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NH 78 baler

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Mike

06-24-2001 03:01:43




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I have a nh78 baler, when the knotter is tripped it ties the bale ok however, it doesn't seem to push the needle arm far enough back. Thereafter, everytime the clutch comes around it tries to push the arm and needles back into place and it pulsates, sometimes it allows the safety wedge that protects the needles to go into the chamber and sheer the flywheel bolt, I've been working on it for a while but can't seem to locate the problem. I've replaced the disc on the brake, no change. Any help would be appreciated.

Mike

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smirkey

06-25-2001 08:37:58




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 Re: NH 78 baler in reply to Mike, 06-24-2001 03:01:43  
i think the crank arm is not going far enough around to the home position. i believe there is an adjustment on the trip arm of a 78. this is covered in the manual by the way. trip the knotter and have someone turn flywheel forward by hand through the tying cycle. watch from the side the trip pawl come around and hit the stop on the trip arm. there is a small 5/16 bolt there with a slot to adjust the stop (it can be adjusted front-back and also up-down. i think you want to delay (move stop rearward) so the crank comes further around before hitting the stop. as i recall you stretch a string or twine from the center of the knotter shaft to the center of the needle yolk pin to see if the drag arm is positioned correctly. (a picture of this is in the book i think.)

I think what is happening is the clutch is disengaged too early and each rev of the knotter it comes partially engaged. oh also chech that the small spring is there to pull the two cast iron tabs together in the clutch mechanism. it may be missing!

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Davidj

06-25-2001 05:10:46




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 Re: NH 78 baler in reply to Mike, 06-24-2001 03:01:43  
Try to adjust the safety wedge(plunger stop). Pull it back as far as it will go and see what it does during a tying cycle. I just got a 269 and had to do that as the timing was dead on but with a streched knotter drive chain, the needles weren't as far back as they should have been so the plunger stop would still be in place and BANG. So making the safety act sooner would help if it pulls the stop out sooner then your needles will have more room to manouver without defeating its purpose. Best of luck. P.s. had to do this on my nh65 too and it worked well too.

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Fudd

06-24-2001 20:43:35




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 Re: NH 78 baler in reply to Mike, 06-24-2001 03:01:43  
I have a JD 14t that did something like that. The knotters have a spring loaded roller that falls into a notch that keeps the knotter in the home position. This roller had fallen off and the knotter would drift out of the home position, the needles would move a little and the plunger stop would come up and stop the plunger. The first time this happened I thought I had baled up a rock and I didn't know if I wanted to clean out the hay and look or not. Hope this helps. Good luck.

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Dan

06-24-2001 11:15:32




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 Re: NH 78 baler in reply to Mike, 06-24-2001 03:01:43  
If the needles do not go to the home position you might need to adjust the needle lift arm. also as mentioned , check the timing. The timing should be set so the needles enter the bale case about 3/4 inch BEHIND the tip of the plunger extension. You can check the needle lift arm by seeing how far up the needles come past the knotter discs. If you have an operator's manual it shoud go through the procedure. Usually if the needles are dropping down when not supposed to it is the fault of the brake.

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Mike

06-24-2001 19:58:31




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 Re: Re: NH 78 baler in reply to Dan, 06-24-2001 11:15:32  
The timing is correct, I've checked it over and over, have manual, just not pushing the needle arm far enough, then each time the clutch comes around it tries to push into place a bit further, and it slips back right at the threshold, if I pull the needles by hand while it is pulsating and the arm is lined up, it stays in place without pulsating until the next tying cycle. Is there an adjustment for this? Replaced discs already and tried different tensions on the brake.
Had to tie a rubber strap to hold the needles back slightly to make it work. I'm sure I must be overlooking something. Help Please!

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JIM

06-24-2001 10:39:27




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 Re: NH 78 baler in reply to Mike, 06-24-2001 03:01:43  
I THINK IT IS OUT OF TIME NEEDS TO BE RESET THATS ALL I KNOW . GOOD LUCK



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