5-2
1) Open the gas ballast valve slightly until you can hear the exhaust sound. If you open it fully,
purge pump oil will become dirty easily.
5-2-2. maintenance of purge pump
If the purge tank pressure does not reach available vacuum level, replace the purge pump oil.
Procedure of replacing the purge pump oil
a) Open the drain cock, and release all oil of the pump.
b) Close the drain cock, and remove the cap.
c) Fill fresh oil through the oil filling port.
Refueling, the oil level should be kept above the oil level
window of the red dot 5 ~ 6mm.
Stop the purge pump when you replace the oil.
The type of rotary pump oil differs depending on vapor pressure, viscosity, etc. The use of a wrong
type of oil can lower the pump performance. So use the attached pump oil.
If the ultimate pressure cannot be attained by oil change, sludge or other deposit may have
collected on the bottom of the pump case. In that event, overhaul is required. Contact our service
agent.
Gas ballast valve
Suction
Purge pump
Drain
Oil level gauge
Oil filling
Drain plug
Purge pump
on-off switch
Purge indication
lamp (green)
Purge tank
Purge unit
B valve
Purge pump
V3
V1
V2
Lower shell
Upper shell
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