Here is a picture of the broken leaf spring. You can see the grease where the bearing is supposed to go.

Here is the Beocord 9000 cassette assembly showing where the broken leaf spring came from.

Here is my working Beocord 8004 HX-Pro cassette assembly and what the leaf spring should look like (when it is not broken).
The leaf springs appear to be the same between the 8004 and 9000 but the tape heads and wiring are different.

I am concerned now that even if I am able to pull a spare part for the broken assembly, installing it will require taking off the tape heads. That means having to deal with alignments during the re-install. 

I just realized that my broken spring on this Beocord 9000 is the same spring shown on the thread "Beocord 8002 mechanism, mysterious spring" by Beoworld member, hamacbleu. Martin said the part can be glued back in place. I will need to steal a bearing for it from another deck I guess.

What kind of stress does that piece that holds the spring take though? For it to break like that, something with a lot of force must be hitting it.

I opened up and checked my other two Beocords, the BC8000 and the other 8004 HX-Pro. The 8000 has the leaf springs intact but the second 8004 has the same left side broken off. So my 9000, one of my 8004 decks and 8002 (of hamacbleu) all have the same break. Same problem across three model numbers. If I glue it back in place I wonder how long it will last and, again, what is the source of the problem?  I would like to do some preventative maintenance on my 8004 deck that works and steal the display from the 8004 that doesn't work.

On the 9000, I am thinking of either going with the glue fix or stealing the unbroken pieces out of the 8000. The latter would be preferable as long as I could be sure the head alignment wouldn't get fouled up. 

I think I know what might be causing the left leaf spring assembly to break.

Looking at the 8004 HX-Pro that is still intact. This is a picture of the cassette assembly with the heads disengaged. I have marked the direction of travel the head assembly will travel when they do engage.

Here is the 8004 with the heads engaged. You can see where I have marked "contact point". There is not contact there but it is very close. I think that if the bearing fell out or some other mechanical issue happens that can skew the head assembly's motion, that point could come into contact. If there was contact there, the metal head assembly hitting the plastic leaf spring mount could weaken and eventually break it.

That being the case, I think gluing the leaf spring mount back in place should hold up as nothing should come into contact with it (under working conditions).

sonavor wrote:

I just realized that my broken spring on this Beocord 9000 is the same spring shown on the thread "Beocord 8002 mechanism, mysterious spring" by Beoworld member, hamacbleu. Martin said the part can be glued back in place. I will need to steal a bearing for it from another deck I guess.

What kind of stress does that piece that holds the spring take though? For it to break like that, something with a lot of force must be hitting it.

Find a small ball bearing, cover it with inside a rag, crash it with a hammer, you will now have balls for more decks🙂