The thrust roller (or pinch roller) looks pretty similar on various brands of cassette decks.

Here are some other rubber rollers/wheels that I think are unique on the Beocord 9000 (and 800x) decks.

The clutch assembly of course.  This is one I repaired and cleaned up (although there is still a little belt residue in the pulley).

Also, this arm assembly with two wheels/rollers that engage with the clutch assembly.

Even though I am knee-deep into a Beogram 4000 project, an opportunity came to acquire another Beocord 9000 deck.  I know that I didn't need it but I like restoring these cassette decks.  These decks are fairly easy to work on once you go through a couple of them.  I have done about eight now (mixture of BC8004 and BC9000).  You will often see them advertised on Ebay with a statement that they just need some new belts and they should work fine.  That is really an understatement.  While it is highly likely that new belts will be required, there are quite a few other things that need to be done (as seen earlier in this thread).  Regarding the belts though, in at least half of these cassette decks I have encountered, the old belts deteriorated into a black, tar-like goo.  I am guessing it is due to the units being stored in bad climate conditions.  Long term storage is always bad for audio equipment.  Especially when rubber parts are involved.  The first thing I do now when a new Beocord arrives is open it up and remove the belts...performing any cleanup if required.  That way the belt deterioration won't get any worse while waiting for me to work on it.

Here are some pictures of the deteriorated belt condition that I have found to be common here in the USA.  When you come across this scenario, it is important to go slowly and be careful with everything you touch.  The black tar gets on your hands, then transfers to everything else if you don't watch what you are doing.  I try to carefully pull off the remaining belt the best I can.  If you rub the belt it will just smear even worse on the surface it is attached to.  I use alcohol and windex to clean up the residue.  Cotton swabs and paper towels are very useful here.

As bad as the belts are melted, careful cleaning will get the surfaces back to normal.  Now this Beocord is ready to go into my backlog in good shape to result in a successful restoration.

And John, don't forget that Martin now has new rubber wheels for this series of decks! 

chartz wrote:

And John, don't forget that Martin now has new rubber wheels for this series of decks! 

Cool, even the small 12152 wheel?

Yes, everything!

I like this fix the best.  I have the same problem with a broken spring mount on my Beocord 8004.  I thought it was a result of lists of shipping and storage over the years as I haven't  tried to operate the unit since 1996 and it worked fine at that time.  After seeing all the posts here about broken spring mounts I think it is a design flaw or that the plastic mounting becomes brittle with age.  I would trust a glued repair over time.  If they break that easy it will break again.  A through bolt fix would reinforce the mount and make it better than new.