Section 6 – CALIBRATING YOUR SPREADER
Note: The rate chart on the spreader hopper will provide a general starting point for most application jobs.
To fine-tune the rate per acre perform the following steps:
Setting the pounds per acre
The following steps are performed with the spreader EMPTY:
1. Set the tractor in the gear to be used in the field. While driving 72 feet, count the teeth on the Body Chain
Drive Sprocket (#26 on the parts drawing # 402. This is the 6-tooth cast sprocket that pulls the chain through
the hopper.) Typically 20 or 30 teeth will pass while driving 72 feet.
2. Remove the shear bold from the Sower Drive Sprocket (#5 on the parts drawing # 403). This will prevent
the sower chains from running.
3. Remove the front end plates from both body channels. This will allow material to flow out for weighing.
The following steps are performed with material in the hopper:
4. With the sower (boom) chains stationary (from Step #2 above), run the body chains until the center sower
trough is full and material is spilling out the ends of the body chain troughs (from Step #3 above). Close the
slides on the bottom side.
5. Place plastic sheeting or buckets under each end of the body chain channels to collect material for
weighing.
6. With the spreader stationary run the body chain until the Body Chain Drive Sprockets move the same
number of teeth counted in Step #1 above.
7. With the material collected from both sides. Multiply the combined weight by
20.2
to calculate the rate
per acre.
Setting the Spread Pattern
These steps assure the level spreading of material from all openings on the sowers.
8. Extend sowers full width and lay plastic sheeting under the sower arms to collect material and to observe
the distribution pattern.
9. Replace the shear bolt in the Sower Drive Sprocket (removed in Step #2 above) to operate the sower
chains.
10. Adjust the four Sower Slides on the bottom of each section until:
a. Material falls out uniformly along full width of sower arms, and
b. Some material returns with the chain on the return track.
All slides must be adjusted to the same hole opening for uniform application.
- End of Calibration -
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