Good Day All. Attached pic illustrates. I am topping off trans gear oil and wanted be solid sure of this. Oil is about one inch from full when checked (screwdriver on dip stick). Wrench sitting on trans gear add?? Just wanted a lil input plz if someone has seen a lot of these and also exactly best type oil to add. Thank you all always.

The d7-3t transmission use 80/90 gear oil

Hi John,
scan below shows you are on the money with check and fill points.
Cheers,
Eddie B.

Gemdozer and EDB Thanks for commenting. I have three books (so far) and none had the express detail of the scan you provided. Is there a lubrication only type book for these. My 3T # is 20616.

There is a grey covered Operation And Maintenance Instructions book (there is generally one for each machine and its attachments) that I have here that covers 7M1 to 7M9999 and 3T1 to 3T28058, Form No 10481-6. The -6 means later edition number with newer data added as deemed by Cat.
Generally the higher the - number the better the data to cover improvements to the product etc. I do not know if there are later editions than this one.
Cheers,
Eddie B.

How much gear oil does it take? Will be week before i have operators manual

The transmission have 11 gals.oil gear

Op and maintenance manuals on ebay.

The book you really need is the Operation and Maintenance Instructions. This is the capacities page from it:

I do have a copy for sale; if you are interested, send me a PM.
Craig