Link to Relube Instructions for the Jupiter-3

[Sonnar Brian]

I've posted an illustrated narrative on Disassembling and Lubing the Jupiter-3 LTM focus mechanism.

http://ziforums.com/showthread.php?p=1801#post1801

This is about a 1 Hour Job, and makes a world of difference for "sticky/uneven focus".

 

[jmkelly]

Thank you, Brian - thorough and easy to follow. At least half the J-3's I have ahd in my hands have been gummed up with something - maybe bearing grease, maybe beef tallow 😉. Absolutely, cleaning this gum out and re-lubing with a modern synthetic makes a huge difference!

 

[Sonnar Brian]

What I'm really proud of on this one - getting rid of the 1mm play in the focus. I replaced the undersized guide screws that hold the helical together, and the 1mm play in focus was pretty much gone.

.

 

[oftheherd]

Thanks Brian. Do the other Jupiter 50mm lenses work about the same?

 

[DanOnRoute66]

Have you by chance posted instructions on how to lube a J-9? I have one that is really good optically but it takes almost both hands to turn the focus. I suspect it has the FSU-lubricant-has-turned-to-epoxy syndrome.

 

[Sonnar Brian]

The Jupiter-8 is much different, and easier to relube. HOWEVER: not as much flexibility in making RF, focus, and distance scale agree.

Kim Coxon has posted excellent instructions on relubing the J-8 and others on his site.

http://pentax-manuals.com/repairs.htm

 

[Sonnar Brian]

Have you by chance posted instructions on how to lube a J-9? I have one that is really good optically but it takes almost both hands to turn the focus. I suspect it has the FSU-lubricant-has-turned-to-epoxy syndrome.

AHA! Kim Coxon site again! Jupiter-9 Lube instructions that I used.

 

[DanOnRoute66]

AHA! Kim Coxon site again! Jupiter-9 Lube instructions that I used.

Sweet! Thanks!