2-25
Lower unit
Gear oil changing method
There are 2 methods that can be used for changing the gear oil of this model. One method, which is
similar to the method for previous models, uses the oil level plug, gear oil drain bolt, and oil filler bolt
of the lower case, and one method uses a pump and the hoses on the side of the engine.
Changing the gear oil using the lower case
Although previous models used 1 bolt hole (M8) to drain and fill the lower unit with gear oil, this model
is equipped with 2 holes: 1 hole (M18) “a” for draining the gear oil and 1 hole (M8) “b” for filling the
lower unit with gear oil. Because the hole for draining the gear oil is larger, the time required to drain
the gear oil is reduced and serviceability is improved.
Because the drain plug “1” is larger, the size of the magnet is also larger. A new type of magnet is
used. Because the direction of the magnetic force of the magnet is different from that of previous mod-
els, a large amount of metal particles “c” become attached to the sides of this new type of magnet.
As a result, this magnet is able to collect metal particles using a larger area than the type of magnet
used for previous models.
The lower unit is filled with gear oil through the oil filler hole. Because the hole has the same diameter
as the hole for previous models, the same gear oil pump can be connected to the hole. Because the
oil surface level is lower than that for previous models, the oil level plug “2” was moved to a lower lo-
cation compared to previous models.
For the changing procedure, see “Changing the gear oil by removing the drain screw” (10-17).
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