Can the lift retrofit kits be used on a combine harvester, loader or construction machine?
The kits were built for cable-controlled Lift-O-Matik. The decision follows the control interface, not the machine: cable, pull travel and force limit.
These kits were developed for the cable-controlled Lift-O-Matik mechanism on a tractor. On combine harvesters, loaders and similar construction machines the control is usually by proportional joystick or by a direct mechanical or hydraulic pilot circuit; there is no cable triggering. If a cable-pulled control is present and the travel and the force fall within the kit's limits, the kit works technically — but technical suitability is not enough on its own to decide.
The decision is made by looking at the control interface, not at the machine
The three questions to ask are these:
- Is there a steel cable inside a sheath that triggers the control?
- Is the cable's trigger travel within 60 mm (LFT20) or 50 mm (LFT54)? What the cable pull distance means is what decides here.
- Is the force needed to pull the cable below 10 kg (LFT20) or 15 kg (LFT54)? Whether these forces are enough depends on the mechanism's own resistance.
The order matters: if there is no cable, the other two measurements are meaningless. And if there is a cable, do not estimate the travel and the force by eye. The resistance of the mechanism varies with spring tension, with dirt and with the friction of the cable inside its sheath; two machines of the same model can give different figures.
If the answer to all three is yes, the kit fits physically. The electrical system also has to be 12V and negative ground; on 24V machines no direct connection can be made. Trying to force it with a voltage converter is not recommended, because it changes the current and the protection behaviour.
| Control interface | Does the kit fit | Reason |
|---|---|---|
| Quick lift triggered by a steel cable in a sheath | Yes, if travel and force are within the limits | The kit takes over precisely the outer end of that cable |
| Proportional joystick and electrohydraulic valve | No | There is no cable to pull, the command is already electrical |
| Direct mechanical lever with a rod linkage | No | The kit pulls a cable, it does not push a lever |
| Hydraulic pilot circuit | No | The triggering is done by oil pressure |
| 24V electrical system | Not directly connectable | The kit is designed for a 12V supply |
The regulatory side can differ from a tractor
Important warning: On construction machinery, changes made to control devices may be assessed differently from a tractor in terms of safety and regulation. Changes falling under chassis, brakes, steering, cab, dimensions or the addition of equipment require a modification project. An application of this kind should be planned only after consulting an authorised engineer and the machine manufacturer. The standard product scope is the tractor application; the answer to whether the kit counts as a modification also varies with the class of vehicle.
The reason for the distinction is this: on a tractor the kit only changes the way an existing control device is operated, and does not touch the hydraulic circuit or the chassis. On a construction machine the same operation may affect a control device defined in the machine manufacturer's safety documentation. That is why the assessment varies from machine to machine, and the decision is read not from a product catalogue but from the machine's own technical file.
What to do in practice
Do not decide by looking at the name of the machine; open the cover and see the control mechanism. Pull the cable with your hand to find the point at which the mechanism triggers, measure the pull travel and weigh the force required with a hand scale. Those two measurements and the voltage of the electrical system give you the whole decision. If the measurements come out marginal, do not force it: a system working at the limit goes outside the limit in the cold and with a dirty cable. If you are going to apply it to a machine other than a tractor, share the measurement results with the manufacturer and settle the regulatory side in writing as well.
The full topic: Converting a tractor hydraulic lever to electronic control