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  1. #1
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    Default How to hand test a NH268 knotter

    Newbie with a very long few weeks learning.

    Somewhere along the first use, I Broke the knotter shear bolt, which busted a needle due to defective interlock. It is now all put back together. Spent the last two weeks going thru the manuals, I have completed knotter timing & alignments on both sides. Needle safety latch also repaired.

    My question- how do you hand test the knotter with real twine loaded??

    I have tried several ways and find results mixed. If you pull out a bales worth of string and tie it off.... The twine gets far too tight and shears the knotter bolt again.

    If you pull out a bales worth of string and let lay loose you get slack and cross wraps and it will jam and shear the knotter or leave a mess...Or on occasion even tie a knot.

    If you pull out a bales worth of string and then use a bungee cord to strap down in the chute you get the best results.... But I get also get knots that hang/stay on the bill hook tongue. But I did get multiple knots to tie and fall off too. Yea!

    So.... Is it time to fire this baby up and feed hay? I understand that is what really counts. But if I shear and bust stuff again I will be really upset.

    Couple items for anyone interested

    I have the 268 baler manual in PDF form and the NHL knotter guide as a PDF. Willing to upload them here if I can find a files area.
    This video was a big help in understanding how this all works
    New holland official knotter video: Small Square Baler Knotter - YouTube

    Thank you for taking the time to read and if possible : posting some help.
    Last edited by countryguy1225; 10-25-2012 at 08:25 PM.

  2. #2
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    Default Re: How to hand test a NH268 knotter

    I have a NH 310 ... Found that empty, the knotters aren't under load so they won't tie a knot.

    I would check the timing of needles, plunger etc, and make sure the needle interlock is timed too. Then, feed it some hay...

  3. #3
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    Default Re: How to hand test a NH268 knotter

    What was wrong with the interlock? That would be the next thing I'd make sure was working before you start the baler up. I too have a NH 268 and have found the only reliable way to test the knotters is to actually put hay through it.
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  4. #4
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    Default Re: How to hand test a NH268 knotter

    Thanks for the notes- The Interlock bolts were severly bent and the steel block (on rubber mount) was bent too far out to really HALT and shear the flywheel bolt. So it "skipped" off to the side and broke 1 of the needles it seems.

    I've replaced the entire ASSY of bolts and insured it works w/ a hand test when I had needles in and removed the knotter bolt.

    So.... As you said- I think it's time to run on low speed, put the PTO into the mix and see. I do have a question on PLUNGER location when the needles a just about to enter.... But will open a thread on this.

    My Q on plunger timing- - As my needles are just about to enter the bottom, I see that the front plunger steel ribs are several inches out front of the needle slots. The lower main frame is around an inch. The Manual shows a diagram of 1/4" to 3/4" for the plunger to needle locations but fails to show if those ribs are part of the test. I'll review the NH baler knotter video agan too. What do you think?

  5. #5
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    Default Re: How to hand test a NH268 knotter

    -needletiming1-jpg
    OK... Back to the Manuals. As yesterday was the knotters- Next is the plunger timing (which I glanced upon). So that said, Attached is the NH Manual guide text which clearly states that you should be 1/4 to 3/4 of the front projections. so NEXT... ;-) Never a dull moment! I did attach the NH diagram and text if anyone is interested. I'd post the entire manual if the 1mb limits were lifted.... hinthint.

  6. #6
    Elite Member Tx Jim's Avatar
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    Default Re: How to hand test a NH268 knotter

    OK I give up what's an interlock??? I've been around/used/worked on sq balers for 40+ years and don't have a clue what an interlock is!!!!!!!!

  7. #7
    Elite Member JasG's Avatar
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    Default Re: How to hand test a NH268 knotter

    Quote Originally Posted by Tx Jim View Post
    OK I give up what's an interlock??? I've been around/used/worked on sq balers for 40+ years and don't have a clue what an interlock is!!!!!!!!
    The only thing I can think that would fail and allow a needle to be broken would be the plunger stop. This would be the device that sticks out if the pluger is not in the right place (too far away) with the needles in the chamber. This would stop the plunger and shear the flywheel bolt.

    I'm just guessing on the information given.
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  8. #8
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    Default Re: How to hand test a NH268 knotter

    Quote Originally Posted by JasG View Post
    The only thing I can think that would fail and allow a needle to be broken would be the plunger stop. This would be the device that sticks out if the pluger is not in the right place (too far away) with the needles in the chamber. This would stop the plunger and shear the flywheel bolt.

    I'm just guessing on the information given.
    This is it, I was using the wrong terminology. As per New Holland it is referred to as the "Needle Safety Latch". On these old NH balers it is a simple and obvious apparatus. I would assume our JD 337 baler has a similar function, but I haven't had to deal with it.
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  9. #9
    Elite Member zzvyb6's Avatar
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    Default Re: How to hand test a NH268 knotter

    Jeff: If the plunger has jumped out of time relative to the knotter drive engagement, then you risk engaging a needle. BUT, the plunger stop knows when the needles are up in the bale chamber. If its working correctly, the stop will lock out the plunger entry and you will/should be breaking the main shear pin. Since the needle lift link separated, this lockout was defeated. That's why I NEVER put a shear pin in my needle lift link. Its intended to break if you try to bale a tree limb or a big rock, but its the needle retraction that I ALWYS want.

    As for position of the plunger when the knotter trips, on my baler, the plunger is well on its way out of the compaction area when the needles raise. Some people think that the needles ought to help push the final flake at the bale being formed, but it ain't supposed to be. That's what the hay resistors are for. Yes, there are slots in the plunger to allow some uncertainty in this position but it lowers the probability of needle survivability.

    The bale forming and knot tying process ought to work properly at tractor idle speed with some small amount of hay in the case and with a tight bale in the chute. This is because (as you will often find out) the trip arm drops by itself after some stoppage and then you roll it over to begin another windrow when the tractor and pto are still just off idle.

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  10. #10
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    Default Re: How to hand test a NH268 knotter

    Countryguy ... I may not have made it clear in the first post. You MUST make sure ALL timing is correct before running it under power. When you say the needles are entering the bale chamber several inches behind the tip of the plunger .. It means to me , the machine is completely out of time.

    You have a manual... Check the needle penetration, needle drive timing, needle latch. (Needle latch is what you are calling the interlock) etc... There are several inter-related timing adjustments. Change one and another is mis-timed .... too many to write about here . A mis-timed baler is expensive parts broken... much less well tied bales.

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