The hinge pin tends to rust to the hinge bracket or the pin wears slots and won’t slide sideways. Sometimes you can weld a bolt on the end of the pin to work it back and forth, then you can try the air hammer. If you have to air hammer it out, it’ll need air hammered back in plus aligned, I’d cut and weld. If the existing springs still work, you can add an auxiliary hand crank for her to use. She can hook it after the animal is loaded so there is no cable to get caught in.
