469 haybine question

Charlie M

Well-known Member
I picked up a 469 haybine a couple of years ago that had good rollers but rusted out in the places where those things rust out.Some welding, a change out of the tongue and I now have a machine that cuts real nice. Problem is it will shear the bolt from the wobbler to the knife head about every 3 acres. Would this be a problem with the bushing in the knife head. How should that bushing work - does it turn with the bolt or do something else. Never had one apart before.
 
When my 460 would do that it was the bushing going bad simple as that. They are press fit so one need a press to take them out and to put a new one in
 
Are you using the right grade bolt? Pretty sure it's grade 8 fine thread. Other thing you might check is that when you tighten up the nut ( about 75 ft lbs) the arm should be in the center of its travel, so the rubber in the bushing stretches equally both ways as the arm travels back and forth. Generally not doing this results in premature bushing wear, not busted bolts.
 
When you torque the bolt the drive arm needs to be in the center of its travel. Then the rubber bushing can flex equally as it moves from side to side.
 
I had a 469 that the bushing would burn up about every 15 acres. The problem was the small pivot bearing was bad below the wobble arm. Once that bearing was replaced, it cut smoother and no more bushings burned up. One thing I also did was use a course thread bolt in the knife. I would strip a fine thread out easy. Grade 8 too. Did not matter. That bolt needs to be very tight. Make sure the knives are sharp. Lowers the thrust force.
 

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