Good Morning All. I apologize if this isn't the right board to post this but I have a 2017 UForce 500. I am able to press the red button to go from 2 wheel to 4 wheel drive. That works fine. But the lever that allows differential lock is seized up. I never used it and now it is unmovable.

I tried some oil in the area. Any idea what the problem is? If I try to force it, I'm afraid I'll snap the lever off. Is it simply a lever on a pivot point like a pin? Any advice or insight greatly appreciated. Thank you!