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Grundig non-engagement of AM to FM coupling
10/2/2006 1:59:01 PMPhilip
I have a Grundig-Majestic 7035USA console radio. It has BC, FM, SW I&II. If you are familiar with this radio the FM is tuned via the engagement of a AM to FM clutch coupling and flywheel. The problem is the FM is not being tuned. The material (is this the clutch) between the flywheel and the FM disc may be worn out. If I squeeze the flywheel, material and FM disc the FM condenser turns. How do I fix this?
Philip
10/2/2006 6:29:09 PMGary
Phillip, I have a Grundig 4090 with a similar clutch arrangement. The clutch material is typically made of rubber and can dry out. Mine was not as bad as your situation, but I had the clutch rebuilt by a gentleman in CT that has good experience with Grundigs. I believe he used a bicycle innertube to rebuild the clutch. Hope this helps.

Gary

:I have a Grundig-Majestic 7035USA console radio. It has BC, FM, SW I&II. If you are familiar with this radio the FM is tuned via the engagement of a AM to FM clutch coupling and flywheel. The problem is the FM is not being tuned. The material (is this the clutch) between the flywheel and the FM disc may be worn out. If I squeeze the flywheel, material and FM disc the FM condenser turns. How do I fix this?
:Philip

10/2/2006 8:21:48 PMThomas Dermody
If you can take it apart, you can do it yourself, too. I've used inner tubes quite a bit. Cork works well, too. If you can spread the disc, you can place a coarse sand paper against it and roughen it up. This is a cheap and easy alternative to having it rebuilt, but it doesn't always work.

Thomas

10/3/2006 6:13:18 AMWalterh
Hi

In most cases, it is just hardened grease that disables proper working of that clutch arrangement. Cleaning and relubing will often solve the problem.

Kind regards, Walter Haring, Switzerland

10/3/2006 10:38:29 AMPhilip
:Hi
:
:In most cases, it is just hardened grease that disables proper working of that clutch arrangement. Cleaning and relubing will often solve the problem.
:
:Kind regards, Walter Haring, Switzerland

Gary, who is the gentleman in CT and how can I get in touch with him?
I see a c-ring at the end of the shaft and compressed springs. Do I remove the c-ring, without sending it into space,slip out the shaft from the front and replace the clutch and hopefully push in the springs and attach the c-ring?

10/3/2006 12:43:25 PMThomas Dermody
That's it. I don't recommend that you ever lubricate this clutch, as someone else suggested. Oil will make it slip worse. If anything, there should be an extremely fine film of oil on the sliding surfaces of the shaft. This cannot get onto the rubber.

Don't remove the C-clip in a way that the spring can hit you in the eye. I almost did this with the spring on the accelerator pump in my carburetor. Wear goggles if you must.

Thomas

10/3/2006 2:16:20 PMWalterh
:That's it. I don't recommend that you ever lubricate this clutch, as someone else suggested. Oil will make it slip worse. If anything, there should be an extremely fine film of oil on the sliding surfaces of the shaft. This cannot get onto the rubber.
:
:Don't remove the C-clip in a way that the spring can hit you in the eye. I almost did this with the spring on the accelerator pump in my carburetor. Wear goggles if you must.
:
:Thomas

Hi

Sorry - seems that the fact, that english isn't my mother tonge, misleaded. Of course i would never recommend to lubricate the clutch *itself* but the mechanical parts that slip forth and back and engage / disengage the metal part and the rubber (?) clutch. And there is not only the shaft but also the lever mechanic at the push buttons that can have problems to move freely.

Kind regards, Walter Haring, Switzerland

10/3/2006 5:06:43 PMThomas Dermody
Ah. Sorry 'bout the misunderstanding. Lubrication of the moving parts is a good idea, though.

Thomas

10/3/2006 6:55:23 PMGary
Philip, you can contact Bob Eslinger at (860)928-2628. He does Grundig repairs. Good luck.


::Hi
::
::In most cases, it is just hardened grease that disables proper working of that clutch arrangement. Cleaning and relubing will often solve the problem.
::
::Kind regards, Walter Haring, Switzerland
:
:Gary, who is the gentleman in CT and how can I get in touch with him?
:I see a c-ring at the end of the shaft and compressed springs. Do I remove the c-ring, without sending it into space,slip out the shaft from the front and replace the clutch and hopefully push in the springs and attach the c-ring?

10/4/2006 6:19:29 PMPhilip
:Philip, you can contact Bob Eslinger at (860)928-2628. He does Grundig repairs. Good luck.
:
:
:::Hi
:::
:::In most cases, it is just hardened grease that disables proper working of that clutch arrangement. Cleaning and relubing will often solve the problem.
:::
:::Kind regards, Walter Haring, Switzerland
::
::Gary, who is the gentleman in CT and how can I get in touch with him?
::I see a c-ring at the end of the shaft and compressed springs. Do I remove the c-ring, without sending it into space,slip out the shaft from the front and replace the clutch and hopefully push in the springs and attach the c-ring?

Hi to Gary, Thomas and Walterh,

You're not going to believe this. I was standing over the radio thinking about the problem and studying the layout when I just decided to push the FM pushbutton for no apparent reason. Lo and behold the lever moved and the flywheel moved and engaged the FM disc. I turned the tuning knob and the FM condenser turned. I was flabergasted. The point is I never saw two separate tuning condensers, one for AM and one for FM. Thanks to all. I learned a lot from your expertise. Case closed. While I have your attention I need the dial cord and stringing diagram for the AM (BC)dial. I broke it probably forcing the FM.
Philip



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