CYLINDER & LINES GP-BUCKET 1589020 - Caterpillar

Illustration 7 g00687275
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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(8) Bolts (9) Washers (10) Cover (11) Spring (12) Screen
Remove bolts (8), washers (9) and cover (10) .Note: Dispose of used filters and used fluids according to local regulations.Note: Do not allow spring (11) to fall back into the tank.
Remove spring (11) and screen (12) .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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(13) O-ring seal (14) O-ring seal
Remove O-ring seal (13) from the screen.
Inspect O-ring seals (13) and (14). Replace the O-ring seals if wear or damage is evident.
Install O-ring seal (13) on screen (12) .
Install screen (12) and spring (11). Then install cover (10), washers (9), and bolts (8) .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)".
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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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Remove the pressure cap.
Inspect the pressure cap. Clean the pressure cap. Replace the pressure cap if damage is evident.
Replace the pressure cap.
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(15) Drain hose (16) Connector (17) Seal (18) Negative flow control hoseNote: 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. To remove the air from the hydraulic oil system, follow Step 30.a through Step 30.g.
While the engine is stopped, remove drain hose (15), connector (16) and seal (17) from the top of the pump. Add hydraulic oil through the opening.
Check the condition of seal (17). If the seal is damaged, replace the seal.
After the pump has been filled with oil, install drain hose (15), connector (16) and seal (17) to the original locations.
Start the engine. When the engine is at low idle, fully raise the boom. Hold the boom in this position.
Slowly loosen negative flow control hose (18) until the air has been released from the pump.
Tighten negative flow control hose (18) .
Stop the engine. Slowly lower the boom until the bucket is on the ground. This pressurizes the hydraulic tank.
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(19) Vent plug
Slowly loosen vent plug (19) until the hydraulic oil flows out of the opening. This indicates that the air has been released from the pump.
Tighten vent plug (19) .
Start the engine. Operate the engine at idling speed for five minutes.
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Operate the joysticks in order to circulate the hydraulic oil. Lower the bucket to the ground so that the stick