What movement is this? (Rotor problem)

[coneman72]

What movement is this? (Rotor problem) (Solved)

A colleague gave me a cheap TH replica to repair.

What movement is this?

Without the rotor:

The problem: the rotor rotates freely a half turn and then locks

What should I check?

Thanks!

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[ThinkBachs]

I'm no movement expert by any means, but if it were me, I'd put a drop of watch oil on the bearings to see if that make any difference.

 

[SSTEEL]

Looks like a 21J. What complications does this Tag have, if any? As to the rotor, ensure its fitted correctly to the circular/flat side fitting.

Check the underside of the rotor to see if its catching/rubbing anywhere which is restricting its full rotation.

 

[coneman72]

Looks like a 21J. What complications does this Tag have, if any? As to the rotor, ensure its fitted correctly to the circular/flat side fitting.

Check the underside of the rotor to see if its catching/rubbing anywhere which is restricting its full rotation.

Only the rotor problem: rotates freely a half turn and then locks...

If I wind it manually, it works without problems.

 

[Ko67]

A broken or damaged tooth on one of the reverser / winding transfer wheels in the automatic winding system would behave just like that. The rotor can turn until the gears hit the damaged tooth and then locks up. I suspect that it will turn the other way until it locks again, right ? No way to know for sure without checking those wheels .

 

[coneman72]

A broken or damaged tooth on one of the reverser / winding transfer wheels in the automatic winding system would behave just like that. The rotor can turn until the gears hit the damaged tooth and then locks up. I suspect that it will turn the other way until it locks again, right ? No way to know for sure without checking those wheels .

Thanks for answer!

Today I will take apart the auto-winding system to check the gears.

 

[coneman72]

I finally found the problem: the movement had lost a piece of rubber that came out of the pushers. The loose piece inside the movement, stopping the rotor...

Pusher with rubber

Pusher without rubber

The problem

Case closed