DELIMBER AR 1754261 - Caterpillar

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Pump compartment for the 320C and the 322C (26) Pressure tap (idler pump) (27) Pressure tap (drive pump) (37) Pressure tap (power shift)
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Pump compartment for the 325C (26) Pressure tap (idler pump) (27) Pressure tap (drive pump) (37) Pressure tap (power shift)
Attach a 38000 kPa (5500 psi) pressure gauge to pressure tap (27) .Note: Refer to Illustration 1 for the 320C and the 322C machines.Note: Refer to Illustration 2 for the 325C machines.
Illustration 3 g00994459
Stop valve
Close the stop valves that are mounted on each side of the stick. A stop valve is on each side of the stick. This will prevent oil flow to the work tool during this procedure.
Start the engine.
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 the machine for engine rpm settings.
Set the pilot pressure to the specifications that are in Testing and Adjusting, "Relief Valve (Pilot) - Test and Adjust" for the machine.
Warm the hydraulic oil to 55° 5°C (131° 9°F).
Set the main relief valve to specifications. Refer to Testing and Adjusting, "Relief Valve (Main) - Test and Adjust" for the machine.
Perform the calibration for the proportional solenoid valve for negative flow control. Refer to Testing and Adjusting, "System 3 Prime: Solenoid Valve (Proportional Reducing) - Calibrate (Negative Flow Control)" for the Tool Control System.
Calibrate the power shift pressure. Refer to Testing and Adjusting, "Proportional Reducing Valve - Calibrate (Power Shift)" for the Engine and Pump Control System.
Press and hold the device for activation.
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The illustration is only a partial schematic. Refer to Systems Operation, "System 3 Prime: One-Way/Two Pump/ Pedal" for the Tool Control System for a more complete schematic. (1) Work tool solenoid valve (2) Work tool pressure switch for attachment control valve (3) Line relief valve that is mounted near the boom foot (4) Auxiliary control valve (5) Main control valve (6) Attachment control valve (8) Line relief valve that is mounted on auxiliary control valve (13) Electronic foot control (14) Hydraulic tank
Check the pressure setting at pressure tap (27) for line relief valve (3) that is mounted near the boom foot .
Release the device for activation.
The relief valve pressure setting for the work tool is 20600 1500 kPa (2990 220 psi). If the relief valve pressure setting for the work tool is not within the specification, adjust the relief valve pressure setting for the work tool.
Illustration 5 g00994456
(15) Locknut (16) Adjustment screw
In order to adjust the relief valve for the work tool, loosen the locknut. Then turn the adjustment screw until the pressure gauge reading at pressure tap (27) is 20600 1500 kPa (2990 220 psi).Note: Turning the adjustment screw clockwise increases the pressure. Turning the adjustment screw counterclockwise decreases the pressure.Note: Always make final pressure adjustments on pressure rise.
Tighten locknut (15) to a torque of 50 10 N m (37 7 lb ft).