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t
L
L
1
Y
t
1
t
L
L
2
t
1
Q
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 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: Mesh Filter (f
1
) 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.
The mesh filter (f
1
) can be dismantled by removing screws (s
1
) on the filter
housing (D) (picture
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).
Filter for Gas ballast: 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. By
removing the screw (g
1
) and plastic cap (h
1
) the filter elements can be
removed for cleaning. Re-assemble in reverse order (picture
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).
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 shortened 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 corre-
spond 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 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.
3. Oil separation (pictures
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and
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)
Extremely blocked filter elements will result in an increased pump temperature and will cause discolouration of the lubricant.
The oil mist separator (VCA / VCE 15 / 25) or oil separator elements (VCA / VCE 40 - 100) may become contaminated after a long period of operation
which can result in high pump temperature and motor overload. We therefore recommend to change the oil mist separator (L
1
) or the oil separator
elements (L) every 2000 operating hours or when the filter back pressure is in excess of 0.7 bar (see back pressure gauge (Y)
➝
optional extra).
It is not possible to clean these elements.
VCA / VCE 15 / 25: Remove oil separator covers (t
1
). Exchange the oil mist separator (L
1
).
When refitting the oil mist separator (L
1
) check for correct orientation.
(the air entry opening must be positioned at the top half of the pump
→
see picture
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)
VCA / VCE 40 - 100: Remove oil separator covers (t
1
). Remove plastic fixings (t) and exchange the elements (L). If possible re-use the o-ring for
reassembly. Re-assemble in reverse order.
4. Coupling (picture
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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
). 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 (v
1
), remove the circlip (l
1
), pull off
the coupling and fan (v) complete from the pumpshaft, remove the nut (w) with washer (u) and exchange the coupling bolts.
Re-assemble in reverse order.
