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L
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s
2
U
f
4
f
4
h
1
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f
3
g
1
D
s
1
G
f
2
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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.
Do not work on a pump that is at its normal operating temperature as there is a danger from hot parts or hot lubricant.
1. Air filtration
The capacity of the pump can become
reduced if the air inlet filters are not
maintained correctly.
Filters on the suction side (picture
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):
Mesh filter (f
2
) must be cleaned regularly de-
pending upon the amount of contamination.
Cleaning can be carried out by washing out or by
blowing out with compressed air. Replace filters
if contaminated completely.
Dismantle cover (G) by removing screws (s
1
)
and the suction flange (D) can be dismantled by
removing screws (s
2
).
Filter for Gas ballast (picture
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and
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):
All pumps are equipped with a gas ballast
valve (U).
The built in disc (f
3
) and mesh discs (f
4
) must be
cleaned regularly depending upon the amount of
contamination by blowing out with compressed
air. Dismantle cover (G) by removing screws (s
1
).
By removing the screw (g
1
) and plastic cap (h
1
)
the filter elements can be removed for cleaning.
Re-assemble in reverse order.
Filter Cartridge (Optional Extras):
The filter cartridge of the vacuum tight suction filter (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 filter cartridge if necessary. The cartridge can be removed
completely by undoing the relevant retaining clips.
2. Lubrication
(picture
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)
Check the oil level regularly depending upon the operating hours. 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.
Only oils corresponding to DIN 51 506 group VC/ VCL or a synthetic oil (obtainable from Rietschle) should
be used. The viscosity must correspond to ISO-VG 100 according to DIN 51 519.
The recommended 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
cooling or operating with increased speed etc., the oil change time can be extended by using the recom-
mended synthetic oil.
Old and used oil must be disposed of correspond-
ing with the relevant health, safety and environ-
mental laws.
If the oil brand is changed, the old oil must be drained
completely from oil separator housing and the oil cooler.
3. Oil separation
(picture
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,
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,
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and
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)
Extremely blocked filter elements will result in
increased pump temperature and will cause
discolouration of the lubricant.
The oil separator elements may become contaminated after
a long period of operation which can result in high pump
temperature and motor overload. We therefore recommend
changing the filter elements (L) every 2000 operating hours
or when the filter back pressure is in excess of 0.7 bar (see
back pressure gauge
➝
optional extra). It is not possible to
clean these elements.
To change filters: Remove filter elements (L) with a ring
spanner (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 fix by turning to the
right (up to clicking into place).
Oiling the O-Rings of the oil separator elements makes the
screw in easier.
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