KUHN GMD883, Operators Manual And Installation Manual, Page: 54 / 88

Disc mower
52
GMD883
Instructions for work
Ground pressure
The suspension of the mowing units is obtained by 4
hydro-pneumatic accumulators.By modifying the
pressure in the accumulators, the ground pressure of
the mowing units is altered.
The hydro-pneumatic accumulator system also operates
the "safety breakback " function.
In case an obstacle is struck:
• The suspension pressure increases in order to
decrease the ground pressure.
• The mowing units can pivot up to 25° rearwards and
upwards.
• Once the obstacle is passed, the mowing unit
automatically regains its initial position.
To check the ground pressure:
- Place the machine in working position.
- Check that the chassis height is correct
H = 600 mm (2’).
- Check pressure indicated on gauges:
• NORMAL operating pressure = 70 bar (1015 psi).
• MINIMUM operating pressure = 55 bar (798 psi).
• MAXIMUM operating pressure = 85 bar (1233 psi).
The ground pressure adjustment determins the
safety breakback adjustment.
Example: when the pressure in the gauges
increases, the ground pressure of the mowing
units decreases and the breakback force
increases.
In case an obstacle has been struck, check
that the mowing unit has not been damaged.
The pressure must be adapted to the nature and
moisture degree of the ground.
Never adjust machine to a pressure not
comprized between these limit values.