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6.1 Oil Level Control
The oil consumption varies according to the vacuum pump’s operating conditions. In order to keep the
vacuum pump at all times in an optimum operating condition, the oil level must be inspected at the oil
sight glass. The oil level must at all times be showing between the upper and lower markings on the
oil sight glass. The oil must be topped up if the oil level falls to the lower mark. We recommend to operate
pump with oil filling at upper marking FULL. This minimize the service needs and allows better dilution
of contaminants.
When additional oil is required, use only Directorr™ Premium vacuum oil, pump performance is not
guaranteed with other brands of oil.
Comparing the colour of a sample of the pump oil with fresh oil provides an indication of the contamination
of the pump oil. You obtain the oil needed for testing from the oil drain aperture with the vacuum pump
switched off and at operating temperature.
Brown or black oil or oil smelling as if it has burnt must be removed from the vacuum pump.
Flush the vacuum pump and fill up with fresh oil.
CAUTION !
Check the oil level regularly!
6
MAINTENANCE AND SERVICING
1
2
5
4
3
1
Oil fill plug
2
Oil drain plug
3
Lower marking MIN
4
Oil sight glass
5
Upper marking FULL
Fig. 11 Oil level control
6.2 Oil Colour Check
WARNING !
The condition and quality of the pump oil have a substantial effect upon
the performance and operational readiness of the vacuum pump!
