Guidance - 7017 Chronograph Bridge Disassembly/Assembly - Seiko & Citizen Watch Forum Ė Japanese Watch Reviews, Discussion & Trading
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Old 03-03-2019, 08:52 PM   #1 (permalink)
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Default Guidance - 7017 Chronograph Bridge Disassembly/Assembly

Okay, I did the complete tear down of my 7017-6010 Speedtimer today. I had the technical sheets for the 7016A right there with me and read them and re-read them. I was fine right up to the point where I had to disassembly the balance stop, pillar wheel, and second recording wheel (chrono wheel). The instructions stated you must be careful when removing these items to make sure the balance stop and pillar are in the open state. I took this to mean the balance stop arms are spread apart and the fingers are riding on the high side of the pillar wheel. I achieved this by taking my tweezers and engaging the pillar wheel teeth and rotating the pillar wheel to the high side cam to spread the balance stop fingers apart.

See post 7 pages 4 and 5 of the technical guide.

https://www.thewatchsite.com/34-watc...peedtimer.html

It appeared to me there was also a pinion of the 3rd wheel stickup up through the chrono plate and the balance stop end near the chrono wheel so I did not see a way to simply lift up the balance stop and slide it out. Any tips for removing the balance stop, pillar wheel and chrono wheel? After removing the balance stop screw, I ended up loosening the entire chrono bridge by removing the 3 screws holding it and gently lifted up the chrono bridge taking with it the balance stop, pillar wheel and chrono wheel.

I then gently pryed up the rear of the balance stop at which point the hole piece came off including the chrono wheel. Rather than pull the chrono wheel away from the balance stop fingers , I gently opened the fingers of the balance stop and allowed the chrono wheel to fall out.

Is there a better way to disassemble and reassemble these parts. Do I need to fix the chrono wheel to the balance stop and then drop it onto the chrono plate during the install. Any advice from experts is much appreciated. This is my first go at this. A little nerve racking.

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Old 03-04-2019, 02:33 AM   #2 (permalink)
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I did one of these years ago.



I was much less experienced than I am now (after years of school teaching).

I had to get an ex Seiko watchmaker friend to assemble the main part of the movement for me. I couldn't do it


All the best with it.
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Old 03-04-2019, 07:10 AM   #3 (permalink)
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I am pretty confident I can do the job. I just need some guidance on some of the sequencing of parts for the Chrono mechanism, balance stop, and pillar wheel prior to placing them on the chrono bridge.
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Old 03-04-2019, 03:17 PM   #4 (permalink)
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I did one of these years ago. I may be rusty but I think its best to have had the the chronograph in the run position before disassembly. So I'm guessing you now need the pillar wheel to open the balance stop lever so you can assemble the lever in position with ease. Good luck
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Old 03-05-2019, 12:04 AM   #5 (permalink)
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Quote:
Originally Posted by melt View Post
I did one of these years ago. I may be rusty but I think its best to have had the the chronograph in the run position before disassembly. So I'm guessing you now need the pillar wheel to open the balance stop lever so you can assemble the lever in position with ease. Good luck
Exactly, but it was still not easy to remove these parts. I think putting them back is going to be tricky as well. Hoping someone with recent knowledge could describe the sequence for me or provide some pics.
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Old 03-07-2019, 04:36 AM   #6 (permalink)
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I've done a few of these. From memory, the first one I did I struggled to get the chrono bridge seated.

I find the first time I work on a new movement there are always a few 'learnings'.

Here are a few pictures of a 7016 rebuild




















I don't remember any specific issues fitting the second recording wheel, the balance stop lever or the pillar wheel.
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Old 03-07-2019, 07:15 AM   #7 (permalink)
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Sir Alan - Thank you very much. Excellent pics. Do you recall having to pre-fit the chrono wheel to the balance stop with pillar wheel attached holding the balance stop arms apart and dropping this in as a unit onto the main plate? It just seems like it would be very difficult to put these pieces in individually due to what appears the third wheel pinion sticking up through the opening at the end of the balance stop. I can't see sliding individual components in here.
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Old 03-07-2019, 08:25 AM   #8 (permalink)
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The tech guides are pretty good about explaining any intricate steps- they donít mention anything peculiar about those three parts regarding assembling as a unit. It definitely sounds like you disassembled in an non-recommended manner.
Keep in mind the numbers next to each part are in order of disassembly (low to high) and reassembly (high to low), so it looks like it should go wheel, pillar wheel, lever for you when putting back together. Itís been a while since Iíve done a 701x chrono, but I think the lever should be flexible enough to flex one arm into place and then the other, before fully screwing the lever down, or possibly before even adding the screw. The third wheel pinion does not protrude through any hole in the balance stop lever, see Sir Alanís nice pictures for reference. The escape wheel pinion does, but the hole is big enough and the wheel will tilt enough that there should be room to maneuver in the manner describe above.
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File Type: jpg 037D8F1D-763E-4522-8406-AFAD51F27422.jpg (117.9 KB, 17 views)
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Old 03-07-2019, 09:01 AM   #9 (permalink)
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Reading these posts makes me want to quit my day job and learn this craft.


You guys simply amaze me.
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Old 03-07-2019, 11:49 AM   #10 (permalink)
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Quote:
Originally Posted by rileynp View Post
The tech guides are pretty good about explaining any intricate steps- they donít mention anything peculiar about those three parts regarding assembling as a unit. It definitely sounds like you disassembled in an non-recommended manner.
Keep in mind the numbers next to each part are in order of disassembly (low to high) and reassembly (high to low), so it looks like it should go wheel, pillar wheel, lever for you when putting back together. Itís been a while since Iíve done a 701x chrono, but I think the lever should be flexible enough to flex one arm into place and then the other, before fully screwing the lever down, or possibly before even adding the screw. The third wheel pinion does not protrude through any hole in the balance stop lever, see Sir Alanís nice pictures for reference. The escape wheel pinion does, but the hole is big enough and the wheel will tilt enough that there should be room to maneuver in the manner describe above.
Noah - Thank you. You are correct, it is the escape wheel pinion protruding through the balance stop. I will go slow and follow the steps in the tech guide. John
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Old 03-21-2019, 07:40 AM   #11 (permalink)
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Quote:
Originally Posted by rileynp View Post
The tech guides are pretty good about explaining any intricate steps- they don’t mention anything peculiar about those three parts regarding assembling as a unit. It definitely sounds like you disassembled in an non-recommended manner.
Keep in mind the numbers next to each part are in order of disassembly (low to high) and reassembly (high to low), so it looks like it should go wheel, pillar wheel, lever for you when putting back together. It’s been a while since I’ve done a 701x chrono, but I think the lever should be flexible enough to flex one arm into place and then the other, before fully screwing the lever down, or possibly before even adding the screw. The third wheel pinion does not protrude through any hole in the balance stop lever, see Sir Alan’s nice pictures for reference. The escape wheel pinion does, but the hole is big enough and the wheel will tilt enough that there should be room to maneuver in the manner describe above.
While I am not an expert, I wanted to post my first hand experience with installing the chrono wheel, pillar wheel, and balance stop components on the chronograph bridge of my 7017. While the tech sheet provides the order of the parts, chrono wheel, pillar wheel, balance stop; in practice I could not see any reasonable way to do this without possibly damaging the balance stop or chrono wheel as both the escape wheel pivot and 3rd wheel pivot protrude up through the chrono bridge near the balance stop position. Based on other pictures I have seen, I decided to assemble the components on the bench and drop them in as a unit.

Start by placing the pillar wheel on the bench as it would sit on its pivot. Put the balance stop on top and gently spread the arms apart to engage the pillar wheel teeth on the high side cam of the pillar wheel. You can then pick this unit up with tweezers and using another set of tweezers pick up the chrono wheel and introduce the chrono wheel into the arms of the balance stop. In the open position the chrono wheel just slides in with no resistance. If there is resistance, stop and readjust the pillar wheel orientation to the high side cam set of teeth to open the balance stop arms. Once you have the chrono wheel introduced to the balance stop, the whole unit just drops down on the chrono bridge noting the chrono wheel pinion slides down into the center wheel pinion opening. Secure with the balance stop screw and move the pillar wheel off the high side cam to the low side teeth using sharp tweezer at 90 degrees to the pillar wheel teeth. Easy enough.
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Old 03-25-2019, 09:59 PM   #12 (permalink)
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A couple of pics for reference.
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File Type: jpg IMG_0054.jpg (190.5 KB, 7 views)
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Old 03-26-2019, 06:12 AM   #13 (permalink)
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Default Guidance - 7017 Chronograph Bridge Disassembly/Assembly

I was rebuilding a 7016 last night and seemed to have no issues following the tech guide order of doing things. Maybe I was just lucky. Did you follow the guidance on page 3 or is it page 5 about making sure the pillar wheel is holding the balance stop lever in the open position? Iím only on my phone so canít see your pics well enough to know.

*edit: Iíve just done a big crop on your pic and if you compare to this pic it doesnít look like the pillar wheel is correct to open the balance stop lever. Again, only on my phone so Iím not 100% sure though.

Your pic:


My pic:

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Old 03-26-2019, 09:25 AM   #14 (permalink)
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Pippy - You are correct that the balance stop must be up on the high side cam of the pillar wheel. My whole point was to describe how the install these parts. It is much easier to pre-assemble these parts and drop them in versus trying to leaver them into position while avoiding the escape wheel and third wheel pinions stickup up past the chronograph plate.
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Old 03-26-2019, 10:14 AM   #15 (permalink)
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Ah ok, I got you now John, sorry if I misunderstood you.
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Old 03-26-2019, 11:46 AM   #16 (permalink)
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Nice work indeed.
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