3 X 16 JD plow

The plow has a tendency to trip too readily like as in with just hard ground. It's always and only the front plow.

In looking at the trip mechanism, it looks like the notch is rounded off a little on the corners. Could I remedy this by dressing up the notches a little. I would really like it to trip with a rock etc but I spend too much time resetting it right now.

Could a good old fashioned cleaning and greasing of the mechanism be the solution. There is some rust and corrosion there but not all that bad.

Anybody had similar experince with these?

To work properly, the larger shims must be assembled over the smaller shims.

Also if it trips too easily, it could be.

Slot in standard rounded.
Throw-out roller damaged.
Excessive wear on pivot stud.
Coil spring broken
Dirt packed under throw-out roller.
Plow running on nose.