Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 34 of 40
Figure 107 – Gear pins holding both gears
Use a 1.3mm Allen tool or driver to loosely reinstall the
two M2.6X4 setscrews to secure the gears onto the gear
pins. If necessary, readjust the positioning of the two
gear pins such that there is an equal amount protruding
from each side of the focus gearbox housing and then
tighten the two setscrews to secure the gears onto the
gear pins (see Figure 108).
Figure 108 – Reinstall two setscrews to secure the gears
Reinstall the Focus Gearbox
Apply fresh grease to the teeth of both gears of the
focus gearbox, rotating them as necessary to ensure
complete coverage of all the gear teeth.
Note: Be sure to omit grease from the teeth of the
small-diameter side of the second gear if grease was
omitted from the brass focus rack, since the small-
diameter end of this gear meshes with the brass focus
rack (see Figure 109).
Figure 109 – Apply grease to the teeth of both gears
Apply a small dab of grease between the two mounting
holes on the mounting flanges of the gearbox housing.
Place the two brass shims into position, allowing the
grease to hold them in place while you reinstall the
gearbox into the pillar arm (see Figure 110).
Figure 110 – Stick shims onto flanges with dabs of grease
Hold the focus gearbox up to the mounting surface of
the pillar arm casting and align the four holes in the
mounting flanges with the four tapped holes in the
pillar arm casting (see Figure 111).
Figure 111 – Hold focus gearbox to the mounting surface
Use a 2.5mm Allen tool or driver to loosely reinstall the
top two M3X10 hex socket-head cap screws and lock
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