Thorens TD124 MKII idler wheel and stepped pulley problem - diyAudio
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Old 1st January 2012, 07:51 PM   #1
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Default Thorens TD124 MKII idler wheel and stepped pulley problem

The idler wheel of my Thorens TD124 MKII (ser#83443) isn't properly engaging the stepped pulley at any of the speeds. As I've tried to show in the drawing, the idler wheel contacts too high

Click the image to open in full size.

I've checked both the owner manual and service manual, but find no mention of any idler wheel/pulley alignment. I only have one thin nylon washer below the idler wheel and I don't think I should run it without any washers at all. The manual shows both felt and nylon shims beneath it.

Thanks for any advice.
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Old 1st January 2012, 09:40 PM   #2
kevinkr is offline kevinkr  United States
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Verify that nothing is stuck/sticking in the speed stepping mechanism, and idler arm, and make sure that the cam that sets the pulley height is fully seated with washer, and c-clip in place.

You can raise the intermediate pulley slightly by loosening the lock nut and turning the set screw slightly clockwise to raise the intermediate pulley.
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Old 2nd January 2012, 02:07 PM   #3
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Default Thorens TD124 MKII idler wheel and stepped pulley problem

Thank you for your reply. I've tried to loosen the lock nut, and it doesn't budge. I sure don't want to apply too much torque and end up breaking it! I have no access here in the tropics to penetrating oil. In envy people who can just walk down to the nearest hardware store (I suppose that nowadays in the U.S. I should say drive over to the nearest Home Depot).
i'm not sure where to locate the "the cam that sets the pulley height ... with washer, and c-clip".
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Old 3rd September 2012, 06:29 PM   #4
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Do you have access to a socket set? That should do it.

The locknut is usually a bit tight, but once you break it loose you'll be ok. Then, all you need to do is use the screwdriver slot to lower it. (CCW)
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Old 3rd September 2012, 06:46 PM   #5
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Quote:
I have no access here in the tropics to penetrating oil.
A 50-50 mix of automatic transmission fluid and acetone is has superb penetrating qualities, better than most commercial formulas according to a test I read somewhere.



You've got caipirinha down there, which more than makes up for the unavailability of penetrating oil.
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Old 5th September 2012, 11:37 AM   #6
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Quote:
Originally Posted by Joe Roberts View Post
A 50-50 mix of automatic transmission fluid and acetone is has superb penetrating qualities, better than most commercial formulas according to a test I read somewhere.

You've got caipirinha down there, which more than makes up for the unavailability of penetrating oil.
I'll give the ATF/acetone mix and the socket set a try. Many thanks to both of you. But I'd better do it before I have my caipirinha.

Last edited by billinrio; 5th September 2012 at 11:40 AM.
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Old 5th September 2012, 03:30 PM   #7
volken is offline volken  Netherlands
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The best way to unlock the srews is with a small heating gun !
after this cleaning .
regards

Volken
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