BOLT 5P4684 - Caterpillar

Excavator AllWheel Loader AllIntroduction
Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.While buckets are being loaded, the base edge assemblies will bend or bow and high stresses are developed in the adapter weld. The most severe stresses are concentrated at the start of the welds on the two strap adapters. The points of stress are at the front of the base edge where the welds begin. Consequently, the application of the welds in these areas must be of the highest quality.Weld quality is improved with the cleanliness of the metal surfaces. Surfaces must be free of paint, rust, dirt, and moisture. There must be good weld penetration into the adapter and the base edge. Weld quality is also determined by:
the good fusion between weld passes
application of multiple weld passes
the absence of abrupt starts of the weldThe metallurgical composition of the base edge and the adapters requires preheating.The use of low hydrogen welding electrodes or welding wire is required to prevent the formation of hydrogen in the weld. Trapped hydrogen can cause cracks to develop in the weld area.Preheating and slow cooling also allows any trapped hydrogen to escape. This action prevents excessive hardness from developing in areas that are near the weld. This action also reduces stresses that can occur from rapid cooling and weld shrinkage.Use the following recommended procedure for welding on all adapters for buckets to achieve maximum durability.Safety Section
Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
Failure to follow all safety guidelines prescribed in this document and by governing authorities and regulatory agencies may result in severe injury or death of personnel or machine damage.
When removing a major component or attachment, ensure that it is properly blocked or secured before removing mounting hardware. An assembly that is disconnected without proper blocking may shift or fall, resulting in serious injury or death of personnel or machine damage.
Personal injury or death can result from improper maintenance procedures. To avoid injury or death, follow the procedures exactly as stated below.
Personal injury can result from improper handling of chemicals.Make sure you use all the necessary protective equipment required to do the job.Make sure that you read and understand all directions and hazards described on the labels and material safety data sheet of any chemical that is used.Observe all safety precautions recommended by the chemical manufacturer for handling, storage, and disposal of chemicals.
Climbing equipment may be required to access this service point. Refer to the Operation and Maintenance Manual, "Mounting and Dismounting" topic for safety information.
Before servicing/performing maintenance on the machine, electrical power must be physically disconnected; battery plugs must be disconnected from the batteries, or the trailing cable must be unplugged, and warning tags and padlocks shall be