f
5
h
2
g
2
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Y
L
t
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f
2
s
2
D
2
Maintenance and Servicing
When maintaining these units and having such situations where personnel could
be hurt 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 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.
Filter on the suction side (VFS 220.80
➝
(A
2
)): Cylinder mesh (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 filters if contaminated completely.
Cylinder mesh (f
2
) can be dismantled by removing screws (s
2
) on the angle connection (D
2
)
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and
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).
Filter for Gas ballast: All pumps are equipped with a gas ballast valve (U).
The built in filter cartridge
(f
5
)
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 filter elements can be removed for cleaning. Re-assemble in reverse order
(picture
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).
2. Lubrication
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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 shortened if the application is dusty.
Only oils corresponding to DIN 51506 group VC/VCL or a synthetic oil (obtainable from
Rietschle) should be used. The viscosity must correspond to ISO-VG 100 according to
DIN 51519.
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 recommended synthetic oil.
Old and used oil must be disposed of corresponding with the relevant health,
safety and environmental laws.
If the oil brand is changed, the old oil must be drained completely from the oil separator
housing and the oil cooler.
3. Oil separation
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)
Extremely blocked filter elements will result in an 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 that the the filter elements (L) be changed every 2000 operating hours. It is not possible to clean these elements.
To change filters: Remove exhaust box (Y). Remove plastic fixings (t) and exchange the elements (L). If possible re-use the o-ring for re-assembly.
Re-assembly in reverse order.
4. Coupling
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)
The coupling rubbers (k) are wearing parts and should be checked
regularly. When the coupling rubbers are worn this can be detected by a
knocking sound when the vacuum pump is started.
Defective coupling rubbers can cause extensive damage and even in
some extreme cases break the rotor shaft.
To check the coupling stop the motor (m) and isolate. Remove the
screws (s
5
) on the intermediate flange (n). Pull off the motor together with
the motor side coupling half (q). If the coupling rubbers (k) are damaged
remove the circlips (l) from the coupling bolt (r) and exchange the coupling
rubbers (k). Leave the spacer (p) in place, check the coupling bolts (r) for
any wear and replace if necessary. To replace, remove the fan cover (h)
from the motor, pull off fan (v) from the motor shaft (m
1
) and remove
coupling (q) with the motor shaft out of the motor, remove the nut (w) with
washer (u) and exchange the coupling bolts.
Re-assemble in reverse order.
Prematic AG, Märwilerstrasse 43, 9556 Affeltrangen www.prematic.ch
Tel. 071 918 60 60, Mail: [email protected]
