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Some D21 ?'s
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AaronH View Drop Down
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Joined: 12 Sep 2009
Location: WI
Points: 601 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AaronH Quote  Post ReplyReply Direct Link To This Post Topic: Some D21 ?'s
    Posted: 21 Jan 2010 at 5:53pm
ya. we prolly seen this ? before. Besides the obvious turbo, what set them apart? Anything? I thought I remember hearing the early series 1s had small diameter axels.. True? On the hood, are the exhaust holes in the same spot?
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DarrylinWA View Drop Down
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Joined: 12 Sep 2009
Location: Amarillo Texas
Points: 1898 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DarrylinWA Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jan 2010 at 6:06am
The rear end bull gears are thinner. The axles are the same at 3.25 Dia. The series 1 tractor had a muffler under the hood with no turbo and the exhaust was ahead a little in the hood.  Smaller air clearner with more of a mushroom top through the hood. I think most or all the the series 1 tractors also had the chrome grills too.Made only 1129 Series 1 tractors. Series 1 is also a little bit lighter,cant rembember why but around 400 to 600 lighter ? Thats what I can think of right now.
 
Hope this helps. Take care, Darryl
B 10 Custom. Serial # 1001 D21, First D21 built 69 #4498 and Last D 21 Built #4609. 1946 MM UTU. And 2000, 2005 Pete's. AC custom Hauling.
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Calvin Schmidt View Drop Down
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Joined: 11 Sep 2009
Location: Ontario Can.
Points: 4515 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Calvin Schmidt Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jan 2010 at 9:40am
At serial 3596 the D-21's got the heavier bull gears at the factory. Allis had a field update program and every earlier serial number D-21 series II that we have had apart had the larger bull gears. I'm told the update was an ugly job for the dealer because the bottom of the housing had to be ground out for more clearance.
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Dave(inMA) View Drop Down
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Joined: 12 Sep 2009
Location: Grafton, MA
Points: 2395 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave(inMA) Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jan 2010 at 10:42am
I bet someone at AC wasn't too happy about absorbing the re-engineering and machining costs necessary to create more room inside the housing at the factory! Wonder what that cost back then?
WC, CA, D14, WD45
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