PIN 6F6573 - Caterpillar

Table 9
Welding Specifications
welding materials
This procedure is intended for buildup of sprocket hubs due to wear.
Filler Metals Current
Pass or Weld Layer Process Class Diameter Polarity Amps Volts / Travel Speed (ipm)
All FCAW E7018H4R 3.2 mm (0.125 inch) DCEP 100-125 NA
All FCAW E71T-1H8 1.2 mm (0.045 inch) DCEP 200-240 24-27 / 10-16
Joint Design
Comments: See specific details for various scenarios. Reworking the Tandem Drive Sprockets
This Special Instruction applies to the following part number with casting numbers. Part numbers with other casting numbers do not apply.
Table 10
Part Number Casting Number Description
278-3319 273-0070 Sprocket
278-3320 273-0071 Sprocket
278-3321 273-0072 Sprocket
278-3322 273-0073 Sprocket
Illustration 3 g03400409
View of Sprocket
(B) Surface that is acceptable to build up (360°)
Clean surface (B) so it can be welded.
Refer to "Welding Electrodes and Parameters" Section in this Special Instruction.
Orient hub so that welding can be performed in the flat position.
Ensure that the base material is at a minimum temperature of 24° C (75° F) before welding. Ensure that a minimum temperature of 24° C (75° F) is maintained throughout the entire welding procedure.
Repair the prepared surface utilizing the recommendations provided in the "Welding Electrodes and Parameters" Section in this Special Instruction.
Illustration 4 g03400480
Close up view of welded area
(C) 3 mm (0.12 inch)
Weld surfacing beads to achieve desired pre-machined dimensions. Each weld layer will add approximately 3 mm (0.12 inch).
Clean the weld area. Inspect the area that was welded. All weld quality shall conform to the criteria specified in the "Weld Inspection and Acceptance Criteria" section in this Special Instruction.
Illustration 5 g03400526
Machine surface (B) to finished dimension (D).
Dimension (D) for 273-0070 Sprocket is 103.2 0.13 mm (4.06 0.005 inch).
Dimension (D) for 273-0071 Sprocket is 57.15 0.13 mm (2.25 0.005 inch).
Dimension (D) for 273-0072 Sprocket is 79.27 0.13 mm (3.12 0.005 inch).
Dimension (D) for 273-0073 Sprocket is 49.14 0.25 mm (1.94 0.0098 inch).