ARRANJO DE ALAVANCA APERFEICOADO PARA TOMADA DE FORCA PARA UM TRATOR

摘要

An improved power take-off lever arrangement for a tractor is disclosed which prevents the inadvertent shifting of the PTO lever from a first to a second position. The lever arrangement includes a support plate secured to the tractor and has a pin extending outward therefrom which engages an oval aperture formed in a manually operated lever. The lever is connected to a control valve for hydraulically engaging a power take-off drive. The control valve is responsive to move to a second position with corresponding movement of the lever and is spring biased to move to a first position with corresponding movement of the lever when the hydraulic pressure falls below a predetermined value. The lever is also spring biased to the first position such that an attachment mechanism formed on both the lever and the pin engages. The improvement includes a keyway formed in the periphery of the pin which is aligned parallel to the central axis of the pin and a key formed on the inner circumference of the aperture in the lever. The key is aligned with and engages the keyway when the lever is in the first position and is out of alignment with the keyway but is in contact with the periphery of the pin when the lever is in the second position.