HARNESS AS-ENGINE 2802789 - 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: 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 37200 1000 kPa (5400 145 psi). If the pressure gauge reading at pressure tap (1) is not within the specification, adjust the line relief valve.
In order to adjust the line relief valve, loosen locknut (14) on the boom line relief valve. Turn adjustment screw (15) until the pressure gauge reading at pressure tap (1) is 37200 1000 kPa (5400 145 psi).Note: In order to adjust the line relief valve pressure setting for the boom cylinder rod end, a temporary adjustment of the line relief valve for the bucket cylinder rod end must be performed.
Loosen locknut (14) on the line relief valve for the BUCKET OPEN function. Turn adjustment screw (15) by one half turn in a clockwise direction. Tighten locknut (14) on the line relief valve for the bucket cylinder.
Move the joystick for the bucket until the bucket is at the full BUCKET OPEN position (full retraction of the bucket cylinder). Hold the joystick for the bucket in this position. At the same time, move the joystick for the boom until the boom is at the full BOOM DOWN position (full retraction of boom cylinders). Hold the joystick for the boom in this position.
Check the pressure in the boom cylinder rod 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 37200 1000 kPa (5400 145 psi). If the pressure gauge reading at pressure tap (1) is not within the specification, adjust the line relief valve.
In order to adjust the line relief valve, loosen locknut (14) on the boom line relief valve. Turn adjustment screw (15) until the pressure gauge reading at pressure tap (1) is 37200 1000 kPa (5400 145 psi).
Tighten locknut (14) on the boom line relief valve.Note: Turn adjustment screw (15) clockwise in order to increase the pressure. Turn adjustment screw (15) counterclockwise in order to decrease the pressure.Note: Always make final pressure adjustment on pressure rise.
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