0319574 JOHNSON SCREW, Shift lock detent

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 I level 3406C engine. See table 1 for the engine arrangement numbers. The original engine is not regulated for emissions. This Special Instruction will provide the information in order to install the Tier 1 level replacement engine.
Table 1
Engine Arrangements
Original Engine Replacement Engine
4N-2252 Engine Ar 124-4675 Engine Ar(1)
20R-2544 Engine Ar(2)
8N-5405 Engine Ar
(1) New Repower Engine
(2) Reman EngineThis Special Instruction does not include procedures that can be found in the existing manuals. Refer to the original Service Manual, Parts Manual, and Operation and Maintenance Manual for more information.When this procedure is completed, 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.This instruction contains some procedures that come from dealer feedback. The emissions replacement engine is not a direct replacement. Additional parts and labor hours may be needed to complete this engine replacement. Variations in machine serial number breaks or options could cause discrepancy in the modifications, required parts, and labor hours to complete this procedure. This documentation is a guideline for Cat Dealer personnel in order to complete the repower procedure. If errors are found, submit feedback in SIS Web or contact the Emissions Solutions Group. The information that follows will be required:
Machine serial number
Original engine arrangement number
Original engine serial number
Emissions engine arrangement number
Details of the error
Photos of the error and after the proposed solutionRegister 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 Letter.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.
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.
Welding on Electronically Controlled Engines
Proper welding procedures are necessary in order to avoid damage to electronic controls. Perform welding on the engine according to the following procedure.
Set the engine control to the "STOP" mode.
Turn OFF the fuel supply to the engine.
Disconnect the negative terminal from the battery.
Disconnect the electronic components of the engine from the wiring harnesses: ECM, throttle actuator, actuator for the turbocharger compressor bypass, fuel metering valve and sensor.
Protect the wiring harnesses from welding debris and/or from welding spatter.
Do NOT use electrical components (ECM or sensors) or electronic component grounding points for grounding the welder.
Connect the ground cable of the welder directly to the engine component that will be welded. Place the clamp as close as possible to the weld in order to reduce the possibility of welding current damage.
Use standard welding procedures to weld the materials together.Required Parts
Reference: Refer to Parts Manual, SEBP4385, "3406C Engine Emissions Retrofit Repower Tier I For 621B, 623B, 621E/F, 623E, And 627E/F Wheel Tractor Scraper".Note: The required parts are subject to some change. Refer to TMI for the most recent required parts list.Note: If part fabrication is necessary, ensure that all fabricated parts are deburred. Use caution when deburring parts. Avoid excessive grinding and notches.Note: A breakdown of the kit provides a parts list for the repower. The kit part number is not serviceable. Order the engine arrangement plus the list of parts provided in the kit.
Table 2
Qty