Front Wheel Bearing/Hub Seals, 2001 U320

Topic: Front Wheel Bearing/Hub Seals, 2001 U320 (Read 1741 times) previous topic - next topic

Front Wheel Bearing/Hub Seals, 2001 U320

August 10, 2014, 08:15:03 am

How's that for a more specific topic headline?

My right front hub seal is leaking a wee bit. I have some black radial streaks on the wheel. No significant change in the hub oil level. I am having the hub oil drained and replaced next week and the seals on both hubs replaced at Cummins.

Does anyone know the part number for the seals? (Not IFS) is this a complicated task to replace the seals? Anything I should make sure they do or watch for?

Maybe it was overfilled? Maybe just need new red caps?

Thanks,

Roger

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #1 – August 10, 2014, 10:08:31 am

Quote from: Home2fromHastings – August 10, 2014, 08:15:03 am

How's that for a more specific topic headline?
My right front hub seal is leaking a wee bit. I have some black radial streaks on the wheel. No significant change in the hub oil level. I am having the hub oil drained and replaced next week and the seals on both hubs replaced at Cummins.

Does anyone know the part number for the seals? (Not IFS)
Roger

Stemco Hub Cap Window Kit

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #2 – August 10, 2014, 10:56:15 am

Roger,
Are these oil streaks ob the outside on the rim or on the inside only seen while looking at inside/ back of wheel?
If on outside, the oil level is over filled and / or bad rubber center plug.
If on the inside, yes the hub seal is leaking.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #3 – August 10, 2014, 11:38:27 am

Thanks Barry, You are a treasure.

Hi Dave, Without taking the wheel off, it looks like there is no streaking on the inside. The insides of both front wheels are equally dirty. So I will have the Cummins folks look closely. I didn't start seeing any of this until last summer and have been watching it closely. The oil level is between the inside and outside ring. Maybe a bit more now than last summer. I hope it is just the cap.

Is this oil level something that would get checked during a chassis lube?

Thanks for the feedback.

I sure hope I get a chance to meet more of the great folks here on the Forum.

Roger

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #4 – August 10, 2014, 09:28:30 pm

If the oil streaks are on the outside of the wheels, I would check the rubber plugs on the window, they are probably hard and not sealing, You can get new ones at NAPA and replace them yourself. They are not very expensive. Just take one along as an example. I had to replace the ones on our front axle and also on the tag axle.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #5 – August 10, 2014, 09:35:01 pm

I had to replace the entire plastic window and plug, as somebody before me used the wrong one AND used RTV and made a mess. It's about a 5 minute job (well, 15 minutes of scraping RTV off) and parts cost at NAPA was about $7.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #6 – August 11, 2014, 10:21:56 am

Snip: "I had to replace the entire plastic window and plug, "

Might you have a NAPA Part Number, or........ ? I have one hub leaking around the plug (I think) and have been casually looking for solutions. If NAPA is a source, I'm static for a few days and will check. Thanks!

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #7 – August 11, 2014, 03:18:32 pm

3 places on the outside to leak.. already mentioned are plug.. and plastic cover.. next is the puter hub cover with gasket.. still an easy fix.. 5 bolts hold it on I think it is.. any of the 3 is a minute fix.. the ones we like to see leak if anything must leak. someone may have already mentioned.. I have been reading fast as we have a KW out in the show getting new king pin set and another getting a d2 air governor... don't know why I think I have to be out there looking over my mans shoulder.. he could raise up real fast and bloody my nose.. my shop and I reserve the right I suppose.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #8 – August 11, 2014, 03:20:54 pm

MOT parts sent my lil red plugs, I lowered the oil level to lower ring, BINGO, no more leaks or streaks, why make it difficult !

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #9 – August 11, 2014, 04:56:51 pm

Dave, sometimes your too smart

Had the same issue on the way to AZ, stopped by a international dealer the mechanic says as long as you have oil in the sight the seal will last.

But, I like your simple approach to issues!

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #10 – August 11, 2014, 06:30:01 pm

Quote from: Home2fromHastings – August 10, 2014, 08:15:03 am

How's that for a more specific topic headline?

My right front hub seal is leaking a wee bit. I have some black radial streaks on the wheel. No significant change in the hub oil level. I am having the hub oil drained and replaced next week and the seals on both hubs replaced at Cummins.

Does anyone know the part number for the seals? (Not IFS) is this a complicated task to replace the seals? Anything I should make sure they do or watch for?

Maybe it was overfilled? Maybe just need new red caps?

Thanks,

Roger

My guru buddy had to train the local cummins shop to not overfill the hubs. The outer circle is the correct line not the inner.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #11 – August 12, 2014, 12:53:52 am

Quote from: Chad and Judy – August 11, 2014, 10:21:56 am

Snip: "I had to replace the entire plastic window and plug, "

Might you have a NAPA Part Number, or........ ? I have one hub leaking around the plug (I think) and have been casually looking for solutions. If NAPA is a source, I'm static for a few days and will check. Thanks!

I'm away from home and do not have the PN with me, but the PDF Barry put up has them. The NAPA I was at just looked up the stemco number

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #12 – August 12, 2014, 10:42:06 am

Thanks; I was responding via the e-mail, and I should have looked at the forum posting before asking! (Thanks Barry!)

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #13 – July 14, 2015, 09:14:50 am

Thank you all for your information...we just arrived in Maine via Michigan and I found my hub leaking. Sure enough after researching here I found my red plug with some dry rot and the seal still holding oil. Off to NAPA for a plug and oil to top off. If that doesn't work I'll stop for a repair otw back to Michigan.

Now to get the oil off the side of the coach eeerrrrrrr

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #14 – August 11, 2017, 04:50:42 pm

If anyone know, I am struggling to pinpoint a part number for red Hub Cap Plug. It is for Stemco 4024.
Is it Stemco 359-5990 Rubber Plug

Here is two pictures of my 2003-GV-295 Hub Cap Stemco 4024 with a side plug (bolt)

Thank you,
AL

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Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #15 – August 11, 2017, 05:02:02 pm

Al,

Take it by any parts place that caters to OTR trucks. A very common part. While plug is removed, use tape or something to cover the opening to keep it from being contaminated.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #16 – August 11, 2017, 05:15:39 pm

The outer ring on the cover is the correct oil level. Not the inner one

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #17 – August 11, 2017, 05:49:29 pm

Al,

If you are still in the DFW area run by MHC Kenworth. They have a bushel basket full of them under the parts counter.

Pamela & Mike

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #18 – August 11, 2017, 10:08:39 pm

Bob,
I disagree. Outer ring is min oil level. Inner ring is full.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #19 – August 11, 2017, 10:22:33 pm

Reading all these oil level discussions, I have never been positive whether you are to read the inner and outer rings on the lower half (below the axle) or on the upper half (above the axle). The answer to that question would seem to answer which ring represents minimum and which maximum.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #20 – August 11, 2017, 10:25:19 pm

You read oil level at the six o'clock position.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #21 – August 11, 2017, 10:29:18 pm

Thanks Brett. That is what I had assumed, but assumptions are not always a good idea.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #22 – August 11, 2017, 10:31:13 pm

Quote from: amos.harrison – August 11, 2017, 10:08:39 pm

Bob,
I disagree. Outer ring is min oil level. Inner ring is full.

Agree with Brett, just checked mine, inner ring says full. If you take the red plug out and oil comes out you are overfilled, if you can only see a little bit at the bottom, add till just below the plug hole.

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #23 – August 12, 2017, 01:18:17 am

My guru buddy mentioned strongly that the inner ring can overflow and he had to train the cummins dealer here to not overfill his customers coaches.

Not sure if one is cold or hot or any other reason why he would mention this so strongly but I am brave and posted what he said.

Versus say nothing? Maybe more research will help?

Better off if I stayed out but there should be info around?

He was the Newell local warranty service guy for many years and does primarily big stuff.

Maybe they heat and expand the hub oil more from the heavier loads?

Re: Front Wheel Bearing/Hub Seals, 2001 U320

Reply #24 – August 12, 2017, 06:13:08 am

For a few dollars more I would get the whole cover and the red cap,if the plastic cap is old/worn so is the cover.There is a gasket
between the cover and the aluminum base.The oil also needs to be changed once in a while,the expanding of the oil as it gets
hot and cold will over time draw in air thru the vent hole and over time draws in dust.I know that Foretravel uses silicone to seal
the base to the hub but Stemco in their video strongly advises not to use silicone but a gasket instead.They claim the silicone
will get between the oil and the bearings causing wear.I myself would rather change oil and a gasket instead of a bearing.

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