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Dale, If you are replacing a Stemco two piece seal with a Scotseal or National one piece seal, be sure to remove the wear ring that is used as a sealing/wear surface on the spindle with the two piece seal that Stemco makes, you can pull the one piece seal up over the wear ring but this will ruin the new seal. On another note, if you overfill, the excess oil will usually leak out through the weep hole in the hub cap plug.Quote:
Originally Posted by Roadrunner
Jon, I have just been turning my brake adjustment until there is no pressure on the cam.Quote:
Originally Posted by Jon Wehrenberg
Dale, Did you have a good way to remove the hub? I used a floor jack on the driver hubs, they are a beast for weight.
I suggested the floor jack to Dale F. I did forget to mention that when installing it is critical to align the seal so as the hub is slid back into position nothing is levering against it and that both bearings are in place to keep the hub perfectly aligned. The seal is fragile and if it gets deformed it will leak.
Jon, that was a very important part to leave out. :)
I don't remember removing the brake drum, but I assume I had to use the floor jack. I removed the spindle without any assistance.
I replaced both of them using the assistance of a floor jack. I did not have the outside bearing in when I slid the spindle back on the axle housing, so I hope I didn't deform the seal. If it leaks, we know who I can blame since Jon didn't mention about having both bearings in when I slid the seal on. Or maybe I can blame this on my parents for something they did or did not do when I was a child!!
Orren,
I replaced a one-piece seal with another one-piece. The one that was in there may have been leaking because no one told the installer to make sure he had both bearings in the housing when he slid the seal in place.
I am going to recheck the oil in the differential this morning to make sure the level is correct.
It is not hard to get the inner bearing cocked on the spindle just slightly enough to make it feel kike the hub is back tight when it is not.
When reinstalling tighten the outer nut with a cheeter bar and crank it down as tight as you possibly can then before you back it off take a drift and a sledge and give the hub a wack or two and sometimes what you thought was tight will be sloppy again due to the inner bearing getting straight.
From that point there are numerous techniques to do the final adjustment.
Some back the nut out 1/2 turn releasing the bearings and then tightening back 1/4 turn, this is what I do for the drive hub.
Some back it off and tighten the nut by hand as tight as you can get it and leave it there, this is what I do for the tag and steer hub.
Some use a tourque rating and wrench.
Whaterer method make sure your inner bearing is completly seated.
One thing I also do is count the exposed threads beyond the outer nut before you disassemble it so you have a good idea when you put it back togeather if you have completly seated the bearings.
I couldn't get my break drums broke loose so I had to remove the whole assembly at once, it's one heavy item when it's all together.
Joe, I torqued the inner nut then backed off a little. The outer nut I torqued down and made sure I had the same exposed threads as when I started.
Dalej, I can't imagine having to remove the whole thing at one time. That would be heavy! In retrospect, I don't think I used the floor jack when I took off the drum or the spindle. I did use it to replace each of them.
Actually to replace a hub seal you do not even have to take off the wheels.
Joe posted a long time ago he uses two sheets of steel with oil or grease between them and the axle jacked up enough so the tires are barely touching the top sheet of steel. Then with the axle nuts off he just slides the entire assembly off and out of the way to get at the seal.
He reverses the process to put it back together.
There is a dual wheel lifting device with a hydraulic jack that Prevost uses in lieu of the two sheets of greased steel. If you replace a lot of seals this is probably the way to go, but with that much mass I am very uncomfortable with accidently banging on the back of the seal when installing it and not realizing it has been damaged.
I disassemble everything, including the brake drum because I can't and won't handle that much weight by myself, and because I have better control putting the hub back on. So far I have never had a seal I have replaced leak by doing it my more time consuming way.