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Selasa, 17 Agustus 2010

Air, would you start an engine with no oil in the crankcase?

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Hello again Air,

In your last hydraulic maintenance email, I explained
how to add oil to a hydraulic system - without the dirt.

Today I want to clear up another popular misconception,
about the installation of hydraulic components ...

Myth #4. Because oil circulates through hydraulic components
in operation, no special attention is required during
installation beyond bolting the component on and
connecting its hoses.

Nothing could be further from the truth,
as this example illustrates:

I recently conducted failure analysis on a hydraulic motor
that was the subject of a warranty claim. The motor
had failed after only 500 hours in service, some
7,000 hours short of its expected service life.

Inspection revealed that the motor's bearings had failed
through inadequate lubrication, as a result of the
hydraulic motor being started with insufficient oil
in its case (housing).

After this motor was installed, its case should have been
filled with clean hydraulic oil prior to start-up.
Starting a piston-type motor or pump without doing so,
is similar to starting an internal combustion engine
with no oil in the crankcase -
premature failure is pretty much guaranteed.

For more on these and many other hydraulics tips,
point your browser to:

Yours for better hydraulics knowledge,

Brendan Casey
Author of 'Insider Secrets to Hydraulics'; and
'Preventing Hydraulic Failures'.


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