Printed in U.S.A.
PUMP REPAIR
Important Inspection Tasks
A.Troubleshooting
A successful troubleshooting of hydraulic systems
requires a detailed knowledge about the hydraulic
system and understanding of the layout, operation,
and ensemble acting of the individual components. All
documentation required should be at hand.
Understanding usually requires the ability to read
hydraulic and electrical circuit plans.
Suited test devices include a temperature gauge,
pressure gauge, multimeter, stop watch, and rev.
counter.
B.Repair
Minor repairs should only be undertaken by qualified
personnel. Major repairs and overhauls should only be
undertaken by the manufacturer.
Cleanliness is mandatory when working on hydraulic
systems! This is especially true with systems with an
Axial Pumps. All surfaces where joints are to be
separated should be cleaned prior to disassembly. All
ports should be plugged to prevent contaminants to
enter an open system.
Defective devices should not be repaired on site
because the tools and cleanliness required for
professional repairs is not present. It is better to
replace only the complete unit or at least sub-
assemblies, which can be tested individually, on site.
This way standstill periods and fluid losses are
minimized as well as repairs are made more easily.
It is important to take into account whether the
malfunction of the repaired component may have
caused malfunction of other components, for example
by migrating debris or even fragments within the
hydraulic system.
After repair of the component, one should look for and
solve the basic cause for this malfunction, for example
unsuitable filtration level, elapsed preventive service
maintenance.
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