HOSE AS. 2939976 - Caterpillar

Illustration 58 g02563880
Weld plates on the boom
Weld the reinforcement plates for the rear baffle plate and the boom foot. Weld (W1) length A-D, B-C, F-G, and E-H. Weld (W2) length A-B, E-F, and G-H. Weld (W3) length C-D. Refer to Illustration 58.
Refer to Table 15 for weld specifications.
Table 15
Welding Specifications    
Model    M 6.18    M 6.5    
Part Number    290-9249    290-9237    
Item    Description    
W1    
12 mm (0.5 inch)
butt weld    
12 mm (0.5 inch)
butt weld    
W2    
10 mm (0.4nch)
fillet weld    
10 mm (0.4nch)
fillet weld    
W3    
12 mm (0.5 inch)
butt weld
36 mm (1.4 inch)
wide. Grind the weld smooth.    
12 mm (0.5 inch)
butt weld
36 mm (1.4 inch)
wide. Grind the weld smooth.    
Grind the finished surface of the welds. Make sure that the radius of the weld toe is controlled to a minimum of 3 mm (0.12 inch) in order to maximize the fatigue life. Make sure that there are no notches or abrupt transitions. Use a brush or an air gun and remove any water, oil, dust, or any weld splatter.
Apply primer paint for corrosion control. Apply touch-up paint on the area with the repaired welds.Stress Relief of the Boom
Booms from the factory have been stress relieved in order to extend the life of the structure. The effects of the heat from cutting and welding eliminate the benefit of the stress relief. After a boom is repaired, consider stress relief of the structure because of the known benefits.Maintain the Alignment of the Bores
Illustration 59 g02529939
Bore alignment
Table 16
Bore Alignment Dimensions (1)    
Model    M 6.18    M 6.5    
Part Number    290-9249    290-9237    
Callout    Measurement    
A    
109.957 mm (4.329 inch)    
109.957 mm (4.329 inch)    
C    
1063 mm (41.9 inch)    
1122 mm (44.2 inch)    
D    
2634 mm (103.7 inch)    
2610 mm (102.8 inch)    
E    
50.9 mm (2.0 inch) - nominal
47.9 mm (1.9 inch) - minimum    
50.9 mm (2.0 inch) - nominal
47.9 mm (1.9 inch) - minimum    
F    
6180 mm (243.3 inch)    
6500 mm (255.9 inch)    
G    
140 0.032 mm (5.5 0.001 inch)    
140 0.032 mm (5.5 0.001 inch)    
( 1 ) Refer to Illustration 59Heat from welding and cutting causes distortion that can change critical dimensional relationships. The measurement of the axis for the bore at the boom foot (PT1) relative to the axis for the bore at the pivot boss (PT2) should be performed after the repair. Refer to Illustration 59. Make sure that the pin for the boom foot will enter the bore. Maintain the parallel position of the bores. Maintain the distance between the axis of each bore. Dimensional conformance is critical for the assembly of the pins and the boom cylinders.Remove the bearings, if necessary. Weld the bore (PT1). Machine the bore to the correct diameter. Install new bearings. Confirm that the conformance between the bores has been maintained.