HOSE 3647781 - Caterpillar

Take extreme care to insure the cleanliness of the hydraulic oil. Keep the hydraulic oil clean in order to extend the component life and assure the maximum performance.
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Open the door to the engine compartment.
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Remove the hydraulic tank cap (1) and the screen (2) .
Wash the hydraulic tank cap and the screen in clean, nonflammable solvent.
Install the screen.
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Connect a hose to the hydraulic oil tank drain valve. The drain valve is located on the bottom of the hydraulic oil tank.Note: The hydraulic oil tank contains 80 L (21.1 US gal) of hydraulic oil. Drain the oil into a suitable container. Dispose of the used oil in a proper manner.
Close the hydraulic oil tank drain valve. Remove the hose.
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Disconnect the two hoses.
Remove the two strainers. Clean the strainers in a nonflammable solvent. Dry the strainers with air.
Install the two strainers.
Refill the hydraulic tank with clean, filtered hydraulic oil. Refer to the Operation and Maintenance Manual, "Refill Capacities and Lubricant Viscosities".
Add the oil through the filler tube. Clean the cap and install the cap.
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Maintain the oil level at the level mark on the decal. The decal is beside the sight gauge.