HOUSING-FILTER 3165384 - Caterpillar

Brief Summary of Operation
The shift lever switch selects the desired speed and direction.
The transmission speed sensor magnetically measures the transmission speed.
The Power Train ECM determines the proper moment for shifting by using the signals from the transmission speed sensor, the shift lever switch, and the transmission gear switch. The Power Train ECM activates the solenoids in order to make shifts.
The hoist control position sensor prevents any reverse operation of the transmission during the raise operation of the dump body. The hoist control position sensor also prevents any reverse operation of the transmission during the lowering operation of the dump body. The dump body position sensor will signal the limiting function on the gears. This limits the speed of the machine while the dump body is up.
The switch for the parking and secondary brake and the retarder and service brake switch send input signals to the Power Train ECM. When the secondary parking brake switch or the retarder and service brake switch are activated, the anti-hunt timer is deactivated. When the service brake and retarder switch is activated, the Power Train ECM will allow rapid speed shifts.
When an upshift solenoid or a downshift solenoid is activated, pressure oil is sent to the rotary actuator. The rotary actuator turns the rotary selector spool. This sequence causes the correct pair of clutches to be engaged for the next desired speed.
The transmission hydraulic control will individually control the maximum pressure in each clutch. The transmission hydraulic control will individually modulate each clutch in order to control the fill time and the release time.
When the lockup clutch solenoid is activated, pressure oil is sent to the modulation reduction valve of the lockup clutch valve. This oil engages the lockup clutch of the torque converter for direct drive.
The transmission gear switch tells the Power Train ECM the engaged gear of the transmission. The transmission gear switch is mechanically turned by the rotary selector spool.
The Power Train ECM uses the Caterpillar Data Link to communicate with the Vital Information Management System (VIMS). The VIMS informs the operator of the transmission gear that is actually engaged. The VIMS also monitors the lockup clutch and the transmission clutches for clutch slippage.