Well after getting the wiring diagram cleared up with an older post on the gas station wiring from Dennis S, I found some troubles with my MTH car wash. Seems like everything is working on this one but the motor drive is struggling. After taking a look at the gear box chain and whole drive, I realized there was something more going on.
While the whole thing was totally apart, I noticed that the main drive wheels (very large gears) that spin on the base by the chain, would not even rotate with the motor gearbox assembly removed?? Even after cleaning and just each gear with the chain off, I wondered how the motor could be expected to turn this thing?
So, some old skills come into play. First I took a pencil and rubbed it sideways all over the inner bearing surface that mates with the base. This surface is supposed to act like a lazy susan without the help of any bearings? It's just too tight a fit. The base and gears are not warped anything appreciable. So with this pencil marking the whole surface a laid a razor on it's side, scraping away the surface, while dragging it away from the surface. It's kind of like a filing method we used on formica or laminated edges of shelfs. Anyway you can think of to do it, these gears should spin freely by hand and need to be thinned down, just a hair! The pencil marking provides a guide to know when the entire surface is getting scraped evenly.
After another cleaning and more graphite it all works now. I'm afraid to post this and have the original owner get mad. Maybe, this will help anyone who has these operating accessories that can hear the gear box struggling to operate the chain driven car around. There's a lot of switches inside that tell the board when conditions are met, to go forward with the procedure. So I'm sure each one that breaks down may have different problems. I would just take it apart and slowly check each problem as it arises in the cycle. Nothing should be that hard to turn.
