55M4500CCE00 REV A
Step #17: Optional “Load adjustment”
This procedure is optional: one load adjustment factor is available per attachment
configuration and is used to increase the accuracy of the load on hook indication. This
will compensate for minor geometric errors that may come from crane manufacturing
tolerances or from the method used to take the dimensions, weights and centre of
gravity locations of attachments.
The hook weight should not be used alone to judge the load reading performance. This
should be checked using at least 3 different weights, the hook block, 25% SWL, and a
load greater than 50% SWL. The results of these checks should be used to determine
whether “load adjustment” or “load offset” should be used to improve performance.
“Load adjustment” should only be used if the load reading indicates a constant
percentage of error for the complete operation range. If the percentage of error is
variable then verify all data entries required in the dimension and calibration data
section.
It is recommended that this procedure is done with the machine on outriggers or
crawlers.
A known test load is needed to perform this calibration and should be between 50% and
90% of SWL for the configuration to be calibrated. This SWL should be based on the
capacity with a boom angle of approximately 60° and with a fully retracted boom.
The calculated test load should normally include the weight of the hook block and any
slings, shackles etc. that are used.
Ensure the current duty selection matches the actual crane configuration to be
calibrated.
1)
Use
“
”
or
“
”
to highlight “Load adjustment” and press
“
”
to enter.
The display will change to show:
Where
Load:
represents the suspended load reading and
1.00
represents the
adjustment factor (a value of 1.00 signifies that there is no applied adjustment). The
main boom must be completely retracted with an angle of approximately 60°. When
positioning the machine remember to make the last derrick motion boom up. Carefully
lift the test load just clear of the ground.
Summary of Contents for i4500
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