Did you reinstall the cutting blade? Did you put it back on the right way??
Is this machine possibly a reel mower? I don't know of any body who can give advice on reel mowers, except maybe golf course workers, who use reel mowers a lot in their work. Just be patient--somebody will surely respond who knows that machine.
Rusty J.

Go over to the lawn forum and search "Is my reel mower causing this problem?" I have given several step-by-step reel/bedknife adjustment and backlapping instruction posts over there. Just go do a search.

Not clear whether you are still having problems after the shop resharpened, or whether it's OK now and you want to maintain goiing forward.

It seems that part of the problem was that the sheet-metal piece that sits behind the blade had been rusted. Does anyone have an owner's manual or parts list?

Thanks,
Todd