stuck sled

[rdz]

long story
i was out sledding across field sled started to bog so i stopped seen oil dripping underneath checked dipstick really low so i pop off the belt and towed sled with a friends ride couple miles to the road hauled it home in truck tear it down cause was oil filter leaking got that all fixed up (complete oil change + filter) put back together runs great but struggles to move couldn't get it even 5 feet on concrete my question did i wreak it towing ? maybe brake is stuck will look at that tomorrow any suggestions or things to look for

 

[NOS-PRO]

Nothing should have went wrong....other then ice build up.

Clutches could also be wet, full of snow, or residue from towing....that will slip a belt instantly.

 

[rdz]

k got it to move but has a knock in engine and wont rev up i think engine is toast pulled plugs and turned over by hand sounds ok put screwdriver in on top of pistons and their still moving up and down now what tear whole engine down