Olympus BH2 Series Complete Teardown, Cleaning, And Reassembly - Page 15
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the brass shaft mount fully disengages from the
threaded coarse-focus shaft (see
important to not allow the brass shaft mount to rotate
during this step, otherwise the coil spring located
behind the brass shaft mount could become damaged if
for some reason the rotating lock ring in the pre-focus
lock mechanism is not spinning freely. Once the brass
shaft mount has disengaged from the threaded coarse-
focus shaft, carefully disengage the loop in the coil
spring behind the brass shaft mount from the stop
screw on the back surface of the brass shaft mount, and
then remove the loose brass shaft mount. A failure to
disengage the coil spring from the stop pin may damage
the coil spring when the brass shaft mount is removed.
Figure 26 – The loose brass shaft mount
The coil spring and a nylon thrust washer should both
be visible once the brass shaft mount has been
removed from the coarse-focus shaft (see
Remove the loose coil spring. The nylon thrust washer
will be removed after the pre-focus lock collar has been
removed.
Note: If the nylon thrust washer is not
present on the shoulder of the coarse-focus shaft, look
for it inside the bore of the brass shaft mount.
Figure 27 – Spring and washer under brass shaft mount
Loosen and remove the pre-focus lock collar by rotating
it counterclockwise until it comes free of the threaded
lock ring (see
Figure
28).
Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism
Figure
26).
It is
Figure
27).
Figure 28 – Loosen and remove the pre-focus lock collar
Use gentle heat to loosen the dried grease under the
nylon thrust washer, and then remove the washer using
an X-Acto® knife with a sharp blade (see
the nylon thrust washer is in the bore of the brass shaft
mount, remove it with tweezers or a dental pick.
Figure 29 – Remove the nylon thrust washer
Remove the (loose) rotating lock ring from within the
recess in the threaded lock ring (see
Figure 30 – Remove the rotating lock ring
The removal of the threaded lock ring in this step is
optional. This piece may be left on the pillar arm and
cleaned in place, if desired, or it may be removed in
order to facilitate a more thorough cleaning of the part
and the surrounding area of the pillar arm.
probably best to leave it in place since the three flat-
head screws that secure it to the pillar arm casting can
be difficult to remove. If you elect to leave it in place,
be careful with the solvent so that it doesn't damage
Figure
29). If
Figure
30).
It is
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