HOUSING AS-AIR CLEANER 5N9369 - Caterpillar

Clean the area that will be welded. Make sure that the substances that follow are removed from the area that will be welded.
Oil
Grease
Paint
DirtIf the temperature of the base metal is below 0 °C (32 °F), heat the base metal to a temperature of at least 21 °C (70 °F). Maintain the temperature of the base metal at 21 °C (70 °F) during the welding process.Note: Heat distortion of the base metal is possible when you weld. Avoid excessive heating of the base metal.Attach the welding ground cable directly to the base metal. Protect machined surfaces from sparks. Protect the machined surfaces from the weld splatter.Repair Procedure
Prepare the Area and Remove the Flaws
Refer to Special Instruction, REHS1841, "General Weld Procedures" for general welding procedures.
Remove any components or hoses to access all sides of the non-engine-end frame lift cylinder casting weld cracks.
Before welding or arc airing, the area to be repaired must be at least 21 ° C (70° F) and the surface must be dry and free of moisture, paint, and grease by preheating.
Refer to Special Instruction, REHS0252, "Y-Pin Support Casting Repair Procedure" to cut the frame to access the inside of the frame and repair any casting flaws and backside of the support casting welds.
Use dye penetrate to confirm removal of the flaws.
Grind the area that was air arced to remove any slag and carbon pickup. Y-Pin Support Casting Welding Procedure
Illustration 1 g03693781
Support casting cross section
(A) 230 mm (9.0 inch)
(B) 232 to 234 mm (9.1 to 9.2 inch)
(C) 97 to 101 mm (3.8 to 4.0 inch)
(E) 100 mm (3.9 inch)
(F) 230.5 mm (9.07 inch)
(G) 230.9 mm (9.09 inch)
Illustration 2 g03693782
View of area D
Support weld cross section
(H) 35 degree maximum
(J) 30 to 35 mm (1.2 to 1.4 inch) weld leg
(W1) 25 mm (1.0 inch) bevel weld
(W2) 25 x 30 mm (1.2 inch) fillet weld
(K) 25 to 30 mm (1.0 to 1.2 inch) weld leg
(L) 18 mm (0.7 inch) weld throat minimum
Refer to Illustration 1 for details of support casting (1) and side plate.
Install tie bars across the frame as needed to prevent movement of the support casting (1) during the weld repair.
Using air arc method, remove the flaw in the support casting (1) weld toes and grind the surfaces clean.
Access the weld crack from the inside of the frame if the weld crack has propagated through the side plate. Refer to Special Instruction, REHS0252, "Y-Pin Support Casting Repair Procedure" for more information.
Remove any flaws in the parent material of the side plate.
Gouge and grind a second groove from the opposite side, if the crack is all the way through the thickness of the side plate.
Make a V-shaped groove for the weld plate repairs. The width of the groove must be two times the depth of the groove.
Start weld repair process from the inside of the frame. After having the inside welded up, back gouge out first root passes until coming in contact with the new weld repair. The grooves can be welded back in and ground flush on both surfaces.
Weld repair