Elliott Digger Derrick, Operation & Maintenance Manual, Page: 286 / 376

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W450321A 09/12
5. Check the extension value in the display window for the correct retracted boom length. The
retracted boom length should match the retracted boom length from the load chart. The value
must be within ± 0.2ft. 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 ±0.5 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 center of the
load hook 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 0.5 ft. If it does not match, refer to CALIBRATING THE ANGLE
SENSOR ZERO .