Spinners

NOTE:

N98673-UN-23MAY12

A - Worn Fins

Spinner discs and fins must be kept clean and polished. Even a small buildup on a spinner fin can significantly affect the spread pattern.

Rusty, rough, bent or worn fins (A) will produce poor spread patterns.

Spinner speed is adjustable from approximately 400 to 900 rpm. This is accomplished by changing the settings in Spreadstar™. (See Spreader Product Setup in Spreadstar™ section in this manual.) Proper spinner speed adjustment is very important in obtaining good spread patterns. The best spinner speed to use will depend entirely on the material being spread, and must be determined by testing.

A major factor of maximum pattern width is particle size. This may vary anywhere from 7.6 m (25 ft.) for finely powdered material up to 37 m (120 ft.) or more for extremely large fertilizer pellets.

For every material there is a critical spinner speed. In other words, there is a speed which will result in the maximum width obtainable. Going beyond this speed will not increase spread width, but will result in poor patterns.

Too high a spinner speed could result in a heavy deposit behind the spreader due to break-down of material. This upper speed limit will be quite low for finely powdered material, and can be quite high for extremely coarse materials. In general, this critical speed will fall somewhere between 600 and 800 rpm for ordinary materials. One way to adjust spinner speed is to watch the material leaving the spinners. At slow speed the material leaves the fins in narrow bands. At medium speed it forms wide bands in the air. At somewhat higher speed, the bands close into a uniform blur. Normally, the proper spinner speed is slightly higher than that when the bands close to a blur. It is recommended that a spread pattern test be performed for each product and application rate you handle. Once initial testing is completed, testing should be repeated at the beginning of every season, or any time maintenance is performed on any component affecting spread patterns.