793D Off-Highway Truck Power Train: Transmission Control, Speedometer/Tachometer Module (Transmission Gear Indicator) & Position Sensor (Hoist Control)

1.-Transmission Control

Transmission control

Location of the shift lever switch

Shift lever switch

Location of the transmission gear switch

Transmission gear switch in the NEUTRAL position

Except for the different pin numbers at the switch, the transmission gear switch and the shift lever switch operate similarly. Each switch is mechanically positioned with diodes that determine the current flow.

The shift lever switch provides the Power Train Electronic Control Module with information about the transmission control position. The shift lever switch is mechanically connected to the transmission control inside the shift console.

The transmission gear switch sends a signal to the Power Train Electronic Control Module. The signal indicates the transmission gear that is currently engaged. The transmission gear switch is mechanically connected to the rotary actuator of the transmission hydraulic control.

2.-Speedometer/Tachometer Module (Transmission Gear Indicator)

Location of the transmission gear indicator

Regardless of the position of the transmission control, the transmission gear indicator will display the current operating gear of the transmission. The indicator is located in the front instrument panel under the tachometer.

3.-Position Sensor (Hoist Control)

Location of the hoist control position sensor

The hoist control position sensor is located on the left side of the operator's seat. The hoist control position sensor is a Pulse Width Modulation position sensor. The hoist control postion sensor sends duty cycle signals to the Power Train Electronic Control Module (Power Train ECM).

The Power Train ECM uses these signals to energize the appropriate hoist proportioning solenoid on the hoist control valve. The hoist proportioning solenoid will move the spool in the hoist control valve. This will cause oil to be sent to the hoist cylinders in order to move the dump body.

The signal from the hoist control position sensor is also used to neutralize the transmission. The Power Train ECM will allow only a forward speed position or the NEUTRAL position when the hoist control position sensor is in the RAISE position. The Power Train ECM will not allow a shift to the REVERSE position until the hoist control position sensor has been moved from the RAISE position and the transmission shift lever is in the NEUTRAL position.

Note: If the machine is in REVERSE and the hoist position sensor is in the RAISE position the Power Train ECM will shift the transmission to NEUTRAL. The machine will remain in NEUTRAL until the hoist control is moved into the HOLD or the FLOAT position and the transmission control has been cycled through NEUTRAL.

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793D Off-Highway Truck Power Train: Transmission Control, Speedometer/Tachometer Module (Transmission Gear Indicator) & Position Sensor (Hoist Control) 2013-01-01T17:04:00-08:00 Rating: 4.5 Diposkan Oleh: Unknown