GEM 658 Operating Instructions Manual page 72

16 Inspection and maintenance
C
D
Place the compressor loosely on the actuator spindle, fit the
recesses D into the guides C. The compressor must be able to
be moved freely between the guides.
16.2.3.2 Mounting a concave diaphragm
Recess of compressor
Diaphragm boss
1. Move the actuator A to the closed position.
2. Place the compressor loosely on the actuator spindle, fit
the recesses D into the guides C (see "General informa-
tion" chapter).
3. Diaphragm size 10: Ensure that the anti-twist system is en-
gaged.
4. Check if the compressor fits closely in the guides.
5. Manually screw the new diaphragm into the compressor
tightly.
6. Check if the diaphragm boss fits closely in the recess of
the compressor.
7. If it is difficult to screw it in, check the thread, replace
damaged parts (only use genuine parts from GEMÜ).
8. When clear resistance is felt, turn back the diaphragm an-
ticlockwise until its bolt holes are in correct alignment
with the bolt holes of the actuator.
GEMÜ 658
D
C
Diaphragm pin
72 / 76
16.2.3.3 Mounting a convex diaphragm
1. Move the actuator A to the closed position.
2. Diaphragm sizes 25–50: Place the compressor loosely on
the actuator spindle, fit the recesses D into the guides C
(see "General information" chapter).
3. Check if the compressor fits closely in the guides.
4. Invert the new diaphragm face manually; use a clean, pad-
ded mat with bigger nominal sizes.
I.
II.
Diaphragm face
III.
5. Position the new backing diaphragm onto the compressor.
6. Position the diaphragm face onto the backing diaphragm.
7. Manually screw the diaphragm face into the compressor
tightly. The diaphragm boss must fit closely in the recess
of the compressor.
Adapter Compressor recess
Compressor
Backing diaphragm
Diaphragm face
Diaphragm boss
8. If it is difficult to screw it in, check the thread and replace
damaged parts.
9. When clear resistance is felt, turn back the diaphragm an-
ticlockwise until its bolt holes are in correct alignment
with the bolt holes of the actuator.
10. Press the diaphragm face tightly onto the backing dia-
phragm manually so that it returns to its original shape
and fits closely on the backing diaphragm.
Diaphragm pin
Diaphragm pin
www.gemu-group.com