Check you linkage on the transmission. Its external and may be muddy or full of straw. Next, make sure the cables are all adjusted right. I had to put new gears in a 2188 last winter because the owner didn't adjust the cables and instead just used a tarp strap to hold the machine in 2nd gear. Gotta makes sure the gears are fully engaged and the detents are working right. If it comes down to taking it out, its not a lot of money to put the gears in (got mine from A and I through Worthington and it was under $800 I think.