PUMP GP-PISTON 3699655 - Caterpillar

Introduction
This special instruction includes the procedure to rework 430-6761 High Dump Bucket on certain wheel loaders. This procedure is needed to improve the life of the current high dump buckets in the field. Disassembly of the bucket assembly from the frame assembly is not necessary. Do not perform any procedures or order any part until you understand the information.ReferenceService Guide, SEBD0512, "Caterpillar Service Welding Guide"ReferenceSpecial Instruction, REHS1841, "General Welding Procedures"Safety
Improper operation, lubrication, maintenance or repair of this product can be dangerous and could result in injury or death.Do not operate or perform any lubrication, maintenance or repair on this product, until you have read and understood the operation, lubrication, maintenance and repair information.
Personal injury can result from flame cutting or welding on painted areas.The effect of gasses from burned paint is a hazard to the person doing the cutting or welding.Do not flame cut or weld on painted areas.
Welding Requirements
Welding quality is critical to the success of the installation procedures. Welds must be smooth and continuous. Do not undercut the welds. No overlap is allowed. Grind the ends of the welds to a smooth radius.Prepare the metal for welding according to the next section. Refer to the illustrations in this special instruction for welding symbols and specifications.Be sure that all electrodes are dried. The electrodes can be dried by heating the electrodes to 300°C (572°F). The electrodes must be dried for at least 30 minutes.Do not weld in windy conditions. Do not weld when temperatures are below 16°C (60°F).Penetration characteristics may vary greatly depending on the following conditions:
Electrode diameter
Shielding gas
Welding current
Plate thicknessThe following items also affect the welds:
Geometry of welded joints
Surface conditions
Composition of the base metal and of the electrodeFor more welding information, consult the General Welding Procedures, REHS1841.Preparing the Metal for Welding
All grease, paint, and foreign objects must be removed before welding. Any of these materials will discharge gas which will cause porosity in the weld deposit. Water and rust will cause hydrogen embrittlement. Hydrogen embrittlement causes cracks in the weld deposit.Remove foreign objects with a wire brush, a buffer, or a grinder. Shot blasting the appropriate areas will also remove foreign material.Note: After welding, allow all areas to cool to room temperature. After the areas have cooled, paint the area with primer. After the primer has dried, coat the area with Cat 4C-4200 Yellow Paint .Parts List
Table 1
457-3058 Rework Kit    
Item     Qty     Part
Number     Description`    
1     1     452-4174     Plate (Right)    
2     1     452-4184     Plate As    
3     1     452-4190     Plate As    
4     1     452-4191     Plate (Left)    Rework Procedure
Disassemble all hydraulic lines in the affected area. Clean paint from all surfaces to be welded.
Illustration 1 g03629256
(1) 452-4174 Plate (Right) (4) 452-4191 Plate (Left)
Place plates (1) and (4). Chamfers should be exposed.
Weld around plates (1) and (4) with a 6 mm (0.24 inch) weld. Penetrate existing welds.
Illustration