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g
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L
D
open
closed
Maintenance and Servicing
When maintaining these units and in situations where personnel could be injured by moving parts or by live electrical parts the
pump must be isolated by totally disconnecting the electrical supply. It is imperative that the unit cannot be re-started during the
maintenance operation.
Pumps that have reached operating temperature may have a surface temperature at position (Q) of over 70°C.
WARNING! Do Not Touch.
1. Air fi ltration
The capacity of the pump can become reduced if the air inlet
fi lters are not maintained correctly.
Filters on the suction side (picture
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):
Mesh fi lter (f
2
) must be cleaned regularly depending upon the amount of
contamination. Cleaning can be carried out by washing out or by blowing
out with compressed air. Replace fi lters if contaminated completely.
The suction fl ange (D) can be dismantled by removing screws (s
2
). Re-
assemble in reverse order.
Filter for Gas ballast (picture
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):
All pumps are equipped with a gas ballast valve (U).
The built in fi lter cartridge (f
2
) must be cleaned regularly depending
upon the amount of contamination by blowing out with compressed
air. By removing the screw (g
2
) and plastic cap (h
2
) the fi lter elements
can be removed for cleaning.
Check also the valve seating for impurities.
Re-assemble in reverse order.
Filter Cartridge (Optional Extras):
The fi lter cartridge of the vacuum tight suction fi lter (ZVF) or dust
separator (ZFP) must be cleaned regularly again depending upon the
amount of contamination. Cleaning can be achieved by washing or
by blowing out with compressed air. Replace the fi lter cartridge if necessary. The cartridge can be removed
completely by undoing the relevant retaining clips.
2. Lubrication
(picture
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)
The oil level must be checked at least once daily, if necessary put oil into the pump to the top level of the oil
sight glass (l). First oil change after 500 operating hours (see oil drain plug (K)). Further changes every 500 -
2000 operating hours. The oil change times should be reduced if the application is dusty.
The oil change should be made with the pump at normal operating temperature and disconnected
from the suction pipework. If the pump is not completely drained, the amount of oil required to
refi ll is reduced.
Only oils corresponding to DIN 51 506 group VC/VCL or a synthetic oil (obtainable from Elmo Rietschle) should
be used. The viscosity must correspond to ISO-VG 100 according to DIN 51519.
The recommended Elmo Rietschle Oil types are:
MULTI-LUBE 100 (mineral oil); SUPER-LUBE 100 (synthetic
oil) (see oil type plate (M)).
When the oil is under a high thermal load, e.g. ambient or suction temperatures over 30°C, unfavourable cool-
ing or operating with increased speed etc., the oil change time can be extended by using the recommended
synthetic oil.
Old and used oil must be disposed of corresponding with the relevant health, safety and envi-
ronmental laws.
If the oil brand is changed, the old oil must be drained com-
pletely from oil separator housing and the oil cooler.
3. Oil separation
(picture
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,
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and
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)
Extremely blocked fi lter elements will result in
increased pump temperature and will cause dis-
colouration of the lubricant.
The oil separator elements (5x) may become contaminated
after a long period of operation which can result in high pump
temperature and motor overload. We therefore recommend
changing the fi lter elements (L) every 2000 operating hours
or when the fi lter back pressure is in excess of 0.7 bar (see
back pressure gauge
➝
optional extra, checkup at short-
term, atmospheric suction). It is not possible to clean these
elements.
To change fi lters: Remove fi lter elements (L) with a ring span-
ner (spanner size 19 mm or
3
/
4
“) turning to the left.
Put in new oil separator elements with open lock symbol (see
picture
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) at arrow
▼
on insert and fi x by turning to the right
(up to clicking into place).
Oiling the O-Rings of the oil separator elements makes the
screw in easier.
