ETA 7750 hour recorder not resetting right

[BrehmerR]

Hello everyone!

I’m working on a speedmaster with an ETA 7750 that is having some issues. When resetting the chrono function, the hour recording wheel resest to different positions every time. I have not adjusted everything and I don’t know if this provlem was there before I took it apart and reassembled it.

below are some pictures of three different consecutive resets from the start position.

does anyone know what the issue could be. The heart and hammer looks ok to me.

1 hour ago, BrehmerR said:

Hello everyone!

I’m working on a speedmaster with an ETA 7750 that is having some issues. When resetting the chrono function, the hour recording wheel resest to different positions every time. I have not adjusted everything and I don’t know if this provlem was there before I took it apart and reassembled it.

below are some pictures of three different consecutive resets from the start position.

does anyone know what the issue could be. The heart and hammer looks ok to me.

 

It seems as though the hammer is not correctly engaging with the heart since if I push the reset pusher really hard, the hour recorder moves even more. Also there is quite alot of wiggle room in the hour recorder when the pusher is pressed with normal pressure.