The
KISS Principle IV
Hydraulic System
Last week we ended by noting heat build up is minimal as we use nearly
all of our input horsepower to perform a work function. Using
power to perform work does not appreciable add to system heat.
Hydraulic oil flow under pressure consumed as a leak through a worn
pump or motor, passing over a relief valve, pressure drop through hoses
and fittings, or through a compensator valve will add heat directly in
proportion to the pressure drop and flow loss inherent in the complete
system.
In addition to the efficient use of pressurized oil, a large hydraulic
oil sump is included in our systems. This allows for additional dwell
time in the sump which enhances natural cooling and dissipation of any
air entrained within the oil.
These and other design criteria allow us to eliminate the need for an
oil cooler, including its direct and installation cost thereby reducing
the price of the machine to our customers.
Perhaps the most important reason is eliminating the need for a machine
owner to clean out a chaff/dirt filled oil cooler to keep the oil cool.
If the system stays cool naturally, you will not experience a “cooked”
hydraulic system that needs high cost replacement parts.
How do you know if a hydraulic system is over heated. I have observed
operators say it is so hot I can’t touch it, and it may be hot, but is
it too hot. An old rule of thumb says that up to 15 Degrees F. over
ambient is acceptable. This equates to about 225 Degrees in most climes.
When you consider that 140/145 Degrees F. is scalding, and will blister
your skin, touching is probably not an accurate test or a safe
practice.
Continued next week.
Brads Blog, “The Finer Cut”, is another of
many
planned. Each issue will cover a topic of interest about our machines,
our industry, our customers and more. I look forward to this task and
am excited about the opportunity to broaden our communications with our
customers and industry. I invite you to return and visit from time to
time, cruising back through issues to see what I may have been thinking
of at another time.
I also invite you, our reader to contribute by offering your comments.
Please send your thoughts to Brad@orbitscreens.com
, by letter or fax, 563-922 9060.
Happy screening
Brad Schnittjer
Blog # 09-8
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