5
HIGHWAY EQUIPMENT COMPANY
G
4
305438-SP-A
Page Rev. A
ADJUSTING THE SPREAD PATTERN
NOTICE!
Spinner assembly has NOT been adjusted at the factory. Before spreading
material, spread pattern tests must be conducted to properly adjust the spread
pattern. A Spread Pattern Test Kit, part number 300508, is available for this
purpose. THE MANUFACTURER OF THIS SPREADER WILL NOT BE
LIABLE FOR MISAPPLIED MATERIAL DUE TO AN IMPROPERLY
ADJUSTED SPREADER!
It is recommended that spread pattern tests be conducted prior to each spreading season, after any
spreader maintenance, and periodically during the spreading season. Spread pattern tests must be
performed for each product and application rate.
Spread pattern is affected by many factors. Among the more significant of these are:
1.
Spinner speed.
2.
Material weight per cubic foot.
3.
Material flow characteristics.
4.
Rate of delivery of material.
5.
Point of delivery of material on spinner discs.
6.
Balance between deliveries to both spinner discs.
7.
Angle of the distributor fins on the spinner discs.
8.
Cleanliness of the spinner fins and discs.
9.
Level of spreader.
10. Wind and humidity.
11. Spacing of swaths.
12. Wear on spinner fins.
Since many of these factors will vary for each job, trial and experience must be used to determine the
adjustments which must be made to obtain the spread width and spread pattern desired. The following
instructions are given to cover the adjustments available and the effect that each will have on the spread
pattern.
