15.5.7 - Diaphragm reload and achieving vacuum
Maintenance must only be carried out by specialised and authorised personnel, the operator must
use suitable tools.
1 Once the pump head had been reassembled, restore the vacuum
between them.
2 Restart the machine without pressure, with 100% stroke with the
pressure gauge/pressure switch removed.
3 At this point, the excess oil between the diaphragms and the air
bubbles will begin to leak out of the valve in pos.12. Leave the
machine running until the air bubbles and non-toxic oil stop coming
out (approx. 2/3 minutes).
4 Using a clean absorbent cloth, clean any excess oil from valve
threading in pos.12, then re-assemble the pressure gauge or the
pressure switch after putting some PTFE tape on the male element
threading in order to guarantee its airtight seal. If reassembling the
pressure switch, restore the electrical connections in terminal
board.
HYDRAULIC OIL (MOLYGUARD HYDRO SINT 32)
• ISO VG 32
• ISO-L-HV
• DIN 51524 part 3 HLVP
• Eaton Vickers I-286-S/ M-2950-S
• DENISON HF-0/ 1/ 2
• NSF registration no.: 142921
Oil must be replaced at least once a year, or when the oil in the oil reservoir and in the recirculation tank
is deteriorated or emulsified and, in any case, at each maintenance operation to the pump head.
The filling requirement for each pump model is shown in the table.
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