What is a cable-controlled Lift-O-Matic mechanism?
Cable-controlled Lift-O-Matik is the mechanical arrangement that lifts the hitch without disturbing the setting lever and returns it to the same depth.
Lift-O-Matik is the quick lift arrangement that raises the three-point hitch on a tractor without disturbing the setting lever and brings it back down to the same depth. On the "cable-controlled" type this function is triggered by a steel cable that runs inside a sheath to the control mechanism: pull the cable and the hitch rises to the transport position, release it and it returns to the depth set by the main lever. Electronic retrofit kits take over precisely the outer end of that cable.
What the mechanism is for
On classic tractors the position lever sets the height of the hitch. Moving the lever every time to raise the implement at the headland and then trying to find the same depth again is a waste of time, and the depth drifts a little on every pass. Lift-O-Matik solves this: a separate quick lift lever takes the arms up, and when it is released they return to the depth set by the main lever. The arrangement therefore does not stand in for position control; it is a shortcut riding on top of it.
The mechanism is entirely mechanical. When the cable is pulled the valve moves to the lift position, and when the cable is released the system returns to its previous position. It needs only a few centimetres of movement and a limited force to work; that is why the retrofit kits can do the same job with a small DC motor.
Why the cable is the only interface
The Lift-O-Matik cable is the only point on the mechanism that can be reached from outside. The end of the cable outside the tractor is connected to the kit's cable entry socket; the kit makes the same pull with a DC motor when the switch in the cab is pressed. The LFT20 applies 60 mm and the LFT54 50 mm of pull. There is no intervention in the hydraulic line, the valve or the three-point hitch — which is why the conversion does not change the original hydraulic system.
Those two figures are also what determines compatibility. If the trigger travel of the mechanism is greater than the kit's pull travel, the movement is not completed; if the force required is above the force the kit produces, the motor is strained. In both cases the answer is not a bigger kit but putting the condition of the cable and its sheath right first: as the friction falls, both the force needed and the stroke lost come down.
Which tractors do not have this arrangement
Not every tractor has a cable-controlled quick lift. If the control mechanism is driven by a direct rod linkage or by an electronic control unit, there is no cable to pull either; the kits that attach to a cable are not applied on those machines. On tractors with electronic hitch control the lifting is already managed from buttons in the cab, so the conversion gains you nothing. Make and model are not what decides; what decides is whether the mechanism is triggered by a cable.
One rule of use applies here too: do not force the lever beyond the transport position into the continuous pumping sector. In that sector the relief valve opens constantly and the oil heats up.
What to do in practice
To find out whether your tractor has this arrangement, follow the linkage going to the quick lift lever: if you see a steel cable inside a sheath, you have the cable-controlled type. Pull the cable by hand and measure at what distance the mechanism triggers; the measurement has to fall within the kit's pull travel. If the cable binds or the sheath is crushed, carry out mechanical maintenance before the conversion — the kit does not correct the cable's own defects.
The full topic: What is Lift-O-Matic and how does it work?