ProMinent Hydro/4 Operating Instructions Manual page 46

Repairs
Drain the hydraulic oil from the hydraulic
end
46
CAUTION!
A diaphragm rupture may remain unnoticed
Should the multi-layer diaphragm be treated incorrectly, dia‐
phragm rupture signalling may fail.
– Take the multi-layer diaphragm from the packaging
immediately before installing.
– No impurities must contact the multi-layer diaphragm.
– Do not "inspect" the insert disc.
For the double-head versions and add-on power ends, perform the fol‐
lowing work simultaneously on both dosing heads.
Position numbers - see chapter "Maintenance"
1. Turn the stroke adjustment dial (2) more than 100% to the stop.
2. Remove the vent screw (3).
3. Place an oil trough under the hydraulic end.
4. Unscrew the oil drainage stopper (4) out of 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 discharge lines.
2. Unscrew the suction and discharge 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. Release the diaphragm mounting plate (2) with diaphragm (1) from
the dosing head.