ROD A.-CONT. 4B7338 - Caterpillar

Welding Preparation
Remove all oil, grease, paint, and dirt from the damaged surface. Also, remove surface oxides from the area being repaired.Note: Good cleaning and surface preparation are important to ensure a good quality of repair.
Remove the cracks and cracked welds with gouging and form a "V" shaped bevel along the size of the crack with sufficient depth and length to cover the entire crack.
Protect all machined surfaces, electrical wiring, and hoses/lines from sparks or spatter produced by the weld removal, welding chipping, and/or grinding operations.
When the base metal temperature is below 0° C (32.0° F), metal must be preheated to at least 16° C (60.8° F). This minimum temperature must be maintained throughout the procedure.
To reduce the chance of weld distortion, minimize the heat generated by the welding procedure.
Follow this procedure prior to welding on the machine to prevent damage to electronic controls:
Turn OFF the engine and put the key start switch in the OFF position.
Disconnect the negative battery cable at the battery or if the motor grader is equipped with a battery disconnect switch, open the switch. The open position is also the position for machine service and/or storage.
Placing the ground clamp as close as possible to the weld will help reduce the possibility of electrical current damage to bearings, hydraulic components, and electrical components.
Do not use electrical components (ECM sensors) or electrical component ground points for grounding the welder.
Repair Procedure
Note: Repair one side of the upper tower at a time. Make sure all the new parts are welded in place before repairing the other side of the upper tower. Weld repair on one side may not provide adequate repair life.
Illustration 8 g03541899
(B) 113-5124 Plates (C) 113-5113 Plates (D) 6C-1787 Boss (E) 113-5120 Plate
Remove 113-5124 Plates (B) in order to access the cracking.
Follow the weld repair procedures as described above and refer to Special Instruction, REHS1841, "General Weld Procedures".
If cracks are present, gouge out the crack in 113-5113 Plate (C) and 113-5119 Plate (A) and form a "V" bevel (based on crack depth) along the crack line 20 mm (0.8 inch) to 30 mm (1.2 inch) beyond visible crack length at each end.
If present, weld cracks in 113-5113 Plate (C) and 113-5119 Plate (A) and grind the outside surface of welds flush with surface of 113-5113 Plate (C) and 113-5119 Plate (A). UT inspect weld repair if possible to ensure good quality of the welds.
Clean up the surfaces of the outside diameter of existing 6C-1787 Bosses (D) and 113-5120 Plate (E) .
Illustration 9 g03543258
Relocate 087-6059 Boss (F) (clip point for third valve lines gp) as shown above.Note: Hose and tube needs to be replaced by 330-7721 Hose Assembly and 349-9340 Tube Assembly .
(G) 145.6 mm (5.732 inch)
(H) 4.2 mm (0.165 inch)
Illustration 10 g03543358
Weld as specified from (J) to (K) .
Locate 350-0708 Plate (1) and 350-0709 Plate (2) to add 10 mm (0.393 inch) X 10 mm (0.393 inch) chamfer