BEARING-ROLLER 2478713 - Caterpillar

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.
Be sure all personnel are clear of equipment while equipment is being lowered.Failure to stay clear may result in personal injury.
Hydraulic oil pressure can remain in the hydraulic systems after the engine and pump have been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic systems. To prevent possible injury, refer to the section, Testing and Adjusting, "Hydraulic System Pressure - Release" before any fitting, hose or component is loosened, tightened, removed or adjusted.When possible, the bucket or attachment must always be lowered to the ground before service is started. When it is necessary for the boom to be in the raised position while tests or adjustments are done, be sure that the boom, stick and bucket or attachment have correct support.The swing lock (if equipped) must be engaged before service is started.Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.
Accidental engine starting can cause injury or death to personnel working on the equipment.To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system.Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Before carrying out arc welding on the machine or on any equipment attached to the machine, disconnect all power and ground leads from the batteries in order to avoid possible damage to electronic components.
Grinding Procedure
General grinding procedure for eliminating the welding surface at high stress concentration area.
Illustration 1 g03815792
Position the machine on level ground. Fully retract the stick cylinder and the bucket cylinder. Retract the boom cylinders until the bucket tip is flat on the ground as shown in Illustration 1.
Illustration 2 g03815827
Use a grinder in order to eliminate both the sides of the original PT4 boss butt weld until parallel with the base metal. Refer to the weld seam grinding area in Illustration 2.
Illustration 3 g03815889
Note: The direction of the grinding is perpendicular to PT4 boss butt weld when grinding as shown in Illustration 6.
Illustration 4 g03815897
Note: Allow the grinding range with 20