MARKER-TERMINAL 4605421 - Caterpillar

Machine Preparation
The following procedures must be completed before performing the calibration.
Set the pilot pressure to the specifications in Testing and Adjusting, "Relief Valve (Pilot) - Test and Adjust" for the machine.
Calibrate the power shift pressure. Refer to Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Power Shift Pressure)" for the machine.
Calibrate the attachment valves. Refer to Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Attachment Valves)" for the Tool Control System.
Calibrate the flow limit valves. Refer to Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Flow Limit Valves)" for the Tool Control System.
Position the machine on level ground and stop the engine.
Illustration 4 g03602396
Stop valves for high-pressure oil delivery to the work tool (typical example)
Close the stop valves that are mounted on each side of the stick in order to prevent oil flow to the work tool during this procedure.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release" for the machine.
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Pump compartment
(1) Pressure tap (delivery pressure for drive pump)
(2) Pressure tap (delivery pressure for idler pump)
(3) Pressure tap (power shift pressure)
Attach both 41,368 kPa (6,000 psi) pressure sensors to pressure tap (1) and pressure tap (2).
Connect a 3445 kPa (500 psi) pressure sensor to pressure tap (3) to monitor power shift pressure.
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 engine rpm settings.
Increase the hydraulic oil temperature to 50° 10°C (122° 50°F). Temporary Setting of the Main Relief Valve
A temporary setting of the main relief valve is required before any line relief valves can be adjusted.
Move the joystick for the boom until the boom is at the full BOOM RAISE position (full extension of boom cylinder).
Check the main relief valve pressure setting at pressure tap (1) or pressure tap (2).
Be sure that the main relief valve pressure is set at the pressure specification.