The Case 521F and 621F mid-weight wheel loaders have Tier 4-Interim engines and 100-percent locking front differentials.
The loaders use a Fiat Power Train common rail diesel engine to meet the the Tier 4-Interim standard, and, like larger Case F Series models, they employ selective catalytic reduction (SCR) with diesel exhaust fluid. There is no requirement for a diesel particulate filter and the company says SCR technology results in a 10-percent fuel saving and improved engine performance compared with the previous generation.
Operators can choose from four working modes: Max, Economy, Normal and Auto. This allows the operator to find the most effective solution for every application. An outstanding flat torque curve delivers rapid response to power demands, boosting digging and loading performance, and providing rapid acceleration for load and carry operation, according to Case.
The loaders feature ZF auto powershift transmissions and new heavy-duty axles, front and rear. Designed with a three-piece housing, the axles use wet multiple disc brakes for maximum stopping power with low maintenance requirements.
The front axle offers a 100-percent auto-lock facility, an improvement over the 75-percent lock offered by a limited slip differential. This delivers maximum digging traction when attacking a face or stockpile.