BRACKET A.-LH 6H7464 - Caterpillar

Illustration 4 g03854146
(C) Tube (D) Support
Thoroughly inspect the entire area shown in Illustration 4 for cracks and defects. Dye penetrant or other testing methods should be used to verify the extent of the damage.
Using a suitable tool, grind all surfaces to be welded.
Illustration 5 g03855564
Section view of support (D) .
Excavate the required areas by air-arc gouging or grinding. If cracks do not penetrate the casting as shown in Illustration 5, repair is only necessary from one side.Note: Exercise caution to avoid gouging through the full thickness wall. Casting in the wall of support (D) is approximately 12 mm (0.5 inch) thick.
Verify that the entire defect has been removed. Use dye penetrant to inspect the joint. If the crack extends through the thickness of the casting, repair will be required on both sides as shown in Step 14 through Step 21.
Thoroughly clean the area in order to remove debris.
Repeat process for the left side of the machine.
Illustration 6 g03855566
Section view of support (D) .
Weld casting (D) with stringer passes that do not exceed the volume of an 8 mm (0.31 inch) fillet weld.
Slag after each pass. The number of passes will be dependent on the amount of materiel removed.
Grind all welds smooth with the support.
Primer the area with 4C-4205 Primer Paint followed with 4C-4200 Paint as needed.
Repeat process for the left side of the machine.
Illustration 7 g03854479
Exterior, bottom view of tube (C) and both supports (D) .
Illustration 8 g03855567
Section view of support (D) .
Back gouge the underside to solid metal working surface.
Thoroughly clean carbon and slag from groove.
Verify that the entire defect has been removed using dye penetrant to inspect the joint.
Illustration 9 g03855568
Section view of support (D) .
Weld the bottom groove full with stringer passes that do not exceed the volume of an 8 mm (0.31 inch) fillet weld.
Slag after each pass that is made. The number of passes will be dependent on the amount of materiel removed.
Grind all welds smooth with the support.
Primer the area with 4C-4205 Primer Paint followed with 4C-4200 Paint as needed.
Repeat process for the left side of the machine if needed.
Illustration 10 g03854580
(1) Backing Plate (A) Plate (H) 15 mm (0.59 inch) (J) 10 mm (0.39 inch)
Using A36 steel or equivalent 6 mm (0.24 inch) thick, make two backing plates (1) .
Create backing plates (1) 10 mm (0.4 inch) larger than the opening with a 15 mm (0.6 inch) lip on the inside. Refer to Illustration 10 for details.
Insert the backing plate into the hole.Note: Backing plate (1) may require being cut in half in order to fit through the hole in plate (A) .
Tack weld backing plate (1) into place.
Repeat process for the left side of the machine.
Illustration 11 g03854916
(1) Backing Plate (2) Window Plate (K) 6 mm (0.24 inch)
Illustration 12 g03855796
Visual representation of the placement for plate (A), Backing Plate (1), and window plate (2) .
Using A36 steel or the original plate, fabricate two replacement windows as shown in Illustration 11.Note: Allow for a 6 mm (0.24 inch) gap between plate (A) and window (2). Refer