PUMP GP- 6I1227 - Caterpillar

Boom Position Sensor Calibration - Model 390F
The following procedure is required to measure the dimensions of the boom linkage and provide the input for Cat Grade Control calibration.
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Model 390F Boom calibration requires a unique procedure, involving the use of a laser measuring system and laser target, including a measured pole. To begin, move the machine to a level surface.
Place the "Total Station" (laser measuring device) in a location where each measuring point is unobstructed.
Review the "Total Station" instructions when leveling the laser emitter.
Set the rod (see illustration 16) on the machine.
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Pass the rod through the sheet metal hole as seen in illustration 17.
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Put the rod on the center of the plate above the Boom pin (see illustrations 18 and 19.
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Keep the rod in a vertical position as the measurement is being made (refer to illustrations 20 and 21).
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The length to complete the stick calibration can now be calculated. The calculation must be competed for the A to G length or the A to F length. The formula for calculating the length is: A'-G = SQRT (HD^2 + ((R+r)^2). Required length = SQRT (A'-G^2 - Offset^2).The required constant values are:
R: Rod Length
r: Boom frame Plate Height
Offset: A-A` distance (390F: 86.5 mm)
"r" and "Offset" are provided by the drawings.
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Stick Sensor Calibrating Screen
During this step, the ECM is using the entered value along with the linkage dimensions to calibrate a calibration offset value. This step will proceed automatically once completed by the ECM.
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Stick Sensor Completion Screen
Calibration is complete. Press the "Back" button to return to the calibration menu.This calibration can be performed up to four times after the "Front Linkage" calibration has been completed by selecting a different calibration location in the list. The different locations will allow the calibration to be normalized throughout the range of motion. Each time the calibration is performed, the linkage should be in a different position with pin "G" at various distances away from the pin. "A". Ideally the stick sensor should be calibrated at the two extremes and three points located equally between the minimum and maximum distances.Note: After all the calibrations have been performed, review all the resulting calibration angles. All the calibration angles are typically similar. Tight calibration values can indicate a well adjusted and calibrated system, but the angle values may spread a range larger than 0.4 degrees while maintaining system accuracy. The calibration angle value determined from the "Front Linkage Position Sensor" calibration may be deleted if the reading differs significantly from the other values in the table.Bucket Position Sensor Cylinder Calibration
Before performing the bucket sensor calibration, confirm that the default minimum and maximum lengths match the actual minimum and maximum lengths of the bucket cylinder. Measure the bucket cylinder at full extension. Measure the bucket cylinder at full retraction. Compare these measurements to the values shown in the "Bkt Cyl Max Ext Length" and "Bkt Cyl Min Ret Length" on the "CGC Setting" screen. Navigate to the CGC Setting