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Valjoux 72 Minute-Recording Jumper Adjustment

j4l3pp

By j4l3pp
in Watch Repairs Help & Advice

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j4l3pp New Member

j4l3pp

Posted
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I have a valjoux 72 with a non-adjustable minute-recording jumper.  How is the jumper tooth position adjusted to the recorder teeth to match the hammer reset position of the minute recorder?

post-573-0-96384700-1419400814_thumb.jpg

Mark Distinguished Member

Mark

Posted
Posted

As a test, take the chronograph runner out and then butt the hammer against the minute recording wheel cam. Is there a difference?

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Mark Distinguished Member

Mark

Posted
Posted

I need a picture of the chronograph runner and in particular, the finger.

When it is at zero please.

j4l3pp New Member

j4l3pp

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Runner has only one screw and 2 locating pegs. No adjustment there either.

Also, I see your question about the runner, my picture above was taken while the reset lever was being pushed...when pushed, the runner is moved away from the cam on the seconds recorder and the hammer is engaged. The heart lobes are flat against the hammer and there is no other blockage.

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Mark Distinguished Member

Mark

Posted
Posted

Have you tried unscrewing the hour recording jumper, is the hole elongated to allow adjustment. I am not sure as I don't have one here to check.

There is eccentric adjustment to allow fine adjustment of the hour recording wheel's position but this will affect the position of the teeth in relation to the runner's finger and also if you say the hammer is flat against the cam then it can't be that anyway and so the only adjustment I can think of would be the spring itself.

I know some of these have two screws securing the spring, one to loosen and one to adjust. But yours only seem to have one screw, so I can only imagine the screw hole must be elongated and if it isn't then I can't imagine.

Every one I have worked on in the past have had two screws.

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Geo Distinguished Member

Geo

Posted
Posted

I should have asked earlier. Was the watch working OK before, or has happened it since you've serviced it?

j4l3pp New Member

j4l3pp

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Came from a donor Jardur to be used for another project. Will be servicing it next, but noticed the jumper problem and no obvious way to adjust. The screw holes for the jumper are not elongated. It's a curious problem.

Geo Distinguished Member

Geo

Posted
Posted

I wonder if the hammer has been replaced before you got it. I checked one of my books and it would appear some non-adjusting jumpers had to be set up with very delicate adjustment to the hammer........with a hammer!

Check this out:-

post-124-0-54960600-1419449322_thumb.jpg

post-124-0-33311900-1419449369_thumb.jpg

j4l3pp New Member

j4l3pp

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Posted (edited)

I'm thinking you are right. I have found roughly 2 designs for the hammer. In the picture Mine is on the right, and another one is on the left. Notice the different hammer face angles. b05ba3cd0ef9f72d08319ab8958a08e5.jpg

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Edited by j4l3pp
j4l3pp New Member

j4l3pp

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So...I peened the hammer as shown to line up the jumper only to find that the hammers no longer strike evenly. The seconds hammer strikes first. At this point I had no choice but to re grind the hammer faces with numerous trial fits. I also had to adjust the angle of the minute hammer to line up the jumper again. In the end it was worth the effort. The alignment is now perfect.

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Edited by j4l3pp
Geo Distinguished Member

Geo

Posted
Posted

Very well done sir, that's what I call achievement!

I read about this quite a long time ago, but you are the first I have heard of actually doing it.

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