Beogram 3000 Type 5228 too slow

33 replies

Hi,

I inherited this beautfil turntable from my father. He bought it new in the 70's and it has been in their home (in a warm room) until I got it. The turntable stood unused for 20 years.

However, it does suffer from the same problem with the bearings I read about many times on this site. Before I realized that, I bught a new idler wheel and rubber belt as the rubber on the old idler wheel was hard and it gave a rubbing noise when pressed against the step puley.

I disassembled the motor according to the nice walk through that I found on this site. I put the bearings in acetone for 24h in order to dissolve the old gunk. There was plenty of gunk/dirt in the acetone when I was finished.

After that I prepared the oil infusion process by filling a small transparent glass bottle half way with SAE30 oil (Castrol Classic XL 30 - SAE30, https://www.oliebiksen.dk/shop/castrol-classic-xl-2660p.html). I fitted a wine vacuum plug and made a vacuum. Then the air started to free from the bearings - that process went on for several hours. The bottle was kept in the oven by 80 degr. C. Another 24h later I released the vacuum and removed the bearings after a couple of hours.

While infusing the bearings, I also soaked both "felt rings" in oil:

(picture taken before the oiling process)

Everything went fine so far. So I fitted everything backwards and adjusted the step puley so the 33 rpm mode could touch the widest part of the puley (for maximum speed if needed).

I have now tried the turntable over several days and the symtoms are all the same: It starts up too slow at about 30-31 rpm. After 25-30 min. it can go up to 33 1/3 rpm (and higher), which of course tells me that something is still wrong. However, I don't think there is too much friction in the motor, because when I cut the power (idler wheel not touching the puley), it doesn't stop immediately but keeps going a couple of seconds before stopping. Also I can very easily spin it with my fingers.

So, do you have any clue of what I should do now?

I have some suggestions myself (but I would really like your opinion instead of shooting in blind):

* Wrong oil used

* Infusing process gone wrong

* Misalignment of the bearings (how can I tell?)

* Maybe the felt sourrounding the bearings should be replaced? Should I also clean those with acetone?

* Some other parts of the turntable? But everything is moving very smoothly - also the little nylon piece on the speed adjustment arm is still on 

I really hope someone can help me here :)

 

Best regards from Denmark,

Kim

 

 

I will respond to my own post. I read in another thread, that Dillen also suggested that the felt reservoirs should be cleaned in acetone and soaked with oil. Although I already soaked them in oil, I let them dry/drip off on a piece of paper afterwards for some hours. Probably not so clever.

So maybe I should give the felt rings another try:

1) Cleaning in acetone

2) Drying process

3) Thorough oil bath and immediatly fitted in the bearing housings

Hi Kim

My opinion would be not to disassemble the motor again, the felt washers are filled with oil and have no contact to the bearing/spindle of the motor, as you siad it runs after disconecting from mains for a few seconds, that's a good sign for a good alignment and asembling of the motor.

You wrote that you adjusted the stepped pulley to maximum but maybe there is a little more to lift,

My suggestion would be to check the hight of the stepped pulley to the maximun of 45 RPM, when the speed adjusting is turned  to maximun speed, without making noise.

Look for the lever that moves the idlerwheel up and down, at it's tip where it goes into the gap of idler should be a small piece of plastic that reduces the gap and the friction to the idler. Without this plastic tip the idler can move a little bit up and down.

Next to mention is that there have to be 50 and 60 Hz stepped pulleys or a different wheels, where the 60 Hz pulley is a little bit smaller.

Looking for that:

/forum/beogram/bg-1202-50-to-60-hz-mexico

So take your tour and let us know how you get on the the speed issue.

Stay healthy and best bestregards

Christian

I have had this problem on a few BG120x and BG3000 TT's.

The solution was to carefully disassemble the Voltage Selector switch, and clean off the oxidization from all the brass selector contacts.

Wipe gently and repeatedly with cotton wool dipped in Brasso, or similar Metal Cleaner.

Definitely do NOT sandpaper, or file the contacts.

Afterwards, spray correct Electronic Contact Cleaner (Kontakt 60), and Reassemble.

Be careful to not lose the tiny spring, or ball bearing.

M Yachad

Location: Jerusalem

My B&O Icons:

Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beomaster.png Beomaster.png
Beogram-400x.png Beogram-400x.png
Electronics Technician in Jerusalem Israel. B&O fan for over 50 years.

Hi Christian,

Thank you for all suggestions and link - I didn't see that one earlier.

Re. felt washers - I remember them being quite hardened, but maybe that doesn't matter.

I didn't try the 45 RPM setting very much, but I visually inspected that the idler wheels reached the widest part of the puley when speed wheel was at the fastest position. I will have a look again.

But in fact when the turntable was run for > 25 min. the speed was correct - in fact it was necessary to turn down the speed in order to not exceed 33,33 rpm. It was just slow getting up to speed.

The small rubber piece on the bronze lever i still there and I already cleaned the dirt.

The unit is 110-240V and 50Hz. It says "GR 3000 - TYPE 5228 SERIE 05" and "No 25307"

Thanks again,

Kim

Hi Menachem,

That was also interesting. I didn't read about that before. The voltage selector was never touched before, I believe, but I will definitely check it and spray with contact cleaner.

I will write back.

Thanks, Kim

Remember that these machines are ALL working on ONLY AC power.

There is no electronic motor stabilization circuitry.

Therefore the AC current must flow absolutely freely, directly to the motor.

Any interference (such as oxidization on any contacts) will directly impede optimum motor performance.

The contacts MUST be cleaned of ALL oxidization, BEFORE using Contact Cleaner, otherwise the problem will reoccur in the future.

Do it once, do it right!

Location: Jerusalem

My B&O Icons:

Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beomaster.png Beomaster.png
Beogram-400x.png Beogram-400x.png
Electronics Technician in Jerusalem Israel. B&O fan for over 50 years.

Ok, so I'm trying to figure out how to open the voltage regulator without breaking it, but I can't seem to find a way. Here are some pics:

Top:

Bottom:

Thanks for your time.

I removed the motor again and made a small video clip to show the very easy movement of the pulley. But is it supposed to be moving freely up/down when I pull it?

Please see video clip: https://youtu.be/VZ0ZzZsaUb8

OK, so you're looking at the top side, which shows the 220 and 110.

In the center is a small plastic clip, which holds that cover on.

Pinch it to one side, and that cover will pop off.

So will the ball bearing and spring also jump out, so be ready to catch them.

Location: Jerusalem

My B&O Icons:

Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beomaster.png Beomaster.png
Beogram-400x.png Beogram-400x.png
Electronics Technician in Jerusalem Israel. B&O fan for over 50 years.
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