13 apex chain case o ring

[ualav8]

was taking apart the chain case for a track swap and I came across this o ring. My exploded diagram doesn't show it but I think I'm looking at the first gen apex. Any idea where it goes? Anybody have a manual for a 13 apex??

 

[steiner]

That is the o ring that goes behind the locking collar.

 

[Winderallday!]

Looks like an o-ring from either the upper jack shaft or lower drive axle area of the chain case.
#61 in the snip attached goes in a groove inside collar #62, this is an oil seal for the jack shaft. I believe on earlier models, this o-ring sat in a chamfer on the side of the collar vs a groove in the collar.
The second possible location is on the lower drive axle #11 o-ring fits inside #12 collar and similarly is an oil seal for the lower drive axle. They often do not stay put when dis-assembling the chaincase and care needs to be taken when installing and using some oil on shaft/collar makes assembly easier.

 

[ualav8]

Ah! I think it's the old #61!
Thanks!

 

[Teamblue4]

o ring for the jack shaft goes behind locking collar