HARRISTON INDUSTRIES 4240 CLOD HOPPER, Operator'S Manual, Page: 38 / 84

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7.
Roll Scrapers:
Each roller is designed with scrapers that al-
low operating personnel to clean the roller if it
develops a build-up of debris. Front rolls for the
small potatoes are designed with hydraulically
positioned scrapers and the rear rolls are set
manually and spring-loaded.
a. Front Rolls (Small Potatoes):
• Use the hand hydraulic jack to position
the scraper on each roll.
• Close the relief valve on the jack base.
• Turn the selector valve handle to the right
or left to direct the flow to the upper (pri-
mary) or lower (secondary) roll scraper
position cylinders.
• Use the jack to position the scraper to
keep the roll free of debris.
b.
Rear Rolls (Large Potatoes):
• Use the position bolts on the scraper
mounts to set the scraper position.
• The compression spring will keep the
scraper-to-roll pressure constant.
FIG. 9 FRONT ROLL SCRAPERS
a. Relief Valve b. Selector Valve
Left Side Cylinders
Right Side Cylinders
FIG. 10 REAR ROLLS (TYPICAL)
a
b