You can heat it without trouble, just allow it to cool slowly. I wouldn't do it outside in very cold weather though. It is cast steel , not iron and its high quality metal.
If you are concerned, the best method is to use a mini-torch sold by CAT. It uses magnesium rods and will cut through the center of the pin quickly without heat the frame much. This is what I use to cut out the pins. Just burn through the center and allow it to cool and the pin will knock out easily.
The pin is approx. 4 1/2" long. Will this mini torch cut right through? If so how much of the center do I have to remove?
It will take several rods to burn through the pin. Raise the machine as high as the stabilizers will go and burn a 12-14 mm hole in the center. Stay a straight as possible to avoid burning through the pin and into the swing tower. Wear leathers to prevent burns.
Ok thanks Donnie. This is helpful.