CYLINDER GP-STEERING 3953475 - Caterpillar

Illustration 8 g01567576
View D-D
(P) 60 mm (2.4 inch)
(Q) 40 mm (1.6 inch)Do not start the weld and do not stop the weld in Zone (N). Refer to Illustration 7.Crossmember
Illustration 9 g01567593
(W9) 30 mm (1.2 inch) J-groove weld
(W10) 50 mm (2.0 inch) fillet weld
(W11) 45 mm (1.8 inch) fillet weld
Illustration 10 g01572075
View of Area (R)
( S) Zone (S)
( T) 45 mm (1.8 inch)
(U) 50 mm (2.0 inch)
(V) Crossmember
Illustration 11 g01567594
(W) 27.5°
(ZZ) 180° zoneThe weld must blend to the radius on crossmember (V) regardless of the variations in the casting.The starting point on each weld pass must be staggered by a minimum of ten degrees.Do not start the weld and do not stop the weld in Zone (ZZ). Refer to Illustration 11.Note: Do not allow the grinder to undercut the weld.Weld Procedures for All Areas
Remove all traces of paint, oil, grease, or any other contaminants from the area that will be repaired. If necessary, partially disassemble the machine to gain the best possible access to the zone that will be repaired. Clean the structure of the lift arm assembly to the bare steel by sand blasting, torch, or paint remover. Sand blasting is the preferred cleaning procedure.
Illustration 12 g01567974
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Use a dye penetrant to establish the extent of the crack. Illustration 12 and Illustration 13 clearly show the defined limits of cracking on a lift arm assembly that has been prepared for repair of the welds.
The machine should be moved to a covered repair shop for the repairs. If this is not possible, use tarpaulin covers to shield the area from the effects of wind. The use of tarpaulin covers is the minimum acceptable procedure. In winter environments with low ambient temperatures, the machine must be placed inside a heated repair shop. This will be the only satisfactory method for making repairs to the welds of the lift arm assembly in these conditions.
Use an air carbon arc torch tocarefully remove all traces of the crack. Make sure that the full depth of the crack is removed. Use the dye penetrant to check the crack again. Make sure that all traces of the crack have been removed. Use the dye penetrant again to be certain that all traces of the crack have been removed.
Grind the areas that were cut out in Step 4 to remove any remaining carbon from the air carbon arc. The presence of carbon can adversely affect the quality of the final weld. Prepare a V-groove that has an included angle between 60 degrees and 90 degrees. The angle will depend on the depth of the groove. The groove should be cut to the full depth of the crack. The width of the base of the groove must allow comfortable access for the welding torch.
Illustration 14 g01567977
Preheat the area that will be repaired to a minimum temperature of 100 °C (212 °F). To prevent changes to the properties of the base material, do not exceed a temperature of 315 °C (600 °F). Use an infrared thermometer to check the temperature. Continue to measure the