TRANSMISSION ARRANGEMENT 3P1750 - Caterpillar

Fourth Speed Forward
Refer to Illustration 1 for the location of the components, as described below. 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 1 clutch and the Number 3 clutch are engaged. The Number 1 clutch holds coupling (1) for the Number 1 clutch stationary. The Number 3 clutch holds ring gear (9) for the Number 3 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 (2) to turn in the opposite direction of input shaft (23). Ring gear (2) has a direct mechanical connection with Number 2 carrier and Number 3 carrier (7) .Ring gear (9) is held stationary by the Number 3 clutch. Because the ring gear is stationary, the movement of Number 2 carrier and Number 3 carrier (7) causes Number 3 planetary gears (26) to move around the inside 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 g01210375
Power Flow in First Speed Reverse (4) Number 2 sun gear (5) Number 2 clutch (6) Ring gear for Number 2 clutch (7) Number 2 and Number 3 carrier (9) Ring gear for Number 3 clutch (10) Number 4 carrier (11) Number 4 sun gear (13) Ring gear for Number 4 clutch (14) Number 5 clutch (15) Rotating hub (part of sun gear (11) ) (16) Number 6 clutch (17) Ring gear for Number 6 clutch (18) Number 6 carrier (20) Number 6 sun gear (22) Output shaft (23) Input gear and shaft (25) Number 2 planetary gears (26) Number 3 planetary gears (27) Number 4 planetary gears (28) Housing assembly (29) Number 6 planetary gearsWhen the transmission is in first speed reverse, the Number 6 clutch and the Number 2 clutch are engaged. The Number 2 clutch holds ring gear (6) for the Number 2 clutch stationary. The Number 6 clutch holds ring gear (17) for the Number 6 clutch stationary. Input shaft (23) turns Number 2 sun gear (4). The Number 2 sun gear turns Number 2 planetary gears (25) .Because ring gear (6) is held stationary by the Number 2 clutch, planetary gears (25) move around the inside of the ring gear. The movement of planetary gears (25) causes Number 2 and Number 3 carrier (7) to turn in the same direction as input shaft (23). As the Number 2 carrier and the Number 3 carrier turn, Number 3 planetary gears (26) turn.The Number 3 planetary gears turn ring gear (9) for the Number 3 clutch and output shaft (22). Ring gear