Abstract: A transmission comprises: an input shaft intended to be coupled to a motor; an output shaft; an epicyclic reduction unit with an input sun wheel, a ring gear and first and second output shafts respectively fast and slow; a first clutch for connecting the input sun wheel to the ring gear of the said reduction unit; an hydraulic variator unit coupled between the input shaft of the transmission and the input sun wheel; second and third clutches operable to connect the input shaft of the transmission with the ring gear of the epicyclic reduction gear unit to give respective transmission ratios of opposite sign, respectively for forward and reverse gears. The arrangement is such that when the output speed of the variator varies over a predetermined range on either side of zero, and the first clutch is disengaged and the second or third clutch is engaged, the first and the second output shaft of the epicyclic reduction unit have respective speeds which vary over respective ranges of contiguous values.

Abstract: A transmission comprises: an input shaft intended to be coupled to a motor; an output shaft; an epicyclic reduction unit with an input sun wheel, a ring and first and second output shafts respectively fast and slow; a first clutch for connecting the input sun wheel to the ring gear of the said reduction unit; an hydraulic variator unit coupled between the input shaft of the transmission and this input sun wheel; second and third clutches operable to connect the input shaft of the transmission with the ring gear of the epicyclic reduction gear unit to give respective transmission ratios of opposite sign, respectively for forward and reverse gears. The arrangement is such that when the output speed of the variator varies over a predetermined range on either side of zero, and the first clutch is disengaged and the second or third clutch is engaged, the first and the second output shaft of the epicyclic reduction unit have respective speeds which vary over respective ranges of contiguous values.

Abstract: A prime mover assembly comprising a prime mover and a control therefor, said control having a lever movable in a first plane to vary the rotational speed of said prime mover and movable in a second plane to stop said prime mover.

Abstract: In a crawler vehicle having a rear housing or frame: a pair of hydrostatic transmission pumps located on the center line of the crawler are connected to a pair of motors arranged along the transverse axis by a manifold to form a cruciform unit. The cruciform unit is mounted in the rear housing.

Abstract: In a crawler having a rear housing or frame a pair of hydrostatic transmission pumps are mounted back-to-back and interconnected by a manifold which acts as a mounting for the pumps on to the rear housing. One pump is located within the rear housing and the other pump is outside.

Abstract: In a crawler vehicle having a rear housing or frame a splitter gearbox and double hydraulic pump for a hydrostatic transmission are mounted on the front flange of the rear housing for ease of servicing and plumbing. A single driveshaft from the engine drives the gearbox and an extra pump may be mounted on the splitter gearbox. The single driveshaft may constitute a power-take-off drive.