Brush hog stump jumper/blade carrier mod for bolts.

[TDMLLC]

I'm a machinist, and a guy brought me a stump jumper off of what I think is a JCT brush cutter for a skid steer. It uses smaller bolts with castle nuts, and I assume just loosening up any amount makes the hole and bolt go to crap. He wants some custom bolts to mount common blades he can get at Tractor Supply. My thoughts are to just bore out thr holes in the carrier plate to accept common brush hot bolts he can get there as well. My question is, does the 'key' or 'spline' on the bolt need a keyway in the hole, or is it intended to be an interference fit? Thanks!

For reference I think it's the same issue this guy on YouTube had.

 

[Dman1981]

On the bigger bushhogs bat wings the new pans come with a weldable
Hex sleeve for blades
Part number 50076706 sleeve
Bolt kit is 50076475
Bush hog part numbers

 

[Brown Dog]

The pinched shoulder on the Bush Hog blade bolts are to keep it from turning when tightening or loosening the hex nut.

My Befco mower had the same design as JCT & was doo doo imo because bolt would spin & wollar the shoulder on bolt & the hole out in stump jumper .

 

[Dman1981]

The pinched shoulder on the Bush Hog blade bolts are to keep it from turning when tightening or loosening the hex nut.

My Befco mower had the same design as JCT & was doo doo imo because bolt would spin & wollar the shoulder on bolt & the hole out in stump jumper .

I agree with you were ****
But the hex heads seemed to work really well three seasons just had welds break on one
Just welded it back in

 

[Brown Dog]

But without the pinch when the bolt gets the least bit loose : the bolt spins.

A bolt with the pinch can’t spin at all : tight OR loose.

 

[Dman1981]

Weld in hex assembly for mower blades

 

[TractorTech]

For the OPs question, they are keyed into place, but agree, a square or hex hole is the way to go.

 

[Brown Dog]

Very good ideas

Dman I now see what you’re saying about the Hex SHOULDER that you weld in the stump jumper & totally agree.

My Bush Hog 2815 has pinched blade bolts but I like the Hex Shoulder Bolts much better on my JD MX10