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< Pump oil change procedure >
(1) Open the pump inlet port to the room air and operate the pump for five seconds.
This will effectively exhaust any oil remaining in the pump.
(2) Remove the standard exhaust port, then remove the drain plug, and empty the oil
from the pump.
(3) Attach the drain plug, and add the specified amount of the specified pump oil through
the oil opening. (Refer to Fig. 10.)
Ensure that the oil surface level is always within the range on the oil level gauge
while operating the pump. If there is insufficient oil in the pump, the pump
performance will be decreased and it may also lead to malfunctions.
If the oil amount decreases to where it cannot be seen on the oil level gauge, the
ultimate pressure will increase and the exhaust noise may not stop.
If the oil amount is more than the maximum oil level, oil drops may be sprayed out of
the exhaust when operating at high pressures.
(4) When the pump oil is badly contaminated, add new pump oil and operate the pump
for a few minutes to clean the pump. If the contamination is very bad, repeat this
procedure a few times.
(5) After changing the pump oil, operate the pump until it warms up, and check the
ultimate pressure.
(6) If the contamination is very bad and oil sludge accumulates at the bottom of the
pump, the ultimate pressure may not be achievable even after changing the pump oil.
In this case, it is necessary to disassemble and repair the pump.
Fig. 10 Adding oil to the sealed rotary vacuum pump
