mst-206 slippage

Hi guys

I have a slippage on my mst 206 .I know the belt and pulleys are good (I could see them turning) the tractor moving on all speed but if I block the tractor I could engage it on every gear and the motor still running free if I it the gas while Im engage its like I push the cluch . Im feel like something wrong between the tranny pulley and the internal gear . I will double check my hub but Im sure its not the problem

I will open the tranny the find and fix but I ask before
Anyone have an idea or experiment that problem before me???

I have had 3 mst's and the problem is most likely the shift keys. I would bet on the shift keys, but it could be the input shaft bevil gears.

I'd say it's in your belt system when you have a load on them. Usually transaxles don't slowly slip or loose power (automatic car transmission going out slipping per say) buy more of getting clunks, bangs, thuds of gears getting all messed up is gears were stripped or broken. Sometimes the shift keys get worn or messed up and it pops out of gear, like neutral inbetween gears. Any belt mods? Pulley swap, custom clutches?

Thank you guy for these answer they realy instructive for me but fortunately I found my problem and I feel a bit stupide . It was my homemade hub who were temporary install so on one of those the locking bolt just fail and the axle just spining in the hub