Ram was stuck in the down position, would not return up.

1.I removed the back of the compactor
2. turned the large nut to raise the ram so I could remove the trash container
3. removed the bolt holding ram plunger onto the actuator
4. put the chain on by starting it on the large sproket and walking it around. there was enough slack to do it this way.
5. cleaned and oiled everything and reassembled.