AW Gear Meters GEAR METERS - Manual (Page 10)

Positive Displacement Flow Meters
Operation and Installation Manual
9
Breakdown
Full breakdown instructions are included in the Maintenance Guide.
If you remove a flow meter from the line during maintenance, do not allow fluids to dry inside. Clean the
internals immediately, lubricate them, and cap the fluid ports.
Clean the carbide surfaces at the point where the gear rotates on the shaft. Buildup here may occur as a
thin smear and may be difficult to see, but causes friction and accelerate additional buildup later when
the gears are reinstalled. Spin the gears by hand to verify that they rotate freely on the shaft and apply a
suitable lubrication fluid before closing the flow meter. After tightening the bolts, a short squirt of shop
air will briefly spin the gears, which should be easily audible.
Do not overspin gears if using shop air to verify free rotation of gears prior to installation
Do not use wrenches or a Channellock to aid in re-installing the pickup sensor by hand. Whether you are
installing the sensor with a tool or by hand, tighten to hand-tighten torque only.
Plugging
In the event of plugging, the flow meter passes a reduced volume of fluid with an increased
backpressure and no frequency output. Careful installation is important because this is the time when
contaminants such as tape or metal shavings can enter the flow meter. Filters should be in line to
prevent oversized particles from entering the flow meter.
In the event the flow meter needs to be returned to the factory for further evaluation, flush the flow
meter in place and cap the ports. Pack carefully (with original packing materials, if possible) prior to
shipping to prevent damage.
Filtration
Filtration is recommended to prevent contaminants from entering the flow meter. If the flow meter is
plugged, a reduced flow can still be observed from the nozzle or outlet, as fluid pressure squeezes fluid
through the flow meter. Should this occur, review the cleaning and maintenance procedures in the
following sections.
Notice
Caution
Caution