Gardner Denver Elmo Rietschle Vacfox VC 50 Instructions De Service page 7

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.
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 (picture
Mesh filter (f ) must be cleaned regularly de-
2
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
the suction flange (D) can be dismantled by
removing screws (s ).
2
After re-assembly, check the function of the
valve by means of a brad or similar from above
through the mesh.
Filter for Gas ballast (picture
All pumps are equipped with a gas ballast
valve (U).
The built in disc (f ) and mesh discs (f
3
cleaned regularly depending upon the amount of
contamination by blowing out with compressed
air. By removing the screw (g ) 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 )
The oil level must be checked at least once daily, if necessary put oil into the pump at 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 reduced if the application is dusty.
The oil change should be done always at normal operating temperature and atmospherically
aerated pumps. With uncomplete draining, re-filling quantity reduces itself.
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 recommended 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 ,
Extremely blocked filter elements will result in
increased pump temperature and will cause
discolouration of the lubricant.
The oil separator elements (VC 50 / 75 ➝ 3x, VC 100 /
150 ➝ 4x) 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
Put in new oil separator elements with open lock symbol
) at arrow ▼ on insert and fix by turning to the
(see picture
right (up to clicking into place).
Oiling the O-Rings of the oil separator elements makes the
screw in easier.
):
) and
1
and ):
) must be
4
)
1
, and )
3
/ ") turning to the left.
4
f
2
s
G
1
open
U
s
D
2
h f
1 3
f f
4 4
L
closed
g
1