Vacuum pump system SCC 950
Servicing
Translation of original Operating Instructions, English, KNF 304771-304773 07/18
45
2. Remove from the intermediate plates
7
)
the valve
plates (
5
) and (
6
) and the O-rings (
15
) and (
16
).
3. Manually screw the new diaphragms (Fig. 24/
8
) into the
threads of the connecting rod and tighten to hand tightness.
Before you fully tighten the diaphragms, you are recom-
mended to move the diaphragm to the upper dead center.
4. Insert the new valve plates (Fig. 23/
5
) and (
6
)
and the new O-
rings (
15
) and (
16
) into the intermediate plates (7).
The upper and lower sides of the valve plates are identical.
Place the black O-rings (
15
) and (
16
) into the intermediate
plate of head 4 (see Fig. 22).
5. Place head plates (Fig. 23/
3
) onto the intermediate plates (
7
),
observing the pencil marks (Fig. 21/
M
).
6. With your hands, carefully and lightly tighten the head plate's
head screw (Fig. 23/
1
) on all four heads (torque: 60 Ncm).
Refer to Fig. 25 for arrangement and alignment of disk
springs and the washers.
9.3.6. Assembling heads and head connection
1. Place three O-rings (Fig. 22/
4
) into each of the head connec-
tion holes.
Place the three black O-rings (
4
) into the head connection
holes between heads 3 and 4.
2. Press together heads 1 and 2 (Fig. 21/
I
and
II
) and heads 3
and 4 (
III
and
IIII
).
3. Place heads 1 and 2 and heads 3 and 4 onto the compressor
housing; alternately tighten attachment screws
2
)
to
hand-tightness (torque: 3.5 Nm)
4. Insert O-rings (Fig. 20/
14
) and flat seals (
11
) in the grooves
and recesses in the head plates.
5. Reinstall the head connections:
To do this, manually tighten the head connections’ attachment
screws (Fig. 20/
9
and
12
).
Before assembling the head connections, make sure that the
two front attachment screws (Fig. 18/
9
) are inserted into the
foot plate. This is required in order to later re-fasten the pump
in the vacuum pump system.
6. Properly dispose of the old diaphragms, valve plates, and O-
rings.
Fig. 25: Aligning the
disk spring
The curvature of the disk spring
must face the pump head (see
Figure).
