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Allis Chalmers Discussion Forum

AC Model B pulling a rotary cutter.

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Tom Hallick

01-22-2004 20:26:49

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I would like to purchase a rotary cutter for a 1947 AC B. Does anyone recommend a particular brand? Howse and King Kutter are the only ones that I can find with the pull-type cutter. What size would you recommend? 4' or 5'. Will I have to make any modifications to the cutter for it to fit the PTO on the back of the tractor.? I will be cutting some heavy brush along with clover and tall grasses. Thanks in advance for all your responses.

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01-26-2004 20:05:15

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Re: AC Model B pulling a rotary cutter. in reply to Tom Hallick, 01-22-2004 20:26:49

we have been pulling a 5' john deere brush hog for 30+ yrs with my fathers c. we used it more for finish work cutting 2-3' grass to about 8". it worked quite well. he did have to cut down the pto slip shaft so he could turn sharper. we dad not have an overrunning clutch ( dad was always too cheap to buy one) and it was harry around ditches learned real fast to kick the pto out of gear so the mower wouldn't push us along. AJ

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01-23-2004 17:32:16

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Re: AC Model B pulling a rotary cutter. in reply to Tom Hallick, 01-22-2004 20:26:49

I have been pulling a bush hog brand for about 5 years. I mean it when I say these tractors can pull! I'v been through the weeds out in the swamp grass when I was eating the grass sitting on the seat and with the 4' unit it will pull great. I will say that of the two ac b's I have (one a 42 and the other a 48) one has more "balls" than the other one. I also chop the corn stalks with the little 48 and it will handle two rows with no problem. I'm sold on the bush hog! I would say that I've learned a few things doing it thou and would like to pass them on to you:
1. Don't think that stright up a hill will be the best way to go! 2. I have had the pto apart half a dozen times because a .25 cent woodriff key that holdes the pto shaft to the drive has sheared. Good thing though I get to change the tranny fluid quite reguarly. The reason this happens is the overrunning pto cluch is wise thing to have. Also turnning when the pto is running. The latter is something more common. I think I have got a short u joint setup and it bends to short. 3. the tractor is almost twice as old as I am, when I need a rest it has more than earned a rest!!! I hope I have helped and I hope you have a great time with anything you do with an allis b. Good luck. ED

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Tom Hallick

01-23-2004 17:48:07

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Re: Re: AC Model B pulling a rotary cutter. in reply to ed, 01-23-2004 17:32:16

Ed,

Wow! Thanks for all the insight. Is your Bush Hog a standard pull-type? Do you just hitch it up to your drawbar and pto and away you go? Finally, does Bush Hog still make the 4' pull-type rotary cutter? Thanks again.

Tom

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01-23-2004 18:01:29

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Re: Re: Re: AC Model B pulling a rotary cutter. in reply to Tom Hallick, 01-23-2004 17:48:07

Yes it is a pull type. I can't tell you the model yet because when I got it it was gone but give me time and I'll call the guy I got it from and ask I know he would know. As to if I hitch and run the answer is yes. I went to the tractor supply and got a sleve that took the pto shaft from 1 1/8 to the hogs pto of 1 3/8. run a nail through the "bolt" hole and bent it over. AC had a special type draw bar they used but I don't have any thig but the old "half moon" shaped one. I will take a smaller pin in the hitch than other tractors will. I hope I've Helped

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01-23-2004 17:37:33

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Re: Re: AC Model B pulling a rotary cutter. in reply to ed, 01-23-2004 17:32:16

By the way there is no three point hitch made on the original ac b. One would cost you around the three hundred mark. Worth it? I find many thing work when you don't have one.

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Jay C (MO)

01-23-2004 10:24:16

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Re: AC Model B pulling a rotary cutter. in reply to Tom Hallick, 01-22-2004 20:26:49

You will need the over-running clutch to keep the mover from pushing the tractor when trying to stop and to adapt from the standard 1 1/8" PTO spline to the 1 38" that will come with the newer cutters. I have a 48 b and cut with a 4' Razor cutter that I found used. It had plenty of power to cut with the mower but if I were you I would keep the brush cutting to under 1 1/2" in diameter.

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Tom Hallick

01-23-2004 16:52:40

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Re: Re: AC Model B pulling a rotary cutter. in reply to Jay C (MO), 01-23-2004 10:24:16

Jay,

Thanks for all the information. Where can I get a over-running clutch and a 1 3/8 inch spline? Are they difficult to install? Thanks again for your time.

Tom

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Jay C (MO)

01-25-2004 07:04:17

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Re: Re: Re: AC Model B pulling a rotary cutter. in reply to Tom Hallick, 01-23-2004 16:52:40

Any tractor supply store should have the over running clutch. The female end of over running clutch will be 1 1/8" and fit over your pto shaft. The other end of the clutch will be the needed 1 3/8" for your implements. I found that the roll pin provided with the clutch was too large for the hole in the pto shaft. Measure the hole in your pto shaft (what I refer to as the spline) and buy the appropriate size (tad larger than hole) roll pin to install the clutch

Istall is easy. Remove gease fitting screws from over running clutch and turn until all holes line up and you can see all the way through. Insert the clutch over your pto shaft making sure the holes in the clutch will line up with the hole in the shaft. Once they line up, insert roll pin. Roll pin should be just a tad larger than the pto shaft hole so that it holds itself in place. Insert far enough so that the clutch spins the way it is designed to. The ends must clear the outer edges of the clutch. Once roll pin is inserted replace one of the screws. My over running clutch came with a grease fitting. I then installed the gease fitting and greased it up. The instructions I had stated not to leave the grease fitting in the clutch during operation, so I removed it and replaced the the original screw.

Hope that helps.

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Josh

01-23-2004 08:50:35

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Re: AC Model B pulling a rotary cutter. in reply to Tom Hallick, 01-22-2004 20:26:49

I think 4' would be better matched to the B. Those little tractors are tough, but i think in heavy mowing it would be an awful hard pull.

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Tony C

01-22-2004 22:46:43

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Re: AC Model B pulling a rotary cutter. in reply to Tom Hallick, 01-22-2004 20:26:49

A 4ft cut 3 point mower with a slip clutch will work fine . Tony

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