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hd 21-b dozer
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ctaxle View Drop Down
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Joined: 12 Jun 2023
Location: ellington, ct
Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ctaxle Quote  Post ReplyReply Direct Link To This Post Topic: hd 21-b dozer
    Posted: 12 Jun 2023 at 7:59am
customer tells us that the transmission uses ATF dexron3. does that sound right? does not have good manual on the unit. thank you , pete
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Ray54 View Drop Down
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Joined: 22 Nov 2009
Location: Paso Robles, Ca
Points: 4545 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ray54 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jun 2023 at 11:38am
I don't think anything newer than original dextran was around when that transmission was designed. I know my uncle used 2 or 3 different products over the 30 years he ran his HD 21. I believe the last years he used a Mobil oil product, probably hydraulic/transmission fluid. But cannot say for sure as he has been gone 20 years, as well as the tractor. So no help. 
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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: 12 Jun 2023 at 1:21pm
Dexron will work but I would use a transmission oil meeting Allison C-3 , or TO-4 specifications as it is backward compatible.

Dexron use is really for very cold weather operations but again, it will work.

If you will post the tractor serial number I'll attempt to get you a manual in soft copy.
That's All Folks!
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ctaxle View Drop Down
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Joined: 12 Jun 2023
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ctaxle Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jun 2023 at 2:33pm
thank you for the info. where would i find the serial number? Pete
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DMiller View Drop Down
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Joined: 14 Sep 2009
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Points: 31098 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jun 2023 at 5:31pm
As with my 7G when had it, UNDER 30F was Recommended to change to Type A ATF, Whale Oil Based and NLA, Dextron was the replacement and NOT advised for the Power Shift Boxes.  Use 10W Hydraulic Trans Oil or HYTRANS Fluid.
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Joined: 12 Jun 2023
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ctaxle Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2023 at 11:13am
thank you dmiller!
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Joined: 10 Nov 2022
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Points: 33 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DieselBumpkin Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2023 at 7:53pm
Not to add to the confusion, but going from memory, the original Dexron had whale oil in it, and Dexron II was the replacement for it that caused transmissions to fail because it couldn't lubricate as well. Dexron III did a lot better than Dexron II and can handle higher temperatures which isn't needed here. There was a lot of backward compatibility to a point. Modern ATF like Dexron III is thin as water and has additives to keep friction material suspended so it's picked up by the filters. It works great for cleaning caked on grease off cars. Makes sense that they would recommend ATF at low temperatures.
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