VANE PUMP GROUP 1U0422 - Caterpillar

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Main control valves (front view) (12) Line relief valve (boom cylinder rod end) (13) Line relief valve (bucket cylinder head end) (14) Line relief valve (stick cylinder head end) (15) Line relief valve (boom cylinder head end) (16) Line relief valve (bucket cylinder rod end) (17) Line relief valve (stick cylinder rod end)The following line relief valves are located on top of the main control valves: boom cylinder rod end, bucket cylinder head end and stick cylinder head end. The following line relief valves are located on the bottom of the main control valves: boom cylinder head end, bucket cylinder rod end and stick cylinder rod end
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Line relief valve (typical example) (19) Locknut (20) Adjustment screwNote: Turn adjustment screw (20) clockwise in order to increase the pressure. Turn adjustment screw (20) counterclockwise in order to decrease the pressure.Note: After relief valve adjustments, cancel Service Mode.Note: Return the main relief valve pressure to the specified setting after Testing and Adjusting any line relief valve. Refer to Testing and Adjusting, "Relief Valve (Main) - Test and Adjust" for the main relief valve pressure setting.Adjustment (Boom Cylinders)
To adjust the line relief valve pressure setting of the boom cylinder head end, move the joystick