User guide

page 53 of 61
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999248 / 28/04/2011
11.2 Replacing the diaphragm
➨ Useahexkeysize4toloosenthesixsocketheadscrews
at the pump head and remove the upper housing (housing
cover with housing cover insert).
☞ Neverremovepartsusingaspikyorsharp-edgedtool(e.
g. screw driver), we recommend to use a rubber mallet or
compressed air (to be blown carefully into port).
➨ Taketheheadcoverscarefullyoffthehousingtocheckthe
valves.
Note the position of the valves and remove them.
☞ Replace valves if damaged.
Use petroleum ether or industrial solvent to remove de-
posits. Do not inhale.
➨ Checkthediaphragmsfordamageandreplaceifneces-
sary.
➨ Position new diaphragm between diaphragm clamping
disc with square head screw and diaphragm support disc.
☞ Attention: Position diaphragm with pale side towards dia-
phragm clamping disc (to pump chamber).
➨ Lift diaphragm carefully.
➨ Apply pressure to the adjacent clamping disc to bring con-
necting rod into upper turning point position if necessary.
☞ Never use a spiky or sharp-edged tool to lift the dia-
phragm.
➨ Usethediaphragmkeytogripthediaphragmsupportdisc
below the diaphragm.
➨ Apply pressure to the diaphragm clamping disc to bring
the diaphragm into the lower turning point position. Press
diaphragmkeyagainstdiaphragmclampingdisc,unscrew
and remove diaphragm support disc with diaphragm.
☞ Iftheolddiaphragmisdifculttoseparatefromthesupport
disc, immerse assembly in naphtha or petroleum ether. Do
not inhale!
☞ Check forwashersunder clamping disc. Do not mixthe
washersfromthedifferentheads.Makesurethattheorigi-
nal number is reassembled at the individual pump head.