Portal Hub leaking 404 axle

[coachgeo]

Some may have followed this in a few other threads. I have brought it here for others to find easy and to update the info.

Synopsis of the situation.

404AxzlHub
404axzl

[coachgeo]

I went four wheeling for two days.. on the way home.... I found the above.

From the questions I asked of the few Mog guru's, they said... "reduction gear hub (portal) leak".

Also was said .... "not uncommon... they eventually leak cause the axles have sat and the seals are not properly swollen". Some suggested that this could occure even after many weeks of driving a Mog that had sat. I had driven it as a daily driver for six weeks prior to the leak occuring.

404AxzlHub
404axzl

[Puffdragon]

Mine leaked like that once:D But it hasent done it since. Clean it and drive it, it might seal back up. Stranger things have happend on a Mog. But that is the lower outer seal, not sure but i would think that was an easy repair (relative to a MOG)

404AxzlHub
404axzl

[The Rockslut]

Possibly a plugged vent? Thus causing pressure in the hub unit and blowing the seal when the pressure rises.

(Moderator note: damit did it agian.... I hit edit instead of quote)

404AxzlHub
404axzl

[AGGIE_04]

Am I right in saying that if the tranny output seal leaks, it will seep through the torque tubes and fill the hubs up and make them leak? Mine leak, but only on the inside of the wheel.

404AxzlHub
404axzl

[coachgeo]

Originally posted by AGGIE_04
Am I right in saying that if the tranny output seal leaks, it will seep through the torque tubes and fill the hubs up and make them leak? Mine leak, but only on the inside of the wheel.

My understanding about that phenomenon is that it does not actually go into the portal.... but it does find other places to leak out. Granted this an amateurish understanding of things.

If I’m understanding this correct; your inside leak that you see is coming from the axle end at the portal not the portal hub seals. The portal’ s lubing; if I’m not mistaken, is a separated entity from the axle shafts and center pumpkins lube system, thus the oil leak from the tranny could not get to the portals. Again this is based on an amateurish understanding though.

Im known to be wrong so if anyone can clear this up it would be great.

404AxzlHub

[coachgeo]

Originally posted by The Rockslut
Possibly a plugged vent? Thus causing pressure in the hub unit and blowing the seal when the pressure rises.



ok....... now Im in the right place.......... :flipoff2:

well that is where I have an unanswered question. Does the vent on the pumpkin also serve as the vent for the portal. The portal is pretty much a completely sepperate gear box and I dont know where it vents at.

[Scout Dude]

Originally posted by coachgeo


ok....... now Im in the right place.......... :flipoff2:

well that is where I have an unanswered question. Does the vent on the pumpkin also serve as the vent for the portal. The portal is pretty much a completely sepperate gear box and I dont know where it vents at.

The vents are just inside the 4 bolt area of the out hub/axle part

Edit: I was wrong(Just went and looked), it's the other flange part that has a crap load of bolts

[coachgeo]

Originally posted by Puffdragon
Mine leaked like that once:D But it hasent done it since. Clean it and drive it, it might seal back up. Stranger things have happend on a Mog......

WEllll. you may have hit the head on the nail.

I drained the oil from the suspecting hub. IT WAS NOT LOW.... it was actuall over filled just a little. Could it be water.....? Could it be from a tranny leak..... From what I now understand this probaly is not from tranny leak. Maybe water??

Did the draining. I saw nothing that made me suspect water. The overfill amount appeared to be simply that the last person who did maintainance on the hub filled it from and up to the level of the fill hole and maybe then some before putting in the fill plug bolt. (see pics and text of hub lubing below. )

To do the draining *I used a liter bottle of soda.. with the
bottom cut off (only about 1.5" of bottom) had a top that fit real
nicely into a wide mouthed platic bottle about a Qt. in size. What I used that had a wide top happend to be a bottle of Diesel fuel additive. Anyway I put one atop the other and was able to stuff the liter funnel under the drain whole pretty well to keep the oil from going everywhere as I drained the hub. Some spilled but not much. When the oil level was at a drip I moved the bottle lower to let it drip in. I just did not catch this soon enough. If I had maybe would have had no spillage. I did drain this cold
but it had been sitting for 18 hours so most all oil should have been at the bottom of the hub.

For filling..... I used a Napa bought hand fluid pump made for
gear oil bottles, engine oil bottles etc. It supposedly provides One Ounce volume of oil per pump. I prefilled the whole pump system first. Then it took around 23 pumps to fill the Hub to the INSPECTION WHOLE (# 1 in the pic). It's wierd that the inspection hole is higher than the fill hole.

What else..... so far the brake resevoir still looks to be at normal
level so that does not appear to be the leak.

hmmmmmmmm maybe I ran over something BIG AND SLIMY on the way home??? Orrrrr maybe it is one of the magic leak and seal phenom that Puffdragon spoke of above.

Any other thoughts?

oh... and I'll do the other hubs and diffs tommorow. Its raining again.

http://www.pirate4x4.com/forum/uploads/hub lub text.jpg

http://www.pirate4x4.com/forum/uploads/hub lub pic.jpg

*ps- I made this funnel at the end of my camping trip to add a little oil to the tranny. By pure accident I cut the bottle to near"perfect" fit to the inspection hole in the cab to access the tranny dip stick. The one liter bottle's neck fit perfect into the tranny fill/dip tube. Was realll easy to add oil to the tranny this way.

404AxzlHub
404axzl
404Tranmizion

[coachgeo]

Originally posted by Joel K®


The vents are just inside the 4 bolt area of the out hub/axle part

Edit: I was wrong(Just went and looked), it's the other flange part that has a crap load of bolts

So are u saying u did not find the vent or that u think you did but miss identified its location?

404AxzlHub
404axzl

[The Rockslut]

The vent for the portal hubs is the little copper tube that is curved up and over the CV joint. It is connected to the housing via a banjo bolt. Take this tube off and make sure its clear.

404AxzlHub
404axzl

[coachgeo]

Originally posted by The Rockslut
The vent for the portal hubs is the little copper tube that is curved up and over the CV joint. It is connected to the housing via a banjo bolt. Take this tube off and make sure its clear.



Thanx.... thought it might be that.. but then again I thought it might be the brake line.... guess I should have looked closer and not assumed.

404AxzlHub
404axzl