Fault description Cause Remedy
Pump running, insufficient
suction
physical limit exceeded Correct installation
Cavitation check, cool down
Pump performance exceeded /
valve body/seat blocked
Correct installation or use
larger pump
Air pillow in suction/pressure line bleed
dry intake against
counterpressure
where necessary, only
convey in circuit, dampen,
bleed
Valve/filter in suction line closed open or clean
Valve/filter in pressure line closed open or clean
Container with conveyed medium
empty
fill/new container
Negative pressure in container ventilate
Wear on valve bodies replace
Suction line leaky seal
Suction line blocked clean
Air pillow on the pressure side Bleed pressure line
Valve body/ball blocked clean/replace
No suction from pump following
repair
Connections not correctly
secured
retighten, seal
Valve body incorrect inserted correct
Conveyed medium coming out
of muf
fler
Diaphragm broken Replace diaphragm, clean
pump
Diaphragm stretched System pressure Only generate pressure with
pump, check plant/valves,
replace diaphragms
excessive negative pressure
Check suction line, open
valve
Ice formation Improve air treatment
Leak between housing sections Tie rod loose tighten, check pump
O-ring on connection sleeve
damaged
replace
Diaphragm chemically corroded replace
Diaphragms heavily stretched replace
Tension on assembly/pipe
connection
release, correct tension, use
compensator
Muffler grey air humidity too high, ice
formation
Improve air quality, warm
inlet air if necessary
Troubleshooting
Troubleshooting for Lub-O-DryExx® Diaphragm compressed air pump
83 Rev. 02-09.2017
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