Normal Operation
The Machine ECM receives the requested speed and direction from the FNR Shift Handle - Autoshift via Cat Data Link.
The Machine ECM will direct the operation of the solenoids on the transmission after the following prerequisites are established
- The shift lever is communicating to the Machine ECM.
- The Machine ECM has received the gear information.
The output of the Machine ECM to the transmission is determined on the status of the following inputs:
- Auto/Manual Switch
- Neutral Lock Switch
- Shift lever control module - FNR Autoshift
- Neutralizer/Downshift Switch
- Parking Brake Switch
- Ride Control Switch
The Autoshift transmission is controlled by a twist handle. The handle is located on the shift lever. The Autoshift twist handle has four positions.
High Speed Directional Shift
No precaution is taken when the direction is shifted by the Autoshift transmission control. If you shift from the fifth gear forward to the third gear reverse, the transmission will shift to third gear reverse.
Power Up
When the Machine ECM is energized, the transmission is placed in neutral. The transmission is placed in neutral regardless of the position of the shift lever. The shift lever must pass through NEUTRAL before the machine is able to move.
Neutral Start
The signal for the start relay passes through the shift lever. The shift lever must be in NEUTRAL to allow cranking of the engine. The lever must pass through NEUTRAL before a direction can be selected.
Modes of Operation
The FNR Shift Handle - Autoshift has an automatic shift mode and a manual shift mode.
Ride Control
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| Illustration 1 | g01443531 |
Ride control circuit | |
A three-position switch controls the ride control function. In the held middle OFF position, the ride control function is disabled. In the ON position, the ride control solenoid is enabled. In the held AUTO position, the ride control function activates the ride control solenoid valve when the ground speed is greater than a set limit. The ride control solenoid valve is deactivated when the machine ground speed is at least 1 km/h less than the set speed limit. The default set limit for the AUTO position is 9 km/h. AVSpare Electronic Technician (ET) will be used to change the set limit. ground speed is calculated with a nominal tire radius of 635 mm (25 inch). A pressure switch is placed in series with the ride control relay that controls the ride control solenoid. When pressure is applied to the rod end of the lift cylinder, the circuit of the solenoid driver is open. The ride control function cannot be engaged when pressure is applied to the rod end of the lift cylinder.
Parking Brake
The parking brake uses the following components:
- Machine Electronic Control Module
- Parking Brake Switch
- Parking Brake Indicator
The parking brake switch alerts the Machine ECM of the status of the parking brake. The brake can be applied or the brake can be released.
The machine will remain in neutral under the following conditions:
- The parking brake is applied and the machine is placed in gear.
- The machine is in gear and the parking brake is applied.
The shift lever must be shifted back to the NEUTRAL position and the parking brake released in order to resume normal operation.
The Drive Through Operation of the Parking Brake:
1 - The parking brake is applied and the shift lever is in the NEUTRAL position.
2 - Shift the machine into gear.
3 - shift the machine back into the NEUTRAL position.
4 - Within 3 seconds, shift the machine back into gear.
The in−gear relay will energize. A parking brake abuse event will be logged in the control module. Releasing the parking brake will silence the alarm. The machine in normal operation. The alarm is also silenced when the machine is in neutral.
Transmission Auto/Manual Switch
The Transmission auto/manual switch supplies two inputs to the Machine ECM. The inputs are used in order to select the automatic shift function or the manual shift function of the FNR Shift Handle - Autoshift. The switch has diagnostic capabilities.
When auto/manual input "auto" is to ground and auto/manual input "man" is open, the automatic mode is selected. When auto/manual input "auto" is open and auto/manual input "man" is to ground, the manual mode is selected.
If the inputs are identical (both open or both ground) for a minimum of 5 seconds, a diagnostic fault is logged. The machine will default to the manual shift function. When the Auto/Manual switch is used, the shift lever does not need to pass through the NEUTRAL position.
Neutral Lock
When the neutral lock switch is depressed the machine held in neutral. The switch signals the transmission control to ignore position of the shift lever. Depressing the switch signals the Machine ECM to ignore the shift lever. All of the transmission solenoids remain inactive.
The neutral lock uses the following components:
- Machine ECM
- Neutral Lock Switch
If the neutral lock switch is depressed and the machine is in gear, the control module will immediately shift the machine into neutral. The transmission will remain in neutral until the shift lever is returned to the NEUTRAL position and the neutral lock is turned off.
When the neutral lock switch is closed to ground, the transmission is placed in neutral regardless of the state of the shift lever. The transmission will remain in neutral until the neutral lock switch is opened and the shift lever is placed in neutral. After the shift lever is placed in neutral, the lever can be used to place the machine in gear again.