Re: how to change gearbox oil
Put it in a vertical, remove the vent or fill at the top, remove the bottom screw and let it drain. it will take some time to drain.
After it has been drained refill with gear lube from the bottom plug until the lube comes out the upper hole. Some models say to fill from the top but I only do it that way when there is a second plug in the top. Make sure to put NEW washers on the screw plugs,if you dont your asking for trouble and you will be back in here asking how to fix your lower unit gears.
