Lift Quadrant (Quadrant Lever)
A control lever arrangement beside the seat that moves over a spring-steel spring. Every angle of the lever on the quadrant corresponds to a particular linkage position: at one end the arms go fully down, brought towards the middle they rise, and in the bend of the quadrant lies the transport position.
The quadrant is a mechanical reference scale. By bringing the lever back to the same notch, the operator finds the same working height again; that is why marking the quadrant is a common habit in the field. The end of the quadrant, however, is the continuous pumping sector and is not used.
- The tension of the quadrant spring prevents the lever from sliding on its own; if it has slackened, the lever shifts during work.
- On most tractors the friction adjustment of the lever is made with a nut.
- The distances along the quadrant are not linear; a small angle can create a large height difference.
This is the range of movement the electronic retrofit kits take as their reference. The LFT20 and LFT54 pull the fast-lift cable of the quadrant system and move the lever within the usable range; the stroke is 60 mm on the LFT20 and 50 mm on the LFT54. If your tractor has no quadrant and cable arrangement, these kits do not apply.
Context in which this term is used: Converting a tractor hydraulic lever to electronic control