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Motor hidráulico perfeccionado, caracterizado porque incorporados en un mismo cuerpo o carter además de los dos engranes que forman el rotor hidráulico propiamente dicho van integrados un conjunto de sinfin corona que forman un reductor de velocidad para ello el eje de un de los engranes del rotor es solidario al sinfin del reductor y el eje de la corona de éste saldrá hasta el exterior del carter en donde quedará rematado en un piñón de ataque que actuará directamente sobre el elemento a accionar.
Perfectionnements apportés aux pivots des grues agricoles et pelles hydrauliques pour permettre le passage de circuits hydrauliques concentriques, et la rotation des grues agricoles par moto-réducteur hydraulique