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66
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FRAME MAINTENANCE
REPAIR OF MAIN FRAME
Inspect frame for cracks periodically. Crushing or shearing is an abusive operation and
eventually frame cracking may occur. If the attachment has been overstressed due to
improper operation or has been used for many hours of operation, the steel components
may develop fatigue cracks. If cracking is found in any of the steel components of the
processor, photos of the crack or cracks must be emailed to NPK immediately so that
the crack can be evaluated and a repair option recommended.
ROUTINE WELD REPAIR
1. Gouge any cracks 100% using an air
or electric hand held grinder (t1),
carbon arc (t12) or torch (t13).
2a. Grind gouged area to a 30° angle on
each side to the full depth of the
gouged area for plate sizes up to 3/4"
(19 mm)
thick.
2b. Grind gouged area to a 45° angle on
each side to the full depth of the
gouged area for plate sizes over 3/4"
(19 mm)
thick.
3. If the crack is completely through the plate, grind the bevel in halfway from both
sides. Remove all slag and grinding residue.
4. Consult the
“JAW and TOOTH REBUILD PROCEDURE”
,
“HARD FACE”
section
for pre-heat and welding instructions.
5. Peen or stress relieve after each pass. Maintain pre-heat.
6. After welding, grind area flush.
22
DIRECTION OF GRINDING
23
DIRECTION OF PRINCIPLE STRESS
Содержание M35G
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