Quoted from Uncle___rico:
I just had this exact problem. What fixed mine was that I had to disassemble the elevator and clean and lube the elevator slides and elevator arm pivot joints. On mine, I also found the elevator mounting bracket was slightly bent. I had to tweak it straight again. I also resoldered the connections on the elevator motor. After doing all that my elevator moves very smooth and is whisper quiet. Hope this helps.
What was your choice for lube on the elevator slides?
Quoted from Uncle___rico:
I just had this exact problem. What fixed mine was that I had to disassemble the elevator and clean and lube the elevator slides and elevator arm pivot joints. On mine, I also found the elevator mounting bracket was slightly bent. I had to tweak it straight again. I also resoldered the connections on the elevator motor. After doing all that my elevator moves very smooth and is whisper quiet. Hope this helps.
I confess that my cleaning and oiling (using electric hobby motor assembly oil) stated above was without taking the elevator off the machine. When the CPU chose to run the elevator, it did run smooth, quiet, with no apparent binding. But, not being too stubborn, I heeded your advice, removed the elevator from the machine, disassembled it completely, cleaned using automotive Brake Parts Cleaner, ran strips of cloth soaked in Brake Kleen through the brass bushings, and rebuilt it using MikeO's lube suggestion everywhere. Lo and behold, that lowering of friction slightly, there must be current sensing feedback, because now the CPU will run the elevator. 10 games in and in test it's still working. Thanks everyone!
Overland Park, KS
