I'm looking at augers and Danuser is the only one I've come across that offers auger bits for different types of soils. That makes sense to me. Does it?
My tractor is a 25.5 hp Kubota
B2601, so compact. Our soil here is tight clay full of shale. I mean all sizes of shale, which is from compressed clay, and then there are shale shelfs. Now nothing I can use will go through a shelf of rock. But I need something to deal with small, medium, and big rocks. Realistically I guess it would wallow them out. Trying to dig footings here, you are not going to have a nice straight trench.
My past experience was with an old PHD and a 33 hp JD970. It did great but our soil was not rocky. I also had a post pounder that worked well.
Here are the choices for Danuser's 20/40 PHD from their web site:
Plain Edge
For digging in dirt, clay, sod, and other light-duty conditions.
Features:
Available in 40”, 52”, and 72” lengths for PTO diggers, and Models 8300, 8800, and 8900 hydraulic drives.
(click to see available auger bits)
Serrated Edge
For digging in compact soils, light tree roots, and dry soil.
Features:
Available in 40”, 52”, and 72” lengths for PTO diggers, and Models 8300, 8800, and 8900 hydraulic drives.
(click to see available auger bits)
Hole Digger Head
For digging in clay, caliche, shale, mixed limestone, frozen ground, and light rock. The most aggressive design offered.
Features:
Available in 40”, 52”, and 72” lengths for PTO diggers, and Models 8300, 8800, and 8900 hydraulic drives.
(click to see available auger bits)
Stepped (plain and serrated edges)
Stepped tree planting auger for bulb type trees.
Features:
Available in 33” and 40” lengths for PTO diggers, and Models 8300, 8800, and 8900 hydraulic drives.