5
Technical Description
Scheduled Maintenance Cards
98/140 Dual Stage Rotary Vane Pumps User Manual/ 87-900-937-01(L)
Figure 17
NOTE
The oil has to be replaced:
1. when it has become particularly dirty due to the presence of contaminants in
the environments being evacuated;
2. when the degree of vacuum achieved by the pump is no longer satisfactory,
even after running for one hour with the gas ballast device open.
1. Place a tank for the waste oil under the oil drain plug (79).
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