The TRIDEC steering system type TF is a mechanical steering system used on trailers with swivel axles, making a low floor height possible. Low loaders, for example. A TF system enables you to steer 1 to 3 swivel axles mechanically, possibly in combination with 1 or more rigid axles. The system is primarily used on semi-trailers with a gooseneck, but can also be used on flat trailers.

The system consists of a fifth wheel plate (which replaces the usual fifth wheel) and one or more axle units, which are connected to one another by the steering rods. The TF fifth wheel plate has a king pin and a steering wedge that are automatically locked in the fifth wheel on the prime mover when the trailer is hitched. When the prime mover is turned, the turntable plate in the fifth wheel plate turns with it via the steering wedge thanks to the fixed connection. The steering rod transmits the steering motion via the bearing journal at the top of the turntable plate to a transfer lever, from where two steering rods operate the transfer lever on the axle unit. Track rods run from the transfer lever on the axle unit to the track rod arms on the swivel axle. If several axles need to be steered, the steering motion is transmitted from the rear axle to the axles in front by means of rods.

The steering and track rods consist of one part and are fastened at the front and back by steering ball joints. Thanks to this solid connection, the steering motion is transmitted very directly and there is no play on the system. This connection also ensures that the axle cannot be steered in any way other than by the motion of the prime mover. This means that rutting and other external factors do not adversely affect the vehicle's stability.

The TRIDEC TF system is a low-maintenance system. Maintenance is limited to lubricating the turntables a few times a year and testing the bolt connections. This is possible because high-quality materials and a durable construction are used. The steering rod bearings patented by TRIDEC, for instance, are entirely maintenance-free, thereby lengthening the trailer's service life. The turntables are sealed by a special seal. In addition, all lubricating points are centralised at a single, easily accessible point.

Thanks to a unique patented design of the fifth wheel plate and the axle mounting frame, the entire system can easily be removed from below. This saves you a great deal of time during service and renders a floor hatch in the bodywork unnecessary. All TRIDEC products are custom-built, though because standard components are used wherever possible in our systems spare parts are always available.

TRIDEC has an advanced engineering department which is responsible for the entire technical preparation and processing of your order. By means of specially developed software, a turning circle calculation can be made that simulates the road behaviour of your trailer when cornering. Interference checks and construction recommendations provide you with a customised system for your chassis. This gives you a system with the perfect combination between optimum steering and maximum reduction of friction.


Gümaş Otomotiv Sanayi ve Ticaret A.Ş.
Taksim Cad. No:33/A 34437,
Taksim - İstanbul

t: 0212 254 78 05
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