SPROCKET-TRACK 4783479 - Caterpillar

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Remove the hydraulic tank filler cap.
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Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information on Containing Fluid Spillage.
The hydraulic tank drain valve is located at the bottom of the hydraulic tank. Open the drain valve and allow the hydraulic oil to drain into a suitable container.
Close the drain valve.
Change the hydraulic system filter and the hydraulic tank breather. Refer to Operation and Maintenance Manual, "Hydraulic System Oil Filter - Change".
Fill the hydraulic system oil tank. Refer to Operation and Maintenance Manual, "Lubricant Viscosities" and Operation and Maintenance Manual, "Refill Capacities".
Inspect the gasket on the hydraulic tank filler cap for damage. Replace the gasket, if necessary.
Install the hydraulic tank filler cap.
Start the engine and run the engine for a few minutes. The brake oil indicator light should go out. If the brake oil indicator light does not turn off, refer to Service Manual, RENR3565-00, "Testing & Adjusting", "Braking System Troubleshooting".
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Maintain the hydraulic oil level above the "ADD COLD" mark on the sight gauge. Add oil, if necessary.Note: The oil must be free of bubbles. If bubbles are present in the oil, air is entering the hydraulic system. Inspect the suction hoses and hose clamps.
Stop the engine.
If necessary, tighten any loose clamps and any loose connections. Replace any damaged hoses.