SHAKAERATOR - Operator Manual - McConnel

Breakback Protection SystemsThere are 2 types of breakback protection systems available for the GrasslandShakaerator; these are Mechanical Breakback or Auto-Reset Breakback.NOTE: Early Auto-Reset machines utilised hydraulic accumulators and rams to providebreakback - from late 2010 onwards this system is superseded by self-contained gasstruts.Mechanical Breakback SystemThis system works on a shear bar method wherea contact force with an object in excess of ameasured limit will shear the locking bar of theleg allowing it freedom to pivot backwards andupwards, thus protecting major components fromdamage. Each shear bar has a total of 4 ‘lives’before a replacement will be required.The ‘4 Lives’ Shear Bar (Part No. 22520.54)NOTE: It is important when replacing shear bars that genuine McConnel replacements (Part No. 22520.54) areused as these are specially designed to shear under a pre-determined force. Use of non-genuine parts willrisk expensive damage to the machine and/or tractor. Under no circumstances should the shear bolt bereplaced by a bolt or a metal rod.Hydraulic Auto-Reset Breakback System (EarlyMachines)This system provides protection via hydraulic rams andaccumulators; each leg is held in the work position by ahydraulic ram pressurized by pre-charged accumulators.When an object is struck producing a force in excess of ameasured limit, the oil in the rams is forced back into theaccumulators allowing the leg to breakback. Once theobstruction has been passed the accumulators will return theoil to re-pressurize the ram which then automatically returnsthe leg into the work position.DANGER! Keep clear of hydraulic legs when they arein the breakback position, residual pressure in thesystem may cause them to move without warning.28