Servicing
Diaphragm pump PJ25481-950.50.18
26
Translation of original Installation Instructions, english, KNF 125530-316634 06/18
2. Remove from the intermediate plates (Fig. 8/
6
) the valve plates
(
16
) and (
17
) and the O-rings (
5
) and (
18
).
3. Manually screw the ne diaphragms (Fig. 9/7) into the connect-
ing rod’s threads and tighten to hand tightness.
Before you finally tighten the diaphragms, you are recom-
mended to move the diaphragm to the upper dead center.
4. Insert the new valve plates (Fig. 8/
16
) and (
17
) and the new O-
rings (
5
) and (
18
) into the intermediate plates (
6
).
The upper and lower sides of the valve plates are identical.
When inserting the O-rings, make sure that they are the correct
size and color (head 4: black O-rings).
Install intermediate plates and head cover
1. Place head plate (Fig. 8/
4
) onto the intermediate plates (
6
), ob-
serving the felt-tip pen marks (Fig. 6/
M
).
2. With your hands, carefully and lightly tighten the head plate’s
head screw (Fig. 8/
2
) on all four heads (tightening torque:
60 Ncm).
Refer to for arrangement and alignment of disk springs and the
screw’s washer.
When inserting the O-rings, make sure that they are the correct
size and color (head 4: black O-rings).
3. Place three O-rings (Fig. 7/
19
) into each of the head connec-
tion holes.
4. Press together heads 1 and 2 (Fig. 6/
I
and
II
) and heads 3 and
4 (
III
and
IIII
).
5. Place heads 1 and 2 and heads 3 and 4 onto the compressor
housing; alternately tighten attachment screws (Fig. 4/
3
) to
hand-tightness (tightening torque: 3.5 Nm).
6. Insert O-rings (Fig. 6/
12
) and flat seals (
13
) into the head con-
nection receiver.
7. Reinstall the head connections:
To do this, manually tighten the head connections’ attachment
screws (Fig. 5/
10
and
15
).
8. Reinstall the head connection cover (
8
):
To do this, manually tighten the head connection cover’s at-
tachment screws (
9
).
9. Reinstall the head covers (Fig. 4/
20
):
To do this, manually tighten the eight attachment screws (
1
).
10. Properly dispose of the old diaphragms, valve plates, and O-
rings.
Fig. 10: Aligning the
disk spring
