LINES GP-COUPLER 4155118 - Caterpillar

Illustration 4 g03866332
Crack image
Illustration 5 g03866333
Crack section
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Gouging image
Illustration 7 g03866339
Crack image
Illustration 8 g03866347
Crack section
Illustration 9 g03866362
Gouging image
Use an air carbon arc torch in order to gouge out the crack completely.
Illustration 10 g03866366
Use a grinder in order to check the crack. Adjust the plate surface angle to 25 degrees in order to make it easier to weld.
Use the dye penetrant to inspect the gouged area in order to ensure that the crack has been removed. Be sure to clean the prepared groove before welding.
Illustration 11 g03866369
Weld passes
Illustration 12 g03866378
Illustration 13 g03866381
Weld the gouged groove with enough penetration. Tie in to each plate with the proper weld penetration. Refer to Illustration 11 for the weld passes.
The weld shall be free from cracks, porosity, undercut, and incomplete fusion. All weld quality shall conform to ANSI/AWS D1.1 or D14.3.
The reinforcement procedure is provided for both the machines with failures and machines with no failures. If the reinforcement is not needed, refer to Step 14.
Illustration 14 g03866384
If the eye plate is attached, remove the lifting hooks to avoid interference.
Illustration 15 g03866388
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Locations of the reinforcement plate
Illustration 17 g03866392
Weld indication
Fabricate the reinforcement plate. Refer to Illustration 15. The plate size applies for DB family linkage ( 254-3025 Link and Bearing As , 241-7140 Link and Bearing As ).Note: Plate requirement: STRUCTURAL (290MPa Min yield) Ex: GB 1591 (Grade Q295, Q345, Q390, Q420, Q460) in china material spec.
Remove any oil, paint, or dirt from the edge of the reinforcement plate.
Finish weld the repair and weld the reinforcement plate to the linkage.
After all of the finished welds are completed, grind the welds smooth and apply needle peening. Use ultrasonic test if possible.
Use Caterpillar authorized paint for the welds.