PLUG AS. 2232408 - Caterpillar

Illustration 1 g03866256
Transmission Hydraulic Control (Side View)
(1) Solenoids
(2) Selector valve group
(3) Top manifold
(4) Selector and pressure control valve
(5) Plate
(6) Cover The transmission hydraulic control controls the oil pressure to the torque converter, to the transmission clutches, and to the lubrication circuits. The transmission hydraulic control also controls the flow of oil to the clutches. The transmission hydraulic control is installed on the top of the transmission planetary group. The control consists of the following components:
Solenoids (1)
Selector valve group (2)
Top manifold (3)
Selector and pressure control valve (4)
Plate (5)The speed selector spool for second speed is behind cover (6).
Illustration 2 g03866393
Transmission Hydraulic Control (Top View and Side View)
(7) Oil tube for inlet from pump
(8) Oil tube for outlet to torque converter
(9) P1 pressure tap
(10) P2 pressure tap
(11) Plug for load piston
(12) Number 3 clutch solenoid
(13) Number 4 clutch solenoid
(14) Number 5 clutch solenoid
(15) Number 1 clutch solenoid
(16) Number 2 clutch solenoid Inlet oil for the operation of the hydraulic control flows from the transmission oil filters. This oil flows through tube (7) to the selector and pressure control valve.Oil for the operation of the torque converter flows through tube (8) and through an oil line to the torque converter.The clutch solenoids direct pump oil to the ends of the selector spools. The selector spools move in order to send oil to the clutch causing the clutch to engage.
Illustration 3 g03866349
Transmission Hydraulic Control (Bottom View)
(2) Selector valve group
(17) Passage to Number 4 clutch
(18) Passage to Number 2 clutch
(19) Passage to Number 1 clutch
(20) Passage to Number 3 clutch
(21) Passage to Number 5 clutch Oil to the clutches is sent through openings (17), (18), (19), (20), and (21) in the selector valve group. The selector valve group is attached to the top of the planetary group.
Illustration 4 g03866627
Selector and pressure control valve group and selector valve group
(2) Selector valve group
(4) Selector and pressure control valve group
(22) Modulation relief valve
(23) First speed and third speed selection spool
(24) Second speed selection spool
(25) Converter inlet ratio valve
(26) Direction selection spool
(27) Pressure differential valve
(28) Load piston The selector and pressure control valve group and the selector valve group are inside the top cover of the transmission.Selector spools (23), (24), and (26) are moved when oil pressure is applied to one end of the spool. Each solenoid controls the oil pressure to the end of one spool. If no pressure is going to the end of a spool, then that end is opened to the drain. The power train ECM activates the solenoids in order to control the speed of the transmission and the direction of the transmission.
Table 1
Valve Function
(22) Modulation relief valve Controls the maximum pressure in the system
(23) First speed and third speed selection spool Directs oil to the Number 3 clutch or to the Number 5 clutch
(24) Second speed selection spool Directs oil to the Number 4 clutch
(25) Converter inlet ratio valve Limits the maximum pressure to the torque converter
(26) Direction selection spool Directs oil to a direction clutch
(27) Pressure differential valve Keeps a pressure differential between the