When the pump is operating in vacuum mode, lubricating oil is drawn into the sight feed valves by
the vacuum produced by the pump. Under vacuum, the line to the exhaust side of the pump acts as
a vent line. When operating in pressure mode, the line from the pumps exhaust port pressurizes the
oil tank, forcing oil into the sight feed valves to lubricate the pump. As this is actuated by system
pressure, once the sight feed system is set, it will tend to compensate and self-regulate for any
changes.
The rate of oil supply to the pump can be checked by observing the drops falling inside each
Dripper through the sight glass. This should only be finalized when the vacuum is up to full
operating level and the pump has fully warmed up (i.e. after approximately 30 minutes of running.)
The flow rate should be adjusted to no less than the recommended drop rate shown below:
To enhance protection against contamination damage it is recommended to have the oil flows
exceed the minimum rate.
The oil flow rate can be adjusted by turning the adjusting screw clockwise to reduce, counter-
clockwise to increase. Ensure the locking gland nuts are tight to avoid Dripper adjustment while the
pump is operational.
Flushing Information
Masport vacuum pumps require little regular maintenance except for flushing the pump weekly or
anytime liquid or solids have been allowed to enter the pump.
Masport vacuum pumps are best flushed by using a Masport Flushing Kit and specially formulated
Flushing Fluid. These are available from your local Masport representative or by contacting Masport.
Plastic Flushing Kit Steel Flushing Kit
1 Gallon Flushing Fluid Bottle 6 Gallon Case of Flushing Fluid Bottles
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