Page 12
Section 5
Maintenance
MOBILE DEMOLITION PROCESSORS
GENERAL GUIDELINES FOR
BUILD UP AND WEAR PLATE
REPLACEMENT
Proper build up and wear plate replacement is done
according to the inspection scheduled for each jaw
type. If the jaws are in a severe application, the
interval for maintenance may need to be shortened.
Allow the wear plates to wear down, but not com-
pletely away, before installing new wear plates. The
quality and attention to detail in welding can signifi-
cantly affect the life of the jaws. LaBounty strongly
recommends that only certified welders perform
this procedure.
BUILD UP RECOMMENDATIONS
The build up material acts to replace any parent
material that has worn away. See the list of AWS
classifications below to select a suitable build-up
material for your proceesors. Weld products within
these classifications meet the combined require-
ments for strength, toughness, and ductility that are
essential for LaBounty applications.
Shielded Metal Arc Welding - Stick Electrodes
• E7018
• E8018-C 3
Gas Metal Arc Welding - Solid Wire Electrodes
• ER 70S-6
Gas Metal Arc Welding - Flux Cored Electrodes
• E71 T- 1
• E71T-1M
• E80T1-Ni1
• E80T1-Ni1M
Gas Metal Arc Welding - Metal Powder Cored Elec-
trodes
• E70C-6M
• E80C-Ni1
BUILD UP PROCEDURE
PREHEAT
Preheat the general surrounding area to at least
200°F (100°C) to remove moisture from the base
material.
Before ANY thermal process is applied
to the processor steel, including welding, tack
welding, torch cutting, and air-arcing, preheat
the area within 6
"
(150 mm) of the local area to
a minimum of 400°F (200°C) and a maximum of
450°F (230°C). This includes adding and remov-
ing lifting lugs.
Preheat must be uniform through-
out the material thickness and maintained until all
welding has been completed. Avoid cyclic heating
and large temperature swings. Preheating may
be done by localized gas torches, or thermal strip
blankets.
POST HEAT
If preheat has dropped below 400°F (200°C) within
6" (150 mm) of the weld area, post heat to 400°
(200°C) and wrap with heat blanket to allow it to
cool slowly to the ambient temperature. Plan to
perform build up and hardsurfacing at the end of
the day or when there will be adequate time for the
welded areas to cool before placing the proceesor
back into service.
HANDLING AND STORAGE OF WELD
MATERIALS
Follow the weld manufacturer’s handling and stor-
age instructions closely. Make sure the electrodes
and/or wire are free of moisture. Moisture can
cause cracks and porosity in the weld and in the
base metal beneath the weld.
WELD QUALITY
Quality and attention to detail in welding signifi-
cantly affects the life of the MDP. Stanley LaBounty
strongly recommends that only qualified and certi-
fied welders perform this work. Be sure the weld
consumables and base material are clean and dry.
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