Hydraulic fluid recommendation for OC-46?

[Ed Miller]

Anyone have a recommendation for a good multi-viscosity hydraulic fluid for the OC-46?   While I'm doing my backhoe cylinder replacement I thought it would be a good time to flush the system and replace the fluid.   I've got an end loader on the unit also.   What is the best way to get most of the old fluid out of the system.   I don't want to go nuts to drain every drop.   Is there a strainer or filter for the fluid?

Thanks
Ed

[Ed Miller]

I got some answers on my question about Hydraulic Fluid in case anyone  else has the same question and does a search.   When I called Zimmerman's they recommended AW46.  The hydraulic shop I use asked their supplier and they thought the closest match for the 10W supplement 1 engine oil / Type A Automatic Transmission fluid recommended in the manual was AW32.    I did a little internet searching and this is what I learned.  

 My first question was what was the " Supplement 1" referring to?  From what I  found online it seems to be a reference to a MIL (military) standard for oil that was used in the 60's to signify a high quality engine oil.  I also found some information on the viscosity of the various oils.   It turns out that the Type A Automatic transmission fluid is more viscous than the 10W engine oil.  When I compared the recommended fluids with the AW32 and the AW46 I found that the AW32 was close to the 10W engine oil (just a little less viscous) and the AW46 was close to the Type A Automatic Transmission fluid (just slightly more viscous).  Based on this I decided to use the AW46 since I figured with a worn system, the higher viscosity might help.    I guess if you used the machine in a cold climate, the AW32 would be a better choice.  Hope this helps  others with similar questions.

I attached some of the info I found on the internet if others are interested.

Ed

[hotratz]

Good information, Thanks for the research.