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9. Knife Recommendations and Adjustments
NOTE: The rotor and bed knives should be inspected periodically for sharpness. The sharper the knives are kept, the more
efficiently and effectively the machine will operate. Waiting until the knives have been severely rounded, chipped, or
otherwise damaged will result in heavy shock loading during operation causing a subsequent reduction in knife life. (For re-
sharpening diagrams refer to section 11).
KNIFE REMOVAL AND ADJUSTMENT PROCEDURE
1. Shut OFF all power including the main disconnect switch using proper LOTO practices.
DANGER: Before undertaking any machine repairs or maintenance, always make certain that the machine disconnect
switch is turned to the OFF position or that the control enclosure is disconnected from the main power source. Lockout
all sources of power including the main disconnect switch and follow all of your plant lockout procedures.
2. Follow instructions in section 14 on opening the machine and screen chamber.
3. See sketch in section 10, for the general cutting chamber drawing.
4. Remove the screen and stand it on edge to avoid damage.
ROTOR KNIFE REMOVAL
1. Carefully block the rotor with a piece of wood to prevent it from turning.
2. Loosen the hex head rotor knife bolts and carefully remove all rotor knives.
3. Clean the rotor knife seats thoroughly with a scraper and/or cloth paper to remove any foreign material or rust.
4. Inspect the knives and replace or re-sharpen as required.
BED KNIFE REMOVAL
1. Loosen the head socket cap screws holding the bed knives and clamping bars, working from the knife edges inward to the
center. Note the relative position of each part before they are removed. As the last screw is backed out, the clamping bar
and knife will require support to prevent them from falling.
2. Clean the bed knife seats thoroughly with a scraper and/or cloth paper to remove any foreign material and rust.
3. Inspect the components and replace or re-sharpen as required.
CAUTION: All knives should be handled with extreme care. It is suggested that all sharp cutting edges be covered with
tape to prevent injury to personnel or damage to the knives during installation. Be sure to remove tape before gapping
knives.
BED KNIFE INSTALLATION
1. Install the new or re-sharpened bed knives and clamps in the reverse of removal.
2. Make sure the knives are fully back against the knife adjusting screws and loosen the adjusting screw checknuts
slightly.
3. Do not torque the socket cap screws fully at this point. Snug them down only.
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