Diaphragm pump N87TTE Ex
Servicing
Translation of Original Operating- and Installation Instructions, english, KNF N87TTE Ex 01/13
20
Removing pump head
1. Mark the top plate, head plate, intermediate plate and housing
with a felt-tip pen (
1
) to ensure proper assembly.
2. Remove
fan
cover:
Unscrew the four mounting screws (
2
) and remove the fan
cover (
3
).
The fan is visible.
3. Unscrew the four screws (Fig. 5/
1
) and remove the top plate
(Fig. 5/
4
).
4. Remove the screw covers (Fig. 5/
2
), unscrew the two screws
(Fig. 5/
3
) and take off the head plate (Fig. 5/
5
) and intermedi-
ate plate (Fig. 5/
6
).
The structured diaphragm is visible.
Replacing structured diaphragm
1. Put the pump on its side. This prevents diaphragm spacer(s)
(
10
) and disk spring (
11
) from falling into the pump housing
while the structured diaphragm is removed.
2. Move the structured diaphragm (
7
) to the upper point by
turning the fan.
3. Lift the structured diaphragm (
7
) by the opposing side edges,
grasp it and unscrew it in the counter-clockwise direction.
4. Remove the diaphragm support (
9
), diaphragm spacer(s) (
10
)
and disk spring (
11
) from the threaded pin (
8
) of the struc-
tured diaphragm and keep in a safe place.
5. Check all parts for soiling and clean if necessary.
6. Push the diaphragm support (
9
), diaphragm spacer(s) (
10
)
and disk spring (
11
) in this order onto the threaded pin (
8
) of
the new structured diaphragm (
7
) (see Fig. 6).
7. Move the connecting rod (connecting piece between drive
shaft and structured diaphragm, see Fig. 2/
6
, Page 12) to the
upper point by turning the fan.
8. Screw the structured diaphragm with the diaphragm support,
diaphragm spacer(s) and disk spring clockwise onto the con-
necting rod and tighten hand-tight.
WARNING
Hazard of explosions caused by damage
There is no explosion prevention and protection if
fan cover is damaged.
Î
Perform the step carefully and without applying
force.
Fig. 4: Marking with felt-tip pen
Fig. 5: Replacing structured
diaphragm
The disk edge of the disk spring (
11
) must be facing the struc-
tured diaphragm (
7
).
Fig. 6: Aligning disk spring
