MSD 7R SHEARS
Page 20 Section 5 Maintenance
BUILD-UP AND
HARDSURFACING
In order to perform maintenance on the lower pierc-
ing area, all blade maintenance and piercing tip main-
tenance must be completed. LaBounty shears have
hardsurfacing on the lower portion and the nose
plate, across the front and along the top, and back
along the lower to the cutting blade and guide blade.
Normal intervals for hardsurfacing vary with applica-
tion. Use of the shear in a scrap application generally
requires a 160 - 200 hour interval for hardsurfacing.
Use of the shear in a demolition application of brick
and concrete may be subject to a shorter interval
of 80 - 120 hours. The initial hardsurfacing should be
performed after approximately 40 hours of normal
use. It is absolutely necessary that the lower portion
of the shear be maintained routinely by the following
process.
1. Place the shear in a horizontal position and block it
up about 18" high, or preferred working height. Use
a straight edge on the inside of the shear blades and
on the guide blade (see fi gure 5-10) or a the lower
profi le template supplied by LaBounty (see fi gure
5-11) to determine how much build-up and hard sur-
facing is required .
2. Clean all dirt and grease from area to be built-up.
3. Remove any existing hardsurface material down to
base metal by grinding.
4. Preheat the area to be built-up and the surround-
ing area to 300 - 400°F (150 - 200°C) (use melt stick).
Test area frequently, as overheating can harm the
shear (maximum 450°F / 230°C). Temperature/melt
sticks are available from LaBounty.
5. For AWS E7018 build-up, start inside the lower in
front of the shear blade (see fi rst fi gure 5-10), make
single passes side by side until area is covered.
Repeat the process on the guide blade side (see sec-
ond fi gure 5-10) and inside the nose plate. Peen each
pass.
START BUILD-UP
HERE
FINISH BUILD-UP
HERE
FIGURE 5-10
FIGURE 5-11
BUILD-UP
TEMPLATE
