2.
C version
: Turn the dosing screw to the right up to the stop.
3. Turn the gas ballast knob to the right into position “0”.
– If the pump is running and warm, a knocking noise will soon be audible (oil hammer).
4. Open the silencer screw very slowly, until the knocking noise is minimal.
7.6 Changing operating fluid type
Changing the operating fluid type
The operating fluid type can be changed between mineral operating fluid – P3 –
and synthetic operating fluid – D1 – only. It is not possible to change from either of
these types to F4/F5 or vice versa.
● For 2 required flushing operations and the final filling, 3 times the filling quantity
of fresh operating fluid is required per pump.
When filling, refilling, or changing operating fluid, always use the operating fluid type specified on the
pump rating plate. Should process conditions change, you can convert to a different operating fluid.
Changing the operating fluid type
1. Carry out
two
flushing operations with the new operating fluid as described above.
2. Clean any accessories if necessary, such as ONF | OME or ORF | ODK, and replace the filter ele-
ments.
– Note any requirement for additional operating fluid.
3. Finally, fill the pump with a third operating fluid.
4. Note the currently used operating fluid type at a suitable location on the pump; e.g. on the rating
plate.
7.7 Checking the oil level in the oiler (C version pumps only)
Pumps in the corrosive gas version come equipped with an additional oiler. In these versions, the cham-
ber between the radial shaft seal rings on the rotor shaft are supplied with operating fluid by an oiler.
Checking the oiler fill level
max.
2
1
1
Fig. 27:
Oiler in C version pumps
1
Oiler
2
Sight glass
Maintenance
43/66
