HEADLAMP G-12V 6D1650 - Caterpillar

Repeat Failures of the Excavator Bucket Hinge
Repeat hinge plate cracking or failures is typically attributed to high hinge plate stress. The stress is due to the customers-specific application. An application with a high amount of corner loading of the bucket will cause the cracking or failures.
Illustration 9 g01948753
Typical view (9) UndertubeIf failures continue to occur after the installation of an undertube, the bucket is most likely not appropriate for the customers application. Please contact your dealerships sales department, or the Cat Work Tool Sales Representative assigned to your dealership for alternative bucket options (both production and engineered to order bucket products).Installation of the Undertube on the Bucket
Use the following instructions to install an undertube on the bucket.
Table 9
Undertubes    
Part Number     Description     Linkage Family    
373-1327     Plate     312, 315, B, CB    
373-1328     Plate     DB, TB    
373-1329     Plate     UB, VB    
338-7606     Plate     HB    
338-7609     Plate     JB    
Illustration 10 g02460777
Typical view (A) Hinge finger (B) Gusset
Trim two hinge fingers (A) so that the undertube will fit correctly.
Remove two gussets (B) from the bucket. Retain gussets (B) .Note: Refer to Special Instruction, REHS1841, "General Welding Procedures" before performing any welding. Remove any paint, dirt, grease, or debris from the mounting surfaces.
Illustration 11 g02460832
Typical view (C) Upper torque tube (3) Undertube (W1) Fillet Weld with 1.5 mm (0.059 inch) penetration (W2) Fillet Weld with 1.5 mm (0.059 inch) penetration
Locate undertube (3) to the bottom of the hinge plate.Note: Ensure that the front edge of undertube (3) is inline with the front of upper torque tube (C) .Note: If required, cut undertube (3) to the proper length. The proper length of the undertube may vary, depending on the width of your bucket.
Weld undertube (3) into place using the guidelines in Table 10.
Table 10
Weld Specifications    
Part Number     Description     Thickness     W1     W2    
Fillet Weld with
1.5 mm (0.059 inch) penetration Fillet Weld with
1.5 mm (0.059 inch) penetration
373-1327     Plate    
12 mm (0.472 inch)    
12 mm (0.472 inch)    
16 mm (0.63 inch)    
373-1328     Plate    
18 mm (0.708 inch)    
20 mm (0.787 inch)    
26 mm (1.02 inch)    
373-1329     Plate    
30 mm (1.181 inch)    
20 mm (0.787 inch) over a
12 mm (0.472 inch) bevel    
30 mm (1.181 inch)    
338-7606     Plate    
30 mm (1.181 inch)    
20 mm (0.787 inch) over a
12 mm (0.472 inch) bevel    
30 mm (1.181 inch)    
338-7609     Plate    
30 mm (1.181 inch)    
20 mm (0.787 inch) over a
12 mm (0.472 inch) bevel    
30 mm (1.181 inch)    
Illustration 12 g02460884
Typical view (B) Gusset (3) Undertube (W3) Bevel Weld (W4) Bevel Weld
Position two gussets (B) back onto the bucket.Note: Gussets (B) were removed in Step 2.
Weld two gussets (B) to the bucket and to undertube (3) using the guidelines