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It's a common problem and usually created by someone setting the finger and not really knowing what to aim for and it gets bent out of shape. There are two bends on the finger. The first bend is adjusted to suit that 0.02 mm gap at the 'start' when the hammers come away from the hearts. The end bend can be manipulated to turn the sliding gear tooth properly. I'm guessing by what you have said that the finger is too deep with the tooth of the sliding gear and gets jammed when trying to turn it. Also check that the sliding gear is free to turn by blowing it with a blower and you'll see how free it is and make sure the minute runner turns freely inside the bush. Again fit the runner on its own and give it a blow to see it turn freely. You may find that the runner doesn't turn because of what I have said and it may not have to do with the finger. The drawing from the tech sheet is all you need to adjust the finger properly, but as @nevenbekrievhas said, it's important you understand the theory and marry that with the practical adjustments of the chrono mechanism. -
By nevenbekriev · Posted
You can adjust the finger, no need to replace anything. But firs You need to red and understand well this -
I’ve been working on a 7750 with some success - so far not broken or lost anything and have the base movement up and running well. I’ve reassembled the chronograph mechanism and I have a problem with the minute recording. The finger on the centre wheel is at the wrong angle - it hits the minute driving wheel and the watch stops, unless I give a little nudge and then it carries on. The tech sheet says to check for 0.02mm clearance (figure B) which I haven’t got. Can I adjust the finger on the chrono wheel, or should I get a replacement? Is there anything else to consider? -
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Yesterday a Rolex cal. 3135 landed in my hands housed in a Rolex Oyster Perpetual Date reference 15200. Having analysed its running (fully wound) using @praezis excellent PCTM software, nothing is alarming or acute, nevertheless, my conclusion is that it's up for and could benefit from a service. I'd like to know if someone has a different opinion. Pictures to follow... However, what is alarming is that the rotor is loose, and unfortunately, I think it's pretty bad as the rotor won't even oscillate when the watch is in a dial-down position and gently shaken. It also makes an unpleasant metallic sound when the rotor is spinning, so I hope it hasn't caused too much damage. Unfortunately, I have not been able to confirm this visually as I do not have the correct tool to open the case back and do not want to take chances with my JAXA opener. No doubt a repair is needed, and if a repair is done a service should of course be done as well. I guess I just answered my question 🤨 After reading this thread started by @dibs1, I guess that the rotor axle is worn out and needs to be replaced. dibs1, you mention that you replaced it "using the proper staking punch". It would be interesting if you (or someone else!) could tell us a bit more about how that operation is done. I also read somewhere that "There is a brass 'bearing' or similar, in the movement that wears out and starts to leave brass shavings in the surrounding around". I have no doubt that I would be able to carry out a service but I feel a little unsure about how advanced the rotor repair is and what tools are required. So any handy tips would be greatly appreciated!
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