NPK M20C, Instruction Manual, Page: 69 / 152

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69
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GENERAL MAINTENANCE
K JAW BLADE MAINTENANCE AND ADJUSTMENT
Each primary blade (BG) will have a spacer plate (DE) placed between the blade and
blade pocket. Install the blades, spacers, and socket head cap screws (OO) into the
male jaw and tighten.
STEP 2:
Using a steel straight edge (t15) place the edge across the face of the primary blades
(BG).
There should be no gap (d95) between either of the primary blades and the straight
edge. If the primary blades are being turned and a gap (d3) is found between either of
the primary blades and the straight edge, measure the gap using feeler gauges, then,
remove the measured amount from the high blade by grinding ( blade may require
surface grinding at a machine shop ). If the difference between the primary blades is
excessive, install new primary blades.
DO NOT ADD SHIMS BEHIND THE PRIMARY
BLADES!