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4 replies

Need Help with 773 Smoke Unit

JS Joe SOGR Forum Member

I have a1950 version of Lionel's  773 Hudson. It runs well.  Smoke unit  heats up and is clearly "making smoke".  However, mid-run, the puffing action ceased.  As far as I can see, the metal piston cup freely travels up and down, and the piston actuator lever moves.  The lever is actuated by the back and forth movement of the valve gear.  There is a small half-round piece against which the piston lever moves at the end of every stroke.  Should the lever be "inside" the half-round shaped piece, or "outside"?  Presently, it is outside and perhaps is not allowing the piston actuator to travel through its intended full range of motion.  It is not clear to me how to reposition this lever within the valve gear.  If the lever is in the correct position, what could have caused the puffing action to stop? 

Thanks,

Joe S.

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JS Joe SOGR Forum Member

Thanks for all your suggestions.  Since our little piece of paradise is under a quasi-lock down, I had a lot of time  to work up the courage to tackle the complexities of disassembling the 773.  It seems I diagnosed the problem correctly, although I have no clue as to how the piston actuator changed its position in the valve gear.  By relocating the rod so it sits "inside" rather than "outside" of the little cup-shaped piece against which the rod moves, I seem to have restored the full range of motion.  The result is a lot of smoke...more than any other loco that does not have a fan driven smoke unit.

I hope everyone stays safe and healthy.

Joe S.

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