Trailer Hub Caps

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by cgilliland, Aug 12, 2020.

  1. cgilliland

    cgilliland Light Load Member

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    I have this older step deck I am cleaning up. I am wondering if you all have installed this type of hub cap adapter. it requires all the bolts out of the hub cover. Am I going to get a lap full of oil? Seems like a fairly inconvenient way to install?

    Also what do you all think about the unused IMG_4370.jpg IMG_4371.jpg IMG_4372.jpg auto inflate adaptar that is there, can i just remove it?
     
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  3. AModelCat

    AModelCat Road Train Member

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    If you can fit the standard rubber plug in the sight glass I don't see why you couldn't toss the adapter out. Not unless there's something that needs to be changed out under the cover?

    Unfortunately you're going to have to pull out all the bolts. You might get lucky and it'll stay stuck to the hub. Even then it may not stay sealed up well for long after you put the bolts back in. A nice little drip tray under there should catch it. Probably not much more than a quart in there anyways. Could always use this as an opportunity to change your hub oil?
     
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  4. cgilliland

    cgilliland Light Load Member

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    thank you sir. good point about just changing the oil at the same time
     
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  5. Claytonbigsby

    Claytonbigsby Bobtail Member

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    Is it an illusion or will that adapter ring (and hub cap) have to be pulled off the hub every time you change a tire?
     
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  6. Goodysnap

    Goodysnap Road Train Member

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    The adapter is for auto tire inflation hoses. With the system inoperable I would just replace the hubcaps with new ones when you put your beauty covers on. You need to make sure the system is disconnected and capped off, otherwise you can cause big problems with air pressure in the hub/seal area. Yes it will make a mess if oil bath bearings when you remove the cap.
     
  7. AModelCat

    AModelCat Road Train Member

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    No the wheel should fit over it. Just makes it a PITA though.
     
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  8. SmallPackage

    SmallPackage Road Train Member

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    Jacking it up as high as you can one side at a time may help with pushing most of the oil away from the outer end. Just about every cap i’ve ever taken off has stayed stuck to the end without the bolts and needed a tap with a soft hammer to break it loose but i haven’t done as many as the other guys who responded either.
     
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  9. cgilliland

    cgilliland Light Load Member

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    only 1 out of 4 leaked a little but even it wasnt much
    older trailer so i guess they are stuck on pretty good
     
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