New B2601 with loader down low empty bucket  and mower going. I think putting it in 4WD is the answer. Not sure if it was in 2 or 4wd.
		
		
	 
I have some pretty steep hillsides on my property.  I mow and move material in these areas with both my B2601 and L2501.
My B2601 has loaded tires and 2” Bora steel spacers (which I highly recommend).
The loader on my B2601 is “always” off when I mow.  It increases the stability of the tractor when navigating hillsides.  On hills, I’m always in 4WD and some of my hills require L gear as they are quite steep. Keep the tractor in 4WD on the hills.
I may have had a similar situation in my B2601 recently.  I was traveling down one of the tall steep hillsides in M with an empty bucket but, in 2WD by accident.  I released the HST pedal to slow my travel and the rear tires seemed to skip, lock-up and slide a bit.  Totally strange.  I quickly got back on the HST and increases speed a bit and all was well.
I had been running the L2501 up and down the hill all day and the two tractors behave differently.  I just need to remember which machine I’m on.
Mike