Loader 3320 Dual Selector Control linkage problem

[OrangeJbird]

Blowing snow this evening and the SCV lever suddenly wouldn't move the SB59 blower chute to the right.(loader dump)
The lever moved really easy like the linkage let loose. It would move the chute left (loader bucket curl)
I believe something let loose in the linkage. Do I need to remove the fender to get at the linkage? Or can I get at everything without removing the fender?
Thanks for looking.

[OrangeJbird]

I've determined that I need to remove the black operator station cover to get at the linkage. How do I get the orange cover off the range lever to remove the knob and can I unscrew the rate of drop knob or does it need to be removed differently?