SEAL-LIP TYPE 2200201 - Caterpillar

Illustration 1 g01250814
Basic diagram for the power train systemBrief Summary of Operation
The transmission speed sensor magnetically measures the transmission speed.
The control for the electronic programmable transmission determines the proper moment for shifting by using the signals from the transmission speed sensor and the shift lever switch. The electronic programmable transmission activates the solenoids in order to make shifts.
The Cat data link connects the Chassis Electronic Control Module (Chassis ECM) with automatic electronic traction aid and the Monitoring System so the input from the transmission speed sensor can be shared.
The body raise switch prevents any reverse operation of the transmission during the raise operation of the body. The hoist control position sensor also prevents any reverse operation of the transmission during the lowering operation of the body. The body up sensor will signal the limiting function on the gears. This limits the speed of the machine while the body is up.
The switch for the parking and secondary brake and the retarder and service brake switch send input signals to the Chassis 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 the retarder switch is activated, the Chassis ECM will allow rapid speed shifts.
The shift lever switch selects desired speed and direction.
The Chassis ECM will energize pairs of solenoids on the clutch modulating valves for the transmission. 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 modulating valve for the torque converter lockup clutch is activated, pressure oil is sent to the torque converter lockup clutch. This oil engages the lockup clutch of the torque converter for direct drive.
The Chassis ECM uses the Caterpillar Data Link to communicate with the Monitoring System. The Monitoring System informs the operator of the transmission gear that is actually engaged.General Description
Note: For additional information on the electrical system, refer to Service Manual, " 773F, 775F, and 777F Power Train ECM".The power train consists of four basic systems. The following systems are the four basic systems:
Chassis Electronic Control Module (Chassis ECM)
Torque Converter
Transfer Gears and Transmission
Differential and Final DrivesThe four basic systems are connected by an electrical connection, a hydraulic connection, a magnetic connection, or a mechanical connection.The operation of the power train begins at the Chassis Electronic Control Module (Chassis ECM). The Chassis ECM receives the information of the selected operating speed from the shift lever switch in the electrical system. The Chassis ECM uses the information from the switches and the sensors in the electrical system to control the hydraulic system of the torque converter and transmission. This is done by energizing the appropriate solenoids on the modulating valves for the transmission clutches.These modulating valves for the transmission clutches engage the correct transmission clutches. This mechanically connects the