Instruction book
50 6996 0224 30
* : Just oil filtration in case of PFPE oil.
**: 4000 running hours or 1 year or whatever comes first.
Important note:
We recommend to monitor the oil condition through the sight glass and to change
the oil when it becomes discolored or milky. Not changing oil in time can lead to
premature blocking of the air exhaust filter and even failure of the vacuum pump.
Also check for condensed water vapour on the bottom of the oil tank through the oil
viewer (high water handling capability versions only). If there is condensed water
vapour, open the oil discharge valve slightly, let the condensed water vapour flow
out and close it again as soon as oil starts to come out. Check the oil level and top
up if necessary.
5.2 Oil specifications
It is strongly recommended to use only the genuine recommended lubricants. They are the result of years
of field experience and research. See section Preventive maintenance schedule for the advised
replacement intervals and consult your spare parts list for part number information.
Avoid mixing lubricants of different brands or types as they may not be compatible
and the oil mix will have inferior properties.
Always drain the pump as good as possible. Used oil left in the pump shortens the
lifetime of the new oil.
GVS A pumps are delivered with either synthetic or PFPE vacuum pump oil.
Recommended viscosity:
GVS 16 – 25A : ISO VG 32
GVS 40 – 630A :
Mineral oil : ISO VG 68
Synthetic / PFPE oil : ISO VG 100
5.3 Storage after installation
Procedure
In order to keep rubber parts and lip seals efficient and properly working, we recommend to operate the
pump for at least 30 minutes every 6 months with the intake closed.
Store the pump in its packing in a covered, dry place at a temperature between -20°C (-4 °F) and 50°C
(122 °F).
If the vacuum pump is going to be stored without running from time to time, protective measures must be
taken. Consult Atlas Copco.
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