OT - Pitman arm jumping off sickle bar mower

Ed S.

Well-known Member
Location
Middle Tennessee
[i:368df64745](Repost from the 8N forum)[/i:368df64745]

It's time to cut hay again, and my New Idea sickle is acting up again. Almost immediately, the pitman arm jumps off the cutting bar head (ball joint). Never done this before... I put a new cutter bar on it at my first cutting, and it was working okay, except it would bind up after 15-20 minutes and I would have to let it cool down. Figured out I need to reshim the guide plates, and now found one bolt is broken off. Drilled it out, and now gotta get a new bolt and chase the threads, too.

Any ideas why the pitman is jumping off? Ya' think fixing the guide plates will solve the pitman problem?

"Nothing breaks 'till you use it."

es
 
Have you checked to make sure that the new bar isn't hitting anything on it's out stroke? If the clamping spring is a little weak, and the bar puts up enough resistance, it can pop off.
 
If it was like my old NI it is designed to do that (protect the pitman). A spring lock mech that would pop loose if the knives bound up. I lost the springy thing that held the two halfs tight.

Other NIs I have seen used a funny looking round disk to hold the two halfs together with pins. Could be it warn?????
 
Mine has the spring clip, all parts still there. My guess is that I'm binding up somewhere and that's enough to pop the pitman head off the ball.

The curious thing is that it wasn't doing this a month ago, and nothing's changed...

es
 
i can't imagine it being out of time, but did you compare the old blade to the new one in length and the spacing on the teeth or width of them
 

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