SCREW 3F3457 - Caterpillar

Use the dimensions shown in Illustration 212 to measure and mark for the second layer of weld.
Illustration 213 g06275712
View of a bur bit used to identify the outline for weld third weld layer
Use a rotary bur bit to identify outline marking.
Illustration 214 g06275716
View of the third weld layer
Weld a vertical up pass in the shallow groove produced by the rotary bur bit. Then weld horizontal surfacing welds from the bottom to the top for the outlined area. When completed the first layer should appear similar to the weld shown in Illustration 214.
Illustration 215 g06275732
View of the marked outline for fourth weld layer
(D1) 10 mm (0.40 inch) down from the top
(D2) 40 mm (1.60 inch) in from the left
(D3) 20 mm (0.80 inch) up from the bottom
(D4) 5 mm (0.20 inch) in from the right
Use the dimensions shown in Illustration 215 to measure and mark for the second layer of weld.
Illustration 216 g06275745
View of a bur bit used to identify the outline for welding the fourth weld layer
Use a rotary bur bit to identify outline marking.
Illustration 217 g06275806
View of the fourth weld layer
Weld a vertical up pass in the shallow groove produced by the rotary bur bit. Then weld horizontal surfacing welds from the bottom to the top for the outlined area. When completed the first layer should appear similar to the weld shown in Illustration 217.
Illustration 218 g06275813
View of low spots identified
Once the four layers of welding have been completed, sand and blend all four weld layers into one layer. Some additional welding may be required prior to using the aluminum profile gages.Illustration 218 is an example of the four weld layers blend sanded into one layer, but some low spots have been identified.
Illustration 219 g06275815
View of low spots filled by welding
Instead of continuing to blend sand, fill in the low spots by welding to avoid removing too much material. Refer to Illustration 219.
Blend sand the additional weld metal and then use the aluminum profile gages to determine high and low spots.Note: Refer to the RH FSSC section for detailed instructions on how to use the aluminum profile gages.
Illustration 220 g06275893
View of using the vertical aluminum profile gage 9–10 to identify a high spot
Illustration 221 g06275897
View of the horizontal profile gage 5–6 used to identify high spots
Illustration 220 and Illustration 221 show using the vertical and horizontal profile gages to identify a high spot requiring more sanding.Note: The high spot is identified by both gages in the vertical and horizontal directions.
Continue the process of evaluating the profile using profile gages, marking the high spots and sanding to profile until the desired overall profile has been achieved.Note: The main objective is to achieve the approximate profile for the four critical profile gages. A gap of 2 mm (0.08 inch) or less is sufficient as long as the profile has no abrupt high or low spots.
Illustration 222 g06275923
View of the completed profile on the LH FSSC
Once the desired profile has been achieved, check the surface area using MT. If required, make the necessary repairs and recheck until no rejectable indications