John Deere PowerTech 10.5L, 12.5L Diesel Engines Lucas Electronic Fuel Systems Repair Manual (CTM115)

This manual is written for an experienced technician. Special tools required in performing certain service work are identified in this manual and are recommended for use.

This manual (CTM115) covers only the dual rail fuel system on 10.5 L and 12.5 L engines with Lucas electronic fuel control. It is one of three volumes. The following two companion manuals cover the base engine and John Deere Level 6 electronic fuel systems:
• CTM100—10.5 L and 12.5 L Diesel Engines—Base Engine
• CTM188—10.5 L and 12.5 L Diesel Engines—Level 6 Electronic Fuel Systems With Lucas EUIs

This new CTM includes dual rail fuel system and electrical engine control repair procedures formerly in CTM100, Groups 35 and 45 (9NOV99). A complete set of all three manuals covering 10.5 L and 12.5 L engines can be procured by ordering CTM650 Binder Set.

Use this component technical manual in conjunction with the base engine repair manual (CTM100) and the respective machine technical manual. See repair manual for information on component removal and installation, and gaining access to the components. This manual is divided in three parts: repair, theory of operation and diagnostics. Repair procedures are provided for the fuel system and electrical engine control system. The theory of operation section contains information that explains how these engine subsystems operate.

The diagnostics section helps identify the cause of engine problems. Applicable special tools and other materials needed to do the job, specifications, and helpful reference materials are covered in separate groups toward end of manual. Engine Training Guide (DSEGET550A) is available to give the service technician a detailed overview of general engine construction and design features. This manual is recommended prior to performing major service procedures on POWERTECH® 6105 and 6125 engines. Fundamental service information is available from other sources covering basic theory of operation, fundamentals of troubleshooting, general maintenance, and basic type of failures and their causes. This manual contains SI Metric units of measure followed immediately by the U.S. customary units of measure. Most hardware on these engines is metric sized.