The auger circuit is the PTO hyd on the Power-Trac, and only tuns the hyd motor in one direction.
If you look at the hyd shaft, the hyd motor probably turns in a counter clockwise direction. If you look down at the auger turning, it is turning clockwise.
The way to reverse the auger is to switch the hoses around.
You could add another hyd valve and make it fwd and rev flow.
If your auger is turning counter clockwise look down at the hose, it would not dig even a foot as it would just be wiping the ground.
If your auger is turning the wrong way, just reverse the hyd motor hoses.
On the hoses from the hyd motor, do you have the same QD's, or do you have a male and a female QD?
If you have a male and a female QD, then you need to have the motor ports setup to run the correct direction.
Just switch things around until the auger is turning the correct direction.