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Old 09-22-2020, 10:56 PM   #1
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Do I have an axle hub leak?

After getting home from our latest trip & the coach had been sitting at least an hour, I happened to notice a small puddle (a couple tablespoonfuls) of a deep golden brown oil puddled in the bottom of the outside PS rear wheel rim. An oil film also went all around the rim. I didn't crawl underneath as it was almost dark so I couldn't see anything anyway. I cleaned up the leak, but am wondering where it came from. ?? Nothing felt hot, but then it was sitting over an hour, & I smelled the oil & it didn't smell burnt or anything.

Seems any thread I searched on iRV2 were discussing this issue on Workhorse chassis. Different animal, but what I found matches what those posts were referencing.

Also, my nearest PG chassis service center is over 2hrs away. Can I safely drive the coach there for service? I supposed I could always call them & ask.

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Old 09-22-2020, 11:07 PM   #2
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Most likely an axle gasket. I had them go bad at about 12yrs. If it just started and isn't worse by morning you should be fine.
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Old 09-23-2020, 07:33 AM   #3
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Pull off your wheel cover and check to see if the axle bolts are all tight. If so or you absolutely need to take it to a service location, you can easily drive it. Plenty of oil in the rear and that's what you are seeing coming out the axle to the end of the axle where it fastens to the wheel. BTW, cost for that seal will be less than 5 bucks and changing it out will take less than 15 minutes if you do it... Just be aware.
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Old 09-23-2020, 08:04 AM   #4
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Since it's on the outside wheel, chances are Pigman and Woltz are correct. If it was on the inside of the inner wheel it might be the axle seal itself. The "high hat" cover on the wheel comes off by screwing the center emblem out using the wrench that should have been provided with the coach. Be aware that one side of the axle is right hand thread and the other is left hand (I can never remember which is which). There is an end plate underneath with a series of bolts around it. It could be as simple as re-tightening the bolts or the gasket underneath may have to be replaced. It shouldn't require a PG service center as this is a common truck item. If you have a Rush truck center near you they could do it and they are now an authorized PG service center. Depending on the date your coach went in service it may still be covered under the three year chassis warranty.

And no, it won't hurt to drive it as long as the oil level in the differential is okay. I lost an inner seal on our Itasca at the start of a 3,000 mile trip and continued on just checking the differential oil and adding a little occasionally.
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Old 09-23-2020, 10:16 AM   #5
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I was going to do some wheel polishing this morning and I took a couple of photos so you will see what the axle end plate looks like. I did confirm that the PS wheel hub cover is a right hand (normal) thread and the DS is left hand. The below photos show the hub removal tool that you should have gotten with the coach and the axle end plate. When you remove the hub cover and there is oil inside it then it's definitely the axle end plate that's leaking and not the wheel seal. The nuts on the end plate may just need to be tightened. There is a thin paper gasket behind the end plate that may have to be replaced if tightening doesn't have an effect.
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Old 09-23-2020, 03:02 PM   #6
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Thanks, guys. Dave may take a look at it to see if he wants to tackle it. There was a Rush Truck Center less than 30min from where our coach is now (at the dealer for some fiberglass repair....that's another story). But after I called them - based on the fact they ARE listed on Tiffin's website as an authorized Tiffin PG chassis center - that location told me they don't work on motorhome chassis. The PG center that I've taken our coach to before I'm very happy with & trust them.

Oh & since we got our coach used, there was no wrench as pictured anywhere in the stuff we got nor did I find one stashed anywhere I could find. If Dave wants to tackle this, what can I use to get that logo'd cover off? A channel lock/slip joint pliers? I don't want to scratch it.

Our coach went in service Feb 2018. when it was purchased by the original owner.

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Old 09-23-2020, 03:16 PM   #7
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Large channel lock pliers will work. The logo cap has some dimpled stops on the back side to prevent them from backing out so he may encounter a little resistance. He'll feel them as the cap turns.
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Old 09-23-2020, 04:23 PM   #8
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Keep us posted on your progress.
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Old 09-23-2020, 05:54 PM   #9
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Do I have an axle hub leak?

I might be careful driving if leaking out the end of the axle. I would fill the differential and then drive the opposite side up on ramps about four or five inches to ensure the bearings have enough oil in them to be driven. Bring back to level and recheck the differential.


I didnít get the wrench with my used coach either, I made one.
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Old 09-23-2020, 07:22 PM   #10
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axel gasket PS Outer Wheel

The paper gasket had a tear and leaked.Called a local truck repair...they pulled the axel , replaced the gasket and I was back on the road in about an hour
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Old 09-23-2020, 08:09 PM   #11
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Good news! Thanks for the update.
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Old 09-23-2020, 09:26 PM   #12
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Good news for Rod, but I'm the OP.

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Old 10-02-2020, 09:03 PM   #13
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UPDATE

I had a truck repair shop take a look at it & they replaced the gasket, cleaned up the wheel well & topped off the differential fluid (tech said a bit over half a cup was gone).

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Old 10-03-2020, 01:16 PM   #14
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That's good news that it was just the gasket and not a wheel seal!
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