Toro dingo pulls to one side

[Spscenna]

Hello, guys and maybe gals. I was hoping someone might help me with a problem I am having with my toro dingo. It is a 2004 model and when I drive it in forward it pulls to the left and quite often my ding bogs bogs down on me. It runs fine in reverse but not forward. Also I have been losing the knobs on the underside of my tracts but the top side looks pretty good. Still has a lot of tread.
Thanks for any help.

 

[FlyingDutchman]

The control linkage may be damaged or a valve in the hydro is opening. Typically if the hydro is trashed internally both fwd and reverse are bad. If one direction, you may get lucky with an external fix like a relief valve stuck open.