IMPORTANT: Opening the flowmeter will void the
Flowmeter Calibration value assigned to your unit.
However, you may need to take the flowmeter apart for
periodic cleaning or to remove an obstruction.
If you can shake the flowmeter from end-to-end to produce
a “rattling” sound (shaft-end play), and if you can blow
into the meter from either end and cause the turbine to
spin freely, your flowmeter does not need cleaning. If
you cannot hear the “rattling” sound or get the turbine
to spin freely, your flowmeter needs to be cleaned. See
Illustrations 26 & 27 for reassembly instructions.
OPENING FLOWMETER
Cut the calibration tag retaining wire. Remove the screws
and disassemble the flowmeter. Do not attempt to remove
the sleeve bearings from the flowmeter housing.
Use warm water and if necessary, a mild detergent and a
soft bristle brush to clean all parts. Do not use solvents or
diesel fuel to clean the flowmeter. A magnet works well for
removing fine metallic particles from the turbine.
Inspect all parts. Check for excessive bearing or shaft wear.
The shaft will wear shorter until the turbine drags on
the housing. Illustration 25 shows you what a new shaft
looks like. When the shaft is worn to the point of drag, the
turbine must be replaced.
NOTE: The turbines have magnets built into the fins. There
are no visible magnets.
On a flat surface, place each housing half on end. Set and
spin the turbine in each half. It should spin freely. If it does
not spin freely, remove the turbine, wipe the shaft and try
again. If is still does not spin freely, the shaft or bearings may
have excessive wear. (Service may be necessary).
TO ASSEMBLE THE FLOWMETER
Place turbine in non-sensor housing. Coat O-ring with silicon
grease and position O-ring on housing. (O-ring may be
reused a few times, but will eventually need to be replaced).
Carefully set turbine in place. Set other housing half in place.
Drop all screws into holes. Hold nuts in place and finger-
tighten screws. Making sure O-ring is still properly aligned,
evenly tighten all screws. Attach tag.
After assembly, shaking flowmeter end-to-end should
produce a “rattling” sound (shaft end play). Blowing into
the meter from either end should cause the turbine to spin
freely. If the turbine only spins from one direction, install the
flowmeter so that the liquid flows in that direction (service
may be required).
For maximum accuracy the flowmeter should be mounted in
a vertical position. Accuracy of flowmeter readings cannot
be guaranteed for flow rates below two gallons per minute.
Recalibration is required before field operation.
Illustration 27
Complete assembly
FM750 SS Flowmeter
33
Troubleshooting (cont)
Flowmeter Cleaning and Assembly
Housing FM750 GFN
Turbine
P/N 14836
Quad-ring
P/N 13783
Housing FM750 GFN
(Non Sensor)
Illustration 26
Complete assembly
FM750 GFN Flowmeter
Housing FM750 SS
Turbine
Gasket
Housing FM750 SS
(Non Sensor)
Illustration 25
New Shaft
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