Highway Equipment Company NEW LEADER G4 How To Check - Page 6

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ADJUSTING THE SPREAD PATTERN CONTINUED

SPINNERS

WARNING

Spinner discs and fins must be kept clean and polished. Even a small build-up

NOTICE!

on a spinner fin can significantly affect the spread pattern. Rusty, rough, bent

or worn fins will produce poor spread patterns.

Fan speed is adjustable from approximately 350 to 680 RPM. This is accomplished by changing the

settings in the controller.

Proper fan speed adjustment is very important in obtaining good spread patterns. The best fan speed to

use will depend entirely on the material being spread, and must be determined by testing.

Pattern width will vary anywhere from 25 to 55 feet.

For every material there is a critical fan 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 fan speed could result in a heavy deposit behind the truck 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 550 and 575

RPM for ordinary materials.

One way to adjust fan speed is to watch the material leaving the fans. At slow speed the material leaves

the blades 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 fan speed is slightly higher than that

when the bands close to a blur.

Use great caution while working around the spreader. Contact with

spinners and other moving parts is very dangerous. Do not adjust

while machinery is moving, wear eye protection and avoid discharge

from spinners. Do not ride on moving spreader.

HIGHWAY EQUIPMENT COMPANY

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