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Weak motor (sometimes)

S

SFM-Ptgal

I'm tweaking my vintage Harris triple cart decker. I found another issue:
When I put the 3 decks running at the same time the capstan simply dies (to much pressure against it?) When one of the decks stops the motor re-starts slowly until get the full speed. Tomorrow I'll adjust the top bearing to see If I manage to fix the problem. An ignorant question: Are there any capacitors related to the motor and can they be related to the problem?
 
I'd look towards replacing the bearing(s) in the motor and the top of the capstan. I'd look particularly at the top motor bushing... when you start all 3 carts, you flex the capstan a bit and side load the upper bearing. This will make it wear fairly quickly.
As to caps, I forget, but I think that thing has a synchronous motor, requiring no start capacitor. Shaded pole starting is much more common in small motors than capacitor start.
 
I had the same problem many years ago and I think It was on a Harris triple deck. May have been an ITC. It had a bad capacitor. I replaced the cap and it ran many years untill it was pushed out the door by a computer.
 
1. Never saw a motor start cap use PCB oil
2. If the motor is reluctant to start it might be the motor start cap, but, once running, motor problems usually come down to bearings. I've gotten cart motors going without the motor start cap by giving them a good spin.
 
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