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September - October 2016
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45
Viscosity Change — If the viscosity
were to decrease, the flow would
increase (depending on the pump and
system design).
Filter Collapse or Bypass
Malfunction — If the filter was causing
reduced flow and then burst, or
there was a malfunction with the
bypass that allowed flow to increase,
both would result in an increased
cylinder speed.
Air Entrainment — Air in the fluid
will cause poor (slow) performance. If
the air problem is corrected, the
system will speed up.
Oil Line Cleared — If a restricted or
blocked oil line becomes unrestricted/
unblocked, the fluid flow will increase.
Change in Load — If the load on
the cylinder is reduced, it may increase
cylinder speed.
These are just a few things that may
be plaguing the hydraulic system. In
order to provide a more comprehen
-
sive diagnosis, more details would
need to be known, such as the
system design, seal health, filter type
and age, contamination levels,
cylinder position, etc.
Keep in mind that not all hydraulic
cylinders are created equal. It is estimated
that up to 25 percent of mechanical equip-
ment failures are design related. In regards
to hydraulic cylinders, this suggests as
many as one in four are not adequately
designed for the application in which they
are operating. So if the hydraulic cylinder
suffers recurring failures, it is likely that
design modifications will be required to
break the cycle of failure and repair.
If you have a question for one of Noria's
experts, email it to editor@noria.com.
