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The Case 521F and 621F mid-weight wheeled loaders offer a 10% fuel saving with Tier 4 Interim engines, less tire wear and maintenance from heavy duty axles with open differentials, increased productivity from a 100% locking front differential lock and an effective cooling solution for dusty environments. The machines also offer increased maintenance safety with ground level access to all service points. The 521F and 621F use 4.7 litre and 6.7 litre second generation FPT common rail diesel engines to deliver high performance with 10% lower fuel consumption. To meet the Tier 4 Interim standard, as with larger Case F Series models, the 521F and 621F use selective catalytic reduction (SCR) with AdBlue. There is no requirement for a diesel particulate filter and this solution results in a 10% fuel saving and improved engine performance compared with the previous generation. Operators can choose from four working modes: Max, Economy, Normal and Auto.