2D system measurements 9
l boom centerline is to the left of the COR
l boom pin centerline is behind the COR
Finding the center of rotation
Before you can take the measurements, you must locate the COR.
The COR is not always easy to find. Typically, the COR has a circular cap and
hydraulic hoses feeding into it, and there is a circular ‘tower’ close by:
1
Tower
2
Center of rotation (COR)
Measuring the boom pin lateral offset
1. Mark the centerline of the boom near the boom pin.
2. Use a square and a tape measure to find the perpendicular distance from the
GCS900 Grade Control System for Excavators Installation Manual 103
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