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HD-10 transmission fluid recommendations?
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Darkmafia1950 View Drop Down
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Joined: 24 Aug 2020
Location: Portola,CA
Points: 14 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Darkmafia1950 Quote  Post ReplyReply Direct Link To This Post Topic: HD-10 transmission fluid recommendations?
    Posted: 12 Jan 2022 at 12:18am
Hi, I was wondering if anyone can give me some advice on what transmission fluid type they have used in their machines. 2 HD-10 manuals I have found say use SAE 90 or SAE 140. Then I found another manual that says use SAE 30 or 50 motor oil. I know I have to be picky about oil type due to the neoprene bushings and brass/copper parts used. 
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 81338 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 2022 at 6:41pm
SAE 50 wt ..... too many addatives in gear lube
Like them all, but love the "B"s.
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Codger View Drop Down
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Joined: 23 Dec 2020
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Points: 2041 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 2022 at 7:57pm
Both SAE 50 engine oil, and SAE90W gear lube have the same viscosity and can be used in the gearbox and finals if a manual transmission. However with SAE90W I would only use an oil meeting the GL-4 specification. I would not use GL-5 in older units. When GL-5 first came out it was very hard on brass and soft metals due to chemical composition. I've been told this has been rectified, but GL-4 was always safe and remains safe for use in older gearboxes using brass and bronze bushings/bearings/syncronizers, etc.
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