Cat d5 direct drive trans fluid

TO-2 spec is obsolete, replaced by TO-4 specification. Claimed to improve clutch wear by 45%, improves control of gear and pump wear. Recommendation for the D5 is SAE 30 weight.
Seems you have a leaking transmission input shaft seal.

[quote="Old Magnet"]TO-2 spec is obsolete, replaced by TO-4 specification. Claimed to improve clutch wear by 45%, improves control of gear and pump wear. Recommendation for the D5 is SAE 30 weight.
Seems you have a leaking transmission input shaft seal.[/quote]

Is that a seal that can be replaced without pulling the transmission?

Yes, remove drive shaft then transmission input shaft flange to access seal.

Magnet,

I finally got some good weather and began to work on this. The O-rings that CAT sold me were 2H-3927 and 2H-3928 according to the schematic. However, I find a seal behind this cover instead of O-rings.
[attachment=52611]IMG1.jpg[/attachment]

[attachment=52612]IMG2.jpg[/attachment]

[attachment=52613]IMG3.jpg[/attachment]

My question is did they sell me the wrong thing? I looked at the schematic and it showed 2 o-rings behind this cover. My transmission is stamped as such:

[attachment=52614]IMG5.jpg[/attachment]

I guess this is an actual D5 transmission.

Once I got the cover off I found a big Timken bearing. Does it actually come out? I'd like to check it while I am here if it comes out toward the front.
[attachment=52615]IMG4.jpg[/attachment]

Thanks in advance for any guidance,
Ken

Looks like those rings go around the the outside of that bearing. The seal is correct.

The 2H3927 0-ring goes under the 2-bolt washer at the end of the shaft.
The 2H3928 0-ring goes between the cover with the 3J0365 seal and the bearing cage.
If you want to inspect the dual thrust bearing you will need to use 3/8-16 jacking screws to remove the bearing cage then press the bearing out of the cage.

[quote="Old Magnet"]The 2H3927 0-ring goes under the 2-bolt washer at the end of the shaft.
The 2H3928 0-ring goes between the cover with the 3J0365 seal and the bearing cage.
If you want to inspect the dual thrust bearing you will need to use 3/8-16 jacking screws to remove the bearing cage then press the bearing out of the cage.[/quote]

ok. I think most of my confusion is explained now. There was NO "2-bolt washer" on the end of the shaft. Missing parts I guess.
There was NO gasket nor o-ring behind the seal cover. So not finding the old parts was real confusing. The only parts present were in my photos.

So if the 2H3927 and the 2-bolt washer were missing, that would be my leak that I am trying to fix....Perhaps?

I'll have to acquire all the missing parts.

[quote="Old Magnet"]The 2H3927 0-ring goes under the 2-bolt washer at the end of the shaft.
The 2H3928 0-ring goes between the cover with the 3J0365 seal and the bearing cage.
If you want to inspect the dual thrust bearing you will need to use 3/8-16 jacking screws to remove the bearing cage then press the bearing out of the cage.[/quote]

ok. I think most of my confusion is explained now. There was NO "2-bolt washer" on the end of the shaft. Missing parts I guess.
There was NO gasket nor o-ring behind the seal cover. So not finding the old parts was real confusing. The only parts present were in my photos.

So if the 2H3927 and the 2-bolt washer were missing, that would be my leak that I am trying to fix....Perhaps?

I'll have to acquire all the missing parts.

[quote="kharville"]ok. I think most of my confusion is explained now. There was NO "2-bolt washer" on the end of the shaft. Missing parts I guess.
There was NO gasket nor o-ring behind the seal cover. So not finding the old parts was real confusing. The only parts present were in my photos.

So if the 2H3927 and the 2-bolt washer were missing, that would be my leak that I am trying to fix....Perhaps?

I'll have to acquire all the missing parts.[/quote]

Yes, the missing two bolt washer/retainer & 0-ring would allow oil to leak along the splines. Also allow the shaft to float.
The bolts are a 6F7030 and the lock for the bolts is a 9M1367.
The washer/retainer is a 5M7339