Some good advice already given above. I will add that while the puller is loaded, I like to use a pair of hand sledges 180 deg. apart, one as a back-up & rapping with the other on the outside of the Pitman. BE SURE you have the nut back on to retain it. IF you heat it, you must use a rosebud tip for max. fast heat so's it doesn't just soak into the shaft & expand it equally.
Doug