ELBOW 0037215 - Caterpillar

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Open the rear access door on the left-hand side of the machine.
Remove hydraulic tank filler cap.
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Remove the rear cover plate.
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Hook a hose up to the drain valve of the hydraulic tank and drain the hydraulic oil into a suitable container.
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Install the rear cover plate .
Change the hydraulic system filters. Refer to Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace".
Fill the hydraulic system oil tank. Refer to Operation and Maintenance Manual, "Lubricant Viscosities" and Operation and Maintenance Manual, "Capacities (Refill)".
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Install the hydraulic cap.
Start the engine and run the engine for a few minutes.
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Maintain the hydraulic oil level above the "ADD" 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 the hose clamps.
Stop the engine.
If necessary, tighten any loose clamps and any loose connections. Replace any damaged hoses.