Removal of swing pins that are located under engine of a Vermeer SC252 grinder

[Glen McInnis]

Hi. I'm attempting to replace the 4 bushings in the swing arm assembly of a Vermeer SC252 grinder. Two of them are more easily replaced as they are located close to the cabinet housing where the pins can be driven out with some pounding from the top. But the other 2 are located under the engine. (This question does not concern the vertical boom assembly). How can I get them removed without having to take the engine off the machine? Any ideas? Thanks