This document pertains to the Bosch APE series fuel injection pump, designed for use with Allis Chalmers diesel engines in industrial equipment. This pump is a critical component responsible for delivering precisely metered diesel fuel to the engine cylinders, ensuring efficient combustion and power output. Its robust construction, utilizing a plunger and barrel mechanism for fuel delivery and mechanical control for injection timing, underscores the engineering quality typical of Allis Chalmers industrial applications. Understanding the function and maintenance of this fuel injection pump is essential for the reliable operation of the associated diesel engines. This parts manual provides comprehensive information for the identification and servicing of the Bosch APE fuel injection pump. It details all replaceable components, offering part numbers essential for accurate ordering and replacement. The manual includes crucial repair guidelines, emphasizing the paramount importance of cleanliness during disassembly and reassembly. Step-by-step instructions for pump reassembly are provided, alongside potential troubleshooting guidance for common operational issues. This resource is invaluable for owners, mechanics, and technicians seeking to maintain, repair, and ensure the optimal performance of their Allis Chalmers industrial engines equipped with this fuel injection system.