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W450311 Rev C 2/13
3. Check the zero of the extension sensor with the boom fully retracted. Enter the Calibration
Mode and use the “SPAN” command. Select sensor No. 2 to view the extension value in feet.
The value of extension must be between -0.2 and +0.2, with the boom fully retracted. If the
extension value is incorrect, refer to ENTERING THE CALIBRATION MODE. Fully telescope
the boom and ensure the displayed boom length value matches the maximum length of the
boom. If the length value is incorrect, follow the EXTENSION SPAN procedure in
CALIBRATING SPAN OF EXTENSION AND ANGLE.
2.4.2.2 Check Main Boom Radius
NOTE: The required accuracy of taped radius measurements is within 0.1 feet. When taking radius
measurements use a good quality tape that does not stretch. The tape should be graduated in feet
and tenths of a foot. Always measure between the swing center of the crane and the hook line,
using a single part of line with the crane centered over front (rough terrain) or centered over rear
(truck crane).
1. Fully retract the boom and ensure the crane configuration is correctly set up.
2. Raise the boom to about 45° and measure the radius. The measured radius must match the
displayed radius within + 0.5 ft. If it does not match, refer to CALIBRATING THE ANGLE
SENSOR ZERO.
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, follow the angle span calibration procedure in CALIBRATING SPAN OF
EXTENSION AND ANGLE.
2.4.2.3 Check Boom Angle
NOTE: The required accuracy of measured angles is within 0.2°. When taking boom angle
measurements use a good quality inclinometer. Many inclinometers are only accurate at 0° (level).
Ensure the digital inclinometer is securely mounted to the boom.
1. Fully retract the boom.
2. Using an inclinometer, set the boom to 0° (zero) and ensure the displayed boom angle value is
0.0°. If the angle value is not 0.0°, refer to CALIBRATING THE ANGLE SENSOR ZERO.
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 CALIBRATING SPAN OF EXTENSION AND ANGLE.
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