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Maintenance
7.4 Replacing the diaphragm
Important note
Drain the hydraulic oil from the hydraulic
end
36
6.
Screw the vent valve (2) back in.
7.
Replace the vent screw (4).
8.
Check whether all openings are tightly sealed again – especially in
areas at risk from explosion!
WARNING!
Only in areas at risk from explosion: Check after 1
day whether the oil drainage stopper (5) and the
oil drainage plug (6) are still tight.
WARNING!
Observe the safety information at the beginning of the
chapter.
CAUTION!
A diaphragm rupture can remain unnoticed
The diaphragm rupture warning system can fail if the
multi-layer diaphragm is handled incorrectly.
–
Take the multi-layer diaphragm from the packaging
just before installing it.
–
Do not allow dirt to come into contact with the multi-
layer diaphragm.
–
Do not "inspect" the insert discs.
Perform the following work simultaneously on both dosing heads with the
double head versions and add-on power ends.
Position numbers - refer to the "Maintenance" chapter
1.
Turn the stroke adjustment dial (2) further than "100 %" as far as the
stop.
2.
Unscrew the vent screw (3).
3.
Place an oil trough under the hydraulic end.
4.
Unscrew the oil drainage stopper (4) from the hydraulic end.
5.
Allow the hydraulic oil to run out of the hydraulic end.
6.
Screw in the oil drainage stopper (4) with a new seal.
Replacing the diaphragm on the HP4
1.
Depressurise the suction and pressure lines.
2.
Unscrew the suction and pressure lines from the liquid end. Is the
hydraulic oil drained - see above?
3.
Remove the liquid end with the dosing head screws from the
hydraulic end.
4.
Loosen the diaphragm mounting plate (2) with the diaphragm (1)
from the dosing head.
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