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Sunstar Hydro Oil change

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I need to change the hydro fluid and filter in my Sunstar.  Can I drain the hydro fluid by removing the plug shown in the attached photo?  The operators manual says to drain by loosening the hose that feeds the pump.  Removing the plug seems easier and simpler.

Also, I saw a discussion topic from October/November 2018 regarding Universal Trans / hydraulic  fluid and Type F transmission fluid.  The operators manual says to refill with Type F tranny fluid and I saw posts from others who indicate they refill with Universal Trans / hydraulic  fluid.  

Can Universal Trans/hydraulic fluid be used or should I stick to Type F tranny fluid?


Thanks in advance for help with these questions. 

Hydraulic plug.jpg

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