273 shear bolt issue

MoMike

Member
I have a random shear bolt break on my baler. Last cutting about 30 bale in the shearbolt snapped, replaced it and finished the cutting without another break, this week baled again, made it to the last 50 or so bales and broke another one. Hay wasn't heavy, baler wasn't being pushed hard. I do have about 1/8" gap between the flywheel and the front half of the shearbolt holder when the bolts broken. Wondering if I've got to much play in the flywheel. I have changed the shearbolt bushing in the flywheel about 2 years ago when I bought the baler.
Any ideas? Thanks
 
When you replace the sehar bolt do you get it good and tight and does it stay tight?? I noticed I need to tight the one on my NH271 before I bale with it again.
 
My 282 baler used to do that, "wear out" shear bolts. I changed bushing in flywheel but there was slso slop in the drive arm the bolt goes throu. No bushing there and NLA from NH. Mine would go a bit longer than yours. If the center bushing in flywheel is worn it will also cause it to wear out shear bolts. I think they loosten up, then break. Another thing that helped me was to shim flywheel on front side.
 
You cannot have that gap in there. Tighten it up with lock nut. If it doesn't stay tight use longer bolt and double nut. Also you must run pto at 540. Lots of folk think that is to fast. But that can be a shear bolt problem if running to slow. They are made to run at 540. I run mine a little faster yet. Bale thousands of bales without shearing.
 
Check to see if the plunger safety stop is all of the way out of the chamber. The knotter might be timed one tooth too late or the linkage going to the plunger stop might be sloppy enough it does not pull the stop all of the way out of the chamber. My old New Holland was randomly shearing pins. Advancing the timing chain one tooth solved the problem.
 
Had a broken/cracked knife on mine.

It would hang up every now and again and take out the shear bolt.

Sometimes it would be fine for hundreds of bales, so it took a while to find the problem.
 

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