| Electronic Control System Components For The Transmission | |
| (1) Transmission control | This component is controlled manually by the operator. This component controls the movement of the shift lever. |
| (2) Transmission (ECM) | This component controls all shifts of the transmission. |
| (3) Shift lever switch | This component tells the transmission control the position of the transmission shift lever. |
| (4) Transmission switch | This component tells the transmission control the gear that is engaged. |
| (5) Transmission speed sensor | This component senses the rpm of the output shaft of the transmission. The component tells the transmission control the speed of the output shaft. |
| (6) Transmission hold switch | This component prevents automatic upshifts. This component also changes the speed of the automatic downshift for the transmission control. The component checks the lights on the transmission control. |
| (7) Downshift solenoid (8) Upshift solenoid |
These components control the movement of the rotary actuator. |
| (9) Pressure control valve | This component controls the maximum pressure, and oil flow in the clutches. The component also controls the amount of pressure increase, and the time of pressure decrease in the clutches. |
| (10) Selector valve | This component controls the pressure in the hydraulic system. The selector valve also tells the pressure control valve the clutches that need to be engaged. The component also controls the torque converter inlet pressure. |
| (11) Rotary actuator | This component controls the movement of the rotary selector spool in the selector valve. |
Two different systems control the operation of the transmission. An electrical system activates the transmission hydraulic controls. The electronic control for the transmission permits manual shifts of the transmission and automatic shifts of the transmission. The operator manually moves transmission shift lever (1) in order to shift the transmission. The selection of REVERSE, NEUTRAL and FIRST speeds is done manually. The shift from FIRST speed to SECOND speed must be done manually. The selection of SECOND through EIGHTH speeds is automatic as a result of the position of transmission shift lever (1) and the rpm of the output shaft of the transmission. The electronic control system for the transmission will not permit the transmission to upshift to a speed higher than the position of the transmission shift lever. The control system will automatically downshift until SECOND speed is reached.
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| Illustration 1 | g00363762 |
Underneath Operator Compartment (2) Electronic control module (ECM) | |
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| Illustration 2 | g00489289 |
Right Side Of Seat (1) Transmission control lever (3) Shift lever switch (inside cover) | |
The transmission electrical system is made up of the following components.
- A solid-state transmission control (2)
- A transmission switch (4)
- A shift lever switch (3)
- Two solenoids that control the shift and engagement of the transmission
- A neutral start control
- A transmission speed sensor (5)
- A transmission hold control (switch) (6)
- Electrical harnesses and connectors
The neutral start control allows the tractor to start only in NEUTRAL.
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| Illustration 3 | g00363769 |
Left Side Of Tractor (4) Transmission switch (inside cover) | |
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| Illustration 4 | g00363794 |
Rear Of Tractor (5) Transmission speed sensor (inside cover) | |
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| Illustration 5 | g00489494 |
(6) Transmission hold control (switch) | |
The main component in this electrical system is the transmission control. The transmission control must get information from four sources.
- The switch for the transmission control (3)
- The transmission switch (4)
- The transmission speed sensor (5)
- The transmission hold control (switch) (6)
With the information from these components, the transmission control will send an electrical signal to the upshift solenoid (8) or downshift solenoid (7) .
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| Illustration 6 | g00363798 |
Top Of Transmission (7) Downshift solenoid (8) Upshift solenoid | |
The basic components of the transmission hydraulic controls are listed below.
- two solenoids (7) and (8)
- pressure control valve (9)
- selector valve (10)
- rotary actuator (11)
The solenoids are the connection between the electrical system and the hydraulic system. When one of the solenoids is activated electrically, oil will flow to rotary actuator (11) . The rotary actuator turns a rotary selector spool in selector valve (10) which sends pilot oil to pressure control valve (9) . Pressure control valve (9) then sends oil at the correct rate in order to smoothly engage the correct clutches in the transmission.
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| Illustration 7 | g00363879 |
Right Side Of Transmission Hydraulic Controls (7) Downshift solenoid (8) Upshift Solenoid (9) Pressure control valve (10) Selector valve (11) Rotary actuator (12) Rotary selector shaft | |
The rotary selector spool can be manually moved through all of the positions when the engine is off. Rotary selector shaft (12) is connected to the rotary selector spool. When rotary selector shaft (12) is turned, the rotary selector spool turns. When rotary selector shaft (12) is rotated all the way clockwise, rotary actuator (11) is in NEUTRAL position. From the NEUTRAL position, each detent position in the counterclockwise direction is REVERSE, FIRST, SECOND, THIRD, FOURTH, FIFTH, SIXTH, SEVENTH, and EIGHTH speeds.