This manual covers the 621F and 721F Wheel Loaders from the F Series, designed for demanding work environments. These Tier 4 compliant machines are powered by N45 "PowerShift" diesel engines, featuring turbocharging and intercooling for robust performance. The 621F model offers a maximum power of 130 hp, while the 721F delivers 140 hp, both utilizing a 4.5 L displacement. Engineered for reliability and efficiency, these wheel loaders are equipped with a 4-speed forward and 4-speed reverse Powershift transmission, making them versatile tools for various industrial and construction applications. This comprehensive Service Repair Manual and Operator's Manual provides essential information for maintaining and operating your wheel loader. It details critical maintenance procedures, including fluid capacities and service intervals for engine oil, hydraulic filters, and air filters. Technical specifications, troubleshooting guides, and safety guidelines are also included to ensure optimal performance and longevity of the equipment. This improved quality, searchable manual is designed to assist owners, mechanics, and technicians in effectively managing and repairing the 621F and 721F models.