Cement Mixer Repair - How to get at chain?

[sdboers]

Hi - I picked up a practically brand new 3 point hitch cement mixer (Cosmo Mixer 80). Only issue is that the previous owner managed to skip the chain and get it stuck between the guard and the large sprocket. It looks like a pretty simple repair - but before I make it more complicated - I thought I'd ask... What is the easiest way to remove the drum (or the back guard) from the mixer to expose the sprocket?

 

[sdboers]

Ok - figured it out. Had to press it out - but needed a bar across two strong points on the back to do it.

 

[Ajbolts]

Ok - figured it out. Had to press it out - but needed a bar across two strong points on the back to do it.

I think I have the same problem, guessing the chain was too loose and it came off the large sprocket and got wedged. I thought I could unbolt the drum but that did not work since I can't get to the back side to loosen the nuts. Did you need to loosen the main bearing or does it just pry off?