Issued June 2020
Maintenance
Copyright 2020, Heil Environmental
Printed in U.S.A.
159
PUMP MAINTENANCE
Important Inspection Tasks
Hydraulic Fluid
The service life of hydraulic fluids is highly dependent on
the operation temperature and the conditions. The
maximum operation temperature usually is 80°C, an
increase of 10°C will reduce the service life by 50%.
Different kinds of pressure fluids should not be mixed as
this might cause sludge or gumming. It is recommended to
flush the system prior to any change of the fluid type and
to contact the fluid manufacturer.
The fluid should be drained while the system is
warm. Used oil should be disposed professionally.
Heavily aged or contaminated fluid can't be improved
by simply adding fresh fluid.
The hydraulic fluid has to be filled-in via the system
filter or via a mobile filtration system. The absolute
filter rating for this initial filtration must be at least as
high as the rating of the system filter.
Fluid samples have to taken and tested for
contamination kind, size, and level with the results
being documented.
The complete hydraulic system has to be depressurized
prior to any works at accumulators. No soldering, welding,
or machining is allowed at hydraulic accumulators!
Incompetent handling may cause severe accidents!
Check the setting of system and control pressure.
Any pressure re-adjustments should be documented,
as this may be a sign of wear.
When repeated readjustment of the pressure valve
becomes necessary to achieve the specified setting, it
indicates wear of the pressure valve.
Check the tubes and hoses for external leaks.
It is most important that the system is completely
depressurized prior to removal of fittings, hoses or other
components. Leaks at joints sealed via soft-iron rings, O-
rings or other contoured seals cannot be solved by simply
re-tightening of the joint (observe the perm. torque) as the
seal material has hardened or is otherwise damaged.
Seals should always be replaced and not reused.
Check the function of control and monitoring devices
(pressure gauges and pressure switches).
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