7. Take another S12D4 Coupling and fix it on the D3.9L120 Axle.
When installing, pay attention
to that the tooth surface of the
bevel gear should be facing
down, and the bevel gear is
above the motor shaft. At this
time, no need to fix the bevel
gear. The F624ZZ Bearing should
be embedded in the A10. When
fixing the S12D4 Coupling, put
the lower S12D4 Coupling
against the table top. Then,
press the upper S12D4 Coupling
down by hand, and then tighten
the M4*4 Locking Screw on the
S12D4 Coupling.