Posted by sotxbill on May 27, 2017 at 07:46:14 from (104.5.24.112):
In Reply to: Synthetic oil posted by bcdave on May 26, 2017 at 07:24:50:
Oddly newer bobcats and other hydraulic machinery are going to detergent hd oil.. They found it cuts wear significantly.... while older machinery originally ran virgin hydraualic oils, and later machinery ran improved hydraulic oils.. with anti foam additives, moisture additives, dry start additives, and oring conditioners added to them. Virgin hydro oil was an oil with no additives, but refined to a specific viscosity rating. So it was a very very basic oil.
A lot of equipment today will say, if you cant get "our" hydo oil, run 15w-40 hd motor oil... so the industry is changing.
I would always run at a minimum a "tractor" rated hydraulic oil as mentioned above to get the needed additive package. If new equip, check for the newer specs for the "AW hydraulic oil" (antiwear) requirements to insure that you dont damage the pumps with the much higher pressures and heat of the newer pump designs.
AW hydro oils are for equipment that runs hydraulic pumps only!!!!!
CAUTION!! most tractors have wet clutches for either brakes or pto, or dual power, power shifts etc... you have to limit the amount of anti friction additives or your brakes and clutches will slip and become useless. So you must NOT run the best oil, but you must run the correct oil.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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