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Implement Alley Discussion Forum

Pitman

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Tom S. in Tn.

05-06-2005 06:56:23




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Why were pitman arms typically made from wood? Could a replacement for an older model IHC #27 be fabricated from boxed steel or aluminum tubing instead of a stick of hickory?
We are adding approx. 2 1/2" to the overall cutting length of the original 7" bar.
Tom S. in Tn.




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JMS/MN

05-08-2005 20:20:49




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
I assume you think you need a stronger pitman because you are adding length to the cutterbar. Back around 1960, Kosch made a sickle mower with a nine foot cutterbar, compared to the normal seven foot length. The extra length should not add much load, the important thing is to maintain the cutterbar properly, but the wooden pitman is the safety release. Wood is cheaper than steel.



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Randy-IA

05-07-2005 21:21:58




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
Hi , Seems to me that if you are adding length to the cutterbar you don't need a longer pitman if you haven't changed the stroke . All you are doing is adding to the sickle and not moving it out right ? Or did I miss something ? The register should stay the same therefor pitman length should stay the same .



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Ibby

05-07-2005 04:32:50




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
I did that once. I replaced a pitman stick with box tubing. It thru everything so far out of balance that It tore up the wobble arm and bearings, broke the head off the sickle bar and gennerally messed up the mover. Several hundred dollars later, I was back to a wood stick. Best pitman bar insurance is a spare stick. AS long as you have a spare in the shed, you'll likely never need it!



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Ibby

05-07-2005 04:29:47




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
I did that once. I replaced a pitman stick with box tubing. It thru everything so far out of balance that It tore up the wobble arm and bearings, broke the head off the sickle bar and gennerally messed up the mover. Several hundred dollars later, I was back to a wood stick. Best pitman bar insurance is a spare stick. AS long as you have a spare in the shed, you'll likely never need it!



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msb

05-06-2005 19:09:32




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
IF you decide to make your own,keeping the same length is very important or the knife register will be of and the thing won't cut worth a darn.The point of the sections must register with the guard points at the end of each stroke whether it is to the left or the right end of the stroke.



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Jerry D in NC

05-06-2005 11:01:56




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
Just like the fuses in your house, that piece of hickory will save your cutter bar or drive train. The wooden pittman works great and is not a limitation of a mower that is properly set up. It will cut anything it is supposed to cut. A metal bar is like dropping a penny in a fuse



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JMS/MN

05-06-2005 10:59:37




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
They are made of wood for the same reason that slip clutches and shear pins were invented. Cheaper fix than breaking big stuff. If you override, you overload. Then you buy more parts.



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Joel Harman

05-06-2005 10:49:13




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
if you are breaking pittyman sticks then you may need to changfe out ledger plates & knives.



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DavidA

05-06-2005 10:03:49




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
This can and has been done. I would suggest using small Grade 2 or less bolts to connect the pitman at the bearing end. I cannot say for sure what size, grade or the number of bolts needed but you could possibly use this as your new shear point, instead of the rod itself.



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Hayfarmer

05-06-2005 07:26:00




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 Re: Pitman in reply to Tom S. in Tn., 05-06-2005 06:56:23  
If you make the stick out of metal you will eliminate the safety shear effect of the wood stick. If something gets hung up it will give somewhere else,maybe the gearbox.



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Tom S. in Tn.

05-07-2005 14:58:39




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 I get the picture in reply to Hayfarmer, 05-06-2005 07:26:00  
I'll probably go ahead and purchase one of those universal replacements.
Thanx for your info folks.
Tom S.



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Tom S. in Tn.

05-07-2005 14:58:38




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 I get the picture in reply to Hayfarmer, 05-06-2005 07:26:00  
I'll probably go ahead and purchase one of those universal replacements.
Thanx for your info folks.
Tom S.



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Tom S. in Tn.

05-07-2005 14:54:50




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 I get the picture in reply to Hayfarmer, 05-06-2005 07:26:00  
I'll probably go ahead and purchase one of those universal replacements.
Thanx for your info folks.
Tom S.



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