Bendix 7414 Motor Pulley keeps detaching

[jmurray01]

Hello guys, long time no post!

My Bendix 7414 tumble dryer that I have owned for over 2 years has decided that it wants to break the years of flawless service with a rather major problem.

About two weeks ago the dryer was working fine (though it had started making quite a loud clattering noise which got progressively worse over a month or so) and then there was a "bang" and the drum stopped rotating.

I took the cover off and found that the belt, although still in one piece, was very stretched and cracked. The motor pulley (that the belt rides on, not the whole shaft) was lying on the bottom of the case but I assumed that was just because of the ferocity of the belt derailing.

Long story short - I got a new belt and fitted it but after only 30 minutes of use the same thing happened again!

Since then I have put it back together 3-4 times and it keeps coming off, even with the little retaining screw in as tight as possible.

I'm hoping you folks will have some ideas, because I'm fresh out.

 

[hotpoint9534]

Hi,

I'm not familiar with these models, but the symptoms suggest that it could be down to a worn rear drum bearing or a worn jockey pulley (maybe both).

Maybe someone more knowledgeable will be able to help further. The parts diagram I've linked to below may be useful though if you need any spare parts.

Tom

http://procornerpdf.electrolux.com/static/Pictures/Views/U0P06/069.PDF

 

[jmurray01]

Thanks Tom.

I don't see how a worn bearing or tensioner wheel could possibly cause the motor pulley to come off though, when it is very tightly in place to begin with. Sure, the belt might go, but why the pulley?

It is a strange one indeed!

 

[hotpoint9534]

I hope you manage to solve the problem. Tumble dryers aren't my strong point unfortunately. You could always ask at http://www.ukwhitegoods.co.uk/ as they have engineers on there who can probably help.

Tom

 

[jmurray01]

Here is a picture of the new belt fitted - maybe this sheds a light on the issue?

 

[jmurray01]

From further out...

 

[jmurray01]

And a different angle...

 

[jmurray01]

A picture of the drum. Please help if you can guys as I really want to get this dryer working again!

 

[jmurray01]

Oh yes, and finally a picture of the motor pulley which keeps detaching from the shaft.

 

[cfz2882]

could drill and tap the pulley for a 2nd setscrew at 90*from the original-that should keep the pulley from loosening even if the pulley shaft bore is slightly oversize.

 

[terryT]

Keyway? Detent?

If there's no keyway (from which a locking key is perhaps now missing) and no dimple or detent in the motor shaft to receive the set screw, then I would merely clean the setscrew and the female threaded area with a solvent to remove all traces of oil and use Loctite Threadlocker BLUE 242 (or equivalent) on the male threads and reinstall.

You shouldn't have any problem after that.

Loctite Blue 242 is a non-permanent locking compound, in that the screw can be loosened if necessary but it keeps it from "walking out." I've used this on boiler feed pump rubber coupling set screws with great success. Often you will find that they used just this sort of compound during manufacture.

Loctite red and green should not be used in this application. The Red requires a lot of force to remove and the Green is a permanent locking compound.

Good Luck!