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Canvas will not move with grouper down
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Drive or idler roll wrapped with material
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Loosen canvas and clean rolls
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Idler roll tension adjustment incorrect
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Readjust idler roll tension
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Resetting spring of shut-off valve blocked, disengaged or broken
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Clean, check, change broken part
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Drive belt broken
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Replace broken belt
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Canvas still running while grouper is fully raised up
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Shut-off valve not actuated
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Check chain for breakage and/or chain attaching hardware
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