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3. Raise the boom to a high angle (at least 70°) and measure the angle with the inclinometer.
Ensure the displayed angle matches the inclinometer reading within 0.2°. If the displayed angle
is incorrect, refer to
SECTION 3.10.4 SPAN CALIBRATION
.
3.4.2.3 Check Pressure Sensors
The Pressure sensors are calibrated during production. Pressure sensors may not be individually
replaced. Any serious problem will necessitate changing the entire computer unit.
1. Lower the boom until the boom hoist cylinder is fully retracted and on its stop.
2. Loosen the hydraulic connections to the pressure sensors to ensure zero pressure is present on
the sensors.
3. Enter the Calibration Mode and press the
PRESSURE MONITOR
button to view both sensor
pressures and net pressure.
4. Check the pressure values of both sensors. The Pressure values should be between -75 and
+75 PSI. If not, replace the computer unit.
5. Check the NETT pressure values of both sensors. This should be between -35 and +35 psi. If
not, replace the computer unit.
