F22.060.01, issued on
B.6.20.44-B- 31 -
TROUBLESHOOTING
Component group Nature of defect Defect symptoms Possible cause Countermeasure
Heavy leakage Defective fitting Replace defective fitting
Air pressure supply
Fluid pressure drops
Narrowing of diameter
Hose line pinched, dirty
fittings
Check lines,
Clean fittings
Air motor, control
Irregular operation,
Stroke frequency drops,
comes to standstill
Icing
Air too humid, stroke
frequency too high, ambient
temperature too low
Remove ice, change
operating conditions
Flat slide defective Wear Replace worn parts
Air escapes continually from
air exit aperture
Flat slide or slide plate faulty
Foreign bodies have entered,
Wear
Renew defective part,
check air filter
Pump not aerated Aerate pump
Hydraulic section
Pressure fluctuations
Suction not in order, operates
irregularly
O-Ring at suction connection
damaged
Incorrect operation Replace O-Ring
Suction valve
Pump does not stop during
upwards stroke
Valve seat – ball defective
Decant valve
Valve seat – ball defective
Stuffing below
Pump does not stop during
upwards stroke
Stuffing defective
Stuffing top
Stuffing defective
Step piston
Fluid escapes at the piston
rod
Scoring on the running
surface
Wear Replace worn parts
Suction
Pump is working irregularly
Suction screen (dirt trap) is
clogged
Fluid contaminated Clean suction screen
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