HEINZ JAUCH GF clock issue

[John P]

Hello, I am repairing this grandfather clock for a friend. I has a #77 movement made in 1974.
It came in missing the pendulum hanger and suspension spring. It also had bushing problems with the output shaft that drives the cam for the chime, and the star wheel arbor bushing (rear plate). I also replaced the verge pivot bushing in the pendulum hanger post.
Having finnished all needed repairs, and secured parts, the clock is running but has very little pendulum swing or amplitude. (1.75 inches).
Is this normal?

Also, in the picture below, can someone explain the function of the tang that is riveted to the pendulum hanger and how is it properly set? Is it a fine adjustment for beat setting?

Thanks
John

 

[R&A]

After bushing the verge , you may have change the depth and I would check there first to increase your swing. If the clock keeps good time, it may just have a short swing. As far as the pendulum hanger. That piece that you can move back and forth. This is what you use to put the clock into beat. It shifts the hanger instead of moving the verge itself.

H/C

 

[John P]

H/C I am confident that the verge is running as deep as posible without stalling as I have spent much time there. You may be right, it could be a short swinger.

Thanks

 

[leeinv66]

Having finnished all needed repairs, and secured parts, the clock is running but has very little pendulum swing or amplitude. (1.75 inches).
Is this normal? John

Mine has twice that amplitude. How much weight do you have on it?

 

[shutterbug]

You might have your bushing in the anchor too tight or not exactly straight. Or you might have a bent pivot on the anchor arbor (easy to do while disassembling). Is this the dead-beat type or the recoil?

 

[John P]

The movement is recoil escapement. I have 3 weights (1 heavy and 2 light) but im not sure where they go.

john

 

[The Tick Doc]

The movement is recoil escapement. I have 3 weights (1 heavy and 2 light) but im not sure where they go.

john

John the heavy weight hanges on the far right , it runs the chime side, good luck...............TTD

 

[Willie X]

John,

Sounds like you have repaired the 'usual suspects'.

The pendulum swing should be 3 inches or more. Double check the end shake and make sure your new bushing has proper clearance. You should see obvious lateral movement to the pivot using a 10X magnifier. Crutch to pendulum leader should also have some free movement.

Check for wear at the hand-shaft, front and back plate.

Check for 'dents' in the pallets.

Max depth is not always the best adjustment for the pallets. About 15 thou drop, equal on both pallets, is about right for this one.

Good luck, Willie X

 

[John P]

Gentlemen, after some minor adjustments we are happy to report the Jauch GF clock is running right. Nice 3 inch swing, nice tickie tock, no pendulum wobble and keeping perfect time.

Thanks again
John

 

[shutterbug]

Gentlemen, after some minor adjustments we are happy to report the Jauch GF clock is running right. Nice 3 inch swing, nice tickie tock, no pendulum wobble and keeping perfect time.

Thanks again
John

Don't keep us in suspense, John! What did you do to correct it?

 

[John P]

Shutterbug, I think I was trying to run the pallets too deep chasing after a more robust swing. It would run that way but was very sensitive to a beat adjustment, just couldnt get it to that sweet spot. Raising up the verge a bit at a time untill I found too high, then back down 2 clicks.
Runs like a swiss watch.

John

 

[shutterbug]

Shutterbug, I think I was trying to run the pallets too deep chasing after a more robust swing. It would run that way but was very sensitive to a beat adjustment, just couldnt get it to that sweet spot. Raising up the verge a bit at a time untill I found too high, then back down 2 clicks.
Runs like a swiss watch.

John

Dang! So Willie was right again Glad you got it running though!

 

[eskmill]

The movement is recoil escapement. I have 3 weights (1 heavy and 2 light) but im not sure where they go.

john

BOING ! The Jauch 77 movement has a DEAD-BEAT escapement and must not be adjusted to cause recoil.

A recoil escapement reverses the direction of the wheel train at the extreme of escapement action. 'Doesn't make much difference on a simple spring powered movement with big pinions, but on a highly efficient movement any recoil will stall the escapement due to the high wheel-pinion ratio.

A mis-adjusted dead-beat escapement will attempt to recoil and seemingly work well with no pendulum load.

Obviously you've fixed the problem by adjusting-out the recoil.

 

[John P]

Eckmil, you'r right, I have no recoil of the escape wheel. Its keeping good time and the beat is right. This was my first 77 movement to repair and it has been a learning experience. I kinda figured that after my beat adjustments would not work. There was very little space between the tick and the tock and too much silent time. (if that makes sense) We've worked thru it and thanks for the input.

John<- deadbeat enlightened