 | |
| Illustration 1 | g01258741 |
Actual gear indicator schematic | |
The components of the actual gear indicator circuit are the Power Train Electronic Control Module (Power Train ECM), the Caterpillar Monitoring System ECM, the speedometer/tachometer module, the autoshift control switch (STIC steering), the transmission control (STIC steering), and the transmission solenoids.
 | |
| Illustration 2 | g01226164 |
(1) Power Train ECM | |
 | |
| Illustration 3 | g01226166 |
(2) Caterpillar Monitoring System ECM (behind display) | |
With the key start switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker 14 to Power Train ECM (1) and via circuit breaker 13 to Caterpillar Monitoring System ECM (2) and to speedometer/tachometer module (3).
 | |
| Illustration 4 | g01226170 |
(3) Speedometer/tachometer module (4) Actual gear indicator | |
 | |
| Illustration 5 | g01226174 |
(5) Autoshift control switch (STIC steering) (6) MANUAL position (7) AUTOMATIC position | |
 | |
| Illustration 6 | g01226172 |
(8) Transmission control (STIC steering) (9) Upshift switch (10) Downshift switch (11) Transmission direction control switch | |
When STIC steering autoshift control switch (5) is in MANUAL position (6), Power Train ECM (1) receives a signal from transmission direction control switch (11) for the direction that is currently selected. Upshift switch (9) and downshift switch (10) determine the gears that are currently selected. The signal is sent to Caterpillar Monitoring System ECM (2) via the CAT Data Link, this is sent to speedometer/tachometer module (3). Speedometer/tachometer module (3) will display the actual gear in the display window. Actual gear indicator (4) displays the gear that is currently selected by Power Train ECM (1). Power Train ECM (1) will energize the transmission solenoids as required.
When STIC steering autoshift control switch (5) is in AUTOMATIC position (7), Power Train ECM (1) receives a signal from transmission direction control switch (11) for the direction that is currently selected. Power Train ECM (1) will change gears within the transmission automatically. The gear that is currently selected in the AUTOMATIC position, will be displayed on actual gear indicator (4) .
ReferenceFor more information on the actual gear indicator system refer to Systems Operation, Testing and Adjusting, Caterpillar Monitoring System.