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#1
03-01-2024, 02:10 PM
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Cub Cadet 3165 Slow leak on transmission
Ok, I have a CC 3165 that has a slow leak on the transmission/differential It drips very slowly from the right side just under the axle. It does NOT look like the axle seal is the problem. I cleaned up and blew all the fluid and gunk out from the area. It looks like the fluid is welling up from below in the housing rather than the differential itself. I am going to go back out and check it again to see if I can see a specific place it is coming from, but I am thinking it is coming from behind the black housing and weep up. The housing may be full? Before I tear too far into it, I was hoping I could get some insight or opinions. There is a part number on the outside of the housing: 618-3134A
Here are a couple photos. This is the housing and axle. Yellow line shows where the fluid is collecting 20240301 Rear Axel (5).jpg Here is a closer look at the area where the fluid is collecting marked by yellow line 20240301 Rear Axel (2).jpg Here is another close up showing where the fluid is collected blue arrow 20240301Rear Axle (1).jpg And this is after about an hour or so, you can see the fluid has come back. 20240301_140804.jpg If I take that back black housing off, will that have a gasket or is it just a housing or shield for the differential/axle? Let me know if you guys have any tips, ideas, insight, cautions, whatever. Transmission runs fine as it is btw. 
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#2
03-01-2024, 04:33 PM
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I cleaned it all up again and took this photo about a half hour later. It shows the fluid collecting again, but no sign of it coming from the axle seal.
20240301_close up.jpg
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#3
03-01-2024, 05:45 PM
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This doesn't look good to (to me)...
Put mouse pointer on image, click right mouse button, select "open image in new tab", open the new tab, hold down "ctrl" on your keyboard and hit "+" key on your number keypad six to 10 times to enlarge image. It looks better in your last picture but you may have pushed it back in while cleaning.
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#4
03-02-2024, 07:30 AM
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The axle tubes are dry on the aluminum rears in the 3k machines.
Here's my 3165 from a few years ago. https://www.onlycubcadets.net/forum/...ad.php?t=33446
__________________
This ain't no hobby....it's an addiction
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#5
03-02-2024, 09:49 AM
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Hey Oak, awesome write up. I have been getting some good info from Kawasaki Old Man over on MTF as well. How did everything hold up on your repair?
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#6
03-02-2024, 09:51 AM
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Quote:
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#7
03-02-2024, 01:13 PM
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Quote:
But regardless, as Oak said up above the axle tubes are dry, meaning they don't normally carry any oil in them. So the seal you are picturing is in the outer bearing block and is meant to be a dirt/dust protector for the needle bearing in the outer bearing block. On the other hand, the seals in the inner bearing block are meant to stop oil from passing into the axle tube. If the inner bearing block seals are leaking oil into the tube, the oil will find it's way to escape where it wasn't designed to contain oil (i.e. around the outer edges of the outer bearing block).
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#8
03-03-2024, 05:08 AM
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Quote:
 Bill is the man on the 3k machines. I looked over at the MTF post and that was some good info and vids.
__________________
This ain't no hobby....it's an addiction
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