Figure 55 – Remove the metal wave tension washer
Disassemble the Pinion Assembly
The pinion assembly consists of a brass pinion mount
(the outer sleeve), a steel pinion (the hollow inner shaft
with a gear on it), a slotted brass retaining ring
(opposite the gear end), and 60 steel bearing balls (30
of which support each end of the steel pinion). The
pinion assembly is disassembled by unscrewing the
retaining ring (which is staked in place with adhesive)
from the steel pinion, after first softening the adhesive
by thoroughly heating it with a heat gun (see
Figure 56 – Heat the slotted brass retaining ring
Note that once the retaining ring has been loosened,
the steel balls supporting the pinion ends will be free to
come out, and these will fall all over hell and gone
given half an opportunity. To prevent this, only remove
the retaining ring while holding the pinion assembly
over a catch tray of some sort to collect any steel balls
that are inadvertently dropped. A magnetic parts tray,
as shown later in this article, is ideal for this purpose,
since the magnet in the tray will attract the steel balls to
prevent them from bouncing or rolling out.
thoroughly heating the retaining-ring end of the pinion
assembly, use pliers with non-marring jaws to grip the
gear-end of the steel pinion (see
hold the pinion assembly over the catch tray.
2
The key word here is "gone".
Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism
Figure
56).
2
if
After
Figure
57) and then
Figure 57 – Grip the gear end with non-marring pliers
Use a suitable pair of pliers to loosen and remove the
slotted brass retaining ring (see
not to scuff the brass pinion mount in the process.
Figure 58 – Remove the slotted brass retaining ring
As the slotted brass retaining ring starts to loosen, do
not allow the gear-end of the steel pinion to slip out of
the brass pinion mount, otherwise the steel balls
supporting the gear-end may fall out through the
resulting opening and become forever lost. While being
careful to keep the gear-end of the steel pinion fully
seated within the brass pinion mount, remove the
slotted brass retaining ring from the opposite end.
Beneath the slotted brass retaining ring will be 30 steel
bearing balls.
Figure 59
typically be found on these bearing balls.
Figure 59 – Bearing balls in the retaining-ring end
Figure
58), being careful
shows the dried grease that will
Revision 4
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