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Section V – Service, Inspection and Maintenance
A. Service Tools
No special tools are required to service these pumps.
B. Inspection
Periodic inspection of the fluid condition and tube or piping
connections can save time-consuming breakdowns and
unnecessary parts replacement. The following should be
checked regularly.
1. All hydraulic connections must be kept tight. A loose
connection in a pressure line will permit the fluid to leak out.
If the fluid level becomes so low as to uncover the inlet pipe
opening in the reservoir, extensive damage to the pump can
result. In suction or return lines, loose connections permit air
to be drawn into the system resulting in noisy and/or erratic
operation.
2. Clean fluid is the best insurance for long service life.
Therefore, the reservoir should be checked periodically for
dirt or other contaminants. If the fluid becomes contaminated,
the system should be drained and the reservoir cleaned
before new fluid is added.
3. Filter elements also should be checked and replaced
periodically. A clogged filter element results in a higher pressure
drop. This can force particles through the filter which would
ordinarily be trapped, or can cause the by-pass to open,
resulting in a partial or complete loss of filtration.
4. A pump which is running excessively hot or noisy is a
potential failure. Should a pump become noisy or overheated,
the machine should be shut down immediately and the cause
of improper operation corrected.
C. Adding Fluid to the System
When hydraulic fluid is added to the system, it should always
be poured through a fine wire screen, 200 mesh or finer.
It is important that the fluid be kept clean and free from any
substance that may cause improper operation or wear to the
pump and other hydraulic units. Therefore, the use of cloth to
strain the fluid should be avoided to prevent lint from entering
the system.
D. Adjustments
No periodic adjustments are required other than to maintain
proper shaft alignment with the driving medium.
E. Lubrication
Internal lubrication is provided by the fluid in the system.
Lubrication of the shaft couplings should be as specified by
their manufacturers.
F. Replacement Parts
Reliable operation throughout the specified operating range
is assured only if genuine parts are used. Sophisticated
design process and material are used in the manufacture of
our parts. Substitutes may result in early failure. Part
numbers are shown in Table 1.
G. Product Life
The longevity of these products is dependent upon
environment, duty cycle, operating parameters and system
cleanliness. Since these parameters vary from application to
application, the ultimate user must determine and establish
the periodic maintenance required to maximize life and
detect potential component failure.
H. Troubleshooting
Table 4 lists the common difficulties experienced with vane
pumps and hydraulic systems. It also indicates the probable
causes and remedies for each of the troubles listed.
It should always be remembered that many apparent pump
failures are actually the failures of other parts of the system.
The cause of improper operation is best diagnosed with
adequate testing equipment and a thorough understanding
of the complete hydraulic system.