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Ford 9N, 2N & 8N Discussion Forum
:

1 1/8'' vs 1 3/8" PTO shafts

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JustBill

06-24-2020 18:11:45




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I think I need an education on the relative merits of the 1 3/8" PTO shaft. As I understand it, it is more robust, but unless you replace the hydraulic pump you are still stuck with 1 1/8" shaft as it goes into the hydraulic pump. What am I missing.




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Caryc

06-26-2020 18:37:15




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 Re: 1 1/8''''''''''''''''''''''' in reply to JustBill, 06-24-2020 18:11:45  
I replaced my 1 1/8" shaft with a 1 3/8" shaft purchased right here on YT. Yes the splined shaft is a little longer as you said but the shaft I got here came with a new PTO cover already on it so there was no problem.



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jimtrs

06-25-2020 04:38:19




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 Re: 1 1/8'''''''''''''''' vs 1 3/8" in reply to JustBill, 06-24-2020 18:11:45  
Quoting Removed, click Modern View to see

Never heard of or seen such an animal. As Shaun said, just the output size of the shaft is different between the two.

Quoting Removed, click Modern View to see

Right.

In fact, if you use something like an 1-1/8 belt pulley, you need the 1-1/8 PTO



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Tim PloughNman Daley

06-26-2020 02:47:19




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 Re: 1 1/8'''''''''''''''' vs 1 3/8 in reply to jimtrs, 06-25-2020 04:38:19  
Yep, I forgot to add that important piece of info in my earlier post. The 1-3/8" splined PTO shaft is only the output end as Jim said. You don't buy a whole new pump, they don't make the beast, and thus not needed. The NAA introduced the 1-3/8" PTO shaft as OEM standard issue and the size still used today. The shaft is a tad longer than the original 1-1/8" shaft and thus the PTO cap will hit. That is where the square cap comes into play. Like I said, the 1-1/8 shaft is no longer made. DEARBORN made an adaptor too -see PIC. Also stated, get a sleeve or ORC adaptor if you need to run a mower, combine, or spreader. How may actually use their belt pulley? A Cordwood saw maybe? If it ain't broke??? I'd move on to better things to send time and money on like PM. Don't sweat he petty stuff and don't pet the sweaty stuff... ; > )

DEARBORN PTO ADAPTOR:



Tim Daley(MI)

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Tim PloughNman Daley

06-25-2020 04:19:14




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 Re: 1 1/8'' vs 1 3/8 in reply to JustBill, 06-24-2020 18:11:45  
In 1950 the ASAE (American Society of Agricultural Engineers)introduced the larger 1-3/8" diameter spline PTO shaft and has been the industry standard ever since. They don't make or sell the old 1-1/8" PTO shaft anymore. There are low cost solutions to use if you have the OEM PTO shaft. The cheapest is a simple sleeve that slips over the shaft and pins with a roll pin -see pic. For a few bucks more but a lot cheaper than replacing the entire PTO shaft is an ORC (Over Running Coupler) that attaches to old PTO 1-1/8" shaft and has the 1-3/8 shaft for use.

PTO ADAPTOR SLEEVE:


Tim Daley(MI)

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HarryVanderpool

06-24-2020 20:33:22




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 Re: 1 1/8'''''''''''''''' vs 1 3/8" in reply to JustBill, 06-24-2020 18:11:45  
Quoting Removed, click Modern View to see

Right. And there are a number of cheap adapters that you can install that allow you to attach 1 3 /8 " if need be.
Some of them, however require you to shorten your PTO driveline due to their length.

Replacing the PTO shaft on your N is VERY easy and inexpensive.

Then you're set to run modern implements.

I get it. I am one that likes to keep things stock.

This is one exception.

Just my $0.02....

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JustBill

06-24-2020 19:17:08




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 Re: 1 1/8'''''''' vs 1 3/8" PTO shafts in reply to JustBill, 06-24-2020 18:11:45  
So If I don't have, or plan to have a 1 3/8" implement it won't make any difference, right?



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Shaun Wallace

06-24-2020 19:06:13




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 Re: 1 1/8'' vs 1 3/8 in reply to JustBill, 06-24-2020 18:11:45  
All that changes is the bearing retainer and the output size. The spline end that goes thru pump and shifter stays the same.



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Clifford B.

06-24-2020 18:55:28




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 Re: 1 1/8'''' vs 1 3/8" PTO shafts in reply to JustBill, 06-24-2020 18:11:45  
All the modern PTO driven implements are 1 3/8" drive.....



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