SEAL-O-RING 1G2519 - Caterpillar

Remove plug (6) from the tube. Allow the oil to drain into a container.
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.Hydraulic Tank Screen - Clean
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(7) Bolts
(8) Washers
(9) Cover
Remove bolts (7), washers (8), and cover (9).
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(10) Spring
(11) Screen
Remove spring (10) and screen (11).Note: Do not allow spring (10) to fall back into the tank.
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(12) O-ring seal
Remove O-ring seal (12) from the screen.
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(13) O-ring seal
Remove O-ring seal (13) from the tank.
Inspect O-ring seals (12) and (13). Replace the O-ring seals if wear or damage is evident.
Wash the screen in a clean nonflammable solvent. Allow the screen to dry. Inspect the screen. Replace the screen, if the screen is damaged.
Install O-ring seal (12) on screen (11).
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.Case Drain Filter - Clean
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(1) Hose
(2) Hose
(3) Case drain filter
(4) Tee
Remove hose (1) and hose (2) from tee (4). Remove tee (4).
Remove case drain filter (3) from the hydraulic tank.
Wash the screen of the case drain filter in a clean nonflammable solvent. Allow the filter to dry. Inspect the filter. Replace the filter if the filter is damaged.
Inspect the O-ring seal on the filter. Replace the O-ring seal if wear or damage is evident.
Install the filter in the hydraulic tank. Tighten the filter to 175 26 N m (129 19 lb ft).
Install the tee onto the filter. Tighten the tee to 65 10 N m (48 7 lb ft).
Install the two hoses onto the tee.Hydraulic System Oil - Fill
Fill the hydraulic system oil tank. Refer to Operation and Maintenance Manual, "Capacities (Refill)".
Inspect the O-ring seal on the filler cap for damage. Replace the O-ring, if necessary. Clean the filler cap. Install the filler cap.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.Main Pump and Hydraulic System Air Purge
Access the hydraulic pump. The hydraulic pump is located behind the right access door.
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(14) Hose
(15) Connector
(16) Elbow
While the engine is stopped, remove hose (14), elbow (15), and connector (16) from the top of the pump. Add hydraulic oil through the opening.
Check the condition of the seals. If a seal is damaged, replace the seal.
After the pump has been filled with oil, install drain hose (14), connector (15), and seal (16) to the original locations.
Start the engine. When the engine is at low idle, raise the boom. Hold the boom in this position.
Stop the engine. Slowly lower the boom until the work tool is on the ground. The hydraulic tank will pressurize.
Slowly loosen hose (14) until hydraulic oil flows from the connection. Oil flowing from the connection indicates that the air has been released from the pump.
Tighten hose (14).
Start the engine. Operate the engine at idling speed for 5 minutes.
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