New Holland Workmaster 25S, Руководство оператора

Страница: 129 / 208

6 - WORKING OPERATIONS
General field operation
Hydraulic Power Lift (HPL) - Operation
The rear three-point-hitch is the implement lift and lower system built into the rear of the tractor. The rear three-
point-hitch uses hydraulic power to allow the operator to effortlessly raise and lower heavy attachments with precision
control. The rear three-point-hitch can be used to raise and lower three point hitch equipment, and the mid mount
mower deck.
NOTE: Please see chapter 3 - CONTROLS AND INSTRUMENTS starting on page 3-1 if you are not familiar with the
controls in the operating guidelines below.
The operator has the following inputs to control the rear three-point-hitch.
• Rear three-point-hitch lever
• Rear three-point-hitch drop rate control valve
• Mid-mount mower deck height adjustment knob
Keep the engine speed at a minimum of 1500 RPM when using the rear three-point-hitch.
To raise an implement with the rear three-point-hitch move the rear three-point-hitch lever to the rear. Once the
desired height it achieved release the rear three-point-hitch lever. The rear three-point-hitch lever is self centering.
That means the rear three-point-hitch lever will return to the neutral position once the rear three-point-hitch lever is
released.
NOTE: The engine speed has a direct impact on the speed in which the rear three-point-hitch can raise. Increase the
engine speed to increase the speed the rear three-point-hitch can raise an implement.
To lower an implement with the rear three-point-hitch move the rear three-point-hitch lever forward. Once the desired
height it achieved release the rear three-point-hitch lever.
The rear three-point-hitch drop rate control valve controls how fast an implement will drop when the rear three-point-
hitch lever is in the forward position. To increase the speed of a lowering implement, turn the rear three-point-hitch
drop rate control valve clockwise as viewed from the rear of the tractor. To decrease the speed of a lowering imple-
ment, turn the rear three-point-hitch drop rate control valve counter-clockwise as viewed from the rear of the tractor.
If you close the rear three-point-hitch drop rate control valve by turning the knob completely counter-clockwise the
implement will not lower regardless if the rear three-point-hitch lever is in the forward position. The implement will be
able to raise if the rear three-point-hitch drop rate control valve is in the closed position.
The rear three-point-hitch drop rate control valve should be adjusted based on the weight of the attached implement.
If a heavy implement is mounted to the three point hitch the rear three-point-hitch drop rate control valve should be
adjusted so the implement can be lowered with precision, not lowered uncontrollably. If a light implement is mounted
to the three point hitch the rear three-point-hitch drop rate control valve can be adjusted so a quicker lower can be
achieved. The final adjustment of the rear three-point-hitch drop rate control valve should be done to meet personal
preference and match the operation being performed.
The mid-mount mower deck height adjustment knob sets the cutting height of the mower deck. The mid-mount mower
deck height adjustment knob mechanically locks the mower deck linkage to a specific height and is independent of the
three point hitch linkage. The mid-mount mower deck height adjustment knob can only be adjusted when the mower
deck is in the fully raised position. Please refer to the mid-mount mower deck Operator’s manual for more information
on setting the cutting height of the mid-mount mower deck.
6-9