Troubleshooting axial piston pumps
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7.4
7.4
Troubleshooting axial piston pumps
The following table should be of help when performing troubleshooting This table is by no means complete.
In practice you may encounter problems that have not been listed here.
Procedure
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Always proceed systematically, even under time pressure. Indiscriminate, ill-considered disassembly and
changing of settings can lead to a situation in which the original cause of a fault can no longer be detected.
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Get an overview over the function of the product in connection with the overall system.
l
Try to clarify whether the product was able to deliver the required function within the overall system before the
fault occurred.
l
Develop a clear understanding of the troubleshooting process. If necessary ask the direct operator or machine
driver.
Try to detect changes to the overall system, the product is installed in:
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Have conditions or area of application of the product been changed?
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Were changes (e.g. changeovers) or repairs made to the overall system (machine/plant, electrics, control) or
to the product? If yes: What kind?
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Has the product or the machine been operated as intended?
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How does the fault occur?
Fault
Possible cause
Remedy
Unusual noises
Insufficient suction conditions, e.g.
air in the suction line, inadequate di-
ameter of the suction line, excessive
viscosity of the pressure fluid, ex-
treme suction height, too low suction
pressure, foreign bodies in the suc-
tion line.
Machine or system manufacturer
(e.g. optimize feed conditions, use
suitable pressure fluid).
Completely purge the axial piston
unit, fill the suction line with pres-
sure fluid.
Remove foreign bodies from inside
the suction line.
Inappropriate fastening of the axial
piston unit.
Check the fastening of the axial pis-
ton unit as specified by the machine
or plant manufacturer. Observe the
tightening torques.
Inappropriate fastening of attach-
ment parts, e.g. coupling and hy-
draulic lines.
Fasten attachment parts as speci-
fied by the coupling or fittings manu-
facturer.
Pressure relief valves of the axial
piston unit (charge pressure, high
pressure, pressure override).
Purge the axial piston unit, check
the viscosity of the pressure fluid,
consult the service department.
Mechanical damage to the axial pis-
ton unit.
Replace the axial piston unit, con-
sult the service department.
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