FILM-INSTRUCTION 1884143 - Caterpillar

Illustration 9 g06266331
(1) Maximum Output (Downshift)
(2) Minimum Output (Upshift)
(3) Forward
(4) Neutral
(5) Reverse
Illustration 10 g06266316
Transmission control group layout. Refer to Table 3.
(B) Transmission Control Group
Table 3
Transmission Control Connector Layout
Pin location Wire Number Output Description
1 G763 NEUTRAL Switch
2 A273 Ground
3 G750 FORWARD Switch
4 G755 REVERSE Switch
5 F783 UPSHIFT (Normally Closed)
6 F785 UPSHIFT (Normally Closed)
7 F784 DOWNSHIFT (Normally Closed)
8 E746 DOWNSHIFT (Normally Closed) Upshift
Press left button to signal the ECM to upshift the transmission one gear.Downshift
Press the right button to signal the ECM to downshift the transmission one gear.
Table 4
Left Joystick Thumb Switch Status
Position
Left button (1) Minimal Output (Upshift) Minimal PWM Output 20%+-3%
No button pushed (2) Nominal Output Nominal PWM Output 50%+-3%
Right button (3) Maximum Output (Downshift) Maximum PWM Output 80%+-3% Direction
The direction switch has three positions.
forward (6)
neutral (5)
reverse (4)The operator selects the direction of the transmission through the switch.
Table 5
Switch Status
Travel Direction Reverse (4) Neutral (5) Forward (6)
Reverse Closed Open Open
Neutral Open Closed Open
Forward Open Open Closed
Table 6
Signal 1 and 2 PWM Output
Position
Forward (6) 80% - 91% Duty Cycle Outputs
The ECM responds to decisions by sending electrical signals through the various outputs. The outputs create an action or the outputs provide information.Solenoids
Transmission Clutch Solenoids
Illustration 11 g01237747The solenoids engage the speed clutches and direction clutches in the transmission.Note: Do not apply direct battery voltage to the solenoids. The solenoids are not designed for operating with 24 VDC.Input/Output
The CAT data link is used to communicate with other electronic control modules on the machine. The data link is bidirectional. The ECM can send information and the ECM can receive information. The data link allows the sharing of information with other electronic control modules.An example of data link communication would be engine speed information that is sent by the engine ECM to the power train ECM. The ECM also exchanges diagnostic information with the Caterpillar Monitoring System.A module identifier (MID) is assigned to all electronic control modules that use the data link. The MID for the power train ECM is 081.Data Link
Cat Data Link
The Cat Data Link is an input/output of the ECM. The data link uses the connector for the service port to communicate with the Caterpillar Electronic Technician. A data link connection is provided for the product link.Note: The control for the product link provides a global positioning system for the machine.The data link is bidirectional. The bidirectional link allows the ECM to input information and output information. The data link consists of the following parts: internal ECM circuits, the related harness wiring, the service tool connector, and the connector for the product link. The Cat Data Link connects to the ECM at contact J1-10 (wire 893-GN(Green)) and contact J1-20 (wire 892-BR(Brown)).
The ECM receives commands from the Cat ET to change the operating modes. The Cat ET will read the service codes that are stored in the memory of the ECM. The Cat ET will clear the service codes that are stored in the memory of the ECM.
The ECM sends the input and the output information to the Caterpillar ET.Note: An electronic control module that