cub cadet pto

I have a cub cadet z force 60 with a steering wheel, I had the drive belt changed and all seemed well, but now it doesn't pull the blades very good when you put the pto in gear, it bogs the engine down, always has but it don't catch back up all the way now and it wont cut the grass, just boggs down. Could it be the clutch out of adjustment?
If so, how can I adjust it?