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Breaking shear bolts....MF 124 baler

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Jim.UT

08-06-2002 21:08:15




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I was having knotter problems earlier this year. I've been twiddling with the knotters ever since. While I had it apart, I cleaned out the bale chamber and then tried to get the bale tension adjusters back to where they were. Now I'm breaking shear bolts frequently. Is that a sign of the bale tension being too tight? The baler is not clogging up otherwise, but the bales seem a little heavy to me.

Meanwhile, the knotters are still not tying consistently, but I'll leave that question for after I have a chance to read the manual again.

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Heat Houser

08-07-2002 19:45:49




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 Re: Breaking shear bolts....MF 124 baler in reply to Jim.UT, 08-06-2002 21:08:15  
Fiddled with the knotters? Are you sure your needles are in "time" with the plunger? If the needles enter the bale chamber too soon, the plunger stop will be up and stop the plunger from baling up your needles. It does this feat by shearing the pin.
Not making a knot?
Your needles need to come very close (actually just miss) to the twine discs in the knotters or the disc will not capture the twine and the bill hook wont be able to form the knot. This was good for a whole weekend of fun for me. Finally noticed it late on a Sunday night.

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pappy

08-07-2002 14:12:12




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 Re: Breaking shear bolts....MF 124 baler in reply to Jim.UT, 08-06-2002 21:08:15  
our mf 12 baler was shearing pins and it was the fly wheel bushing that was the problem. someone had been using the wrong shear pin that didn't fit the hole. mf pins are thicker in the barrel of the bolt than a standard bolt. we replaced the bushing and got the right pin and no more problems.when your pin shears does it sound like it hit something hard? then you need to check the safty locks. good luck-- pappy

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dave(ne)

08-07-2002 07:18:32




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 Re: Breaking shear bolts....MF 124 baler in reply to Jim.UT, 08-06-2002 21:08:15  
Could be the flywheel bushing is bad. On NH balers if the bushing is worn out it will break shear bolts. Been there done that.



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Garry

08-06-2002 23:19:51




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 Re: Breaking shear bolts....MF 124 baler in reply to Jim.UT, 08-06-2002 21:08:15  
From my experience:

Number 1 - check all areas of your timing. If the knotters are held in time with with a smaller shear pin/bolt, check to make sure it is good, and tight, and not allowing any back & forth slack, (have fought this one on my 273...depending on where the slack started/stopped, would work a couple of bales and then shear the main. Learned a lot about the baler while trying to win that one!)

Number 2 - Don't know about your MF124, but my NH273 will definately shear the pin if the tension is so tight that the plunger can't bump/push the bale back a little on each stroke. If you have bale wedges in the back end of the bale chamber, they will help magnify the constriction also.

Number 3 - Maybe a little too high a moisture in material being baled and dragging extra heavy through the process??

Number 4 - combination of 2 &/or 3 and maybe a dull knife edge, weakening the shear pin a little at a time till it snaps??

Hard to 'guess' where to set the tensioners on an empty baler without some previous made "mark" or "measurement" when the baler was full and making a good bale. If you don't have any reference to set to -- back the tensioners off to where you know for sure they will be loose, then 'sacrifice' a few bales (that you can remove the twine from and rebale later) by running a bale through the knotting cycle and adjust little by little (maybe 4-5 turns tighter if really loose, or maybe only 1 -2 turns at a time if getting close) should be able to get a 'keeper' bale by the 3rd, 4th, or maybe 5th bale out, then fine tune as you go. Cut the strings on the loose ones (kick the pats apart a little) and rebale on the next time around. When you get it set like you want it, do some marking or measuring/note taking so will have a close starting point for the next time you start with an empty baler.

Inconsistant knot tying is a challenge!

After confirmation that all components are good and tensions set right (or close to right, if you don't have one of those scales that they show in the pictures!) Top 2 things I would check first:

1. Blow/remove all the dust and debri to make sure nothing is binding up (esp the twine fingers, if like on the 273, they set at the bottom of the assembly on a more/less solid plate that catches all the dust/dirt/chaff/etc..)

2. Twine, don't know about poly, but sisal - ain't all created equal. Had some last year wasn't even equal to itself.....diameter wasn't consistent. Couldn't get more than 10 bales at a time that one side or the other wouldn't tie. Fought through 70 - 80 bales before I noticed it. Changed the twine out and got back to the usual of only a couple of misses per 100 or better.

With older, used balers that have a glitch -- Just when you think ya got it figured out.....It starts raining!!

Good luck

Garry

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