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Cleaning and inspecting the pump heads
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.: 997832 / 03/02/2009
page 18 of 26
➨ Remove the union nuts of the hose connections at the
pump head using an open-ended wrench w/f 15.
➨ Use an open-ended wrench w/f 17 to loosen the fittings at
the pump head.
➨ Turn the hose connections of the fittings with an open-end-
ed wrench w/f 20 to detach the hoses.
☞ Pull off the one bent connecting hose at the outlet side
of the pump (only MD 12 / MV 10) directly at the pump
head.
➨ To check the valves and the diaphragms use a hex key to
remove four socket-head screws from the pump head and
remove housing cover with head cover, valves and O-rings
(only MD 8 / MD 12 / MV 10).
☞ In case, place the pump on edge (onto the distributor at
the inlet or at the outlet). Support pump appropriately.
Maintain only one side of the pump at a time.
☞ Never remove parts by 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).
➨ Remove head cover carefully from housing cover. Note
the position of the valves and remove them.
☞ Replace valves and/or O-rings if damaged.
☞ Check diaphragm for damage and replace if necessary.
☞ Use petroleum ether or industrial solvent to remove de-
posits. Do not inhale.
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