Just dropped the oil from my diffs and final gear as they were due for their first oil change. Is it necessary to replace the drain bolt gaskets if they show no signs of damage? Also does the rear diff and final gear both fill from the same spot?
What year is your Kodiak? No you do not need to replace the copper sealing washers. And it’s been awhile since I replaced mine but it fills from the top and there is a side plug that you remove which is the full level. Fill until the oil come out of the side plug hole. It’s all in your owners manual.
The final gear and rear diff fill from the same port. However there is a plug that you take out on the side of the diff that is the full plug. You fill until fluid is running out of this plug and then you are done.
The drain towards the front of the diff will drain both sides of the diff. There are times that you won't have to change out all the oil so that is what the one nearest to the rear is for. If you ask me it is a dumb design for what little bit more oil you have to use but some engineer bean counter probably figured that Yamaha could save a few cents and charge you the same. Who knows for sure.
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