I Googled that model and it looks like the model Deere that has the same rear frame as an older 500 series Toro. Horizontal crank Kohler driving the pumps under the seat with a multigroove belt. Basically the same engine plate as the Toro from just under the seat on back to the rear. I would check their dampers out.
The good thing is that the damper only provides some resistance to handle movement, to both keep the mower from jerking and to keep from damaging the pump.(Quick movement of the control handle causes the rotor in the pump to blow/jump off of the wear plate which in turn causes the case pressure to rise and possbly blowing one of the case seals.)
It probably would not have to be the exact damper to improve operation.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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