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8
7.0 MAINTENANCE
DISCONNECT BULLDOG FROM POWER SUPPLY BEFORE CARRYING OUT ANY
MAINTENANCE. THE OIL MUST BE CHANGED WHEN CONTAMINATED OR AT 20 HOUR
INTERVALS.
7.1 EVACUATION of most used systems results in some contamination of the oil, causing deposits
of sludge containing water and acids. These substances will corrode your pump. Changing the oil will
remove damaging substances and will enhance the life of the vacuum pump.
7.1.1 Poor vacuum reading or a grey or milky appearance usually indicates oil contamination. If the
vacuum pump is pumping condensable vapors, it may be necessary to change the oil after each
process so that the pump does not stand idle with contaminated oil.
7.1.2 To change oil REMOVE the Oil Drain plug and DRAIN OIL into a suitable receptacle, this
process is easier if the vacuum pump is tilted slightly.
7.1.3 Turn power switch ON momentarily with the inlet port open, thus removing any residual oil.
7.1.4 REPLACE the Oil Drain plug when the flow of oil has stopped.
7.1.5 REMOVE Oil Fill cap and FILL the oil reservoir with NEW JAVAC approved low viscosity oil up
to the center of the sight glass. The oil level will rise when the pump warms up and is operating under
vacuum conditions. The oil level should be checked later and adjusted as required.
7.1.6 REPLACE Oil Fill cap, then turn power switch ON and check for any oil leakage.
7.1.7 DISPOSE of waste oil in accordance with local regulations.
NOTE: OIL UNDERNEATH THE HOUSING COULD BE CAUSED BY CARELESS FILLING AND
SPILL OR FROM GAS BALLAST VALVE. THIS WILL NOT BE COVERED BY WARRANTY (SEE 8.0
TROUBLE SHOOTING UNDER OIL LEAKING).
7.2 SERVICING EXHAUST DEMISTER
7.2.1 The BULLDOG is equiped with dual oil demisters which will need replacing every 200 hours or
when blocked when excessive oil mist is visible.
7.2.2 Filter Elements must be replaced periodically or immediately if dirt or oil soaked.
7.2.3 The oil demister is accessible via the front removable plug. The rear demister is under the side
label cover.
7.3 MEASURING VACUUM
The performance of the BULLDOG vacuum pump can be checked, by measuring its ability to achieve
a good “ultimate vacuum”. To do this you need to connect a vacuum gauge to the pump’s inlet port.
Summary of Contents for BULLDOG A2L
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