HARNESS AS-SWITCH 4199828 - Caterpillar

Transmission/Drive Train Oil (TDTO) is balanced in order to give maximum frictional material service life in Caterpillar transmissions. TDTO exceeds the requirements for the Caterpillar TO-4 oil specification which includes the frictional requirements and gear wear requirements. TDTO is offered in different lubricant viscosity grades for maximum service life of components at high ambient temperatures and heavy duty cycles. For maximum transmission service life and performance, Caterpillar recommends Caterpillar Transmission/Drive Train Oil (TDTO).
Table 1
Caterpillar TDTO
Lubricant Viscosities For Operating Temperatures    
Cooling of Transmission     Oil Viscosities     Minimum Temperature     Maximum Temperature    
Raw/Seawater     SAE 30    
-15 °C (5 °F)    
80 °C (176 °F)    
SAE 50
-5 °C (23 °F)    
95 °C (203 °F)    
Jacket Water     SAE 50    
-5 °C (23 °F)    
95 °C (203 °F)    Contact your Caterpillar dealer for part numbers and for sizes of available containers.
This oil is formulated for transmissions and drive trains only, and should not be used in engines. Shortened engine life will result.
Caterpillar Gear Oil (GO) is not the same as Caterpillar Transmission/Drive Train Oil, and does not meet Caterpillar's specifications for TO-4 oil. Caterpillar GO or commercial gear oils should not be used in compartments which specify TO-4 oil.
Caterpillar Transmission/Drive Train Oils
If Caterpillar Transmission/Drive Train Oil is not used, commercial oils meeting the Caterpillar TO-4 specification must be used in Caterpillar marine transmissions. Use TO-4 Specification Oils that are single grade only.Commercial Marine Transmissions
For marine transmissions which are not manufactured by Caterpillar, refer to the lubrication recommendation of the OEM for the marine transmission or the vessel.