BRACKET AS 3105884 - Caterpillar

Illustration 7 g01026108
If oil leaks freely from the eye end of the rod or from the internal bore of the center tube a problem exists. This leak indicates that the inner tube is cracked or the tube is leaking at the weld eye. Replace the tube with a REMAN or a new Caterpillar part.
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If oil leaks from the piston end of the rod around the outside of the center tube, follow the ""Repair Procedure for Swaged Area"".Repair Procedure for Swaged Area
Drain all oil from the rod cavity.
Completely clean all parts of the rod.
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Heat the area to be welded with a torch to remove any moisture.Note: Heat the area to a maximum of 149°C (300°F). Use a 349-4202 Infrared Thermometer to measure the temperature.
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If additional weld access is needed, some rods can be bored out at the center of the piston end. This step provides increased access for welding. Refer to Table 5 for specifications on maximum bore and depth dimensions for each rod part number.
Table 5
Maximum Bore Specifications for the Piston End of the Rod    
Model     Rod Part Number     Diameter (A) mm (inch)     Depth (B) mm (inch)    
772
772G     290-3379
271-7542     54.0 (2.13)
36.9 mm (1.45 inch)     49.7 (1.96)
80 mm (3.15 inch)    
773/775     271-7543
9J-2542     54.0 (2.13)     49.7 (1.96)    
777     171-1236
8J-9437     60.0 (2.36)     60.6 (2.39)    
777     271-7544
300-0690     60.0 (2.36)     53.2 (2.09)    
785     4T-5951
271-7545     65.0 (2.56)     91.5 (3.60)
88.9 (3.50)    
789     4T-6100     66.0 (2.59)     91.0 (3.58)    
793     106-6552
121-2085
6E-0056
286-8256
271-7547     66.5 (2.61)     88.9 (3.50)
91.5 (3.60)
91.5 (3.60)
88.9 (3.50)
88.9 (3.50)    
795     304-8583     66.5 (2.61)     106 (4.17)    
797     219-9785
150-3017
271-7550
196-0150     117.3 (4.61)     116.5 (4.59)    
Use a MIG Welder with ER70-3 GMAW Lincoln L-50 wire or an E7018 SMAW stick. Weld the inner tube to the rod end.
Use a wire brush to clean the weld area.
Clean the rod completely.Note: Inspect and remove all burrs in the oil port passages prior to assembly.
Repeat the rod leak test outlined at the beginning of this document.
If the rod passes the leak test, assemble the cylinder using the proper procedure found in the specific Disassembly and Assembly manual. Test the assembled cylinder according to the process outlined in Tool Operating Manual, NEHT6503, "Procedure for Testing Hydraulic Cylinders Using 9U-6803 Hydraulic Cylinder Tester".