This comprehensive workshop service repair manual covers Massey Ferguson MF135 and MF148 tractor models. These iconic utility tractors, produced from the mid-1960s to the late 1970s, are renowned for their reliability and versatility, serving agricultural needs across various applications. The MF135, typically featuring a 2.5-liter diesel engine producing around 45-55 horsepower, and the slightly more powerful MF148, with similar displacement and an output of approximately 55-65 horsepower, represent robust engineering designed for demanding work. Their enduring legacy is built on a foundation of solid construction and practical functionality, making them a valuable asset for farm operations. This manual provides detailed, step-by-step instructions for all service and repair procedures, covering every aspect of the MF135 and MF148 tractors from A-Z. It is an essential resource for owners, farm mechanics, and agricultural workshops, enabling them to perform maintenance and repairs efficiently, thereby saving significant costs. The manual thoroughly details engine overhaul, transmission repairs, hydraulic system maintenance, steering and brake system servicing, electrical troubleshooting, and chassis work. It includes routine maintenance schedules, diagnostic guides, overhaul procedures, adjustment specifications, and critical torquing data, all presented in an easy-to-follow format with accompanying illustrations to ensure accurate and professional upkeep of these dependable Massey Ferguson tractors.