D39489-BA-PM-EN.pdf - 第36页
36 D39489 | Date 12/2019 Diaphragm pump PJ25481 - 950.50.1 8 Serv icing Translation of origina l Installat ion Instructions , english , KNF 125530 - 31 6634 06/18 25 Fig. 8 : Exploded dr awing of pump head s 1 and 2 R ep…
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D39489 | Date 12/2019
Servicing Diaphragm pump PJ25481-950.50.18
24 Translation of original Installation Instructions, english, KNF 125530-316634 06/18
8. Head 4 (Fig. 6/IIII):
Use a felt-tip pen to apply four marks (M) to the head plate, in-
termediate plate, and compressor housing.
During re-assembly, refer to the marks on the individual heads
to ensure th
at the parts are properly re-assembled.
9. Undo the 16 attachment screws (Fig. 4/3) on the heads (1 to 4)
and remove the heads (1 and 2 as well as 3 and 4).
10. Pull apart heads 1 (Fig. 7/I) and 2 (II) and heads 3 (III) and 4
(IIII) and remove O-rings (19).
Fig. 7: Removing the o-rings
11. On all four heads, undo the head screw (Fig. 8/2) in the head
plate (4) and remove head plate from the intermediate plate
(6).
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D39489 | Date 12/2019
Diaphragm pump PJ25481-950.50.18 Servicing
Translation of original Installation Instructions, english, KNF 125530-316634 06/18 25
Fig. 8: Exploded drawing of pump heads 1 and 2
Replacing the diaphragms and valve plates
1. Manually remove the four diaphragms (Fig. 9/7) by turning
them in the counterclockwise direction.
Use caution to prevent the diaphragm spacers (21) located be-
tween the diaphragm and the connecting rod from falling into
the pump housing. The diaphragm and the connecting rod from
falling into the housing. The diaphragm spacers (
21) must be
installed in the same quantity as before in order to ensure th
e
pump’s pneumatic performance.
Fig. 9: Replacing diaphragm
37
D39489 | Date 12/2019
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