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HOSE A 4Z8480 - Caterpillar



4Z8480 HOSE A Caterpillar parts HOSE
Rating:
76
Alternative (cross code) number:
CA4Z8480
4Z-8480
4Z8480
Caterpillar 4Z8480 HOSE A
Weight: 8 pounds 3 kg.

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Illustration 5 g02102306
Main relief valve (heavy lift)
(A) Adjustment screw
(L) Locknut
Loosen the locknut. Set the main relief pressure to 37000 500 kPa (5366 73 psi). Tighten the locknut.Note: Turn the adjustment screw clockwise in order to increase the pressure. Turn the adjustment screw counterclockwise in order to decrease the pressure.Note: Always make final pressure adjustments on pressure rise.
Verify the temporary main relief pressure setting with a second function. Move the joystick for the boom until the boom is at full BOOM RAISE position (full extension of the boom cylinder). The main relief pressure should be 37000 500 kPa (5366 73 psi).
Mark the original position of the line relief for the bucket cylinder head end (7).
Move the joystick for the bucket until the bucket is at the full BUCKET CLOSE position (full extension of bucket cylinder).
Check the pressure setting of the line relief for the bucket cylinder head end (7).
Loosen the locknut of the bucket line relief valve. Turn adjustment screw of the bucket line relief valve until the pressure reading at pressure tap (1) is 35000 kPa (5076 psi).
Move the joystick for the bucket until the bucket is at the full BUCKET CLOSE position (full extension of bucket cylinder).
Check the pressure setting of the line relief for the bucket cylinder head end (7).
Turn the adjustment screw of the bucket line relief valve until the pressure reading at pressure tap (1) is 37000 500 kPa (5366 73 psi).Note: Always make final pressure adjustments on the pressure rise.Note: In order to prevent over setting, the adjustment should be stopped immediately after the pressure becomes within specification.
Repeat Step 9 to Step 15 for the following line relief valves:
Line relief valve for bucket cylinder rod end
Line relief valve for stick cylinder head end
Line relief valve for boom cylinder rod end
Reset main relief valve pressure setting to the normal operating condition after the completion of the line relief test and adjust. Refer to Testing and Adjusting, "Relief Valve (Main) - Test and Adjust".Boom Cylinder Head End and Stick Cylinder Rod End
Note: A Boom Up Limit Solenoid override is required before testing the boom cylinder head end relief pressure.Note: A continuous relief of the valve for more than 10 seconds is not allowed.
Illustration 6 g03590033
Main control valve
(3) Main relief valve
(8) Line relief valve for the boom cylinder head end
(9) Line relief valve for the stick cylinder rod end
Mark the original position of the line relief valve for the stick cylinder rod end (9).
Loosen the locknut for line relief valve (9). Turn the adjustment screw clockwise by one quarter turn. Tighten the locknut.
Start the engine.
Use the monitor to override the Boom Up Limit Solenoid to 4000 kPa (580 psi)
Enter the "Service" Menu.
Enter password "9992".
Select "Overrides".
Override "Boom Up Limit Solenoid" to 4000 kPa (580 psi).
Place the hydraulic activation control lever in the UNLOCKED position.
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm


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