Breakaway Protection - McConnel PA7070T Operator's Manual

BREAKAWAY PROTECTION

The machine is equipped with a hydraulic breakaway device offering 50° of breakback; this
protects the structure of the machine should an unforeseen obstacle be encountered.
Breakaway may occur momentarily during normal work should an extra thick or dense
patch of vegetation be encountered. In these instances tractor forward motion may be
maintained with care.
Where breakaway has occurred as a result of contacting a post or tree etc. the tractor
must be halted and the controls of the machine utilised to manoeuvre the head away from
the obstacle. Never continue forward motion to drag the head around the obstacle in
breakback position.
A) With 'AUTO RESET' selected:
When the slew relief valve setting is exceeded oil is displaced from the slew ram into the
base of the lift ram which causes the head to rise as the arm pivots backwards to clear the
obstruction.
Resetting of the head into the work position occurs automatically.
B) With 'SLEW' selected:
When the slew relief valve setting is exceeded oil is displaced from the slew ram allowing
the arm to pivot backwards horizontally and the obstacle to be cleared.
Re-setting the head into the work position is carried out manually by selecting 'slew out' on
the control assembly
The machines breakaway function does not relieve the operator
of his responsibility to drive carefully; always be alert and avoid
obvious hazards before contact occurs.
The forces required to activate the breakaway system will vary
dependent upon the gradient of work; it will require less force
when working uphill and vice versa.
A
B
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