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Introduction
This Special Instruction provides the procedure to repower a 235C Excavator. The replacement engine for the machine will be a Tier I level 3306B Engine. The 235C Excavator was originally equipped with a 3306 Engine. This Special Instruction will provide the information to install the Tier I level replacement engine.
Table 1
Engine Arrangement
Original Engine Replacement Engine
9Y-0032 Engine Ar 108-2447 Engine Ar(1)
20R-2521 Engine Ar(2)
7W-9635 Engine Ar
4P-7467 Engine Ar
(1) New Repower Engine
(2) Reman EngineThis 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. If errors are found, please submit feedback in SIS Web or contact the Emissions Retrofit Group.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 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 of the compressor for the turbocharger bypass, fuel metering valve, and sensors.
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 component that will be welded. Place the clamp as close as possible to the weld to reduce the possibility of welding current damage to the engine bearings to the electrical components and to other engine components.
Use standard welding procedures to weld the materials together.Required Parts
Refer to Parts Manual, SEBP5309.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
Repower Parts
304-3665 Conversion Ar - Repower
Qty Part Number Part Name Description
Engine Options
1 108-2447 Engine Ar New repower engine
1 20R-2521 Complete Engine Ar Reman Engine
Required Parts
1 461-5252 Engine Conversion Kit This kit is non-serviceable and provides a breakdown of the serviceable parts required for the repower, excluding the engine and optional groups. For line drawings and group structure refer to 304-3665 Engine Conversion Ar. Engine and Machine Preparation
Remove the original engine from the machine.
Clean any debris and grease from the machine frame.