Buhler 535 User Manual
Page 89
3-60
435/485/535
Forward/Reverse Shifting
The automatic modulation feature of the 407 Twindisc
Powershift transmission allows the transmission to be
shuttled from a pre-selected forward gear (st through
7th gear) to R using the control lever . Shuttling the
control lever back to forward will return the tractor to
the pre-selected gear up to 7th gear .
It is not necessary to come to a complete stop for this
shuttle shifting operation .
Section 3 - Operation
Transmission Operation
The 407 Twindisc Powershift transmission is
operated by a single control lever () . Because the
transmission has only one control lever, it is extremely
easy to use .
NOTE: The control lever is equipped with a neutral
lock button (2). The control lever may only be moved
to the forward or reverse positions if the neutral lock
button on the control lever knob is depressed. Neutral
may be selected without depressing the neutral lock
button.
The control lever is used to select forward or reverse
travel and to change transmission speeds . Move
the lever forward for forward travel and rearward for
reverse travel .
IMPORTANT: Shifting the transmission at low throttle
setting and a light draft load will extend clutch life.
The control lever is also used to make instantaneous
upward or downward gear ratio changes . Nudge the
lever to the right for upward changes and to the left for
downward changes . (In this context, “nudge” means
move the lever and then release .)
Consecutive gear ratio changes may be made, either
by nudging the lever several times or by holding the
lever to the left or right and allowing the transmission
to shift through the gear ratios automatically .
NOTE: Reverse gears are displayed as Rl and R2.
Automatic Range Select
Depressing the clutch pedal while the tractor is moving
causes a neutral condition, allowing the electronic
control to automatically select a transmission range
matching tractor ground and engine speeds when the
clutch pedal is released . For example, if the tractor is
in ninth gear forward and the operator depresses the
clutch pedal, tractor ground speed will be reduced but
engine RPM will remain the same . The transmission
controller will sense the reduction in ground speed
and automatically shift the transmission down to a
gear that will match the ground speed when the clutch
pedal is released .
If the clutch pedal is held down and the tractor comes
to a rolling stop, the transmission controller will shift
the tractor to first gear .
The transmission will not shift to neutral unless the
control lever is put in the neutral position.
F3-65
(SET)
OFF
CRU
ISE
N
F
M
R
2
1