Fiat 1996 Brava Service Manual page 487

Auto transmission and differential Bravo-Brava i g l ^
Components and operation
21-27.
Neutral (selector lever on position IM)
The gearbox input shaft E rotates in a clockwise direction.
The clutch C3 couples the crownwheel K1 to the clutch carrier drum D, to permit the transmission of
motion without delays or stresses, caused by the simultaneous engagement of several clutches and
brakes, when the selector lever is positioned on R or D (1st gear).
The multiple disc clutches C1 - CO - C2 and brakes B2 - B1 are disengaged, so the epicyclic gear sets
P1 and P2 do not receive motion, thus isolating the differential relay shaft U from the gearbox input
shaft E.
NOTE The parking lock is off, so the planet gears ST1 - ST2 - ST3 are free to rotate around the sun
gears S I and S2, allowing the vehicle to move if it is on a slope.
Park (selector lever on position P)
The control components are as de­
scribed for position IM, with the
sole difference that the parking
lock (ratchet P) is engaged, pre­
venting the vehicle from moving.
First gear (selector lever on posi­
tion 1)
The gearbox input shaft E rotates
in a clockwise direction.
The crownwheel K1 is coupled to
the input shaft E by the engage­
ment of the multiple disc clutch
C1, the clutch carrier drum D and
the clutch C3 (already engaged
with I M or P selected).
The clutch C3 locks the free wheel
FO. The crownwheel K2 is locked
to the gearbox casing by the en­
gagement of the multiple disc
brake B2. The brake B2 locks the
free wheel F 1 . The planet gears
ST1, driven by the crownwheel
K1 of the epicyclic gear set P I , ro­
tate in a clockwise direction and
via the sun gears S1 and S2
transmit motion, reduced and in a
clockwise direction, to the planet
gears ST2 of the epicyclical gear
set P2.
The planet gears ST3, driven by
the planet gears ST2, rotate in an
anti-clockwise direction and, by
the reaction on the locked crown­
wheel K2, shift and rotate in clock­
wise direction the gear train carrier
T1 and gear 11.
The gear 11 transmits motion to the
wheels via the gear 12 and the dif­
ferential relay shaft U.
NOTE Engaging the brake B1 in 1st and reverse allows the engine to brake the vehicle in deceleration.
10 Publication no. 506.670/06