TO4 or TO2 transmission oil

[FWD]

I have a Dresser TD9-H dozer. It has 2900 hours on it and I have put on about 950 hours of that. The previous owner changed the oil in the transmission and differential steering clutch area at around 1000 hours ago. The previous owner gave me a service record of it since new. The service manual says to change that oil at 1000 hours, so that's what I intend to do. I have changed the pressure filter several times since I had it. The information on the Shell website says to use Shell Spirax S4CX 10W oil which is a TO4 oil and my distributor has in stock. The owners manual dated 1993 says to use TO2 oil. Perhaps there was no TO4 at that time. The dozer is a 1998. Would it be okay to go with the TO4?
FWD

 

[dblaneyfan]

Here is a Cat document that may shed some light for you:

https://parts.cat.com/wcs-static/pdfs/TO4+06-23-06.pdf

Short answer, TO-2 is obsolete, TO-4 spec is the updated replacement for Cat equipment, would ass-u-me the same for Dresser.

Best

 

[Nige]

There was no TO-4 back in the day, the standard was TO-2. You should have no problem using TO-4 unless someone with experience specific to your particular model says different.