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APPENDIX 4
FLOW METER MAINTENANCE AND ADJUSTMENT PROCEDURE
1) Remove Flow Meter from Sprayer and flush with clean water to remove any
chemicals.
2) Remove flange bolts or clamp from the Flow Meter.
3) Remove the turbine hub and turbine from inside Flow Meter.
4) Clean turbine and turbine hub of metal filings and any other foreign material,
such as wettable powders. Confirm that the turbine blades are not worn. Hold
turbine and turbine hub in your hand and spin turbine. It should spin freely with
very little drag.
5) If transducer (XDCR) assembly is replaced or if turbine stud is adjusted or
replaced, verify the turbine fit before reassembling. Hold turbine hub with
turbine on transducer. Spin turbine by blowing on it. Tighten turbine stub until
turbine stalls. Loosen turbine stud 1/3 turn. The turbine should spin freely.
6) Re-assemble Flow Meter.
7) Using a low pressure (5 psi) [34.5 kPa] jet of air, verify the turbine spins
freely. If there is drag, loosen hex stud on the bottom of turbine hub 1/16 turn
until the turbine spins freely.
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