PISTON & ROD GP 10R4378 - Caterpillar

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact the skin.
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, NENG2500, "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".
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Remove filler cap (1) to prevent a vacuum in the sump.
Remove drain valve plug (2). Install a 88.0 mm (3.50 inch) long NPT pipe nipple to open the internal drain valve. The outer diameter of the NPT pipe nipple should be 25 mm (1 inch). Drain the oil into a suitable container.
Remove drain valve plug (3) and drain valve plug (4). Install a 88.0 mm (3.50 inch) long NPT pipe nipple to open the internal drain on both valves. The outer diameter of the NPT pipe nipple should be 25 mm (1 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 the upper sight gauge . Refer to Operation and Maintenance Manual, "Lubricant Viscosities". Refer to Operation and Maintenance Manual, "Capacities (Refill)".
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Type 1
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Type 2
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.The engine shutdown switch is on the front bumper.
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.
Lower the guard on the engine shutdown switch. Start the engine and operate the engine at an idle.
Add oil to the torque converter sump with the engine at an idle to bring the transmission and torque converter oil to the proper level. Refer to Operation and Maintenance Manual, "Torque Converter Sump Oil Level - Check".
Inspect the transmission and torque converter system for leaks. Make any necessary repairs.
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.