Rotary Cutter cause of 3pt stabilizer sheared bolt

[scott alaniz]

Hi guys,

I'm looking for some help and answers as to the reason(s) I am shearing off bolts on my 3pt lift stabilizer arms. It may just be operator error, but I'd like the wisdom of folks more knowledgeable than me.

Background: I've got a NH Boomer 50 that I've been using with a 6 Ag-Meier Rotary Cutter. The bolt isn't shearing when I'm mowing on what little flat, smooth ground I have on my property. I'm sure to make slow wide turns and am operating in lower gear. No issues there. We do have old fields, ruts and rocks. In fairness, I have backed up with it in some tight, uneven spaces.

Is it possible that the brush hog height is set incorrectly and would cause the shearing, or that the rear wheel is hooking on rocks, etc? I don't know if the shearing would be caused by pushing, pulling, traveling thru low spots or side pressure. Or, maybe the Brush hog is too big for the tractor?

I've attached a photo of where the stabilizer arm is bolted to the tractor. Appreciate your thoughts.

Thanks,

Scott

 

[CalG]

delete

.......

 

[CalG]

You have the stabilizers too short. Likely because you have adjusted them when there is some extra slop in the motion. Then , when the lift is actuated, all the slop is taken up, and then some. POP! There goes the fasteners.

Slack up!

Either that or you are turning and hitting the cutter into something solid.

 

[ruffdog]

It looks like there is little support behind the bracket to support the lower portion from being pushed toward the front. It looks like it would be supported better if the stabilizers were shorted, not lengthened when set up. (keep the stabilizer pulling, not pushing)

 

[WranglerX]

Could stabilizer mount be upside down (and or switched side to side) like if pivot point of bracket was against upper portion of axle it would not have leverage to pop bolt head off....

A 10.9 metric bolt is a 151,000 psi strength in shear, got to be some real forces at work here....

What is bolt diameter, are you over torquing it when tightening it and actually damaging it before it ever gets out of shop.... If it's a 12mm it only torques to 109ft-lbs (dry) and 10mm is 62ft-lbs...

IF you decide of flip bracket over, I would recommend using all new bolting hardware, the existing one's may be stressed and ready to fail...

Dale

 

[ruffdog]

The stabilizer pivot needs to be in the same plane (inline) with the 3pt lift arm pivot.

 

[WranglerX]

The stabilizer pivot needs to be in the same plane (inline) with the 3pt lift arm pivot.

Ok... I see.... My stabilizer uses chains and not rigid arms...

But obviously there is an alignment issue here ....

Dale

 

[Jkott]

What is all the gouging in the upper right of the bracket and the pto housing? Is something hitting that?

 

[newbury]

We need pictures of the entire setup. A picture or two from the side showing from the PTO spline to past the MISSING PTO SHIELD on the mower.

 

[scott alaniz]

Thanks for the rapid responses. I’ll get more pics posted as soon as I can get back out to the property.