Snapper walk behind Drive wheel problem

I have a Snapper walk behind 22"?that ran fine until I changed the belts. Now the drive wheels will not engage. Belts and drive cable are tight. The problem seems to be the gear box but I'm not sure. I do get a slight pull but very little.
Any suggestions on the problem and fix?

Hhpiper said:

I have a Snapper walk behind 22"?that ran fine until I changed the belts. Now the drive wheels will not engage. Belts and drive cable are tight. The problem seems to be the gear box but I'm not sure. I do get a slight pull but very little.
Any suggestions on the problem and fix?

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The part that said, ran fine until I changed the belts tells me you most of done something wrong??? Just take your time and recheck you steps. I can't under stand why just changing the belt would do something to the gearbox? Not unless you took something apart and if that is the case you still had better recheck your steps. Did you remove any pulleys and leave out a key some place?