Usage:
768B (79S),
768C (02X),
772 (11S),
772B (64W),
776 (14H),
776B (6JC),
776C (2TK),
776D (5ER),
784B (5RK) Tractors;
769 (99F),
769B (99F),
769C (01X),
769D (5TR),
771C (3BJ),
771D (6JR),
773 (63G),
773B (63W),
773D (7ER),
775B (7XJ),
775D (6KR),
777 (84A),
777B (4YC),
777C (4XJ),
777D (3PR),
785 (8GB),
785B (6HK),
789 (9ZC),
789B (7EK),
793 (3SJ),
793B (1HL),
793C (4AR) Trucks
This Service Magazine Article should replace the previous article published October 28, 1996, "Higher Viscosity Power Train Oil Should Be Used in Certain Applications".
Machines that are operated continuously should use higher viscosity oils in the final drives and differentials to maintain the highest possible film thickness.
Monograde SAE 60 oils must comply to the CATERPILLAR TO-4 specification and are available through some suppliers for these compartments. Oil viscosity used in Off-Highway Truck differentials and final drives should not be based solely on ambient temperatures noted in operation and maintenance manuals, but should also be based on the duration of continuous operation and oil temperatures maintained throughout the duration. Operation & Maintenance Manuals for all models listed above will be updated to reflect this change.
Consult your dealer if additional information is needed.