I have a caterpillar D4D dozer serial # 82J1183 I need to change the transmission fluid and the stuff that came out is a very thick white fluid, what would I use to replace this I can't find anything similar?
Is this the fluid in the powershift portion of the transmission, or does it have hydrostats? I think Cat is running hydros up to the D5, maybe even D6 sizes. If it is thick and white you have a water contamination issue that needs to be addressed first. Give a few more details, and I'll try and help more.
Oh wow, didn't realize how old that beauty was...but I still can't think of any fluid that would be thick and white without water contamination!
The dozer uses TDTO for the transmission. The attached doc is the current Cat lubrication recommendations. I think the D4 is on pages 45-46. You can use other commercial TDTO oils as long as they comply with the specification.
The increased vis and white color that you saw is water contamination. A TDTO contains an additive that will act as an emulsifier so you get the milkshake look without water separation.