Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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There are two large round pins, one on either side where the engine mounts, the engine mount bracket actually slides up and down on these pins. You can lubricated those pins and see if it will help.
I am including a diagram of the unit so that you can get a better idea of where these are at. You will notice the pin in the upper right of the diagram, it goes down through the engine mount bracket and frame, then the engine bracket slides up and down on it when shifting forward and reverse.
I hope that this helps you.
The bolt in the side will allow for a little to get in but that is what actually holds the pin in place. If you remove it then you can drive the pin out and clean it so that everything moves as it should. If I were going to remove them I would do them one at a time. You could also try applying some heat to the engine mounting bracket where the pins go through it, it might help to loosen them.