797F Off-Highway Truck Caterpillar

Torque Converter and Transmission Oil - Change

Usage:

797F LTZ

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Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact the skin.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat^® products. Dispose of all fluids according to local regulations and mandates.

Prepare the machine for maintenance. Refer to Operation and Maintenance Manual, "Prepare the Machine for Maintenance". Refer to step for maintenance that DOES NOT require the engine to be running.
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Illustration 1 g02005093
Remove filler cap (1) to prevent a vacuum in the sump.
Remove drain plugs (2) on the torque converter sump. Install two 100 mm (4 inch) long pipe nipples to open the internal drain valves. The outer diameter of the nipples should be 38.0 mm (1.50 inch). Drain the oil into a suitable container.
Remove drain plug (4) from the transmission housing. Install a 100 mm (4 inch) long pipe nipple to open the internal drain valve. The outer diameter of the nipple should be 38.0 mm (1.50 inch). Drain the oil into a suitable container.
Remove the pipe nipples. Clean the drain plugs and install the drain plugs.
Remove the filler strainer. Wash the cap and the strainer in clean, nonflammable solvent. Allow the cap and the strainer to dry. Install the strainer.
Inspect the cap seal. Use a new seal if the used seal is damaged.
Fill the torque converter sump to the top of the green range of upper sight gauge (3). Refer to Operation and Maintenance Manual, "Lubricant Viscosities". Refer to Operation and Maintenance Manual, "Capacities (Refill)".
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Illustration 2 g06191459

The engine shutdown switch is on the front bumper.
Use engine shutdown switch (5) to prevent the engine from starting. Crank the engine for approximately 15 seconds. The oil level will decrease as oil fills the system.
Add oil to the tank to raise the oil within the green range of the upper sight gauge.
Repeat Step 9 and Step 10 until the oil level stabilizes within the green range of the upper sight gauge.
Set the appropriate oil level at operating temperature. Refer to Operation and Maintenance Manual, "Torque Converter and Transmission Oil Level - Check".
Prepare the machine for maintenance. Refer to Operation and Maintenance Manual, "Prepare the Machine for Maintenance". Refer to step for maintenance that DOES NOT require the engine to be running.
Inspect component and area for signs of leakage. Make any necessary repairs.

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NOTICE

Failure to properly fill the torque converter sump after an oil change may cause damage to the power train system. Follow the procedure that is described above. The transmission direction and speed control MUST be left in NEUTRAL until the system is full.