Olympus BH2 Series Smontaggio, pulizia e rimontaggio completi - Pagina 27
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and seat the washer onto the end of the brass pinion
mount (see
Figure
83). The grease will hold the nylon
washer in place on the end of the brass pinion mount
during the subsequent assembly steps.
Figure 83 – Reinstall nylon washer onto end of pinion mount
With the pre-focus lock collar loosened, rotate the
rotating lock ring until the stop screw is at
approximately the 11:00 position. Rotate the lock collar
clockwise to snug the rotating lock ring at this position.
Now place the coil spring over the brass pinion mount
and engage the rear loop of the spring with the
outward-facing stop screw on the rotating lock ring (see
Figure
84).
Figure 84 – Place the rear loop of spring over stop screw
Thoroughly clean the old grease from the brass shaft
mount. Grasp the coarse-focus knob on the right-hand
side of the pillar arm and withdraw it slightly, just to the
point where the threaded coarse-focus shaft protruding
from the left-hand side of the pillar arm no longer
protrudes. Hold the brass shaft mount up to the nylon
thrust washer on the brass pinion carrier, with the rear-
facing stop screw at approximately the 3:00 position.
Carefully engage the front loop of the coil spring with
Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism
the rear-facing stop screw on the back of the brass shaft
mount, making sure that the rear loop of the spring
stays engaged with the outward-facing stop screw on
the rotating lock ring (see
Figure 85 – Place front loop of the spring over stop screw
The next step is to preload the coil spring.
holding the brass shaft mount against the nylon thrust
washer on the end of the brass pinion carrier, carefully
rotate the brass shaft mount clockwise until the stop
pin on the back side of the brass shaft mount contacts
the stop pin on the rotating lock ring, preventing the
brass shaft mount from rotating further. Then pull the
brass shaft mount away from the nylon thrust washer
just enough to allow the stop pin on the brass shaft
mount to cross the stop pin on the rotating lock ring.
Once the stop pins cross, press the brass shaft mount
up against the nylon thrust washer once again. The coil
spring is now pre-loaded, and from this point on it is
important to not allow the brass shaft mount to rotate
any significant amount, otherwise the coil spring could
become damaged.
While holding the brass shaft mount stationary in this
position, reach around to the right-hand side of the
pillar arm and gently press the coarse-focus knob in
slightly, so that the threaded end of the coarse-focus
shaft begins to protrude from the pinion assembly and
contact the brass shaft mount. While holding the brass
shaft mount in proper alignment, carefully rotate the
right-hand coarse-focus knob clockwise to engage the
threaded end of the coarse-focus shaft with the threads
in the brass shaft mount. Continue turning the coarse-
focus knob clockwise to begin to snug the brass shaft
mount down, being careful that the gears on the right-
hand side are not damaged as the drive gear in the
coarse-focus knob slips into mesh with the gear of the
steel pinion when the brass shaft mount is snugged
down. Continue tightening the brass shaft mount onto
the coarse-focus shaft until you start to feel resistance.
Figure
85).
Revision 4
Page 27 of 40
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