YOKE AS 2V5893 - Caterpillar

Illustration 1 g02873496
(1) Modulation relief valve (2) Second and fourth speed selection spool (3) First speed and third speed selection spool (4) Selector control valve (5) Converter inlet ratio valve (6) Direction selection spool (7) Selector and pressure control valve (8) Pressure differential valve (9) Load pistonSelector and pressure control valve (7) and selector control valve (4) are inside the top cover of the transmission.Selector spools (2), (3), and (6) move when oil pressure is applied to one end of the spool. Each solenoid controls oil pressure to the end of one spool. If there is no pressure at the end of a spool, that end of the spool is open to the drain. The transmission control switches and the electronic transmission control activate solenoids to control the speed and direction of the transmission.ReferenceFor information on the selector and pressure control valve, components and function, refer to table 1.
Table 1
Components and Functions    
Component     Function    
(1) Modulation relief valve     Controls the maximum pressure in the system    
(2) Second and fourth speed selection spool     Directs oil to the Number 3 or Number 5 clutch    
(3) First speed and third speed selection spool     Directs oil to the Number 4 or Number 6 clutch    
(5) Converter inlet ratio valve     Limits the maximum pressure to the torque converter.    
(6) Direction selection spool     Directs oil to a direction clutch    
(8) Pressure differential valve     Keeps a pressure differential between the speed and direction clutches    
(9) Load piston     Controls the rate of pressure increase in the clutches