Page 2 Section 6
Scheduled Maintenance
MSD 7R SHEARS
UPPER SHEAR BUILD UP AND
HARDSURFACING
All upper piercing tip and lower piercing area main-
tenance from Section 4 must be performed before
any upper shear build-up and hardsurfacing is done.
It is recommended that the upper shear mainte-
nance be done at the end of the working day to al-
low adequate cooling time before putting the shear
back into production.
1.
For maximum shearing efficiency, the upper
shear should be checked for wear. All edges should
be kept square with the blades and piercing tip. To
determine how much build-up is required on the
front of the upper shear, place a straight edge along
cutting blades and the newly maintained or replaced
piercing tip. There will be a gap indicating how much
build-up is required (see figure 6-1).
2.
Clean all dirt and grease from area to be built-up.
3.
Remove all existing hardsurfacing by grinding
down to the base metal before beginning build-up
and hardsurfacing procedures.
4.
Preheat the area to be built-up and the surround-
ing area to 300-400°F (150-200°C). Test area fre-
quently using a melt stick, as overheating can harm
the shear (maximum 450°F / 230° C). Temperature/
melt sticks are available from LaBounty.
5.
For build-up, apply AWS E7018 welding rod. Peen
each pass vigorously to relieve weld stress and
remove slag. Grind all edges to 90º.
6.
To hardsurface the front of the upper shear, begin
on the piercing tip to approximately half way up
the front, apply single passes of Amalloy 814 rod
or equivalent in a diamond pattern of approximately
one inch (38mm) (see figure 6-2). Peen each pass.
NOTICE
Check temperature during this procedure. Maintain
300-400°F (150-200°C).
BUILD UP TEMPLATE
STRAIGHT EDGE
FIGURE 6-1
FIGURE 6-2
