The Case 621E, a robust E Series wheel loader, is engineered for demanding operational environments. Featuring a powerful Tier 3 compliant Cummins diesel engine displacing 6.7 liters and producing 163 horsepower, it is built for reliability and efficiency. Its design emphasizes durability and performance, making it suitable for a wide range of heavy-duty applications, from construction sites to material handling operations. The 621E is equipped with a 4-speed Powershift transmission, a 2.0 m³ bucket capacity, and a rated operating load of 3,600 kg, underscoring its capacity for substantial work. This comprehensive Service Repair Manual provides detailed information essential for the maintenance and repair of the Case 621E wheel loader. It covers critical areas including engine specifications, transmission operation, hydraulic system details, and maintenance schedules, such as the 500-hour engine oil service interval. With approximately 1500+ pages of technical guidance, this manual serves as an indispensable resource for owners, technicians, and mechanics, ensuring the longevity and optimal performance of the equipment through accurate procedures and specifications.