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555e Hub Seal

Mike-G

Mike-G

Active Member
Joined
Sep 25, 2018
Messages
30
Location
Texas
Occupation
Engineer
cosmaar1 said:
Anyone ever change a hub seal on a 555e? Both of mine seem to be in bad shape as they leak oil down the backside of the front tire. It’s not terribly bad, but enough that I need to fix it soon.

I’ve looked over the manual and it seems to be straight forward, but wondered if anyone had any tips?

I also just realized the hubs take hydraulic oil for some reason. I’ve been putting gear oil in there. Whoops.
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One side of mine was leaking bad. I thought it was due to the bushing being worn so I bought the bushing o rings and seals. Once I got it apart, I couldn't find any failures of the parts. Turns out the vent was plugged forcing the oil out when it warmed up and pressurized. Cleaned vent. Problem solved. It was a straight forward job and I don't recall any hardship in doing it. Now, I always check vents first.
 
C

cosmaar1

Senior Member
Joined
May 14, 2020
Messages
523
Location
Ohio
Mike-G said:
One side of mine was leaking bad. I thought it was due to the bushing being worn so I bought the bushing o rings and seals. Once I got it apart, I couldn't find any failures of the parts. Turns out the vent was plugged forcing the oil out when it warmed up and pressurized. Cleaned vent. Problem solved. It was a straight forward job and I don't recall any hardship in doing it. Now, I always check vents first.
Click to expand...
My vent of the front axle was bad as well and I had oil coming out of both sides. I fixed that a while ago and there isn’t oil on the driver side anymore. However when I went to check the oil last week I noticed the passenger side was almost dry. Well now I know what the real cause was.
 
1

1998 555E

Well-Known Member
Joined
Apr 13, 2023
Messages
55
Location
United States
I had a lot of trouble with those as well. I used a quarter inch impact driver with a 5 mm hex socket along with heat cycles from a small map torch and WD-40 around the threads. I ended up buying new ones because of how chewed up they were from the impact. I also snapped the hex Allen type socket during this process. It was a pain.
 
C

cosmaar1

Senior Member
Joined
May 14, 2020
Messages
523
Location
Ohio
1998 555E said:
I had a lot of trouble with those as well. I used a quarter inch impact driver with a 5 mm hex socket along with heat cycles from a small map torch and WD-40 around the threads. I ended up buying new ones because of how chewed up they were from the impact. I also snapped the hex Allen type socket during this process. It was a pain.
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Well now I feel better knowing yours wasn’t a cake walk haha

I went and got my dad’s oxygen and acetylene tanks so I can heat them up. My little blue bottle of propane didn’t work.

I too thought of replacing the bolts. I haven’t stripped them yet, but I’m sure it will be forthcoming.
 
1

1998 555E

Well-Known Member
Joined
Apr 13, 2023
Messages
55
Location
United States
Just realized that I put the large hub seal in backwards on the previous pics. This is what is should look like installed correctly.
Resized_20240426_174852(1).jpg
 
C

cosmaar1

Senior Member
Joined
May 14, 2020
Messages
523
Location
Ohio
1998 555E said:
After you take your lug nuts off, there are two 5mm Allen head bolts that hold the planetary cover on. This is what the cover looks like off the machine. There is an o ring seal.
View attachment 310806
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1998, I very much appreciate you posting these. My huh rebuild was fairly simple minus a few issues but some of your pictures came in handy. Such as when I knocked my thrust rings off the bench and didn’t know the order.

Or trying to get that ring gear off. That was a saving grace.

Only other advice I will give y’all is when you go to put the ring gear back on, tighten the bolts in small increments and tighten the bolt opposite from the one you did previously. That way you are pressing the bearing in all around and not just in one or two spots.
 
NH575E

NH575E

Senior Member
Joined
Dec 30, 2015
Messages
1,193
Location
North, FL
Occupation
Retired Machinist
Mike-G said:
One side of mine was leaking bad. I thought it was due to the bushing being worn so I bought the bushing o rings and seals. Once I got it apart, I couldn't find any failures of the parts. Turns out the vent was plugged forcing the oil out when it warmed up and pressurized. Cleaned vent. Problem solved. It was a straight forward job and I don't recall any hardship in doing it. Now, I always check vents first.
Click to expand...
I have fixed several leaks by opening up stuck or clogged vents. Always the first thing I check too.
 
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