Hey Gents, so we had our left clutch quit on our D8H 46A15795. Removed the brake housing and ran the cat and applied pressure into the steering clutch and it’s leaking all around between bevel shaft bearing flange and hub. Tested pressure, it’s 275 psi. Removed the clutch and noticed the bearing flange/cage was worn so I had it speedy sleeved and machined back to where it supposed to be, tightened the bevel shaft bearings. Buttoned up the machine, and it still won’t disengage the clutch. Opened it up, it still leaks all around just as it did when we first looked into it. New seals were used but we noticed that they seat fully within the grooves. Is that normal?? How much leakage should we see?? Do the seals push against under pressure to create a better seal? Something looks off to me but it’s how the book says. Any advice is appreciated!!

Seems you left out the word "don't" seat fully in the grooves. Is it the 4M2571 seals your referring to?
Where did you source these seals?

"Old wrote:

Seems you left out the word "don't" seat fully in the grooves. Is it the 4M2571 seals your referring to?
Where did you source these seals?

Yes those are the seals I'm referring to. Seals are from CAT classic, and by fully seating within groove i mean they don't protrude past the steel at all.

Dug up these specs on the 4M2571 seals..

I'm at a loss as to how a speedy sleeve would fix? With seal grooves on one side and oil holes on the other how does that work???

Hi Team,
check you have no burrs raised at the edges of the seal ring grooves--these can destroy the sealing edges of the rings and could inhibit them expanding out to seal to the opposite sealing surface inside the bevel gear shaft bearing housing.

At the Dealer we sometimes used to turn out the scored bore in the brg. hsg. and sleeve them, I guess a speedy sleeve could work with suitable porting holes ground in after fitting.

From memory the seal rings are a butt end gap and I am sure I have seen up to around 3/32" end gap on some new Cat parts.

Another thing I have seen is when the steer. clutch actuator piston seal rings do not seem to seal correctly--lots of leakage when viewing the said area--is from the pistons being fitted in reverse to their designed orientation--the I think-- 1/4" thread puller bolt holes face out so as you can remove the steer. clutch actuator pistons easily. Surprisingly they sometimes get fitted incorrectly and I do not know why?

The Service Manual may show how to "roll" both the B. G. shaft brg. hsg. seal rings and the actuator piston seal rings so that they stay round and fit/stay below their running groove surfaces for safe installation. If the said data is not in the S. M. then a Serv. Mag. neither of which I have from this late a machine and time.

Hope this helps.
Cheers,
Eddie B.

Current 4M2571 seal rings...interlocking ends, limited expansion, square cross section.

Hi OM,
been a while but not all of the sealing used in these areas are hook type rings--BUT--thanks for extra data and correction for the bevel shaft seal rings.
They still need to be handled correctly to avoid flat spotting--distorting the rings so they do not initially seal well with each application of the clutch and so wear through at the higher egged areas.

Indeed, if the diameter of the sleeved area is too large in diameter and the hooks run out of travel the hook type rings will inhibit sealing until possibly a hook end breaks off.

Cheers,
Eddie B.

Although piston seals could be leaking that's not what the 4M2571 seals refer to.