6 Maintenance and Check
6.1 Regular check
You should check following points at least once per three days during operation. Check the machine
much more frequently during high overload operation (continuous operation 1kPa or more, repeated
exhaust atmospheric pressure-vacuum).
1. Whether the pump oil volume is between two level lines or not.
2. Whether the pump oil is discolored or not.
3. Whether there is no abnormal noise.
4. Whether there is anything strange in the motor current value.
5. Whether there is no oil leak from the pump.
6.2 Vacuum pump oil check
The pump oil will be gradually deteriorated not only by contamination with sucked gas, but also by
temperature rise during pump operation. If pump is operated using pump oil containing much
content, the ultimate pressure will rise, leading to poor function of the mechanical friction parts of
the pump. In the worst case, the pump will seize up and cannot be rotated. Check the oil for
contamination, viscosity and discoloring periodically.
CAUTION
The oil level gauge is for checking the pump oil level. Since the oil is not circulating between the
pump case and the oil level gauge, contamination or discoloring of the oil may not be observed
on the oil level gauge. Periodically drain approx. 50ml oil through the drain port and check the
oil for contamination and discoloring.
Visual inspection
The pump oil should be clean and transparent.
If the oil color gets reddish brown, dark brown and cloudy white, please replace the oil. The
replacement cycle depends on the application, keep the check records and change the oil regularly.
Pump oil level check
The pump oil should be between the two level lines on the oil level gauge when pump operating. If oil
level is under the MIN line, exhaust valve can't be sealed so that ultimate pressure can't obtain. If oil
level excesses the MAX line, a lot of oil will splash out from the outlet port when pump running at
atmospheric pressure.
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