PISTON 1932445 - Caterpillar

Brief Summary of Operation
For additional information on the operation of the machine, refer to Operation and Maintenance Manual, SEBU8718 and Service Manual, UENR1122.
The transmission speed sensor magnetically measures the transmission speed.
The control for the electronic programmable transmission determines the proper moment for shifting. The control uses signals from the transmission speed sensor and the shift lever switch to determine the moment for shifting. 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. The connection exists 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 are 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