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I have a Jennings .25 Standard Chief slot machine. Occasionally, while playing the coin will not drop into the correct position of the escalator unless you bump the top of the machine. At other times the machine will cycle several times without the escalator advancing any coins (free play). Sensor pin adjustment does not eliminate the problem. Are there any other adjustments I can make rather than removing and overhauling the escalator.

If the problem began recently and the machine gets a lot of play it could be a build up of dust and dirt or lint, which can cause coins to hang up. Try some compressed air not set to high and blow out the areas that the coins travel and this might make a difference. Quarters are big enough that that would be somewhat rare, post if successful. T.J.

With my experience with the Jennings escalator mech, I would let the whole assembly rest on its front gently, and spray the linkage with PB Blaster. The reason for resting on the front side is to keep it from dripping on the reels. The mech should move freely when advanced. If the grease is just to much, mineral spirits will clear it. You will need to re-apply lube after using it because it will strip all of the lube that is there. I have found the this escalator will not work well if it has stiffened grease on it.
Dave F