CASE AS 3408985 - Caterpillar

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, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Operate the machine for a few minutes in order to warm the hydraulic oil.Park the machine on level ground. Lower the bucket to the ground and apply slight downward pressure. Engage the parking brake and stop the engine.
Illustration 1 g00268301
The hydraulic tank is located on the right side of the machine. Press the hydraulic tank breaker relief valve in order to relieve any tank pressure.
Illustration 2 g00268308
Remove the hydraulic tank filler cap and the filler strainer. Wash the filler cap and the strainer in a clean, nonflammable solvent. Install the strainer.
Inspect the gasket on the hydraulic tank filler cap for damage. Replace the gasket, if necessary.
Illustration 3 g00268315
Remove the drain plug from the bottom of the hydraulic tank. Wash the drain plug in a clean, nonflammable solvent.
Install a 6B-3156 Pipe Nipple with a hose in order to unseat the internal drain valve. Allow the hydraulic oil to drain into a suitable container.
Never start the engine while the hydraulic oil tank is being drained or while the hydraulic oil tank is empty. Excessive wear and damage to the hydraulic components can occur.
Remove the pipe nipple in order to close the drain valve. Install the drain plug.
Replace the hydraulic oil filter.ReferenceRefer to Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace" for the correct procedure.
Illustration 4 g00634961
Fill the hydraulic tank with clean oil. Make sure that the oil level is at the "FULL" mark on the sight gauge. Install the filler cap.ReferenceRefer to Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the correct type of oil and for the correct amount of oil.
Start the engine and run the engine for at least ten seconds. Then, stop the engine and add hydraulic oil to the tank until the oil level is at the "FULL" mark on the sight gauge. Install the filler cap.
Start the engine and run the engine at low idle. Cycle the implements so that all hydraulic systems are filled with oil.Note: If the alert indicator for a low oil level comes on, stop the engine and immediately add oil to the hydraulic tank. The oil level should not be below the suction ports in the hydraulic tank while the engine is running.
Add hydraulic oil to the tank until the oil level is at the "FULL" mark on the sight gauge.
Stop the engine. Top off the hydraulic tank so that the oil level is at the "FULL" mark on the sight gauge. Install the filler cap.Note: The oil must be free of air bubbles. If air bubbles are present in the hydraulic oil, air is entering the hydraulic