Hydraulic valve for two-speed power take-off drive

A two-speed power take-off drive for a tractor comprising, an input shaft, an output shaft means, a first and a second gearset for selectively driving between said input shaft and said output shaft, a first and a second hydraulic clutch and a hydraulic valve for selectively engaging one of said two first and second gearsets, a reversible stub shaft in said output shaft means operating said valve responsive to selective and alternative positioning of said reversible stub shaft for selective operation of said clutches operating said power take off drive in each of two speeds.