Yanmar F395D Front End Lubricant

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I would like to service the front diff of my Yanmar F395D. I know there are very few that own this exact tractor but I would assume that most Yanmar 4WD tractors would use the same lube. If you can post what lube your tractor uses I would appreciate it. If most are 90W I will use that, if most are the same fluid that the tranny and rear end use, that is what I will use. BTW, I have a parts manual but can not find any info on lubricant. Thanks in advance for your help.

Randy Baker
Red Bluff, CA