BX23 only moves forward in 4wd

[Cbeam]

I have a 1st gen BX23. While mowing with a 3pt mower, the forward movement quit. It will go reverse in 2wd and forward in 4wd. But NOT forward in 2wd. Linkage looks good as far as I can tell. I've had the tractor about 4 years and am very familiar with shifting, etc.

Any thoughts to the mechanics out there?

 

[North Idaho Wolfman]

Check the Rear tire pressure.
It's very common to spin the tires in the rims.

 

[Cbeam]

I jacked up the rear tires and they do not move when the foot pedal is depressed in 2wd.

 

[Scm]

I jacked up the rear tires and they do not move when the foot pedal is depressed in 2wd.

Do they spin in 4WD when jacked up?