I should have added that the front group MAY unscrew without any
problems. If so, then all that remains is the disassembly of the
diaphragm plate, thorough degreasing and rebuild.
___________________________________
John Hermanson | CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121 | www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html
John Hermanson wrote:
> Remove front lens assembly, remove mount. There are (I think) 4 screws
> accessible from the back that hold the diaphragm assembly plate in.
> From the front, diaphragm cam, and some springs and levers may have to
> come out first. The hardest part MAY be simply unscrewing the from
> group. No set screws, just that many appear to be glued in. Even in
> the 80s, I watched Japanese techs (with 300/4.5 in a full size vice)
> with giant spanners trying to unscrew the front tube. It never budged
> even after liquid wrench, alcohol, acetone, every solvent under the sun
> was applied. Spanner eventually broke. Not really a do it at home job.
> ___________________________________
> John Hermanson | CPS, Inc.
> 21 South Ln., Huntington NY 11743
> 631-424-2121 | www.zuiko.com
> Olympus OM Service since 1977
> Gallery: www.zuiko.com/album/index.html
>
>
> Chuck Norcutt wrote:
>> Anyone have suggestions for disassembly of the 300/4.5 to clean up an
>> oily diaphragm? Someone I know (not on this list) has one and asked if
>> I had any tips for cleaning it. I gave him the parts list and exploded
>> assembly diagram and an old note from Clint that says the whole
>> diaphragm cage is to be removed as an assembly. But Clint's note didn't
>> say anything about the best way to get in.
>>
>> Chuck Norcutt
--
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