Posthole Digger my new post hole digger

   / my new post hole digger #11  
There is one thing wrong with it.... it's not on my tractor!

nice, nice...
 
   / my new post hole digger #12  
I sort of ran down the Lienbach 7400 PHD after I bought mine. With around 45 hp PTO, I kept breaking shear bolts. I put in a grade 5 and then twisted the 12" auger in half. /forums/images/graemlins/shocked.gif

I've since put in a slip clutch and got me a couple of new augers. Now, I have to brag that it is a pretty darn good auger for the price. I paid $375 for the new PHD with a 12" auger. I've now drilled over 5000 holes with it, and it's still going strong. Have at it!!
 
   / my new post hole digger #13  
5000 holes, your place must look like swiss cheese.... /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif
 
   / my new post hole digger
  • Thread Starter
#14  
<font color="blue"> With around 45 hp PTO, I kept breaking shear bolts. </font>

That leads to a story that could be funny if it wasn't so embarrasing. I've never used a tractor-mounted PHD before. Heck, I've never even seen a tractor-mounted PHD before, except in pictures. So, I tried my first hole. I gently lowered the boom until the tip of the auger was positioned where I wanted it. Then, I engaged the PTO. Next, I lowered the control lever for the 3PH. I didn't let it go down really fast, but I didn't make it slow, either.

Well, the auger screwed itself right down into the ground in about a lickety-split, and quit. Almost stalled the tractor -- I had to throw in the clutch Real Fast to keep it running. I let the clutch out a little -- almost stalled. The auger would turn about 1/4 revolution and stop.

My 15 PTO horsepower just wasn't enough to even think about breaking the shear pin, let alone hurt the auger. It wasn't powerful enough to keep the auger spinning, even in our soft sand.

Now what to do? That thing was screwed in there! The 3PH hydraulics weren't strong enough to pull it up, and the horsepower was enough to get it spinning and break it free.

I resorted to gently rocking back and forth, making the hole larger in at least 2 directions. Finally, I wiggled it enough that it wasn't trapped by it's own threads any longer. I engaged the PTO again, and this time it spun, and I could lift it.

I've learned to take smaller bites. Let the auger down in the hole a little, let it spin, pull it up to free the dirt, and next time go a little deeper, and keep repeating until I geet it as deep as I want it. As long as I keep scouring the hole with the up-and-down motion, it does a great job.

At least I know I'll never break a shear pin... /forums/images/graemlins/crazy.gif
 
   / my new post hole digger #15  
I bought the Leinbach L 7200 JR post hole digger with the 12" auger. I have used it on my b7100 I have only drilled about 10 holes. The tractor is something like 16 hp. I have stalled the tractor drilling holes and broke about 8 grade 2 shear bolts. I raised up the rpm's some to get more power to the pto. My soil has clay and rocks and shale. sometimes when I tried to drill holes the auger spun around the ground in a 2' circle before it dug in. the angle is pretty steep for the top u joint that connects into the gear box. I think it is a good unit for the money David.
 
   / my new post hole digger #16  
Don

I have the same PHD and have the same height problem on my B7800. Nice fix. I'll be welding on some longer tabs in the near future.
I'm still trying to figure out 3pt hitch geometry, I tried moving the bolt at the top of the boom, but the only result was a sore back /forums/images/graemlins/confused.gif

Did you have to change the length of the pto shaft?

Lou
 
 
 
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