Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 17 of 40
Once the brass gear-retaining ring securing the three
gears in the gear cluster has been removed, the three
loose gears may then be removed from the gear-
support base for cleaning (see Figure 36).
Figure 36 – The gear-retaining ring has been removed
Remove the top (right-most) drive gear from the gear-
support base first (see Figure 37).
Figure 37 – Remove the top (right-most) drive gear
Next, remove the middle drive gear from the gear-
support base (see Figure 38).
Figure 38 – Remove the middle drive gear
Finally, remove the bottom (left-most) drive gear from
the gear-support base (see Figure 39).
Figure 39 – Remove the bottom (left-most) gear
Clean the old grease from the three gear holes in the
gear-support base and from the support pins and teeth
of all three drive gears. The gear-support base attaches
to the coarse-focus knob via three M2.6X5 pan-head
screws and three starred lock washers, as shown in the
rear view of the coarse-focus knob (see Figure 40).
Note: Removal of the gear-support base is not required for this
procedure but is included here for the sake of completeness.
Figure 40 – Rear view of the right-hand coarse-focus knob
To remove the gear-support base (with the attached
coarse-focus shaft) from the coarse-focus knob, use a
suitable JIS screwdriver to remove the three M2.6X5
pan-head screws and washers, and then separate the
gear-support base, with the attached coarse-focus
shaft, from the plastic coarse-focus knob. The brass
coarse-focus shaft threads into the back of the gear-
support base and is staked in place with adhesive.
These two components should not be separated unless
absolutely necessary. If it ever becomes necessary to
separate the brass coarse-focus shaft from the gear-
support base, be sure to first soften the adhesive by
thoroughly heating the bonded pieces before loosening
and removing the coarse-focus shaft. While gripping
the hollow coarse-focus shaft during removal from the
gear-support base, be careful to not scuff or flatten the
shaft.
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