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Re: JD 1209 Mower Knife Drive Arm

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Author  [Modern View]

07-23-2013 14:30:30

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The new style pitman arm is an update on the older style. The newer 720 series haybines use the same setup. If you're certain the knife moves freely back and forth check your guards for excessive wear that will allow the knives to move up and down against the shearbar surfaces of the guard. Don't be afraid to spend the money on new knives and guards. Everything sharp and without excessive wear will make a big difference. No-clog guards work great plus there's the advantage that they are adjustable to take up slack as they wear.

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08-06-2013 12:01:23

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 Re: JD 1209 Mower Knife Drive Arm in reply to JohnS1970, 07-23-2013 14:30:30  
Thanks to everyone for their input. I think I finally have it licked. I bought new guards and a new pitman arm. As I was changing the guards I noticed that the older ones were not bent, but that the main frame where the guards are bolted was slightly bent up just in the middle, about a 2 foot section. I noticed this after I removed several bent-looking guards and moved the knife to and fro to check. I watched the sections getting pushed (tilted) upwards as they passed through the guards. When I put new guards on, it did the same. So the whole problem came down to the knife assembly twisting up then down as it passed through, causing the metal fatigue and eventually the wear in the pitman arm Pin hole. To correct it, I placed shims of various thicknesses just in front of the carriage bolt at the bottom of the guards that needed to be lowered. I also replaced the pitman arm. Now, after running it for a day I do not see any wear in the bolt that holds the pin in the pitman. I still have some chatter when its running so I'll adjust the guards to lessen the noise as it must still be catching a guard or two somewhere.

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