ENGINE AR-COMPLETE 3288034 - Caterpillar

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The oil drain valve is located under the hydraulic tank.
Remove the hydraulic tank access cover that is located under the upper structure. This will allow access to the drain valve.
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Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information that pertains to containing fluid spillage.
Remove the oil drain valve plug.
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Install a Swivel Hose with clear plastic tubing in order to open the drain valve. Drain the oil into a suitable container.
Remove the Swivel Hose in order to close the drain valve.
Inspect the O-ring. Replace the O-ring if wear or damage is evident.
Clean the drain plug. Install the drain plug.
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Open the access door that is located on the right side of the machine.
Clean the pump, the hydraulic lines, and the hydraulic tank.
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Remove the plug from the tube. Allow the oil to drain into a container.Note: Dispose of used filters and used fluids according to local regulations.
Inspect the O-ring. Replace the O-ring if wear or damage is evident.
Clean the plug. Install the plug and the O-ring into the drain port.
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(4) Bolts (5) Washers (6) Cover (7) Spring (8) Screen
Remove bolts (4), washers (5) and cover (6) .Note: Dispose of used filters and used fluids according to local regulations.Note: Do not allow spring (7) to fall back into the tank.
Remove spring (7) and screen (8) .Note: Refer to Operation and Maintenance, "General Hazard Information" for information on containing fluid spillage.
Wash the screen in a clean nonflammable solvent. Allow the screen to dry. Inspect the screen. Replace the screen, if the screen is damaged.
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(9) O-ring seal (10) O-ring seal
Inspect O-ring seals (9) and (10). Replace the O-ring seals if wear or damage is evident.
Install screen (8) and spring (7). Then install cover (6), washers (5), and bolts (4) .Note: Make sure that the O-ring seals and the spring are properly positioned during installation.
Fill the hydraulic system oil tank. Refer to Operation and Maintenance Manual, "Refill Capacities".
Inspect the O-ring seal on the filler plug for damage. Replace the O-ring, if necessary. Clean the filler plug. Install the filler plug.
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Note: Make no attempt to start the engine until the pump has been filled with hydraulic oil. Serious damage to the hydraulic components can result.
When the hydraulic oil has been replaced, the air must be removed from the hydraulic oil system. Use the following procedure to remove the air from the hydraulic oil system.
While the engine is stopped, remove the vent plug on the top of the pump. Leave the vent plug unattached for several minutes until the pump is filled with hydraulic oil. After the pump is filled with hydraulic oil, tighten the vent plug. Start the engine. When the engine is at low idle, fully raise the boom. Hold the boom in this position.
Stop the engine. Slowly lower the boom until the bucket is on the ground. This pressurizes the hydraulic tank.
Slowly loosen the vent plug for several turns until the hydraulic oil flows out of the opening for the vent plug. This