Bat wing rotary cutter gear oil?

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I'm looking to put the best gear oil I can in my land pride 5615 rotary cutter gearboxes. The manual doesn't state anything special besides 80w-90 with EP additive. I do actually run the machine about 630 pto rpm instead of the typical 540 rpm. It cuts alot better in vibrates alot less. I figure in the 110 degree Texas heat that may add some extra heat to the gearboxes from the over speed. I'm thinking about using either a SAE j2360 mil spec oil or either the Motul gear 300 which is a very expensive ester oil. I see nothing but rave reviews about the motul pro gear. [Linked Image]
 
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if you think they are getting extra hot perhaps consider the next thicker grade of gear oil ? 75w110?
 
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Originally Posted by Jmoney7269
It's not getting extra hot.... I can hold my hand on the gearbox for a few seconds..... no hotter than a typical differential
I don't see the need for concern. Your "return on investment" will likely be zero. Hitting big rocks and tree stumps will kill your gearboxes, but with just smooth pasture - they'll outlive you.
 
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