130001815_002_C0 SV 40 B – 65 B – 100 B – 120 B ATEX Cat 2 11/2016 44 / 74
5.4 Maintenance Work
5.4.A Checking the oil level
top edge of the oil-level glass. When necessary, switch off the pump and add
the correct quantity of oil.
Overfilling leads to oil losses at high intake pressures
High oil consumption often indicates that exhaust filters are clogged (See
5.4.D).
The oil level should be checked at least once a day. Stop the pump for filling
that the oil must be checked.
The oil must be changed if:
- Its viscosity increases by 20 % compared to new oil.
- Its Total Acid Index exceeds given limits, depending of oil type. Please
consult us.
If gases or liquids dissolved in the oil result in deterioration of the ultimate
pressure, the oil can be degassed by letting the pump running for about 30
min. with the intake port closed and the gas ballast valve open.
The amount of oil required for an oil check should be drained via the oil-drain
plug into a beaker or similar container with the pump switched off but still at
operating temperature.
Bad oil quality can cause a pump temperature increase, which can influence
the pump ATEX temperature rating !
Depending on the process involved, dangerous substances may escape from
the pump and oil. Take the appropriate precautions.
Observe the safety regulations.