I recently had the same problem with my 30.30 lever action. I found on mine that the problem was in the loading door where you put the bullets in. I loosened the straight screw that holds door on allowing the action to free up.The screw over time becomes loose allowing the gun to jam while working the action . I now check this screw often. Hope this information helps.
It would be best if you took it to a Qualified gunsmith for repair.
Yes
Marlin
there is a marlin collectors site or gunbroker.com
1990
Not enough information given to answer this question.
1984
30
By including the serial number in your question,we will be able to answer when your Marlin model 336 was produced.
the cost 3030 cal 336sc
This would be best left to a qualified gunsmith to do.
Model variation
All depends on condition, model, accessories,...etc.