Elmo Rietschle VC Serie Instructions De Service page 7

Maintenance and Servicing
When maintaining these units and having such situa-
tions 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.
Pumps that have reached operating temperature may
have a surface temperature at position (Q) of over 70°C.
WARNING! Do Not Touch.
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: The filter insert base (f
removed from the filter housing (e) by undoing the screws (s
the filter housing cover (d). Replacing the filter cartridges (b) on
the filter base can be achieved by removing the screws (s
the gasket (c) again for re-assembly (picture
Filter for Gas ballast: All pumps are equipped with a gas ballast
valve (U). The built in filter cartridge must be cleaned regularly
depending upon the amount of contamination. By removing the
screw (g) and plastic cap (h) the filter elements can be removed
for cleaning. The filter cartridge (f
with compressed air. Re-assemble in reverse order (picture
2. Lubrication (picture )
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 shortened if the application is dusty.
The oil change should be made with the pump at normal operating temperature and discon-
nected from the suction pipework. If the pump is not completely drained, the amount of oil
required to refill is reduced.
Drain the oil also from the oil cooler (see oil drain plug (K
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 corresponding with the relevant health, safety and
environmental 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 )
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 to change 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 (Y) ➝ optional extra, checkup at short-term, atmospheric suction). It is not possible to clean these elements.
To change filters: Remove maintenance cover (W).Exchange the elements (L). Before mounting the O-Ring of the new oil separator element should
be oiled liberally and the oil separator element screws tightened with a force of 15 Nm (spanner size 19 mm or
Re-assemble in reverse order.
) can be
2
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). Use
3
).
) can be cleaned by blowing out
3
).
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d
Y
L
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4
h
W