Imovilli Pompe S.r.l.
Reggio Emilia – Italy
www.imovillipompe.it
Manuale d’officina – Pompe a membrana 10/11
ANNEX "A"
CHECKING AND REPLACING THE OIL
In diaphragm pumps, the oil contained in the crankcase performs two functions:
1. Lubrication of mechanical parts.
2. Diaohragm support during the pressure pumping phase.
Therefore the verification of the level and quality of it is to be considered of vital importance for the
functionality and duration of the pump and must be done at each start-up.
Level verification.
The oil level is visible from the cap and the control must be done with the pump stopped; if the oil
is lower than the minimum level imprinted on the tank or even not visible inside it, it will need to be
topped up using quality oil and the same gradation as the original (SAE 40) but not exceeding the
recommended maximum level.
Oil change
The replacement of the lubricant is advisable in the following cases:
a) Rupture of the diaphragms: the white-yellow coloring of the oil contained in the tank or the non-
visibility of the level inside the tank even after a small refilling indicates that the diaphragm (s) has
failed.
It will therefore be necessary to examine the pump and promptly repair it; in these cases the pump
must not be used and it is advisable to empty the pump completely from the liquid contained therein
by removing a head and the related cylinder; then insert diesel into the crankcase with the intention
of preserving the mechanical parts from oxidation. Then contact an authorized center.
b) Scheduled periodic maintenance: the periodic maintenance tables according to the type of use
DO NOT provide for the replacement of the lubricant as an end in itself; the replacement of the
lubricant is done in concomitance with the programmed replacement of the diaphragms.
Starting the pump after replacing diaphragms and / or lubricating oil
After an intervention to replace the diaphragms and / or lubricating oil or simply after inspecting the
crank mechanism of the pump, pay particular attention to the first start of the pump and you must
observe some rules listed below in order to allow the complete "purging" air contained within it and
in fact guarantee the pump to achieve maximum efficiency and functionality.
a) When the oil is full and the oil tank is open, tilt the pump according to its transverse axis and
slowly rotate the shaft by hand or using a crank. With this operation you will notice a substantial
leak of air bubbles from the pump casing and the oil level will drop.
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