Aqua Terra 2503.50 and broken hacking function

leafy · Jun 23, 2020

Hi,

I've been looking for a 2503.50 for a few months now and I came across a really nice example at a good price.

Unfortunately the hacking function doesn't work and the seller doesn't recall when it last functioned properly. Seller says it was last serviced 5 years ago. It's keeping good time -10/+10.

Does repairing the hacking function typically require a full-service? Or is that issue typically isolated, and repaired by itself, without a full service on the movement.

Thanks!

Archer · Jun 24, 2020

leafy
Does repairing the hacking function typically require a full-service?

No. Here is a 25035000 with the case back off...

Here I have removed the automatic winding module...

Right under that module, you can see the part that provides the hacking function - called the balance stop lever - at the red arrow...

The only thing holding this part in place is the automatic winding system being screwed in place, so when someone who may not be too familiar with this movement, or may not be too careful, removes the automatic system, they could easily lose the balance stop lever. There is also a chance that when the were assembling the movement, they may have set this lever is place and then when they placed the automatic parts they disturbed it, so it may not be installed properly.

This part is specific to the 2500 series of movements, so trying to use one from a Cal. 1120 or ETA 2892 (the movement the 2500 is based on ) will not work. If the person who last performed the service didn't have access to Omega parts, they would not be able to replace a lost or damaged stop lever. I would also say they likely didn't service the movement right if this doesn't work properly, so although it would be a simple fix, you should consider getting a full service by someone who knows how to service these watches properly (has been trained directly by Omega), and has access to the parts and proper tools needed to service these in the right way.

Cheers, Al

chaw6125 · Jun 24, 2020

Interesting. I have had the stop lever missing in a longines branded 2892 but think it was common on that caliber. I didn't realise it was different on the 2500 though. Although not too surprising considering how different the plates on the 2500 are to the 2892.

Great pictures as always Al.

Archer · Jun 24, 2020

chaw6125
Interesting. I have had the stop lever missing in a longines branded 2892 but think it was common on that caliber. I didn't realise it was different on the 2500 though. Although not too surprising considering how different the plates on the 2500 are to the 2892.

Great pictures as always Al.

Every version of the 2500 uses a different stop lever, so there are 4 different stop levers for the 4 versions of that movement...

Only the 2500B uses the standard 1120 stop lever - every other version uses a lever for that specific variant of the 2500. So you can't mix and match any of them.

leafy · Jun 24, 2020

@Archer - Appreciate the thorough explanation. The suggestion on getting a full service as the last one may not have been done properly makes sense.

I’ll probably skip this and wait for a better example then.

Thanks again!

Foo2rama · Jun 24, 2020

Archer
No. Here is a 25035000 with the case back off...

Here I have removed the automatic winding module...

Right under that module, you can see the part that provides the hacking function - called the balance stop lever - at the red arrow...

The only thing holding this part in place is the automatic winding system being screwed in place, so when someone who may not be too familiar with this movement, or may not be too careful, removes the automatic system, they could easily lose the balance stop lever. There is also a chance that when the were assembling the movement, they may have set this lever is place and then when they placed the automatic parts they disturbed it, so it may not be installed properly.

This part is specific to the 2500 series of movements, so trying to use one from a Cal. 1120 or ETA 2892 (the movement the 2500 is based on ) will not work. If the person who last performed the service didn't have access to Omega parts, they would not be able to replace a lost or damaged stop lever. I would also say they likely didn't service the movement right if this doesn't work properly, so although it would be a simple fix, you should consider getting a full service by someone who knows how to service these watches properly (has been trained directly by Omega), and has access to the parts and proper tools needed to service these in the right way.

Cheers, Al

😉

Aqua Terra 2503.50 and broken hacking function

leafy

Archer

chaw6125

Archer

leafy

Foo2rama

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