Servicing
Laboratory vacuum pumps N 8__.3 FT.40.18
26
Translation of original Operating Instructions, English, KNF 121350-121429 11/18
1
Valve plate/sealing
2
Top plate
3
Cross recessed raised
cheese head screw
4
Disk spring
5
Housing
6
Diaphragm
7
Diaphragm spacer(s)
8
Connecting rod
9
Intermediate plate
10
Head plate
11
Cross recessed raised
countersunk head screw
Fig. 11: Cross section of pump heads for pump N 860.3 FT.40.18 (sym
bolic)
Removing pump head
1. On the pneumatic head connections, loosen one of the union
nuts by hand. Then slightly loosen the angle-fitting in the pump
head by turning it anticlockwise, so that the connecting tube
can be pulled out
2. Undo the screws that hold the fan cover (see fig. 3/
8
, page 12)
and remove the fan cover from the motor.
3. At both pump heads make a mark (M) on the top plate (fig.
11/
2
), head plate (
10
), intermediate plate (
9
), and housing (
5
)
with a felt-tip pen. This is to ensure that the parts will be reas-
sembled correctly at a later stage.
4. Undo the eight screws (
11
).
5. Lift the pump heads off the housing (
5
).
The magnetic valve of the drying system remains fitted in this
situation.
Changing diaphragm
Replace the diaphragms of two-headed pumps consecutively
in order to ensure that the same number of diaphragm spacers
is used as before.
1. Position the pump so that the diaphragm surface is upwards.
2. Turn the fan to bring one diaphragm (
6
) to top dead centre.
3. Using a small screwdriver, between the housing and the outer
edge of the diaphragm, carefully lift the edge of the diaphragm
lightly upwards at one point (making sure not to damage the
housing). Now grip the edge of the diaphragm on opposite
sides, unscrew it by turning anti-clockwise.
4. Take the diaphragm spacer(s) (
7
) off the connecting rod (
8
)
and retain them.
5. Check that all parts are free from dirt and clean them if neces-
sary.
Содержание N 820.3 FT.40.18
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