TD-125 MKii Bearing Thrust plate

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machaibar
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TD-125 MKii Bearing Thrust plate

Post by machaibar » 07 Nov 2017 03:08

Hi all,

I recently acquired the above turntable and I am in the process of restoring it. Needed new plinth, and a good cleaning. Speed strobe is never steady (replaced two caps C2 and C4) have not checked it back. Any way, the bearing was bone dry and there is a indent in the trust plate and was wondering if anyone knows of a source for the plate? I want to get new belt, properly clean and oil bearing before making any speed evaluation/adjustments.

Any suggestions for a new thrust plate would be greatly appreciated.

Alec124c41
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Re: TD-125 MKii Bearing Thrust plate

Post by Alec124c41 » 07 Nov 2017 03:36

While you are looking, flip the plate over.

Cheers,
Alec

machaibar
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Re: TD-125 MKii Bearing Thrust plate

Post by machaibar » 08 Nov 2017 02:35

Thanks, good suggestion. Is easy to remove?

StephDale
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Re: TD-125 MKii Bearing Thrust plate

Post by StephDale » 08 Nov 2017 16:12

Perhaps not easy to remove, no. The Thorens players of my experience do not have removable thrust pads, but replacements can be dropped down the bearing tube as required.

I've used both PTFE and 'Widia' (tool steel) inserts to 'tune' bearings. The latter was a part available from Thorens and included as standard in their later, better players (TD520 Professional and up). I confess I'm not 100% sure I've cracked the potential lubrication/earthing issues with using them (first turntable was only fitted with one a few weeks ago). The PTFE pads seem to work okay although you do need to ensure you've using a good quality additive-free synthetic lubricant with them (Mobil 1 0w-40 as used by Michell works well).

PTFE pads from SRMTech in the UK:
http://srm-tech.co.uk/epages/4c008923-2 ... ducts/SSP1
Widia from Fred Hifi in France:
'Fonde de Palier 10mm' on this page: http://www.fredhifi.com/crbst_1_en.html

If your 'table has a ball-bearing at the end of the shaft, or insert bearings these may not/probably won't work, so if unsure don't try it!

Steph

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Re: TD-125 MKii Bearing Thrust plate

Post by rkay5 » 09 Nov 2017 02:00

The hard metal thrust bearing will work with the older TD125 and TD150 with ball ended bearing as I used one in a TD150 the Thrust bearing up great is a must do you will be happy with it.

machaibar
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Re: TD-125 MKii Bearing Thrust plate

Post by machaibar » 09 Nov 2017 04:14

Steph,

Thanks for those links. Really helpful. The TD 125 MKII that I have has a ball bearing at the end of the spindle shaft and uses what looks like a hard metal thrust plate from looking at it - shiny where the indent is.

So I think it will work. Not sure about the PTFE plate, however. This seems like a softer material?

Regards.

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Re: TD-125 MKii Bearing Thrust plate

Post by machaibar » 09 Nov 2017 04:16

Robert,

Thanks for the feedback. I am leaning towards the hard metal plate as it seems like that was what it has now.

I'm assuming I just drop it over the existing one.

Regards,

StephDale
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Re: TD-125 MKii Bearing Thrust plate

Post by StephDale » 09 Nov 2017 09:39

The only issue to check with the hard insert is that they're thin enough to slip between the existing thrust pad and the bottom sintered bronze bearing insert if the insert isn't fully down in the bearing tube.

If that happens the ball on the end of the shaft ends up resting on the edge of the new thrust plate, which will increase noise and also has the potential to push the spindle off to one side of the bore which will increase wear.

There is info on this on the Fred 'site but you'll have to dig around. They do a rescue kit if you find your bearing is one of those affected, but it involves cutting the bottom off the bearing tube and fitting a new thrust bearing cup. Undoubtedly effective, if a little hair - raising!

Otherwise the inserts work well, and I think I sorted the lubrication; go with a good quality synthetic, such as the Mobil 1 I referred to earlier.

Steph

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Re: TD-125 MKii Bearing Thrust plate

Post by StephDale » 09 Nov 2017 09:56

I realised I haven't answered your questions!

PTFE is certainly softer, but has very low friction. It will therefore flow around the ball or shaft point until the bearing is supported by the surface area in contact. They work fine; I had one in a TD160 for ten+ years when I had to replace the thrust pad and didn't know where to get the steel ones from. They're a good bit thicker than the steel ones too, so can't slip under the bronze bearing insert if your bearing has the problem I described in my previous post.

In either case you just drop it down the bearing tube. The Fred ones come with a little insert tool which must Help when placing the insert in one of the earlier sintered bronze bearing turntables.

In either case I use kitchen towel and Isopropyl Alcohol / Isopropanol to clean out all the old oil from the bearing well and also the shaft. Once it's dry and clean a pin - head sized drip of oil is put down the shaft to seat the insert. Then drop down the insert. Once it's in place, a little pressure will hold it in the bottom of the tube by capillary action. You can now load the oil in the bearing and fit the platter. With luck, the platter will take an age to settle in the bearing and eject a small amount of oil when it's completely down; that way you know the bearing is fully oiled.

Then it's play time. Don't forget to adjust the tonearm height...!

Steph

machaibar
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Re: TD-125 MKii Bearing Thrust plate

Post by machaibar » 10 Nov 2017 04:20

Steph,
Thanks for all the great tips. I went ahead an ordered the hard plate from FredHifi, but the site does not have the US listed as a country in the shipping address even though there is a button the site for US. If this does not pan out I will order the one from the British site.

Thanks again.

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Re: TD-125 MKii Bearing Thrust plate

Post by tnsilver » 05 Dec 2018 12:22

Replacing the thrust plate on a TD-125 Mk-II isn't easy. It involves extracting the soft stock bronze bushings, which for all intents and purposes means ruining the bottom one (for sure) and likely the top one too. A pair of new replacement bushings is required. I've used an improvised bushings extractor that I made for this job, and it still wasn't easy:

https://i.imgur.com/PJZqh3H.jpg

Then, you need to get the stock nylatron thrust plate out of there. I used a piece of sticky double sided tape on a wooden rod to stick to it and pull it out. I just needed to clean off the oil residue so the tape would actually stick to the nylatron.

My favorite thrust plate is PTFE (teflon) backed by stainless steel:

https://i.imgur.com/Ka6oLJ4.jpg

I've used 2mm PTFE so the bearing shaft can burrow into it but there's always a thin sheet of teflon right between the tip of the shaft and the stainless steel plate under the teflon.

It goes in like this:

https://i.imgur.com/PlI3SoK.jpg

https://i.imgur.com/vl1LTbY.jpg

https://i.imgur.com/jhDsHOh.jpg

and then the top bushing goes in like this:

https://i.imgur.com/aFLRFKd.jpg

https://i.imgur.com/FwMd1WU.jpg

Finally, you'll have to JBWeld the bearing to the TD-125 deck, because the original mounting is a press fit and once it's out, there's a small gap you'd want to fill in.

It works like a charm now:

https://i.imgur.com/D53P9Rw.jpg

Ottermel
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Re: TD-125 MKii Bearing Thrust plate

Post by Ottermel » 06 Dec 2018 18:16

You certainly have a different platter, not the original!

tnsilver
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Re: TD-125 MKii Bearing Thrust plate

Post by tnsilver » 07 Dec 2018 01:26


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