Hydraulic pumps getting hot

Find the manual for your particular pumps.
From: Parker Hannifin
“Hot oil” is a relative term. In most cases, 120° F
(49º C) at the reservoir is considered an ideal operating
temperature. Always take an oil temperature reading
at the reservoir, not at a component or any of the
piping. Some hydraulic systems are designed to
operate at 130° F (54º C) or higher. If you don’t
know the maximum operating temperature for your
equipment, check your component manual for
temperature and viscosity limitations.
 
MParr said:
Find the manual for your particular pumps.
From: Parker Hannifin
“Hot oil” is a relative term. In most cases, 120° F
(49º C) at the reservoir is considered an ideal operating
temperature. Always take an oil temperature reading
at the reservoir, not at a component or any of the
piping. Some hydraulic systems are designed to
operate at 130° F (54º C) or higher. If you don’t
know the maximum operating temperature for your
equipment, check your component manual for
temperature and viscosity limitations.
Click to expand...
Good stuff MParr. In particular the location (reservoir) to assess the temperature.

Only thing I would add is;

This applies to the oil that came with or recommended for, the system - it's not unusual for the OM oil to have been replaced with something diffrent. Added to this is the ever changing formulations that may be used.- Check with the oil manufacturer for your oils optimum operating temperature range - be sure to mention this is for a hydraulic system, not an engine.

:devilish:
 
Not unusual for hydraulic oil to be 100 degrees above ambient air temperature. And with a hydrostat system they are not continuous flow from pump to cooler to tank. Depending on efficiency of the system most of the oil gets return between the pump and wheel motor multiple times before returning to tank. for filtration and return to system.
 
As far as the Mobil (no "e") 1, it's good stuff. No oil is pure Group IV or V, but rather blended as to make a quality finished product. The two have very different characteristics, and many top-tier motor oils are a blend in order to get the benefits of both. Of course, Group III base stocks have come a long way, to the point that they rival Group IV performance in some areas. Bottom line, oils today are light years ahead of oils from past years. If air-cooled equipment from yesteryear survived on Group I oils, we have nothing to worry about with current offerings, especially synthetics. The tribologists working for E-M, etc get paid big bucks to worry about the exact formulations...all we need to do is choose a finished product from the company of our choosing, keep it topped off, and change at a reasonable interval.
 
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