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05-21-2019, 11:17 AM
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#1
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Senior Member
Join Date: Oct 2017
Location: North Carolina
Posts: 154
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Unexpected Incident with Tag Axle Oil Cap
Got to the campground after 8 hours or so on the road and saw that the curbside tag axle was leaking oil. Took off the chrome cover to discover that the center plastic center of the oil hub was completely gone and the red plug was lying in the well. Not sure where any of the broken plastic went as I only found a few small bits.This is the same hub that I replaced about a year ago.
Ordered a new one and is an easy fix. I just can't think of what would have caused the entire center to catastrophically implode.
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2009 Monaco Camelot 42 PDQ Cummins ISL425
2022 Ford Bronco WildTrack
2019 BMW K1600B Grand America Motorcycle on a Cruiser Lift.
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05-21-2019, 11:29 AM
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#2
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: Tucson, AZ
Posts: 6,579
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Maybe it's time to pull it apart and check the bearings?
Where did the plastic pieces go?
I had a rear drive axle seal go and leak oil last year, but so far I haven't had an issue with the tag.
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97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
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05-21-2019, 12:51 PM
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#3
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Senior Member
Join Date: Feb 2012
Posts: 539
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Need to check the bearings and brakes could have gotten hot and melted.
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Bob & Elaine McClelland and the spoiled pup Izzie
2008 Monaco Diplomat
Desert Hills & Parker Az
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05-22-2019, 02:10 AM
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#4
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Registered User
Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,993
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With the plastic cap gone you should have oil everywhere????
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05-22-2019, 03:13 AM
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#5
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Senior Member
Newmar Owners Club Workhorse Chassis Owner Spartan Chassis
Join Date: May 2010
Location: McAlester Ok
Posts: 2,057
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I’ve had one “disappear” and has a lot of oil on the wheel ( didn’t go completely dry). Had one leak.
I’ve been told that when they get old, they will leak. Pay attention to the color. New ones are red, as they get old and subject to leak they wii become pink.
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2007 Newmar KSDP. 3912
2010 Nissan Frontier SE
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05-22-2019, 05:41 AM
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#6
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Senior Member
Join Date: Mar 2012
Posts: 197
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when they get old the plastic will craze or look cracked and need to be replaced. Been there and done that
jim e
06 exec
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05-22-2019, 06:06 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 5,819
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Is there any oil in there now (on the bearings)?
At least with a Tag axle you can lift it and then spin the wheel and check for bearing noise/play.
If the bearing stayed wet and there is no noise or bearing end-play, then I would put on a new hub and fill with oil and drive it home. Then schedule to have a shop look it at your convenience.
If there is noise or you can rock the wheel, then your going need to drive with the Tag up (so the wheel doesn't rotate) to get it to a shop. If your setup is like mine you can chain the Tag up. (Adjust tag air pressure regulator to zero, and wrap a chain around the Tag to hold it up).
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05-22-2019, 06:24 AM
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#8
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Senior Member
Join Date: Jul 2017
Location: Benton, AR
Posts: 1,062
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One wheel has a Stemco cap and the other is a no-name brand. I don't know which one is/was the newer but someone has done work on that tag before. Internal pressure is created with friction/heat and if it can't be vented properly through the pinhole in the center of the red cap then pop! Either the center cap blows out or the entire plastic window pops. A common problem is water in the oil which creates steam when hot. Just hot oil doesn't do this, as it just expands, but there's plenty room for expansion when the hub is properly filled.
Looking at picture 1 I can see bright metal inside the hub cap as it should be, however, picture 2 shows brown metal. That suggests water intrusion to me and that would be the culprit in the explosion.
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2009 Country Coach Veranda 400, ISM 500, Aqua Hot 525D
2019 Lincoln Nautilus 2.7L Toad
2020 Lectric XP E-bike (Hybrid)
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05-22-2019, 06:32 AM
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#9
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Senior Member
Join Date: Jul 2017
Location: Benton, AR
Posts: 1,062
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Here's a bit of advice from Rayco Granning concerning hub cap care and maintenance. Many folks think the red cap is also a fill port. This is true if your hub cap doesn't have a fill port on its side. If it does, then don't remove the center cap to add oil.
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2009 Country Coach Veranda 400, ISM 500, Aqua Hot 525D
2019 Lincoln Nautilus 2.7L Toad
2020 Lectric XP E-bike (Hybrid)
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05-22-2019, 06:38 AM
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#10
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Community Moderator
Monaco Owners Club
Join Date: Jul 2016
Location: Central, Arkansas
Posts: 11,286
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I have been adding oil to hubs for 30 years and have never done it any other way than to remove the red cap. Only maybe twice was the plastic broken out and that was because of an impact. If it doesn't pull out by hand though its time for a new one they do get hard over time.
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2004 Beaver Monterey Laguna IV
Cummins ISC 350HP Allison 3000 6 speed
2020 Chevy Equinox Premier 2.0t 9 speed AWD
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05-22-2019, 07:27 AM
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#11
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 5,819
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Quote:
Originally Posted by spdracr39
I have been adding oil to hubs for 30 years and have never done it any other way than to remove the red cap. Only maybe twice was the plastic broken out and that was because of an impact. If it doesn't pull out by hand though its time for a new one they do get hard over time.
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Same here - but never too old to learn something new.
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05-23-2019, 02:28 PM
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#12
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Senior Member
Join Date: Oct 2017
Location: North Carolina
Posts: 154
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Quote:
Originally Posted by CountryB
Is there any oil in there now (on the bearings)?
At least with a Tag axle you can lift it and then spin the wheel and check for bearing noise/play.
If the bearing stayed wet and there is no noise or bearing end-play, then I would put on a new hub and fill with oil and drive it home. Then schedule to have a shop look it at your convenience.
If there is noise or you can rock the wheel, then your going need to drive with the Tag up (so the wheel doesn't rotate) to get it to a shop. If your setup is like mine you can chain the Tag up. (Adjust tag air pressure regulator to zero, and wrap a chain around the Tag to hold it up).
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CountryB, Got the new hub and checked the end play and any grinding noise when I spun the tire around. All felt and looked good. Will see how it goes on the way home next week.
Rustygold
__________________
2009 Monaco Camelot 42 PDQ Cummins ISL425
2022 Ford Bronco WildTrack
2019 BMW K1600B Grand America Motorcycle on a Cruiser Lift.
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05-24-2019, 02:06 PM
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#13
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Senior Member
Monaco Owners Club
Join Date: Jul 2017
Posts: 237
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Word of advice from old truck driver. Leave the chrome cover off so you can feel the hub after driving a ways. Hub should be slightly warm never hot. If hot bearings are too tight or worn out. Never drove with chrome covers on either steering or drive axles when driving so could feel the hubs every couple hours when checking tires. Still check tires every 2 to 3 hrs and shoot wheel with infrared thermometer for bearing and brake heat. Yes I have TPMS system but old habits die hard. Good luck, Don
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05-25-2019, 06:58 AM
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#14
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Registered User
Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,993
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Like Don, I still IR temp tires, brakes, and bearings. I’m looking for a temp that is higher than normal on the same spot...side of the tire 1” from the tread and the base of the chrome cover on the tag. Excessive heat there could be brakes or bearings although I try and use the Jake when I’m going to stop and temp everything.
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