Safety arm securely positions posts in the driving ram. For use with pd8, pd10 or pd12 shaver post drivers. Post Drivers Tractor Idea Tractor Implements Tractor Accessories Used this summer to put up my fence for my livestock all done and no longer need. Shaver post driver hd8 . Using a shaver hd8 hydraulic post driver to drive 4x6x8 pt lumber for the start of my fencing. Shaver post drivers can be mounted on a tractor or skid steer loader and are powered hydraulically. This tractor mounted post driver delivers 100,000 lbs of pressure on it's full down stroke! The shaver hydraulic post driver. An important requirement for a shaver hookup is a direct (zero pressure) return for the oil from the post driver's valve to the tractor's hyd reservoir (rear end housing). For use with hd10 or hpd20 post driver. The operator has complete control. I had remotes installed, and everything worked great today on the post drivers maiden voyage with the exception of h...