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post #1 of (permalink) Old 08-30-2005, 11:38 PM Thread Starter
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Hydraulic fluid viscosity properties in PS pump

A full hydro system creates a ton of heat when used under pressure. (ya'all knew that already [img]/ubbthreads/images/graemlins/grin.gif[/img])

In my ongoing quest to keep the heat down without spending horsepower, torque, and electricity doing so. I am questioning the heat properties of different viscosity fluids for hydraulic pumps. And are they safe for my Saginaw pump.

Lower viscosity = less heat

How low can I go before I see increased internal leakage, and excessive wear?
What is the viscosity of regular P.S. fluid?
Anyone ever use anything other than regular P.S. fluid?

I'm guessing it's a pipe dream that I can actually have a cooler running steering system by changing fluid, but I thought I would ask...
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post #2 of (permalink) Old 08-31-2005, 01:35 AM
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Re: Hydraulic fluid viscosity properties in PS pump

id get a small oil cooler and pipe it into the low pressure side(return) before risking pump damage to a nice pump like that---but ill bet saginaw could tell you how low is OK in that pump
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post #3 of (permalink) Old 08-31-2005, 09:45 AM
 
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Re: Hydraulic fluid viscosity properties in PS pu

Yup, I agree.

Thinner fluid = pump failure.

It's not as much of how thick the fluid is, but will it lubricate a high speed device (pump) during operation.

First off, use a newer style pump, like off a Cad or Olds.
Forged aluminum pump case is stronger, sheds more heat.
Built in plastic resivior give up heat like crazy, sure beats old style metal tanks.

Add an oil cooler in hot weather. Heavy service vehicles have been doing it for years with great success.

Why reinvent the wheel?
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post #4 of (permalink) Old 08-31-2005, 10:05 PM
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Re: Hydraulic fluid viscosity properties in PS pump

Might check into the Synthetics....

<u>Neo</u>

<u>Red Line</u>

<u>Valvoline</u>

Should last much longer and provide better lubrication at higher temperatures.

[img]/ubbthreads/images/graemlins/40BEER.gif[/img]
Dale
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post #5 of (permalink) Old 09-01-2005, 10:03 PM
 
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Re: Hydraulic fluid viscosity properties in PS pump

john deere hydraulic oil is all we run in our saginaws with full hydro. thicker than PS fluid, and ours stay cool just fine.
get the largest TUBE type cooler, the radiator type coolers provide to much restriction.
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