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3.7.5 Checking the Angle Sensor Pendulum
The Angle Sensor uses a copper pendulum, mounted behind the sensor assembly. In order to control
the pendulum during movements of the boom, two magnets provide damping. If problems with the
angle sensor are suspected, ensure the pendulum and potentiometer are operating without restriction.
Then continue to check electrical operation before performing any calibration.
1. Remove the Reeling Drum cover.
2. Locate the pendulum. Refer to Figure 3.8.5 below.
3. Push the pendulum downwards and ensure it isn’t sticking. Some resistance of movement may
be encountered as the pendulum is moved; however, this is due to the magnets that provide the
damping.
4. Release the pendulum and ensure it returns with free, but controlled movement, directly back to
its original position. Repeat this step a few more times, ensuring it always returns to its original
position.
NOTE: If the pendulum “sticks” while performing the above checks, ensure there are no wires touching
the pendulum, or that no other obvious problems are present. If not, it will be necessary to replace the
sensor assembly.
FIGURE 3.7.5 - SENSOR BASEPLATE ASSEMBLY
