7s26 Pallet Fork Pivot, sticking in the Pallet Bridge - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 09-05-2015, 01:00 AM   #1 (permalink)
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Default 7s26 Pallet Fork Pivot, sticking in the Pallet Bridge

Hi Watch Tinkering folk!
I'm currently learning the art of watch tinkering by disassembling and reassembling a Seiko 7S26. I have not cleaned the movement at all or lubricated it in any way so far. That will come next.

I'm finding that when I remove the Pallet bridge, the Pallet fork remains attached to the bridge. I have to tweezer the two apart and the pivot is really gripping the jewel.

In its assembled state Pallet fork moves freely.

Through the 10 x loupe the pivot and jewel appear to be fine (but I'm no expert yet!).

Do you think that once I commence cleaning and oiling, it should free up?

Cheers,

Dan
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Old 09-05-2015, 01:19 AM   #2 (permalink)
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In my limited experience, the pallet fork and pallet bridge sticking together can cause intermittent stoppage. I would suspect too much oil is the cause for this. Try cleaning both by dipping them unto lighter fluid. If this does not fix the sticking, I recommend you just replace them.

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Old 09-05-2015, 02:34 AM   #3 (permalink)
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These bearings should be run dry, oil can cause sticktion and affect the efficacy of the pallet operation so giving them a clean is a good course of action.
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Old 09-05-2015, 03:46 AM   #4 (permalink)
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Thanks for the help. I will look into cleaning them.

Just another question, if I want to replace them how do I go about buying new parts?
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Old 09-05-2015, 06:47 AM   #5 (permalink)
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Quote:
Originally Posted by pollyc View Post
These bearings should be run dry, oil can cause sticktion and affect the efficacy of the pallet operation so giving them a clean is a good course of action.
I understand that it is taught not oil these, but the tech guide recommends an "extremely small" q.ty of "Moebius A" oil for these.

Not to say that is right, just pointing it out.

Last edited by jdm.watches; 09-05-2015 at 06:59 AM.
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Old 09-05-2015, 07:42 AM   #6 (permalink)
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Imeasure, for new parts try cousinsuk, for used parts try ramon on ebay, you can pick up 10 movements for a few quid, but as for your movement now dont lose faith keep at it ok, the sticky pivot could well be old dried oil, maybe worse case scenario it might be a bent pivot.
Parts for the 7s25 are plentiful and cheap so buy a few donor watches/movements for a few quid and youll be up and running sooner than you think.
now remortgage your house sell your kids, this hobby gets addictive and expensive mate, but most of all have fun and always ask questions ok
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Old 09-05-2015, 01:54 PM   #7 (permalink)
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Quote:
Originally Posted by jdm.watches View Post
I understand that it is taught not oil these, but the tech guide recommends an "extremely small" q.ty of "Moebius A" oil for these.

Not to say that is right, just pointing it out.
I've often wondered if that note in the tech guide is there to discourage the over-oilers out there from putting too much on (by emphasising the tiny amount that's appropriate) rather than discouraging people from leaving them dry.

If you stop to think of the life of a pallet pivot, it has very little side thrust applied and turns - intermittently - through maybe 15 - 20 degrees. That's not going to cause much wear in this watchmaker's lifetime!

On the other hand, it has to accelerate extremely fast on each impulse if it's going to transmit power to the balance, so any drag at all (even fresh oil, let alone old sticky stuff) is going to affect amplitude here. If there's enough (as you sometimes see) to pool between the jewel and pivot shoulder it becomes a very bad thing indeed!
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Old 09-05-2015, 03:18 PM   #8 (permalink)
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Interesting thoughts Joe. Thanks for that.
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Old 09-05-2015, 03:22 PM   #9 (permalink)
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Transporter, who or which shop is Ramon? I assume Ramon is the name of a person? I would love some parts movements.
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Old 09-05-2015, 03:52 PM   #10 (permalink)
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Transporter, who or which shop is Ramon? I assume Ramon is the name of a person? I would love some parts movements.
"thewatchcollector" on Ebay. Incidentally, I've sent email to their Paypal address without receiving an answer. If anyone has an alternate address I would be grateful.
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Old 09-05-2015, 04:33 PM   #11 (permalink)
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Quote:
Originally Posted by jdm.watches View Post
"thewatchcollector" on Ebay. Incidentally, I've sent email to their Paypal address without receiving an answer. If anyone has an alternate address I would be grateful.
Ramon usually responds to "Ask a question" via Ebay. Pick any item and ask a random question. It works for me

IMmeasure,
If your buying parts movements from Ramon, study the pics very closely, its a bit of a lottery.
What 7s26 is it? A/B/C?
Many parts from the earlier 70xx movements are interchangeable. with the 7S26a
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Old 09-05-2015, 05:21 PM   #12 (permalink)
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Quote:
Originally Posted by jdm.watches View Post
"thewatchcollector" on Ebay. Incidentally, I've sent email to their Paypal address without receiving an answer. If anyone has an alternate address I would be grateful.
Give him a day or two and like it was mentioned ask the question directly about a listing. Remember he is halfway around the world and he typically has around 100 listing up at once so he is usually very busy. He has never failed to answer me but often it takes him a couple of days. Ramon is great and will work with you on shipping and everything else.

I just received a package today with some used crystals to polish up and reuse and three hard to find diver bands for the 7N85 powered small case diver watches.

Michael
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Old 09-05-2015, 05:24 PM   #13 (permalink)
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Give him a day or two and like it was mentioned ask the question directly about a listing. Remember he is halfway around the world and he typically has around 100 listing up at once so he is usually very busy. He has never failed to answer me but often it takes him a couple of days. Ramon is great and will work with you on shipping and everything else.
Indeed he does answer on Ebay but having bought from him before I was hoping for a more direct communication. No problem anyway.
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Old 09-05-2015, 06:59 PM   #14 (permalink)
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He doesn't do any eBay stuff at the weekends due to family etc, rest assured he will reply to you ok, like ivorbiggon said, study the photos ok, all the movements are sold as is and not working, some are great and just need a clean and service others are shot, but never leave negative feedback as he describes all items as they are and is a top ebayer.
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Old 09-06-2015, 02:18 AM   #15 (permalink)
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Jeepers creepers that's quite the treasure trove of seiko watch parts. Thanks for all the advice. I'm probably going to be asking much more in the coming months.
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