Re: 706 leak

Posted by Owen Aaland on February 15, 2007 at 19:00:53 from (65.165.246.11):

In Reply to: Re: 706 leak posted by Tarrpaper on February 15, 2007 at 10:34:18:

There are two seals that can be allowing the
leak on the front of the clutch housing. If it is
really leaking from the release bearing carrier
tube then the seal that is leaking is in the
carrier sealing on the PTO shaft. Too much
play between the support bearing and the
carrier can allow a seal to leak. This bearing
should be a light press fit into the carrier. This
leak will come out right in front of the release
bearing but behind the pressure plate cover.

Since your leak is dependent on the TA shift
position I think the problem is more serious.
The oil is leaking out from the high side clutch
in the TA. A new seal inside the IPTO shaft
may help but is not likely to really stop the leak
completely. I seen people put two seals in the
shaft but that really does not cure the problem.

When a TA is remanufactured a new bushing
is pressed into the front carrier housing.
Imperfections between this bushing and the
housing can cause oil to be sprayed against
the seal when the high side clutch is
engaged. Quality remanufacturers use a
bushing with a flange on the front so if they
leak, the oil is diverted 90 degrees away from
the seal instead of directly at the seal. This
problem usually shows up pretty quickly after
a TA is replaced.

A more common problem occurs with more
hours on the TA. This is the result of wear on
the inside of the bushing caused by the steel
sealing rings. If the end play on the input shaft
in not kept to a minimum the seal rings move
back and forth in the bushing causing the
wear. There are three seal rings on the shaft.
Oil is pressure is applied between the front
and middle for the high side clutch and
between the middle and rear for the low side
clutch. Wear allows the oil to come past the
rings. When the high side is engaged, oil
leaking past the front ring will be sprayed on
the seal. Oil leaking past the middle ring will
leak into the low side which is open to the
sump. When the low side is engaged the
same thing happens except that now oil
leaking past the rear ring just returns to the
sump and oil leaking past the middle ring now
leaks into the high side passage which is now
open the the sump and so no pressure is
applied againt the front ring. As a result the
leak only appears with the TA in high. The oil
from this leak will actually be coming out of the
front of the IPTO shaft, just ahead of the PPA
cover.

The first type of leak can be cured with a
simple clutch splt and replacing the seal and
probably rhe carrier. The second type, which I
think is what you have, means it is time for a
rebuilt TA assembly.

Replies:

• Re: 706 leak Tarrpaper 07:22:03 02/16/07 (0)

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