SPRING 4V8256 - Caterpillar

Illustration 1 g01344296
(1) Clutch 1 (2) Clutch 2 (3) Clutch 3 (4) Clutch 4 (5) Clutch 5 (6) Clutch 6 (7) Input shaftThe planetary transmission has eight forward speeds and one reverse speed. REVERSE and FIRST use only torque converter drive. At lower ground speeds, FIRST speed and SECOND speed use torque converter drive. As the ground speed increases in SECOND speed, the lockup clutch of the torque converter engages. This providesSECOND speed with direct drive. The torque converter is always in direct drive for speeds Second through EIGHTH.Table 1 shows the clutches that are engaged for each speed.
Table 1
Speed Selection    
Speed    Engaged Clutches    
REVERSE speed     3 and 6    
NEUTRAL     6    
FIRST speed     4 and 6    
SECOND speed     1 and 6    
THIRD speed     1 and 4    
FOURTH speed     1 and 5    
FIFTH speed     1 and 3    
SIXTH speed     1 and 2    
SEVENTH speed     2 and 3    
EIGHTH SPEED     2 and 5    
Table 2
Planetary Gear Ratios    
Gear    Ratios    
1F     5.73    
2F     3.57    
3F     2.72    
4F     1.95    
5F     1.43    
6F     1.00    
7F     0.74    
8F     0.63    
1R     -4.46    
Overall     9.10    The planetary transmission consists of two rotating clutches, four stationary clutches, and four planetary units. This provides eight forward speeds and one reverse speed. No. 1 clutch (1) and No. 2 clutch (2) are the rotating clutches.The planetary transmission is bolted to the housing for the torque converter. Input shaft (7) for the planetary transmission is splined to the torque converter.
Illustration 2 g01352663
(8) Sensor (Input speeed) (9) Sensor (Out speed) (9) Sensor (Temperature) (10) Electronic Control ModuleSensor (8) measures the input speed for the planetary transmission. The sensor sends the transmission input speed to the ECM (Electronic Control Module). Sensor (8) measures the output speed of the planetary transmission. The sensor sends the transmission output speed to the ECM (Electronic Control Module).