Leaking final drive on HD16DC

Thank you HD.
I have been using 80/90 weight gear oil and put in 5 Gallons after I drained out housing per my original manual. This took the fluid level up to almost the top of the fill plug. Level was down around an inch or two from the top of the fill opening.

It leaked down to under the hole in the case. I added roughly 1/2” gallon out of a new jug of 80w145 gear oil and this took level up to over the opening in the bottom of the final drive housing and will monitor it for a few days. I have heard that Lucas oil treatment and or STP has been used successfully for minor seal leaks.

Will try this course of action and let y’all know . I really appreciate the responses and suggestions. Cal, Ian and HD, thank you.

It’s funny Ian that sitting the final drive in question starts and stops on its own. I’m thinking the cold might play a factor. It’s been very cold here in single digits. When it gets above 30 I will look to see if the oil leak starts again due to viscosity. The more I dig into different aspects of my 16, I see past abuse that I had not noticed before. Mostly dents and metal parts with breaks and obvious rough use. Sprocket covers bent and a couple with cracks, fenders with dents and waves, 3 broken grousers. Seems like it was in the bolders or tree stumps in its past.

Ian Beale wrote: You might have one of those final drive leaks that stops when you work out just where the sprocket has to stop when you park it

I was wondering about that Ian. Wondered if there was a weak spot and not an entire seal failure.

Good one Ian.