Deere Power Systems Group
LITHO IN U.S.A.
This manual is written for an experienced technician.
Essential tools required in performing certain service
work are identified in this manual and are
recommended for use.
Live with safety: Read the safety messages in the
introduction of this manual and the cautions presented
throughout the text of the manual.
CAUTION: This is the safety-alert symbol.
When you see this symbol on the machine
or in this manual, be alert to the potential for
This Component Technical Manual (CTM) contains the
latest available instructions necessary to repair engine
alternators and starter motors. It includes theory of
operation, and diagnostic and testing procedures to
help troubleshoot and understand potential failure
The information is organized in sections and groups by
various suppliers. At the beginning of each repair
group are summary listings of all applicable essential
tools, service equipment and tools, other materials
needed to do the job, service parts kits, specifications,
wear tolerances, and torque values.
Component Technical Manuals are concise service
guides for specific components. They are written as
stand-alone manuals covering multiple machine
Fundamental service information is available from
other sources covering basic theory of operation,
fundamentals of troubleshooting, general maintenance,
and basic types of failures and their causes.
This manual covers alternator and starter motor
applications for all John Deere diesel engines—
both older 300/400/500-Series and newer
POWERTECH 2.9 L—12.5 L engines. This manual
covers components for both Deere OEM engines
and Deere machine engine applications.
NOTE: Remanufactured alternators and starter motors
are available for replacement on most
applications listed in this manual. Refer to
John Deere’s “Remanufactured Components”
catalogs to cross-reference your o