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Old 07-18-2020, 05:40 PM   #1
MD3
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Seneca rear diff leak

Anyone dealt with a rear diff leak on a Seneca ?
2018 with 12k miles.
My Jayco Warranty is up so not sure if any Freightliner warrant still exsists.
Also the extended warranty has been about worthless so not expecting any help on this from them.

Looks like itís coming from the seal. Not sure if the axle shafts have to be pulled or what else... thinking this might not be a dyi job.
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Old 07-18-2020, 07:10 PM   #2
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The S2RV chassis has a 3 yr/50,000 warranty if I remember correctly.
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Old 07-18-2020, 07:25 PM   #3
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The S2RV chassis has a 3 yr/50,000 warranty if I remember correctly.
Not all 2018's are on S2RV chassis... The early 2018's on the M2 chassis has the Detroit rear axle that has a 24 month warranty.

Yes, we have had the leaking diff back when it was on Warranty. Our FL dealer fixed it when we had our annual scheduled maintenance and it never leaked since.
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Old 07-18-2020, 07:51 PM   #4
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You might also check to see if the diff is over filled, sometimes this can cause them to leak and there is a chance if brought down to the correct level, it might not leak....this would happen of some Rockwell Axles I had. I would be worth checking.
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Old 07-18-2020, 08:11 PM   #5
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You might also check to see if the diff is over filled, sometimes this can cause them to leak and there is a chance if brought down to the correct level, it might not leak....this would happen of some Rockwell Axles I had. I would be worth checking.

Good call out...
yes... a possibility if the vent tube is not connected / routed over the top of the carrier. Most Rockwell's built in rock buggy's we worked on put the opening of the vent tube way above the "water line" for river crossings. I looked at ours, and it goes over the carrier at the top of the diff - and the opening is at least 4" above the fill level. Where else can a rockwell carrier leak from at the diff besides the vent if the axle is almost always flat(Seneca off camber??? - I want to watch)?
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Old 07-18-2020, 08:25 PM   #6
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A prior thread about M2 axle leaks, mine was one!

https://www.jaycoowners.com/forums/f...xle-72547.html
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Old 07-19-2020, 05:14 AM   #7
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Our 2016 37FS had a leak that was caught by a technician at the local garage. Under his direction, I took it to a Freightliner dealer and it was taken care of. This was at about 18,000 miles. They did have to keep the unit overnight to let the gasket sealer setup. The Freightliner Technician felt that it was an original assembly failure and there was no charge. Take it in and get it fixed by a Certified Technician. Get it fixed correctly and you'll sleep better.
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Old 07-19-2020, 11:15 AM   #8
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We have seen a few of those issues on that style of rear end. The gasket which in some cases is silicone leaks at or around the 6:00 position. Providing of course the drain plug and pinion seal have been ruled out. The fix is to pull both axles, unbolt the differential and pull it clear of the actual housing. Clean both mating surfaces, apply silicone, let it set up then re-install the differential. We do use a special rolling jig to handle the extremely heavy diff. I have also seen the bottom of the actual rear end housing deformed by someone trying to the lift the back of the coach with an air jack.
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Old 07-19-2020, 07:12 PM   #9
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Is the rear diff supposed to be shaped like this and indented around the drain ?
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Old 07-19-2020, 07:18 PM   #10
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Here is another pic, is this normal for the drain to be indented ?
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Old 07-19-2020, 07:49 PM   #11
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Here is another pic, is this normal for the drain to be indented ?
Just went out and crawled under ours... here is ours
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Old 07-19-2020, 09:03 PM   #12
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That does look suspect. That happens when someone places a jack beneath and dead center of the rear end housing in order to raise the coach off the ground, most likely for tire work. Has it been worked on recently? That dimpling of the housing can distort the sealing surface where the third member mates to the rear end housing. If you look close you should be able to see the distortion, right where the leak is.
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Old 07-28-2020, 06:50 PM   #13
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I was under mine today and took a pic, yours definitely looks like it has been hit or jacked on.
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Old 07-28-2020, 07:52 PM   #14
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I was under mine today and took a pic, yours definitely looks like it has been hit or jacked on.
Yep... totally agree.

If it has leaked.. it usually shows the tell-tale sign that someone has put a 20-ton jack under the pumpkin THAT SHOULD NOT HAVE! Cant say all that do have been lifted on the diff - but that carrier housing is not made for the load.
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