Fault description Cause Remedy
Pump is running, but is
not conveying any or
only little fluid.
Negative
pressure/vapour
pressure in the
incorrect ratio
Ensure that the required negative pressure
required to suck in the fluid is not higher than the
vapour pressure of the fluid being conveyed
(cavitation).
Ball return valves
stuck
Check pump for stuck ball return valves. If the
product being conveyed is not compatible with the
pump elastomers, these can swell up. Replace
ball return valves and seals with parts made from
appropriate elastomers. The valve balls also
become smaller with increasing wear and can
therefore become stuck in the valve seats. In this
case, replace valve balls and valve seats.
Ice formation on the
compressed air valve of
the pump
Humidity in the
compressed air
Check if the compressed air contains too much
humidity
. Either fit a dryer or a hot air generator for
compressed air
. In some applications, a separator
can be used instead to remove the water from the
compressed air.
Air bubbles in the
pressure piece of the
pump
Diaphragm
broken
Check pump for broken diaphragm.
Leaking
diaphragm plate
Check external diaphragm plate for leaks (see
section 8C).
Leaking o-rings
and seals
Check clamping straps as well as o-rings and
seals for leaks, especially on the suction elbows.
Leaking line
connections
Ensure that the line connections are airtight.
Fluid escaping from the
bleed connection
Diaphragm
broken
Check pump for broken diaphragm.
Leaking
diaphragm plate
Check the pump for leaks between the outer
diaphragm plates and piston rod.
Troubleshooting
Troubleshooting for Lub-O-DryExx® Diaphragm compressed air pump
85 Rev. 02-09.2017
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