Tools required:

thin blade / knife

fine tweezers

contact cleaner (e.g. servisol 10)

helping hands

fine nose pliers to replace circlip

Singer oil.

A trip to Maplin or other electronics store will be beneficial.

Firstly remove the back end carefully with a sharp knife. You are not cutting but levering here - I normally move to the back of the blade...

The brushes

Remove the circlip and washers...

Front bearing to be relubed...

Rear Bearing to be relubed... Just visible but recessed.

The shaft - I normally give a clean and remove the washer at the bottom and clean this too. Then a dab of oil.

The fidly bit - Reinsert the rotor into the motor body, making sure any washers are present. Add the one or two washers to the end and then line the circlip up with its groove in the motor shaft. Very carefully squeeze back on with pliars. Do this in such a manner that should the thing ping off it can't go far because finding one of them in the carpet is not fun!

The brushes will have likely crossed over. At this point use some fine tweasers to reverse them and open them up. Then I have a rolled peice of paper ready and insert from the rear through the access hole. Release brushes and allow them to sit against the paper - whilst the paper is allowed to open up in the hole. This is a good opertunity to spray contact cleaner onto the paper and clean the brushes by rolling a few times not against but with the direction of the brushes.

Place rear plate back on the motor making sure to line the raised buts it should now click in place slowly revolving paper whilst you withdraw..

.

Simple job just a little fiddly - Take your time!

At this point I normally run for a while on my bench supply to establish everything is ok...

Edit to add a couple of bits of info...

Superb step-by-step(1) instructions Olly!

My motor doesn't look like this at all! Oh well...

By the way, I used a hollow plastic Q-tip rod which I cut off to do the brush job (the axle just fits in), but paper seems much safer... Good idea Olly!

Is yours a Maxon Jacques? Maybe ask Martin but I wonder if yours was swapped at some point in the past? I am sure they would have been quieter when new but IMO the plastic definately adds resonance to any noise!

I have sent the details about replacement motors to Martin so will be interesting to see what he has to say on the matter.

Here you go, sorry about the quality!

Hi Jacques yes you make a very good point there. A very good way of ensuring the screw thread is ok is to measure the motor current as it traverses. Seeing a nice low current and more importantly an even current drawn across the range is a good way also make sure that the angle bracket holding the bearings is square. Teflon oil is good on the plastic bearing.

I think anyone can get these decks running in about an hour but it takes a heck of a lot longer to set them up for optimum performance! Another thing I have recently noted is that it can be beneficial to strip the main horizontal ball race bearing... I know it is a big job & rewire (you could use the old enamled wire but I prefer to replace I know less likely to snap and easier to re-guide long strands) but there is no way of knowing how free the ball race's are until you pull it apart - one I recently did was clearly not performing as freely as it did after I had stripped and relubed - but it is not really possible to tell looking at or manipulating the arm! Seriously the more I work on these decks the more I see needs doing to them!

Superb instructions!

I will go for a trip to Maplin for suppies then give this a try over the holidays.

Ill report back with pics.

Thanks again all

Tom

Step1 wrote:

 

Firstly remove the back end carefully with a sharp knife. You are not cutting but levering here - I normally move to the back of the blade...

So that's how it's done!  Outstanding procedure - I'm not sure I would have the guts to try.

Done it twice, don't be put off. You just need à steady hand!

I've just finished replacing the complete switch assembly on my Beocord 2200 and this was difficult!

chartz wrote:

Done it twice, don't be put off. You just need à steady hand!

I've just finished replacing the complete switch assembly on my Beocord 2200 and this was difficult!

Too late now, Benny Amina replaced my BG4002 motor last summer.  Hopefully it will be many years before I have to do that!

On the other hand, I should have my BC5000 Type 4716 tomorrow....

Hey hey hey, 4716, same as mine!!