3-59 Section 3 - Operation

Transmission Operation

1407 Twindisc Powershift Transmission

Operation

The 1407 Twindisc Powershift transmission gears are constantly in mesh.. Gear shifting is done by the use of eight electronically controlled hydraulic clutches in the transmission..

There are twelve forward speeds and two reverse speeds..

Clutch selection is controlled by electric solenoid valves which direct hydraulic oil to the required clutches.. When the operator selects a gear, an electronically controlled shift system activates the solenoids required for the specified gear..

The clutch pedal is used to modulate pressure to the master clutch allowing the operator to feather engagement to any of the first seven forward gears or first reverse gear.. Use of the clutch pedal allows for safe, accurate positioning of the tractor when hitching up implements or operating in confined spaces.. Optimum inching control, particularly with heavy loads, is best achieved in lower gears and by reducing engine RPM..

The transmission controller has built-in error codes which may appear on the display of the tractor.. Refer to “Transmission Troubleshooting” in Section 5 for an explanation and possible causes of the error codes..

Transmission Shifting

When the tractor is started, the transmission display module will display N3 showing that the shifter is in neutral position and that it is the default 3rd gear selection.. Depressing the clutch pedal with the tractor stationary will automatically change the transmission to the first gear setting.. By shifting the shift lever forward the transmission automatically will go to any gear selected from 1st to 7th gears..

NOTE: When gears 4 thru 7 are selected, the programming starts the tractor in 3rd gear and automatically shifts up to the pre-selected gear.

GEAR

F3-77

435/485/535