8mm Forum: Sankyo 2000H motor not turning, but belt is not broke!

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Posted by John Pierson (Member # 6665) on August 22, 2019, 08:44 AM:

Sankyo 2000H motor not turning, belt is ok
Got a 2000H beater for $10 and it will be my first one to service! Watched that famous YouTube video and replaced the lamp; yay! Gonna run through the rest of the services tonight. But... My issue is, the spindles don't turn in reverse or forward, but the belt looks ok. It does feel a bit loose. But when I took the light clip off from the front, the motor started turning and I ran a film through it. It worked for a bit, but then stopped again a couple times. Maybe the belt inside is too loose? Or do you think something else might be causing the motor/spindles to not actually turn at times, even though the fan is on, etc.?
Tonight I'll replace the belt, but I'm concerned that might not be the problem. Thanks for your takes on this, sorry for rambling!

Posted by Will Trenfield (Member # 5321) on August 22, 2019, 04:27 PM:

Hi, John. I have two of these excellent projectors and they work very well. It's hard to believe that they are 50 years old. A while back, I was given an older, branded projector which used a similar motor to that used in the 2000H. Despite changing the belt, the motor shaft would hardly turn. There's a bearing enclosure where it leaves the motor by the belt held together by tags. I was able to prise up one of the tags just enough to get a little light oil into the bearing. There seemed to be a felt washer in there which soaked up the oil. This soon freed up the shaft so I pressed the tag back into position. Manufacturers used to say that the bearings were sealed for life and didn't need oiling. I doubt that they thought their projectors would still be in use half a century and more later. Hope this helps.

Posted by John Pierson (Member # 6665) on August 22, 2019, 05:19 PM:

Hi, thanks for that tip! I guess I need some oil if I have to go to that step, as I only have WD-40 and I saw plenty of warnings about not using that...! I suspect vegetable or olive oil won't do the trick either ; )
Sounds good because the symptom is the round pulleys or whatever the belt sits on, at times doesn't move. Then if I give it a shove, it does start and keeps running. Very weird!
Appreciate your experienced insights! I think in that 7min youtube service video, it did show the presenter putting oil on two different felt pads. Maybe the same area!

Posted by Will Trenfield (Member # 5321) on August 22, 2019, 05:51 PM:

I used some model railway oil but it's probably the same as sewing machine oil. I dipped a cocktail stick into it and applied it several times to the felt washer until the motor shaft freed up.

Posted by Nantawat Kittiwarakul (Member # 6050) on August 22, 2019, 08:07 PM:

Assuming that it is electrically OK. It could be either sticky motor bearing, or it could be sticky mechanism, or both. [Roll Eyes]

Whatever the case a bottle of decent sewing machine oil/all in one oil should be more than enough to fix that. [Big Grin]

Posted by John Pierson (Member # 6665) on August 22, 2019, 09:17 PM:

Hey Team : ) Well, my follow-the-7-minute-youtube-video service event lol went well I guess. Did not replace the belt because I wanted to see if lubing it would be enough. Used some actual oil that came with an electric razor...! But, forward or reverse will, when first started, not turn the spindles. Then one direction will work and kicks in the other and it's fine until you stop it for a while. But I suspect either side won't start eventually (soon) and I'm back to something weird w/ the motor getting stuck. I could replace the belt just in case it's needed to help start the motor...? Wow this is long!

Posted by John Pierson (Member # 6665) on September 03, 2019, 06:37 PM:

Just a final ujpdate as I'm sure everyone is waiting with baited breath; I can smell it from here!!! It appears this unit just has a weird physical bug, where the spindles don't turn sometimes on the 1st turn of the "forward" or "reverse" switch. But if you turn it to the other direction, the spindles so far, do work and then both sides work fine until you turn it off again for a few min. It's hit and miss, but it always starts running again if this symptom shows up. I guess I'll use it as is, as it was a very inexpensive 2000H. If I invested more in it, I'd dig deeper. Thanks for everyone's help!

Posted by Nantawat Kittiwarakul (Member # 6050) on September 03, 2019, 08:07 PM:

The classic question of "Is that worth fixing?" with no definite answer. [Roll Eyes]

It might be possible to repair this. But considering time/attempt to achieve that it would be questionable, to say at least.

Posted by Will Trenfield (Member # 5321) on September 08, 2019, 04:20 PM:

John, your last post triggered a memory. I had a projector which sometimes refused to start when I switched it to forward. It would usually work normally when I tried it again. I mentioned this when I sold it with some other surplus cine stuff to a dealer. He said that he always replaced the belts on any projectors he sold. Although the original belt might look ok, they can distort and develop flat spots, as he called them, leading to a loss of traction at times. It might be worthwhile replacing the belt. There's a guide on here as to how to do it

http://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=010487

Replacement belts marketed are usually "O" rings as used in plumbing and available quite cheaply at builder's merchants.

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