The GMP is driven by a TEFC 90 V D.C., variable speed
electric motor. The motor is fuse-protected; which is
located inside the controller. The internal gear reducer is
pre-lubed and sealed.
Two zerks for lubrication of the pump are provided. The
zerk closest to the pump shaft is provided for filling the
seal chamber. The zerk closest to the pump’s side
outlet is provided for lubrication of the metering gear
itself. Both should be filled daily with a lubricant
compatible with the material being dispensed. NOTE:
The second zerk cannot be filled without opening the
bleed port at the bottom of the pump. While the zerk on
the top of the pump is filled, the bleed valve at the
bottom of the pump must be opened. Lubrication is
complete when fresh lubricant is pushed out from the
bleed valve.
**Use caution when disassembling the Gerotor pump,
making sure not to gouge or mar any of the internal
surfaces of the pump.**
#60065-02: Page #3
Each AST gear metering pump consists of a hardened
drive shaft, lube chamber with dual shaft seals, metering
gear, material inlet block with air bleed port and a material
outlet assembly with gauge
In operation the pump shaft is connected to an inner drive
gear which, when turned, drives an outer internal driven
gear. The inner gear has one less tooth than the outer
gear allowing the pump to transfer material from the inlet
to the outlet of the pump, which are on opposite sides of
the gears. Precise tolerances prevent material by-pass as
the gears maintain a positive seal as the contours of each
gear are followed. Excessive wear or physical damage to
the surfaces of the working section of the pump will
reduce the ratio accuracy of the system.
Ratios are simply a function of the number of teeth on
either drive sprocket. Example: a 32 and a 16-tooth
sprocket will dispense at a 2:1 ratio by volume. In some
cases, dual stage pumps can be used on one side to
obtain a wider ratio.
Gauges on the outlets of the pumps allow the operator to
monitor pumping pressures. Pressure readings on the
gauges will almost always be different from “A” to “B”; this
is due to the difference in viscosities of the “A” and “B”
materials. The operator should pay attention to the
behavior over time of the gauges. Large variations often
indicate problems with obstructions, empty tanks/inlets, or
other problems.
3. GEROTOR PUMPS & MATERIAL OUTLETS
2. ELECTRIC DRIVE MOTOR & GEAR REDUCER
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