55M4300CCE00 Rev A
Warning Note :
This procedure will not normally be necessary and should not be
used unless under the guidance of RW technical staff. It must not be used before
exhausting other, more likely, causes of load reading errors such as dimensional errors
or proper no load calibration using an adequate number of calibration points.
6
ANNEX 1 – Calibration of Main boom “Load correction”
A separate calibration is available for each crane configuration that also has an
individual no load calibration, but is not used for configurations with boom attachments
(refer to Section 3.10 and 3.11).
It is used to add an allowance into the calculation of the hook load to compensate for a
potential build up of minor errors in either fixed data or previous calibration data.
It is recommended that this procedure is done with the machine on outriggers or
crawlers.
Some inaccuracy of load indication with very small loads at high boom angles and short
boom lengths is likely due to the small boom lift cylinder pressures encountered in this
zone. Do not use the weight of the hook block alone to judge load indication
performance, these calibrations should be done with loads in excess of 50% SWL.
If a load correction calibration is found to be necessary the minimum number of
correction factor points that must be calibrated is 2, the maximum that can be
calibrated is 20. The lowest boom angle used for load correction calibration must be 0
degrees or higher (ie it cannot be negative).
Summary of Contents for i4300
Page 2: ...55M4300CCE00 Rev A ...
