Dual Service

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KentT
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by KentT » 01 May 2014 02:33

Question? Are vinyl gloves OK to use for this job. I have a rather bad Latex allergy. I have spina bifida.

dualcan
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by dualcan » 01 May 2014 04:51

Hi Kent,
The whole idea is to prevent getting body acids onto the drive system (inner rim of platter, idler wheel, speed pulley or rotor) because body acid will deteriorate these parts over time. There is a thread which exemplifies this phenomena on a platter:
viewtopic.php?f=37&t=67689
I don't like wearing gloves not because of allergic reactions, but because it seriously hampers my ability to sense/adjust very small tolerances such as tonearm bearings. For that reason you would find me often using an industrial paper towel (hard to tear) as a "glove" and my fingers cleaned in alcohol prior to touching these things. It is far easier to remind people to slip on gloves rather than explaining every time that they must clean finger and then use paper towels and avoid etc....
If you want to use vinyl gloves or cheat as I often do, that is perfectly fine.
The whole message is to avoid acid contamination of said parts by whatever means.
BTW which unit are you working on?
Regards,
k

louye2
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by louye2 » 30 Jun 2014 11:59

Great manual! Thank you.

How do you make a new felt ring and foam ring? Where do you buy the materials? A fabric store?

Thank you.

dualcan
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by dualcan » 30 Jun 2014 18:08

Hi Lou,
Yes felt from a fabric store will do nicely. It is only an oil retainer.
Regards,
k

V15III
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by V15III » 07 Jul 2014 15:02

Wow.... thanks so much for this. Perfect!!

dualcan
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by dualcan » 08 Jul 2014 02:23

You are very welcome, and stay tuned more to come here shortly!
Regards,
k

andrewb
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by andrewb » 21 Jul 2014 02:42

Great article! My 1019 works very well (smooth, quiet, 2 minutes spin-down) with only minimal servicing from me but at some point I might tear it down like this to make it even better.

Thanks!

Jon_K
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by Jon_K » 07 Aug 2014 20:07

Extra part! A fiber washer jumped out of somewhere when I disassembled the motor. It's a thick fiber washer, redish brown in color, fits perfectly on the rotor shaft. Does it go above, below, somewhere else?

Thanks

Jon

UPDATE: Found it in the exploded diagram in the service manual. On the top shaft it goes.

Thank you for the superb write-up and photos.

dualcan
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by dualcan » 13 Aug 2014 14:51

Hi Jon,
Glad you like the guide. The washer you refer to is actually an anti-resonnace filter to further decrease the motor vibrations.
It is not in all the (round) motors and I can only surmise the premise Dual used to selectively include this resonator on an inidviual(batch?) of motors because of an increased parasitic noise, an hence the inclusion in that motor (batch). Dual of course produced all the parts for these motors in house with the possible exception of the upper and lower bells, so controlling these nuances would be fairly easy in the production centers:
http://www.dual-plattenspieler.de/gesch ... werke.html.
Regards,
k

njmpmcc
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by njmpmcc » 18 Aug 2014 22:06

Dual 1009 sk motor rebuild assistance
After I resurrected my old Dual 1009 sk and had it running and sending out a good signal (after polishing head contacts), I could hear a low rumble. Decided to started a motor re-lubrication using the your servicing manual, which covers a different Dual TT. About half way through, I have two issues.
1. With the motor apart, I found no lubrication on the bearings, dry. In addition, this bearing system used foam gaskets, not felt and the foam was almost completely disintegrated. Questions - Can I use felt instead and if so what sizes should I cut the two gaskets to since I really have no model? Also, how do you cut even holes (5 mm & ~ 9mm)in the felt/foam rings without a die cutter? It appears that the small felt/foam ring goes between the bottom piece and the bearing and the top ring between the cover and the spring. Is that so?
2. It is suggested that one remove the speed change pulley to make it easier to lube the upper portion of the rotor shaft. My pulley is seized without gripping with tools I don't want to use. Is it OK to lube the upper part of the rotor shaft without completely removing it from the motor cover?

Any help/guidance from Dual 1009 sk repair veterans (or other Dual motor repair specialists) would be appreciated.
I have pictures of the bearing assembly pieces to attach if I can figure out how to attach JPEG images. With them as one can see how they differ from those in the manual.

dualcan
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Re: Servicing Dual Continuous Pole Motors and Drive Systems

Post by dualcan » 19 Aug 2014 00:50

Hi,
The felt does not have to be a perfect fit because it will "leak" oil out to the bushing as it is supposed to do over time. You can cut a straight piece of felt and curl it around the brass bushing. Indeed the felt is directly on the bottom bell sandwiched between the bell and the clamping spring/washer. Use the sequence that is shown in Figure 12.
As far as the speed pulley is concerned, it is advisable to remove it in order to better clean the rotor shaft but, you can get around this by cleaning in different rotor positions/heights.
A good way to loosen any two metals is to heat with a hairdryer or heat gun the complete metal then use a cold spray (Freon) on the inner metal (the rotor in this case) the expansion / contraction will loosen the parts.
Regards,
k

lenovopieroit
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Re: Servicing Dual Turntables - Revision 2

Post by lenovopieroit » 07 Nov 2014 22:06

Hi, I ask for help , I fixed Dual 1011, but I do not know the combination of the colors of the wires or electric motor for 220 volts. someone can help me thank you very much .
Forgive my English , I'm Italian . :) :) :) :)

dualcan
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Re: Servicing Dual Turntables - Revision 2

Post by dualcan » 08 Nov 2014 01:47

Hi
Which colour wires are on your motor? There are a few different models of motors and wire colours.
Regards,
k

lreneat
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Re: Servicing Dual Turntables - Revision 2

Post by lreneat » 10 Jan 2015 22:57

Wearing gloves to work on turntable? I just wash my hands frequently and keep my paws off of those things I should not touch. So far so good.

Dry hands? That's why hand creams/lotions are sold in the stores. I buy these items at dollar type stores.

gus3049
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Re: Servicing Dual Turntables - Revision 2

Post by gus3049 » 14 Jan 2015 09:18

Thanks for the info guys. The service of the motor and idler wheel was very straightforward and your guide very easy to follow.

The TT is now absolutely quiet, unbelievably so in fact. The engineering on the 1019 really is solid.

Cheers.

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