WHEEL-BLOWER 1910979 - Caterpillar

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Main control valve (bottom view) (12) Line relief valve (stick cylinder rod end) (13) Stick drift reduction valveThe line relief valve (stick cylinder head end) (12) is located on stick drift reduction valve (13).
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Line relief valve (typical example) (14) Locknut (15) Adjustment screwNote: 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.
The pressure gauge reading should be 36800 1500 kPa (5340 220 psi). If the pressure gauge reading at pressure tap (1) is not within the specification, adjust line relief valve (11) .
In order to adjust line relief valve (11), loosen locknut (14) on the boom line relief valve. Turn adjustment screw (15) until the pressure gauge reading at pressure tap (1) is 36800 1500 kPa (5340 220 psi).Note: