MSD 7R SHEARS
Page 14
Section 5
Maintenance
GUIDE BLADE SHIMMING AND ROTATION
The guide blade helps keep the shear blades in line and must be checked daily. See fi gure 5-3.
1.
With the shear partially closed so the upper wear area is in contact with the guide blade, check the gap
between the wear area on the upper and the guide blade. Cycle the upper and check in several spots. Shim to
the smallest gap.The gap must not exceed 0.030" (0.76 mm).
2.
Shims have been provided for shimming out the guide blade. Four (4) are 0.023” (0.53 mm) thick; one (1) is
0.12" (3 mm) thick.
3.
When fi ve (5) shims have been placed between the guide blade and seat, the guide blade can then be
turned end for end and re-shimmed for proper gap. Once all fi ve shims have been used again the guide blade
is worn out and must be replaced.
4.
If a gap still exists between a new guide blade with a full amount of shims and the upper wear area, the
wear area must be built up. Refer to Upper Shear Wear Surface Build-up on page 5-21.
FIGURE 5-3
Wear gloves at all times during
blade maintenance.
LOWER SHEAR
UPPER SHEAR
WEAR SURFACE
GUIDE BLADE
0.030" (0.76MM) OR LESS
