Post hole auger size

   / Post hole auger size #11  
It's not the 24" bit that I am interested in, It's the auger attachment. It just comes with the auger. I was just looking for some guideline as to what size bit my tractor could handle in clay soil. I need to drill some holes to accept 8" sono tube

Then I'd say you'll need a 12" auger. Be sure to check on the auger type/brand before buying to see if replacements are available. If it's a common one, you should be able to sell the 24" auger to recoup some of your cost too.
 
   / Post hole auger size #12  
I ran a 12" on my L3200 3pt without to much problem. Most PTO PHDs are rated to 12 or 14" tops. Some bigger Cat2 3pt PHDs are rated for bigger, but wouldn't fit a L.

My L4060 has a 10gpm flow tops, a bit more than my old L3200 & your L2501. The hydraulic PHDs I could find for that GPM rating at our 2,500psi topped out at the same 12-14" auger size.

10gpm at 2,500psi is about 14hp. So actually my new hydraulic PHD is around 35% weaker than my old 3pt one running on my PTO. The downpressure from the loader, reverse & easy hookup makes it worth it. I wouldn't try to spin much bigger. The 12" is all I can spin frequently in our hard clay. We dont really have rocks to contend with in our neighborhood.
 
 

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