This workshop manual provides comprehensive service and repair information for the CAV DPA Distributor, a hydraulic fuel pump designed for diesel engines. While specific production years are not detailed, this manual covers the Rotodiesel DPA type, a testament to CAV's engineering in fuel delivery systems. The DPA pump is known for its robust design and reliable performance in various applications, making it a crucial component for efficient engine operation. This manual is intended to be an essential resource for maintaining the integrity and functionality of these pumps. The purpose of this English-language workshop manual is to guide users through the service and repair of CAV DPA type hydraulic fuel pumps. It details common procedures such as calibration, adjustment, component replacement, and diagnostic testing. The manual emphasizes the use of approved CAV Lucas test and service stands, ensuring accurate and professional maintenance. By providing detailed technical specifications and repair guidelines, this resource empowers mechanics and technicians to effectively service and maintain the DPA distributor, ensuring its continued optimal performance.