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3-59
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.
F3-77
GEAR
Section 3 - Operation
Transmission Operation