BRACKET AS 3389669 - Caterpillar

The following line relief valves are located on top of the main control valves: boom cylinder rod end (7), bucket cylinder head end (8) and stick cylinder head end (9). The line relief valve for bucket cylinder rod end (16) is located under the main control valves and opposite the line relief valve for bucket cylinder head end (8).Line relief valve (11) (boom cylinder head end) is located on boom drift reduction valve (10).Line relief valve (12) (stick cylinder head end) is located on stick drift reduction valve (13).
Illustration 5 g01201790
Line relief valve (typical example)
(14) Locknut
(15) Adjustment screw Note: Turn adjustment screw (15) clockwise in order to increase the pressure. Turn adjustment screw (15) 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 for the boom until the boom is at the full BOOM RAISE position (full extension of boom cylinders). Hold the joystick for the boom in this position.
Check the pressure in the boom cylinder head end on the pressure gauge at pressure tap (1).
Return the joystick for the boom to the NEUTRAL position.
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