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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. Lubrication (pictures
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Check the oil level regularly depending upon the operating hours. First oil change after 200 operating hours (see oil drain plug (K)). Further changes
every 2000 operating hours. The oil change times should be shortened if the application is dusty.
Only oils corresponding to DIN 51 506 group VB / VBL or a synthetic oil (obtainable from Rietschle) should be used. The viscosity must corre-
spond to ISO-VG 320 according to DIN 51 519.
The recommended Rietschle Oil types are: MULTI-LUBE 320 (mineral oil); SUPER-LUBE 320 (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 tank.
2. Air filtration (picture
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The capacity of the pump can be reduced if the air inlet filters are not maintained correctly.
The filter cartridges (f) must be cleaned regularly depending upon the amount of contamination. Cleaning can be carried out by blowing out with
compressed air. Replace filters if contaminated completely
The filter cartridges (f) can be removed from the filter housing by unscrewing the fixing knobs (g) and removing the filter housing cover (h) with
gasket. Cleaning or replacing the filter cartridges (f). 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.
3. Oil separation (picture
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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 may become contaminated after a long period of operation which can result in high pump temperature and motor overload.
We therefore recommend to change oil mist separator (e) every 2000 operating hours. It is not possible to clean these elements.
To change separator: Unscrew exhaust cover (T). Change oil mist separator (e).
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 and isolate. Remove the screws (s
5
) on the motor flange (n). Pull off the motor (m) 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 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.
