Drive mechanism for a four-wheel-driving tractor

A four-wheel drive tractor transmission comprising a transmission housing, outer and inner input shafts in double tube construction having plural speed change gears and disposed to extend longitudinally of said transmission housing, travel speed change shaft means having at least first and second axially aligned gearing shafts extending longitudinally beneath said input shafts, said first and second gearing shafts each being provided with speed change gears, said housing further including differential gearing for driving a set of rear wheels, and a power-take-off shaft disposed rearwardly of the differential gearing and connected to said inner input shaft, said transmission further comprising:

• a power-take-off gear mounted on said second gearing shaft in proximity to said differential gearing,
• front wheel drive shaft means disposed co-extensively with and beneath said travel speed change shaft means, said front wheel drive shaft means provided with front and rear gear means, said rear gear means arranged to engage said power-take-off gear, and
• a forwardly projecting transmission shaft means disposed beneath the front wheel drive-shaft means and a gear mounted on said transmission shaft means arranged to engage a gear disposed on said front wheel drive-shaft means whereby power can be transmitted to a set of front wheels.