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Quite often the deck will slide on pavement, concrete, or other hard surfaces. If you have load and go then place the deck on a flat spot of your lawn, make sure you're in 4wd, and make sure the deck wheel are up and unlocked.

 

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Do you rev up the engine when driving over the deck. TY

There's no need to go any faster than just above idle, and running into the deck at higher speeds may cause damage to the deck or tractor. If your driveway is flat leave the deck on the driveway but with the front edge against the grass so that the deck pushes up against the grass edge stopping the deck from sliding forward. Doing this will allow you to drive over the deck at a sane speed. Then if anything is not properly aligned you won't destroy it.