New Holland CX720 Repair Manual page 1454

DISTRIBUTION SYSTEMS - ELECTRONIC SYSTEM
Farming system Sensing system - Dynamic description
(A.50.A.96.95 - C.30.A.10)
The moisture sensor measures grain that is falling out of the clean grain elevator into a small bin of the bypass unit.
The moisture content of the grain in this bin is sensed by the moisture sensor at the back of the bypass unit. The level
of grain in the bin is controlled by a proximity switch, which is located at the top of the bin and an auger at the bottom
of the bin. In order to have a good moisture reading the moisture sensor fin must always be clean and covered totally
by grain.
In other words the bin has to contain always a minimum amount of grain. The sensitivity of the proximity switch can
be adjusted. If the level sensor is set too sensitive then the auger will start turning too early and not enough grain will
be available in the sensor chamber to have a good moisture reading. As a result you will see the moisture value on
the InfoView™ fluctuating a lot and suddenly drop to a low level.
If the level sensor is set not sensitive enough the bin will always contain the same grain resulting in a practical constant
moisture reading all over the field.
NOTE: It should be remarked that although the level sensor sensitivity is set correct it is possible that due to material
blockage (pieces of maize cobs) in front of the level sensor will also cause the auger to turn continuously when the
threshing is on. This situation can be recognized when the moisture readings are abnormally low or largely fluctuating.
Therefore before changing the sensitivity of the level sensor remove the moisture sensor. Then you can look into the
bin. In the top of the bin a white circle (=level sensor head surface) must be visible without being covered by dirt or
crop residues. If you found material accumulated in front of the level sensor, remove it.
If the moisture reading is still fluctuating or the electrical motor keeps on turning all the time then it is advised to change
the sensitivity of the level sensor.
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