1 Using a wrench, hold the valve in
pos.8, fully loosen the pressure gauge
pos.9 Detail "A", or the pressure
switch present.
2 Remove the pump head washers and
screws.
3 Fully remove the pump head and the
front shield unit pos.2, separator ring
pos.5, making sure that the back shield
pos.6, centred to the oil reservoir does
not fall. NOTE: not all pump heads
have both shields separated.
4 Remove both diaphragms pos.3 - 4
from the separator ring pos.5. It may
happen that the diaphragms have
hardened and become compact
between them, if so, break one (using a pointed tool) to facilitate disassembly.
IMPORTANT: it is not always required to replace the diaphragms, unless one of them has broken. If
disassembling the pump head following operations in the oil reservoir or routine maintenance, it is good
practice to check its conditions.
If the diaphragms do not show holes, obvious air bubbles interposed between them, strong deformations
and streaks or abrasions, it is possible to avoid replacing them and to save the time to recharge them. In
this case, the diaphragm/separator ring unit must be handled with care, paying attention to avoid the loss
of the vacuum condition between the two elements. Otherwise it is required to proceed with recharging
anyway.
Having said that, and in order to spread out operations on the machine as much as possible, DOSEURO
S.r.l. always recommends preventive replacement once you reach this stage of intervention.
15.5.6 - Pump head reassembly operation
Before reassembling the head, the operator must make sure that the “OR” gaskets are not worn,
otherwise replace them, accurately clean the seats, check the conditions of the diaphragms in pos.3 - 4
and accurately clean the head, removing any process residues. Once the checks are satisfied, proceed
as follows:
The diaphragms must always be replaced in pairs using new components, even if there is only
one damaged element.
1 If present, install the rear shield pos. 6 complete with OR gaskets, onto the oil
reservoir; position the Ø 2-3 mm holes on the ends of the shield cap in a
vertical position in order to bleed any residual air.
2 Assemble both diaphragms pos.3 - 4 to the separator ring pos.5 by manually
pushing them into the ring groove, without ruining them.
3 Assemble the front shield pos.2 complete with OR gaskets on the pump
head, paying attention to the vertical position of the Ø 2-3 mm holes located
on the end of the shield cap.
4 At the same time, reassemble the diaphragm/separator ring unit pos.5 and the head/front shield
pos.2, paying attention to the position of the diaphragms (they can easily come out of the seat and
decentralise or fall). To facilitate this operation, it may be convenient to lightly grease the diaphragms
to promote adhesion to the ring.
5 Reassemble screws, nuts and washers, properly tightening the pack.
6 Fill the oil reservoir as described in the previous chapter for BR series head pumps.
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