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only AC orange 
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Joined: 06 Dec 2014
Location: Eastern Indiana
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 Topic: D-15 series II
Posted: 05 Jan 2026 at 6:27pm |
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D-15 series II with factory 3 point hitch - are the lift arms cat. 1 or cat. 2? If cat 1, is there not enough iron in the set up to handle cat 2 equipment? Has anyone ever exchanged the cat 1 arms for cat 2 arms? What might the consequences be?
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EPALLIS
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Joined: 12 Sep 2009
Location: Illinois
Points: 1167
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Posted: 05 Jan 2026 at 6:54pm |
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i have a D-15 series II with factory 3 point hitch. They are lift arms cat. 1. They are original. It was one of the first models built in 1966. Hope that helps.
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DrAllis
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Posted: 05 Jan 2026 at 9:46pm |
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All D-15 tractors were equipped with a category "1" three-point hitch. It was (for the most part) quite light-duty in design and if used extensively on a moldboard plow for example, didn't hold up well at all for many owners. Broken draft arms and bolts that held the torsion bar up underneath the tractor would work loose and then a catastrophic failure could occur. Changing the draft arms to a heavier Cat #2 design might solve that issue but not the torsion bar bolts or framework. There are lots of previous posts about this subject on this website and mostly negative.
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Nathan (SD)
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Joined: 11 Sep 2009
Location: Day County SD
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Posted: Yesterday at 8:28am |
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The D15 series 2 was available with a 3pt carrying system. Allis-Chalmers inadvertently advertised it as a hitch.
The snap coupler is a hitch.
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Ed (Ont)
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Joined: 08 Nov 2009
Location: New Lowell, Ont
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Posted: 21 hours 32 minutes ago at 10:33am |
 Nathan (SD) wrote:
The D15 series 2 was available with a 3pt carrying system. Allis-Chalmers inadvertently advertised it as a hitch.
The snap coupler is a hitch. |
The whole world referred to it as 3-pt hitch. Including the inventors - Ferguson and Massey Ferguson! Semantics - Lol!!!!! 
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PaulB
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
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Posted: 21 hours 18 minutes ago at 10:47am |
The D15II could be either Cat I or Cat II. Mine had the Cat II 3pt when I got it. It also have been welded and patched many way and 4 the holes in the bottom of the transmission case and lift housing where about ruined. I was able to repair the 2 in the transmission, but the 2 in the lift housing had already been enlarged and had those threads pulled out. What a pispoor design, it should have been like the D17 IV. After making the repairs it is now a SnapCoupler tractor and nothing has loosened up since I've owned the tractor.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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DSeries4
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Joined: 12 Sep 2009
Location: Ontario, Canada
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Posted: 17 hours 32 minutes ago at 2:33pm |
I have 2 D15 IIs with factory 3 point. Both are Cat 1. One barely has a scratch on it, the other has been welded many times in many places. Definitely not one of AC's best efforts. If you plan on doing lots of 3 point work, get a D17 series 4 with factory 3 point - they are bulletproof.
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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DrAllis
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Posted: 14 hours 48 minutes ago at 5:17pm |
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I had to go and dig up my D-15 S2 literature books. The book dated July of 1963 says Category #1 three-point hitch. The newer book dated Sept of 1966 says Category #1 is the standard three-point hitch and Category #2 was OPTIONAL equipment. I've never seen a Cat 2 hitch on a D-15 S2. Were the balls just bigger?? or 2-hole sized balls?? Sounds like they didn't beef it up any from Cat 1.
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PaulB
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
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Posted: 12 hours 13 minutes ago at 7:52pm |
DrAllis wrote:
I had to go and dig up my D-15 S2 literature books. The book dated July of 1963 says Category #1 three-point hitch. The newer book dated Sept of 1966 says Category #1 is the standard three-point hitch and Category #2 was OPTIONAL equipment. I've never seen a Cat 2 hitch on a D-15 S2. Were the balls just bigger?? or 2-hole sized balls?? Sounds like they didn't beef it up any from Cat 1. |
The balls just had bigger holes and a bushing was used if it was desired to hitch to a Cat I implement. This is shown in the parts book I have (March 1982). The only parts different for the Cat II 3pt hitch are the draft arms and the implement end of the top link.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Pat the Plumber CIL
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Joined: 11 Sep 2009
Location: Springfield,Il
Points: 4982
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Posted: 23 minutes ago at 7:42am |
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Biggest problem with the D15sII is people using it like it was a D17 . I believe Allis Chalmers put the light weight Cat 1 3pt on it to keep the user from trying to use it for more than it was intended. Yes a heavier 3pt like the 17,19 ,185,190 would have been stronger and more dependable but probably would have led to drive train ,rear end and transmission problems. Stick with the cat1 and use the tractor as intended.
Never seen a D15SII with cat 2
Edited by Pat the Plumber CIL - 22 minutes ago at 7:43am
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You only need to know 3 things to be a plumber;Crap rolls down hill,Hot is on the left and Don't bite your fingernails
1964 D-17 SIV 3 Pt.WF,1964 D-15 Ser II 3pt.WF ,1960 D-17 SI NF,1956 WD 45 WF.
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