There is a tang on the left hand crosshead that pushes the smoke lever with the arm down. The smoke lever the pushes the piston inside the cylinder of the smoke unit. So most likely the tang on the crosshead is bent or missing or the piston cup is stuck in the cylinder or missing. Another source of the problem is a blocked air port in the pellet cup from too many pellets. The tang on the crosshead is to move the smoke lever forward, not back, that happens with gravity.
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