Proportional Ground Speed Power Take-Off - Valtra T144 Operator's Manual

• Deactivate the automatic start/stop in any of the following ways:
• Press the button for rear PTO automatic start/stop.
• Use the switch for rear PTO.
• Keep the linkage raised, that is, in the standby position for at least 90
seconds.
The automatic start/stop is also deactivated if the driving speed at the
moment of lowering the linkage is outside the speed limits 1–25 km/h. When
the automatic start/stop is deactivated, the button is not lit.
3.17.2.8

Proportional ground speed power take-off

The proportional ground speed power take-off (PTO) is optional.
The proportional ground speed PTO is primarily used in the A and B speed
ranges. The proportional ground speed PTO is designed for the highest torque
values of the speed ranges A and B. In speed ranges C and D, the driving speed
easily exceeds the shaft's maximum rotating speed. In this case, the automatics
actively limit the driving speed to 15 km/h. The engine speed sets to idle until the
driving speed has decreased below the limit. A faster rotating speed could
damage the propeller shaft between tractor and implement. The trailer should be
equipped with a means of disconnecting the drive from the trailer.
IMPORTANT: Do not use the creeper gear together with the proportional ground
speed PTO to increase traction force. There is a risk of damage to the
transmission.
IMPORTANT: If the ground speed power take-off is activated and the PTO speed
exceeds 1800 rpm, the buzzer alarms and message "SLOW DOWN, PTO
SPEED TOO HIGH!" is shown on the instrument panel display. If this occurs,
immediately decrease the rpm to prevent damage to the rotating parts of the
PTO.
When the proportional ground speed PTO is activated, the maximum speed is
limited to 15 km/h.
The proportional ground speed PTO can be engaged if the driving speed is 2
km/h or less. There is no speed limit for disengaging the ground speed PTO.
Before using a trailer with a powered axle, make sure that the drive is compatible
with the PTO of the tractor. The speed of the trailer should be 0-3% lower than
driving speed of the tractor.
For heavy proportional use it is recommended to use the 1¾" (45 mm) shaft.
You can engage the ground speed PTO by turning the speed control knob to the
GSPTO position and activate it by pressing the switch for rear PTO.
The activation and deactivation of the ground speed PTO is indicated in the
proline instrument panel.
CAUTION: When using the proportional ground speed PTO, the speed
of the PTO shaft varies according to the transmission speed of the
tractor. When the tractor is reversed, the PTO shaft also rotates in the
reverse direction.
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3. Operation