Gast 5565 Series Lubricated Vacuum Pumps and Compressors - Manual (Page 11)

GAST LUBRICATOR ASSEMBLIES
Motorized Assembly AD190 Series
Heavy-duty AD190 oiler uses a large AD185 1-liter
reservoir and an electrically driven metering pump
that dispenses oil to two tubes leading to bearings.
Different discs are available for unit to dispense 1, 2,
3, or 4 drops per minute. Different units are used for
vacuum and pressure. To change a vacuum lubricator
into a pressure type, change springs loading metering
disc against housing. On pressure applications, tubes
carrying oil to bearings will be pressurized by air
inside unit to about half operating pressure. If
pressure is excessive, there will be oil leakage.
The following information on oil reservoirs and
lubricators has been written to give an understanding of
various assemblies used on Gast pumps and
compressors.
Oil Reservoir AA960 Series
AA960 oil reservoir type has a wick that regulates oil
flow and a bleed hole that equalizes pressure between
bearing cavity and air on top of oil in reservoir. V40C,
below reservoir, is a valve that is vacuum actuated (it
opens at about 850 mbar) and stops oil flow when unit
is turned off. It does not regulate oil flow in any way.
*Reservoir must be sealed tightly at top filler hole so
that atmospheric air does not leak in and increase oil
flow. Wick in reservoir regulates oil flow. A single wick
gives highest flow rate and a double or triple wick,
progressively less. If there are no leaks in lubrication
system, oil flows by gravity to unit bearings and into
pumping chamber to lubricate vanes as well.
Pressure Lubricator Assembly AA95A/AD730
A380C pressure oiler using an AA960 type reservoir,
acts as a valve to stop oil flow when unit is off. Inside a
spring-loaded poppet opens due to airflow and pulls a
tapered pin from oil hole and allows lubrication to start.
When unit is turned off, tapered pin pops back into
place and oil flow stops. AA95A and AD730 function the
same way.
Lighter duty pumps use wicks to regulate oil flow, while
heavy-duty oilers are available for those applications
where large units are operating continuously under
harsh conditions.
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