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For forestry work, the Cat 521 track feller buncher has a 284-horsepower, Cat C9 ACERT engine. All four models in this series contain a fuel/water separator, engine air intake heater and a dual-stage combination air cleaner with pre-cleaner. The Cat 521 includes a dedicated 200-cc variable displacement pump for travel circuit, a 190-cc variable displacement pump for boom and implement functions and a dedicated 55-cc variable displacement pump for felling and processing attachments. The 521 also includes integrated welded track guards.