AFS
29
Grain Moisture and Weight Calibration
The most common calibration necessary is crop calibration—
moisture and weight. Prior to harvesting, some mechanical
checks should be performed. The flow sensor impact plate
should be inspected. If any holes are worn through the plate it
should be replaced.
The distance between the clean grain elevator deflector plate
in the elevator head and elevator paddles is critical to assure
all grain contacts the flow sensor impact plate.
• The elevator head shaft is adjusted vertically to achieve a
3/8" to 1/2" paddle tip to deflector plate clearance
(see
figure 29.1)
After this adjustment is set, all elevator chain tension
adjustments must be made at the lower elevator shaft.
• Record the sensor calibration number from the decal on the
top of the elevator. This number is entered in the touch
screen display during combine “Vehicle Setup”
(see figure
29.2)
.
The grain moisture sensor operates on the principle of an
electrical current flowing from the sensor fin, through the
grain, and to the ground
(see figure 29.3).
• The grain moisture sensor fin and temperature sensor must
be clean for proper function. A buildup of crop sap can
reduce sensor accuracy.
• Remove any crop residue by scraping or using soap
and water or solvent to clean the moisture fin and
temperature sensors
The bypass auger is controlled by a proximity switch that
cycles the auger as required, to assure the sensor fin is always
in contact with grain.
• The bypass auger should be removed and cleaned. Ensure
that the auger has not seized to the plastic block that
supports the non-drive end
(see figure 29.4).
Operators should monitor Instantaneous Moisture values while
harvesting to confirm the sensor is functioning. If moisture
values do not show some fluctuation, a problem may exist with
the moisture sensor that requires attention to assure accurate
harvest data.
Figure 29.1
Figure 29.3
Figure 29.4
Figure 29.2
3/8" to 1/2"
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