What Hydraulic to use AW32 or AW46

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    • July 19, 2013 at 11:34 am #30792
      lenbo
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        I have a Jinma 348 with a Z30FEL and a LW7 BH. I have been using AW32 hydraulic oil and in the process of putting all new fluids in as soon as I finish rebuilding some hydraulic cylinders. I have been told to use AW32 or AW46 depending on where you live.  I live in GA and it is usually in the 90s six months out of the year and can get down in the teens or below freezing in the winter for part of the time.  In the warmer part of the year AW46??? Also been told that using heavier oil will produce a hotter oil temp (wear seals out faster). Should I just stick with AW32 year round?

         

        Thanks

        len

      • July 19, 2013 at 5:35 pm #36206
        Bob Rooks
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          lenbo wrote:

          “Also been told that using heavier oil will produce a hotter oil temp (wear seals out faster).”

          Not sure where you heard that lenbo, but it is pure bunk. A good operating temperature for most hydraulic oils is around 150° F sustained with around 200° F being maximum. The scraper rings on hydraulic cylinders are usually good for 300° to 400° F, and most Nitrile, Neoprene, or Buna-N components are in the same neighborhood with Silicone being higher. I use a multi-viscosity (multi-vis) hydraulic oil in all of my equipment. It's rated AW ISO 32/46/68, and is available through most manufacturers. If you prefer to run a straight grade, I would recommend the AW 32. If in doubt, check the operating temperature with a gauge or hand held gun. None of these machines have hydraulic oil coolers on them, they rely on heat dissipation from the volume of the reservoir.

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        • July 20, 2013 at 7:39 am #36207
          lenbo
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            Bob:

            Thanks for the information. I have looked around for the multi-viscosity ISO AW 32/46/68 and none of the shops around hear have it. What brand do you use? I'll look to get it off the net.

             

            Thanks much

            Len

          • July 20, 2013 at 9:02 am #36209
            Bob Rooks
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              I use O'Reilly Auto Parts house brand. I believe it's repackaged by Citgo. It meets all specs. Here is a short read on multi-vis hydraulic oils. It's a few buck more than a straight grade oil but I believe the benefits are worth it.

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            • July 20, 2013 at 9:41 am #36210
              Tinbender
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                Interesting. I'll be changing mine out this winter and the local O'Reilly's has it in stock, and I have an account there.hmmm

              • July 20, 2013 at 3:02 pm #36211
                lenbo
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                  Bob

                  Thanks much!

                  There is a O'Reilly Auto Parts  about 15 miles away (the only auto store or tractor store I didn't check) and I just called them and they have some in stock.  Will be picking up several 5 gallon buckets tomorrow.

                  Good read on the multi-vis hydraulic oils.

                   

                  Thanks again

                  Len

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