Ovlac MINI MEDIUM H/F, Operating Instrucions And Spare Parts

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Fig.5
Fig.4 Fig.3
4. PROTECTION SYSTEMS
The Auto Reset protection systems work automatically. When
the share meets an obstacle the protection system pulls the beam
up (Fig. 3) thus avoiding the obstacle and returning to its original
position afterwards with no need to stop the tractor.
This way all the impacts produced by an uneven field are
absorbed by the protection system thus protecting all the elements
of the plough and of the tractor too.
For the same reason, the Auto Reset protections decrease
the traction effort by not making the tractor overcome every
eventual obstacle.
- SERIES MMF : Protection is achieved by means of shear bolts
(Fig.4). When the share point meets an obstacle, the shear bolt
breaks and permits the beam to rotate around its bedding. To
continue the labour, restore the beam to its original position and
replace the shearbolt.
- SERIES MMH : In order to adapt the plough to soil
hardness conditions, in the hydraulic models the release
pressure can be adjusted by means of injecting (light soils)
or removing (heavy soils) oil from the system This
operation is carried out from the cabin of the tractor by
means of the hydraulic tube with manometer supplied to
this effect (Fig. 5).
Note : The Auto Reset systems from OVLAC are
adjusted at the works at an optimal pressure for average
conditions.