Quoted from JimmyJames:
This guy on the left in the picture however, (no label.... spotting unit latch? Energized by the red start button) it stays powered sometimes and does get hot. I haven’t figured out why. Sometimes it works and sometimes it hangs open it usually stops right as I’m about to shut the power off.
closed enough. The thing is called the "spotting index unit" or "index coil assembly (spotting disc)" or "spotting cams index" or "mixer spotting cams index"
I guess the common words are spotting and index.
anyway, that thing has only one switch that powers it....CU cam 4C. There's three possibilities assuming no shorts in the circuits:
1] the drag are cams are pausing the rotation of the CU cams briefly...a couple seconds extra. That makes the cycle longer and it's obvious because the lights are flashing longer. That's normal.
2] CU cam 4C switch is not opening reliably. Check/adjust the switch.
3] the CU cams are stalling because the clutches are worn or too oily. When the cams need to lift a lot of switches at the same time, the clutches slip but may eventually grab and keep going. Your only options here are:
- if too much oil, try and get rid of it. There shouldn't be liquid oil on the clutches.
- there's a nut and spring on the CU shaft between the metal drag arm cams and the brown bakelite timer cams. Turn the nut to compress the spring more...that'll put more pressure on the clutches
- if the clutches are worn too thin for the tension adjust to compensate, it's time for new clutches. They show up on ebay occasionally. You probably need 0.5" x 1.5" leather clutches for that game, but you'd want to check.