Refilling Gear Lube on JW-10

[Yellowstone]

So I messed while putting a new impeller on and loosened the drive shaft from the pinion it sits in. I couldn’t get it to slide back into place with the gear lube in, so I drained that and then tried and was successful after lots of playing Yahtzee with the lower unit. Now, my question is, do I refill the lube from the top opening that says Refill with Hypoid Oil? Or do I use the lower opening that says Drain. It seems like a no brainer given the opening descriptions and while I can’t find specific text in the 1964 Johnson Manual, it does show the lube being put into the top opening in a photograph. The only reason I ask is other motors I read lots of other articles saying you should put the lube in from the bottom to avoid air bubbles. Thanks!

[frankr]

Proper way is put it in from the bottom. However, the 3hp is kind of unique in that you can drizzle it in slowly from the top. Your choice.

[Yellowstone]

Thanks. I figured it looked kind of unique to the rest of the models in the service manual. This has been a learning process but a fun and rewarding one. I’m learning all the parts of the motor for sure.

[lindy46]

I fill from the bottom until it overflows from the top.

[Yellowstone]

Thanks. I plan to use the lower opening to fill today so I can finish checking the points and getting ready to put the flywheel back on. Once the new torque wrench arrives.

[Author]

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