8mm Forum: SD 1200 D stopped running

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Posted by Alan Smith (Member # 843) on June 03, 2007, 12:14 PM:

I removed the two drive belts and the motor/fan attached wouldn't run without a push.

Apparently dry bearings. After running perhaps 30 min. yesterday it stoped. Hot? Frozen?

After cooling overnight the motor still needed a push to start. Starting capacitor perhaps? I see that the motor shaft is exposed at the end opposite the fan. Any recomendations re. appropriate oil to try. I've had some success with penetrating oil on other items. I'd like to have luck with this approach before trying the capacitor.

Of course the belts are still an issue.

Regards, alan

Posted by Kevin Faulkner (Member # 6) on June 04, 2007, 04:39 AM:

If the motor turns freely by hand but need a push to get it going then I think the most likely culprit will be the start up capacitor.
You should be able to get a replacement at most electrical component or motor suppliers.

Kev.

Posted by Alan Smith (Member # 843) on June 04, 2007, 10:49 AM:

Thank you for the tip re. the capacitor -- I assume it's the grey can to the right of the motor with two heavy grey wires soldered to it. If so I'll remove and take it to a parts shop for a match up if available.

What set me off re. lubrication is that when I spin the motor (belts off) it comes to an abrupt stop rather than coasting to a slow stop (more so when spun clockwise, viewed from the pully end).

Again, thanks for the interest and the suggestion, alan

Posted by Lars Pettersson (Member # 762) on June 08, 2007, 01:52 AM:

You may want to look into the brass bearings which the core of the motor revolves on. I´ve seen these being worn such that their center hole is no longer round but rather oval, meaning -in severe cases- the core of the engine comes to close to the mantle surrounding it and just freezes, like an electromagnet. In the case I saw, I could get away with just turning the brass bearing 90 degrees, as the motor axle is pushed in a constant direction by the drive belts.

Cheers,
Lars

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