BODY AS. - LH 2880980 - 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 plug (4) .
Inspect the O-ring. Replace the O-ring if wear or damage is evident.
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Install swivel hose (5) with clear plastic tubing.
Loosen drain plug (6) in order to drain the oil.
Drain the oil into a suitable container.
After the oil has been drained, tighten drain plug (6) to a torque of 110 15 N m (81 11 lb ft).
Remove the swivel hose.
Clean plug (4) and install the plug. Tighten the plug to a torque of 90 8 N m (66 6 lb ft).
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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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(7) Bolts (8) Washers (9) Cover (10) Spring (11) Screen
Remove bolts (7) , washers (8) and cover (9) .Note: Dispose of used filters and used fluids according to local regulations.Note: Do not allow spring (10) to fall back into the tank.
Remove spring (10) and screen (11) .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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(12) O-ring seal (13) O-ring seal
Inspect O-ring seals (12) and (13) . Replace the O-ring seals if wear or damage is evident.
Install screen (11) and spring (10) . Then install cover (9) , washers (8) , and bolts (7) .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, "Capacities (Refill)".
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, loosen the hose coupling on the side of the pump. Leave the hose coupling unattached for several minutes until the pump is filled with hydraulic oil. After the pump is filled with hydraulic oil, tighten the hose coupling. Start the engine. When the engine is at low idle, fully raise the boom. Hold the boom in this position.
Stop the engine. Slowly