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Allis Chalmers 616/620/720 Drop Box Oil

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coggonobrien View Drop Down
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Joined: 14 Nov 2010
Location: Eastern Iowa
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Post Options Post Options   Thanks (0) Thanks(0)   Quote coggonobrien Quote  Post ReplyReply Direct Link To This Post Topic: Allis Chalmers 616/620/720 Drop Box Oil
    Posted: 07 Apr 2021 at 9:48am
What is the correct oil for the drop axle housings? Simple tractors said AC Gear Lube 715 0.5 quarts per side. Is this right? What's a modern equivalent?

Thanks
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tadams(OH) View Drop Down
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Joined: 17 Sep 2009
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tadams(OH) Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2021 at 2:26pm
I put 80 - 90 weight in mine.
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Steve in NJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2021 at 12:02pm
I used 75-140 Vavoline synthetic gear oil in mine. 
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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