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*About necessity of the backlash measurement management
The recent outboard motor tends it to be upsized.
The gear in the lower unit transmits the big output to a propeller only by the primary gear
reduction of bevel gear.
The load to depend on each gear becomes a considerably much bigger.
In addition, the gear case is used in the water. Therefore it is necessary that the volume of
lower case should be smaller as possible, to reduce the water resistance.
Therefore the capacity of the gear oil becomes that it was limited.
Use environment is severe, and as for the lower unit that lubricating oil capacity is limited which
is totally heavy condition to the lower unit.
It suffers from backlash management to maintain to use gear tooth contact in best condition for
long term.
Gear life shortens when negligence of the backlash management.
Please identify a method of the maintenance as necessity of the backlash management.
[The backlash]
There are three kinds of gears (A, B and C) in the case.
These have the processing dimensions gaps of a gear case and need an adjustment using
shims for three gears. This adjustment is needed to have a best gear tooth.
These are to become the backlash (same as for the tooth contact) same as a design standard.
It is done backlash adjustment in a factory, and it is shipped to the world. The way of thinking is
as follows.
【Measurement of Backlash】
B gear shim
A gear shim C gear shim
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