0304081 JOHNSON CONNECTOR 5 INCH LONGER PARTS

Introduction
This Special Instruction provides the procedure in order to repower a 621B or a 623B Wheeled Tractor Scraper. The replacement engine will be a Tier III level C15 ACERT engine. See the following table for the engine arrangement numbers. The 621B/623B Wheeled Tractor Scraper was originally equipped with a 3406 engine. The original 3406 engine is not regulated for emissions. This Special Instruction will provide the information in order to install the Tier III level replacement engine.
Table 1
Engine Arrangement
Original Engine New Engine
4N-2252 308-7665(1)
20R-1770(2)
8N-5405
(1) New Repower Engine
(2) Reman Engine - Requires SoftwareThis Special Instruction does not include procedures that can be found in your existing manuals. Refer to the original Service Manual, Parts Manual, and Operation and Maintenance Manual for more information.When you have completed this procedure, prepare the machine for service. Refer to the Operation and Maintenance Manual.Note: Do not perform any procedure in this Special Instruction until the information has been read and understood.Reference: Service Manual, Parts Manual, Operation and Maintenance Manual.Note: This instruction contains some procedures that come from dealer feedback. The emissions replacement engine is not a direct replacement. Additional parts and additional labor hours may be needed in order to complete this engine replacement. Variations in machine serial number breaks or options could cause a discrepancy in the modifications, parts needed, and labor hours to complete this repower. This documentation is a guideline for Caterpillar dealer personnel in order to complete the repower procedure. If errors are found, submit feedback in SIS Web or contact the Emissions Retrofit Group.
Machine serial number
Original engine arrangement number
Original engine serial number
Emissions engine arrangement number
Details of the error
Photos of the error and photos after the proposed solutionNew Engine Information Label
This repower process will require the engine to be reflashed with new software, if a reman engine is used. Use a new engine information label by using the standard process before performing the repower.Registering the Retrofit
Reference: Special Instruction, REHS5097, "Instructions to Register the Retrofit"Documenting changes to a machine configuration is an advantage to Caterpillar and the dealer technicians that are sent to repair a machine. By identifying that the machine has been reconfigured, the technician will have a better opportunity to have the correct parts, tooling, and service information. Identifying that the machine has been reconfigured will also allow Caterpillar to include the retrofitted serial numbers in applicable Service Letters.Safety
Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
Do not attempt to assemble this machine until you read and you understand the assembly instructions.Improper assembly procedures could result in injury or death.
Personal injury or death can result from improper lifting or blocking.When a hoist or jack is used to lift any part or component, stand clear of the area. Be sure the hoist or jack has the correct capacity to lift a component. Install blocks or stands before performance of any work under a heavy component.Approximate weights of the components are shown. Clean all surfaces where parts are to be installed.