minimal
resistance. This should give a brass clearance of approximately .010" to .020". There is no
way to verify this clearance from outside the feeder. It is important that all four (4) of these
bolts are loosened evenly.
When proper clearance has been achieved and the rotor turns with minimal resistance,
tighten all locknuts firmly. DO NOT OVER-TIGHTEN as this can bind the unit or pull the
threads from the brass.
Repeat procedure on the opposite end of the feeder.
A video illustrating this procedure can be found on Precision's website. Click on Service, then
Service Videos, and then PMR Rotary Feeder: Setting Brass Seals
Updated June 2018
Page 24