GREAT PLAINS HT1100-40, Operator'S Manual, Page: 21 / 38

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OPERATION MANUAL
Set Up / Operation
CLOSURE SLIDES
Figure 10. Closure Slides
1. Top Position 4. Closed Position
2. Mid Position 5. Metering Wheels
3. Low Position
The closure slides are located behind each metering wheel. They should be in the low position
for small seed, mid position for granular chemicals, and in the top position for large seeds
(refer to rate chart). Do not use the closure slides to regulate product flow. The closure slides
can be pushed down to the closed position when removing the metering wheels if product is
still in the hopper.
CALIBRATION
Calibration determines the actual product flow rate of your applicator. Generally, the metering
rate of granular products and seed is predictable as long as its properties are consistent.
However, metering rate variations are possible and may be caused by:
• Manufacturer’s quality control
• A change in product density due to settling during transport
• Damaged or worn metering components
• Variations in seed size and density due to changes in growing conditions
• Atmospheric conditions
For these reasons, product rate charts are only a guide. Calibration is essential for accurate
application. The applicator should be calibrated the first time a new granular product is used
and periodically thereafter. For seed, the applicator should be calibrated each time a particular
lot of seed is used.