Ashland I-80 - Manual (Page 19)

COUNTERBALANCE VALVE
PURPOSE of the counterbalance valve is to prevent the front gate from closing before the
rear pushgate is fully retracted when the scraper is empty. This enables the operator to
start the next cut without having to reopen the gate from the closed position.
INSTRUCTIONS for establishing counterbalance valve setting:
When properly adjusted, the front gate will close 40% from full open position and hold at
that position until the rear pushgate is fully retracted. If the front gate is closing more than
40%, remove the acorn cap nut and turn the adjusting screw clockwise until the front gate
holds at that position. Turn an additional ¼ turn clockwise, then tighten the lock nut. DO
NOT turn the adjusting screw more than is necessary to hold the front gate at 40% open.
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