The following describes the steps to dismantle and
relube a Kiev mount Jupiter-9 lens.
Get one of these handy rubber mats that
are intended for use in the kitchen for aiding in twisting off
stubborn jam jar lids. This makes the initial start to undoing the
threaded lens block just so much easier.
Grab a hold of the nose of the lens and
unthread the inner lens block assembly.
Unthread the assembly all the way and remove as
a unit. Make note of the spacer shim used to set the proper lens offset. When it is time to play around
with setting the working distance of the lens this shim will be increased or decreased as needed.
Set the lens on infinity.
Undo the 3 set screws around the focus ring
collar and slide the focus ring collar off.
lens still set a infinity, scribe a little mark adjacent to the
infinity mark. This will serve as a reference mark to aid in
Loosen the 6 set screws around the collar of
the lens bayonet base assembly.
Slide the whole lens bayonet base away from the
Have a look inside of the lens bayonet base at
all the dried gummed up old grease. Yuck!
Loosen the 6 set screws around the focus scale
Slide the focus scale cylinder down to remove.
Slide the focus coupling off.
retaining ring and the coil spring off.
Remove the stop screw.
Remove the two screws that are part of the
Slide off the outer helical collar revealing
the helix sliders as highlighted by Yellow Arrow.
Clean all the dry gummed up grease. I use
Lacquer Thinner as my solvent of choice to cut through the old dry
grease. Note on outer helical collar there are two grooves with a
felt fabric in them. Re-grease this part.
I find this grease to be
good for such uses. It will not creep or flow. I did this test several months ago
where I placed a dollop of grease on a sheet of glass and left it. Here are the results. No slumping or running of the grease.
There are several special dampened helical greases available
if that is to your preference.
the helix slots and slide the outer helical collar on to start it.
Do not slide it up too far as you need some space to insert the
Here is a
close-up of the helix sliders to understand just how they go
helix sliders into place. Note how the slotted face of the threaded
portion of the slider is facing inward such that you may insert a
screwdriver from the inside through the hole to secure it.
Position the helix sliders over their
respective service holes and align the outer helical collar so that
the pin corresponds to the end of travel on the slot, which is
infinity. It is a bit hard to see the pin in this image as I've
slobbered grease all over it. Slide the outer helical collar up all
the way and insert the two screws to fasten the helix sliders.
Re-grease the inner face of the focus coupling.
Do this before the next step. You'll see why.
Using you fingers, expand the coil spring to
fit over the helix assembly.
forget the retaining ring goes on last.
While holding the coil spring in place grease
up the surface.
Now you can add the focus coupling and add a
small bit of grease to allow the coil spring to slide freely. The focus scale cylinder
goes back into place and everything from this point re-assembles,
just reversing the disassembly steps.
some grease to this surface so that the focus coupling slides freely.
Your Jupiter-9 should now rotate smoothly as ever before. Now that
you have this done you may proceed to: Checking
Lens Working Distance to finish off.
I have not shown the disassembly of the lens
block and aperture selector as this particular lens was silky smooth
and clean. You'll have to wait for me to acquire another Jupiter-9
that may need for me to get right inside.
January 01, 2008