help needed with 904
Okay so here's my latest dilemma I was able to get the first second drum together I think ok. Now I'm on the third reverse drum and it's the interseal that's giving me the hard time. I'll shoot a picture here and the inner seal that came out as the bottom right one and the one on top of it is the one I believe that matches it and the other two to the upper middle and left are the closest ones. I can tell on the big outer Seal there seem to be substantial wear on the seal either that or the new ones just bigger in exterior circumference. The outer seal with the ridge facing down fits fine without the inner seal, even though it's bigger than the old one. but the interseal was almost non-existent. It didn't protrude out much whatsoever and I can feel that this fits very tight on there on the inside. Either that or this is just the wrong seal?
Well Jason, it's been a long time so I'm not sure of your problem there.
I do seem to remember there were two types of seal that went inside the drum?
One was a lip seal where the lip faced down, and I think there was another one that was just a square ring with no lip.
The drum with a groove that has two depths uses the lip type seal, and the other just had a single depth groove and used the square one.
And I do remember the one that was square went in tight.
Check the groove in the drum and see if that makes sense.
In the meantime I'll see if I can find a pic.
Yea, I did remember that correctly.
If it has a single depth groove it takes the square ring.
If it has a groove that is cut two different depths it takes a lip seal with the lip facing down.
Something that might help which you kind of touched on was that you can put one seal at a time on and make sure it has a friction fit so you know it will seal.
And like I said before, the single square ring fits pretty tight to where the piston resists being installed.
Lots of lube on that outer seal and bore in the drum and try to work one side and then the other of the piston with solid down pressure and it should go in.
Also like I mentioned before, you can air test it using the pump stator with the rings on the stator.
