Half/Pack
®
Issued April 2018
Pump
Copyright 2018, Heil Environmental
Printed in the U.S.A.
Pump
34
PUMP MAINTENANCE (CONTINUED)
CAUTION
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).
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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