Valtra T144 Operator's Manual page 236

T series
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3. Operation
4. Align the pick-up hitch hook or drawbar pin to the eye of the trailer/implement
beam.
5. Press the symbol side of the lifting/lowering switch or the lifting push button
until the hitch latches.
You can hear a click and the trailer hitch release lever jumps a little.
6. Press the lifting/lowering switch side opposite to the symbol or the lowering
push button to lower the linkage slightly.
Ensure that the hitch is supported by the latch and does not lower with the
linkage.
7. Pull the lever of the auxiliary hydraulic valve 1 to retract the towing device.
The hydraulic extension locks, and you can hear a click when the hitch
latches in longitudinal direction.
8. Ensure that the towing device extension is locked.
Push and pull the lever of the auxiliary hydraulic valve 1 several times to
ensure that the hydraulic extension is fully locked and does not extend.
9. Ensure that the towing device is fully locked.
The towing device is fully locked when the following conditions are fulfilled
simultaneously:
10. Check the linkage position.
IMPORTANT: Adjust the linkage so that it does not hit the towed device or
power take-off shaft at any circumstance.
WARNING: When using a trailer, make sure that the hitch latch is
locked.
WARNING: Make sure that the locking makes the click sound
because only this tells that the hydraulic extension is locked. If it
does not make the sound, it is possible that the extension is not
locked.
The towing device is in the upmost position and supported by the latch.
The locking position of the pick-up hitch in longitudinal direction has been
checked by attempting to move the extension back and forth.
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