Skid steer question -

[chainsaw_louie]

Hi , 
We have a New Holland 190 skid steer and we recently repaired the bearings and seals on one rear axle.
Now when using it , the front wheel on the same side makes a clunk-clunk noise and stops turning for an instant.
It is almost like the chain is loose and skipping on the sprocket,  but these chains and sprockets are so huge it seems unlikely that they would or could slip on the sprocket.
There isnt much slack take up possible but we will try and make the chain as tight as we can.

Has anyone else run into this ?

Thanks.

Tim