3C8441 SWITCH Caterpillar parts
Rating:
Alternative (cross code) number:
CA3C8441
3C-8441
3C8441
CA3C8441
3C-8441
3C8441
Weight: 0.90 pounds 0 kg.
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Information:
transmission ECM controls the transmission shift points. The basic components and corresponding requirements for shifting of the transmission are listed below:Transmission Shift Control - The ECM must know the desired gear position. The transmission shift control provides a ground signal. The ground signal varies with the gear that has been selected.Transmission Gear Switch - The ECM must know the transmission gear that is currently engaged.Transmission Output Speed Sensor (TOS) - The ECM must know the output speed of the transmission. One TOS sensor tells the ECM the speed of the transmission output shaft. The TOS sensor provides this information.Torque Converter Output Speed Sensor - The ECM must know the output speed of the torque converter. One speed sensor provides the information to the ECM regarding the speed of the torque converter. Upshift Solenoid and Downshift Solenoid - The ECM must electrically shift the transmission. The ECM uses two separate outputs to the solenoids in order to shift the transmission. The transmission is always shifted one gear at a time. The ECM activates the solenoids electrically in order to shift the transmission.The items that follow are exceptions.
Do not attempt to shift from a forward gear to PARK if the speed of the transmission output shaft is moving faster than 1500 rpm. The ECM will not shift the transmission into PARK until the speed of the transmission output shaft is less than 1500 rpm. This prevents damage to the clutches and discs which could lead to early transmission failure.
The ECM does not downshift when the operator selects a speed that is not appropriate for the current TOS. Automatic upshifting and/or downshifting will continue when the TOS decreases to the downshift point. The transmission gear and the selected gear will remain same. The selected gear now becomes the new top gear.
The ECM shifts the transmission up one gear above the selected gear if the TOS reaches a critical value. This helps protect the engine from overspeed. If the transmission is already in top gear, the lockup clutch is deactivated. The transmission ECM also controls the start relay.Note: All events regarding engine overspeed are recorded and available for examination. The examination of these events requires the use of the proper service tool. See the topic in System Operation, "Tattletale Function".Note: Also see the topic in System Operation, "Additional Functions".Four events are logged in the ECM.
Transmission abuse
Coasting in neutral
Engine overspeed
Machine overspeed
Do not attempt to shift from a forward gear to PARK if the speed of the transmission output shaft is moving faster than 1500 rpm. The ECM will not shift the transmission into PARK until the speed of the transmission output shaft is less than 1500 rpm. This prevents damage to the clutches and discs which could lead to early transmission failure.
The ECM does not downshift when the operator selects a speed that is not appropriate for the current TOS. Automatic upshifting and/or downshifting will continue when the TOS decreases to the downshift point. The transmission gear and the selected gear will remain same. The selected gear now becomes the new top gear.
The ECM shifts the transmission up one gear above the selected gear if the TOS reaches a critical value. This helps protect the engine from overspeed. If the transmission is already in top gear, the lockup clutch is deactivated. The transmission ECM also controls the start relay.Note: All events regarding engine overspeed are recorded and available for examination. The examination of these events requires the use of the proper service tool. See the topic in System Operation, "Tattletale Function".Note: Also see the topic in System Operation, "Additional Functions".Four events are logged in the ECM.
Transmission abuse
Coasting in neutral
Engine overspeed
Machine overspeed