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Implement Alley Discussion Forum

What is a pitman arm?

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Larry in Wiscon

06-10-2005 13:44:29




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I was going to look at a pull type sickle bar mower, when the person on the phone said it was missing the pitman arm. What is it and is it replaceable? Thanks for your time.




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Dave H (MI)

06-10-2005 19:38:16




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 Re: What is a pitman arm? in reply to Larry in Wisconsin, 06-10-2005 13:44:29  
Lots of old machines and probably some new ones have pitmans. Like the others said but derived from the old pit saws, I believe, where one fella had to stand in the pit and pull the saw down. That would be the pit man.



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j cook (iowa)

06-11-2005 14:59:42




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 Re: What is a pitman arm? in reply to Dave H (MI), 06-10-2005 19:38:16  
Think of a "Pitman" arm as being a wooden connecting rod. it is usually fastened to a flywheel on one end, and is atttached via a ball joint to the sickle bar at the other. It is what converts the rotary motion of the tractor pto to the back and forth action of the sicklebar. Those things are a reverse of whay the piston in your engine does! They are made of wood so that they can shatter easily if there is an obstruction and so that more expensive parts of the machine don't break instead. They are strong enough to do the job, however. Many mowing machines also have slip clutch protection.

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Unimog

06-10-2005 14:15:13




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 Re: What is a pitman arm? in reply to Larry in Wisconsin, 06-10-2005 13:44:29  
The pitman arm is the wooden drive that moves the sickle cutter. It acts as a fuse or shear point
if you catch something that doesn't cut. It breaks
and you buy or make a replacement from hardwood
like oak or maple. The pitman arm has some type
of metal clamps or attaching points at each end
of the stick. These are what you need. Ask if
they are there and just the stick is missing or
broken.

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Jerry D in NC

06-10-2005 15:43:30




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 Re: What is a pitman arm? in reply to Unimog, 06-10-2005 14:15:13  
Jerry,

Some how I have deleted the address you sent me and your email address. Would you resend???



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Fighting suburbia in NC

06-10-2005 14:06:10




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 Re: What is a pitman arm? in reply to Larry in Wisconsin, 06-10-2005 13:44:29  
It is the (usually) wooden arm that connects the sliding toothed part of the sickle bar to the wobble box/drive pulley. They are the weak link in the drive system and are supposed to break before anything else gets bent/destroyed.

They are available from Tractor Supply, Agri-Supply, or most farm stores and you need to know the make/model of the sickle bar to get the right one. The best thing is to take the broken/rotten/whatever is left pieces down to the store and match them up.

Some guys will make their own but, once you get used to the equipment, you will not be near as prone to breaking one.

Might want to get two or three now because you will break one eventually.

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