793B Off-Highway Truck Caterpillar

The proper lubricant viscosity grade is determined by the minimum outside temperature when the machine is started. The proper lubricant viscosity grade is also determined by the maximum outside temperature while the machine is operated. Use the column that is called "Min" to determine the lubricant viscosity grade to use when you start a cold machine and when you operate a cold machine. Use the column that is called "Max" to determine the lubricant viscosity grade to use when you are operating the machine at the highest temperature that is anticipated.

Oil viscosity in the differentials and in the final drives should not be based solely on ambient temperatures. The duration of continuous operation and oil temperatures during operation should also be considered. Machines that are operated continuously should use the oils with higher viscosity in the final drives and in the differentials in order to maintain the highest possible oil film thickness. Consult your dealer if additional information is needed.

Note: Multigrade oils should not be used in the transmission system or in the system for the hoist, the torque converter and the brakes. Oils that use friction modifiers should not be used in the transmission system or in the system for the hoist, the torque converter and the brakes. Use TO-4 oils in these systems.

When the machine is operating below −20°C (−4.0°F), use Operation And Maintenance Manual, SEBU5898, "Cold Weather Recommendations". This manual is available from your Caterpillar dealer.

Cat FDAO SYN, Cat FDAO SAE 60, or commercial oil that meets Cat FD-1 SAE 60 is preferred in Differential, Front Wheels, and Final Drives. Cat FDAO SYN is the preferred oil for extremely cold or hot environments, for maximum component life, and for extending the rear axle oil change intervals.

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NOTICE
If the ambient temperature at engine start-up or during operation is below −10°C (14°F), perform the procedures in Operation and Maintenance Manual, "Differential Warm-up and Break-in". Check the differential compartment and the final drive compartment for the proper fluid level. Failure to warm up the oil or improper lubrication levels prior to operation will cause damage to the machine.

If the ambient temperature is below −25°C (−13°F) (below −35°C (−31°F) for Cat FDAO SYN), consult your Cat dealer for instructions. Failure to warmup the oil prior to operation will damage the machine.

Table 1

Lubricant Viscosities for Ambient Temperatures
Compartment or System	Oil Type and Classification	Oil Viscosities	°C		°F
			Min	Max	Min	Max
Engine Crankcase	Caterpillar Multigrade DEO Multigrade API CG-4 Multigrade API CF-4	SAE 0W20	−40	10	−40	50
		SAE 0W30	−40	30	−40	86
		SAE 5W30	−30	30	−22	86
		SAE 5W40	−30	40	−22	104
		SAE 10W30	−20	40	−4	104
		SAE 15W40	−15	50	5	122
Transmission	Caterpillar TDTO Caterpillar TO-4	SAE 0W20(1)	−40	10	−40	50
		SAE 0W30(1)	−40	20	−40	68
		SAE 5W30(1)	−30	20	−22	68
		SAE 10W	−20	10	−4	50
		SAE 30	0	35	32	95
		SAE 50	10	50	50	122
Steering Hydraulic System	Caterpillar HYDO Caterpillar DEO Caterpillar TDTO Caterpillar MTO API CG-4 API CF-4 API CF Caterpillar TO-4	SAE 0W20	−40	40	−40	104
		SAE 0W30	−40	40	−40	104
		SAE 5W30	−30	40	−22	104
		SAE 5W40	−30	40	−22	104
		SAE 10W	−20	40	−4	104
		SAE 30	10	50	50	122
		SAE 10W30	−20	40	−4	104
		SAE 15W40	−15	50	5	122
		Caterpillar MTO	−25	50	5	104
Hoist, Torque Converter and Brake System	Caterpillar TDTO Caterpillar TO-4	SAE 0W20(1)	−40	40	−40	104
		SAE 10W	−20	50	−4	122
Differential, Front Wheels and Final Drives	Cat FDAO Cat FDAO SYN Cat FD-1	SAE 60	-10	50	14	122
		Cat FDAO SYN	−10	50	14	122

(1)

First Choice: Oils of full synthetic base stock without viscosity index improvers that meet the performance requirements of the TO-4 specification for the SAE 30 viscosity grade. Typical lubricant viscosity grades are SAE 0W30, SAE 5W30 and SAE 0W20. Second Choice: Oils with a TO-4 type additive package and a lubricant viscosity grade of SAE 0W30, of SAE 5W30 or of SAE 0W20.