Abstract: Manual dual clutch power transmission unit 10 for a vehicle (tractor, constructional vehicle and the like), which comprises a synchro-shuttle transmission unit 10S (forward/reverse drive transmission), a hydro-mechanical operated a dual clutch unit 10D, a multi-speed transmission unit 10T (8 speed transmission unit), a range transmission unit 10R (3 ranges—low range, medium range and high range), a hydro-mechanical transmission control mechanism 100 which controls shifting and selection of gears (odd gear and/or even gear) and corresponding clutches (odd clutch and/or even clutch) respectively, and an auxiliary transmission actuation mechanism 200 which actuates the power transmission unit 10 when at least one of the hydraulic dual clutch unit 10D of the power transmission unit 10 and a hydraulic system of the vehicle is not functioning, wherein the transmission control mechanism 100 for the multi-speed transmission unit 10T is provided with Z-gate sequential gear shift pattern.

Abstract: Transmission control mechanism 100 in a power transmission system of a vehicle a transmission shift lever 102, a shifter arm 106, an input ratchet shifting assembly 108, an input shift ratchet and cam assembly 110, a drive shaft 112, a plurality of keys 113, a driven shaft 114, a coupler 115, a driven shaft drive gear 116, a driven shaft driven gear 118, a plurality of rail shifting means 120, a plurality of bushes 121, a plurality of rail shifter support members 122, a plurality of pawl assemblies 124, a plurality of pawl kicker means 126, a lever position control valve assembly 136, an active detent control valve assembly 138, a detent control valve assembly 140, a clutch selection control valve assembly 142, a gear shift lever position valve lever 144 and a master clutch control valve assembly 100M.

Abstract: Transmission control mechanism 100 in a power transmission system of a vehicle a transmission shift lever 102, a shifter arm 106, an input ratchet shifting assembly 108, an input shift ratchet and cam assembly 110, a drive shaft 112, a plurality of keys 113, a driven shaft 114, a coupler 115, a driven shaft drive gear 116, a driven shaft driven gear 118, a plurality of rail shifting means 120, a plurality of bushes 121, a plurality of rail shifter support members 122, a plurality of pawl assemblies 124, a plurality of pawl kicker means 126, a lever position control valve assembly 136, an active detent control valve assembly 138, a detent control valve assembly 140, a clutch selection control valve assembly 142, a gear shift lever position valve lever 144 and a master clutch control valve assembly 100M.