Festo VTSA Series Description page 82

3. Installation
3−6
2. Ascertain the valve terminal which controls this actuator.
3. Remove the silencer, if fitted, from port (3/5).
4. Hold a piece of white cardboard 10 cm in front of the
exhaust port.
5. Let the system run for a short period.
There must be only a slight yellow colouring on the
cardboard. If oil droplets appear, this is an indication
that too much oil has been used.
Another indicator of over−lubrication is the coloration or the
condition of the exhaust air silencer. A distinctly yellow col
ouring of the filter element or drops of oil on the silencer indi
cate that the lubricator setting is too high.
Festo P.BE−VTSA−44−EN en 0905e