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About the Attachment
MSD 7R SHEARS
ATTACHMENT GLOSSARY
Adjustment
Custom-made plates that precisely adjust the lower cutting blades to the upper blades. These plates make
Plates
it possible to achieve a uniform blade gap on the shear.
Apex
The point where the primary and secondary cutting blades come together.
Blade Gap
The gap between the upper and lower cutting blades as the blades bypass. A very important item that
must be maintained regularly to prevent material from jamming in the blades.
Blade Shims
Thin metal shims used to adjust the position of the lower cutting blades to maintain a proper blade gap.
Blades should never be shimmed out farther than 0.13" (3.3 mm).
Build Up
Welding process where worn off parent material is replaced with new metal. A very important maintenance
procedure that must be performed regularly throughout the life of the shear.
Control Valve
Used in the hydraulic rotation kit to direct fl ow to the accumulator and back to the hydraulic motor.
Manifold
Cross Pattern
A method of torquing a circular pattern of bolts down to achieve proper seating. The technique pattern,
Technique
based on a clock face pattern, would follow the order of 12, 6, 11, 5, 10, 4, 9, 3, 8, 2, 7, 1.
Crossover
A hydraulic component used in a rotating shear that limits the amount of hydraulic pressure sent to the
Relief Valve
rotation assembly. The crossover is preset at the factory and must not be tampered with.
Flow Control
A hydraulic component used in a rotating shear that meters out the hydraulic fl uid from the rotation motor.
Valve
The
fl ow control should be set to limit the rotator from spinning faster than 1 - 2 revolutions per minute.
Front Cylinder
The pin that attaches the shear cylinder barrel end to the upper shear.
Pin
Front Wear
The area of the upper that contacts the guide blade; it is located on the opposite side of the upper shear
Plate
from the cutting blades.
Grain of
The direction that the parent material was initially rolled at the steel mill. It is very important when
Material
hardsurfacing any part of the shear to weld with the grain of the steel. Cross-grained hardsurfacing has the
tendency to start cracks in the base material.
Guide Blade
A replaceable component located opposite the cutting blades in the lower shear. The main purpose of the
guide blade is to support the upper shear during the cutting cycle.
Guide Blade
Thin metal shims used to adjust the guide blade out to maintain the proper guide blade gap. Shims come in
Shim Set
a designated set that determines when the guide blade will be indexed or replaced.
Guide Blade
The gap between the front wear plate and the guide blade as the upper shear is cycled into the lower. This
Gap
is an important maintenance item to ensure longevity of the shear’s structure.
Hardsurface
Welding process for protecting the parent material of the shear jaws. The hardsurface acts as a wear
surface.
