Heidolph ROTAVAC valve control Mode D'emploi page 67

Replace diaphragm
Lift diaphragm carefully.
As required, move piston rod to upper dead end by depressing the cocking disc.
Do not use sharp tools to lift diaphragm.
Introduce special tool underneath diaphragm.
Depress cocking disc until reaching lower dead center.
Force special tool against cocking disc and unscrew
cocking disc with diaphragm.
If old diaphragm wont detach from back-up disc, try to
us gasoline or petroleum.
Check for shims originally installed, use the same
number for reassembly.
Introduce new diaphragm between cocking disc and back-
up disc.
Caution: Light-colored side of diaphragm points
towards cocking disc.
Lift edge of diaphragm and carefully introduce cocking disc
and back-up ring in special tool.
Avoid damage of diagram: do not kink diaphragm until
showing light-colored lines on the surface.
Check for shims originally installed, do not remove, re-
install same number.
Insufficient number of shims: pump won't reach final
pressure; too many shims: pump running noisy.
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