HUB-CLUTCH 6Y3849 - Caterpillar

Fourth Speed Forward
Refer to Illustration 2 for a typical example of power flow in the forward direction.When the transmission is in fourth speed forward, the Number 2 clutch and the Number 3 clutch are engaged. The Number 2 clutch holds ring gear (5) for the Number 2 clutch stationary. The Number 3 clutch holds ring gear (8) for the Number 3 clutch stationary. Input shaft (23) turns Number 2 sun gear (3). The Number 2 sun gear turns Number 2 planetary gears (25).Because ring gear (5) is held stationary by the Number 2 clutch, planetary gears (25) move around the inside circumference of the ring gear. The movement of planetary gears (25) causes Number 2 carrier and Number 3 carrier (6) to turn in the same direction as input shaft (23).Ring gear (8) is held stationary by the Number 3 clutch. Because the ring gear is stationary, the movement of Number 2 carrier and Number 3 carrier (6) causes Number 3 planetary gears (27) to move around the inside circumference of the ring gear. The Number 3 planetary gears turn output shaft (22). From the output shaft, power flows through the output transfer gears to the differentials.First Speed Reverse
Illustration 3 g00880099
Transmission Components
(1) Coupling
(2) Number 1 clutch
(3) Number 2 sun gear
(4) Number 2 clutch
(5) Ring gear for Number 2 clutch
(6) Number 2 and Number 3 carrier
(7) Number 3 clutch
(8) Ring gear for Number 3 clutch
(9) Number 4 carrier
(10) Number 4 sun gear
(11) Number 4 clutch
(12) Ring gear for Number 4 clutch
(13) Number 5 clutch
(14) Rotating hub
(15) Number 6 clutch
(16) Ring gear for Number 6 clutch
(17) Ring gear for Number 1 clutch
(18) Number 6 planetary gears
(19) Number 1 carrier
(20) Number 6 carrier
(21) Number 1 sun gear
(22) Output shaft
(23) Input shaft
(24) Number 1 planetary gears
(25) Number 2 planetary gears
(26) Number 3 sun gears
(27) Number 3 planetary gears
(28) Number 4 planetary gears
(29) Housing Assembly
(30) Number 6 sun gearWhen the transmission is in first speed reverse, the Number 1 clutch and the Number 6 clutch are engaged. The Number 1 clutch holds coupling (1) for the Number 1 clutch stationary. The Number 6 clutch holds ring gear (16) for the Number 6 clutch stationary. Input shaft (23) turns Number 1 sun gear (21). The Number 1 sun gear turns Number 1 planetary gears (24). Number 1 carrier (19) has a direct mechanical connection with coupling (1).Because coupling (1) is held stationary by the Number 1 clutch, Number 1 carrier (19) is also held stationary. The movement of Number 1 planetary gears (24) causes ring gear (17) to turn in the opposite direction of input shaft (23). Ring gear (17) has a direct mechanical connection with Number 2 carrier and Number 3 carrier (6).As the Number 2 carrier and the Number 3 carrier turn, Number 3 planetary gears (27) turn. The Number 3 planetary gears turn ring gear (8) for the Number 3 clutch and for output shaft (22). Ring gear (8) turns Number 4 carrier (9). As the Number 4 carrier turns, Number 4