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IN FOCUS HOW THE JOST SYSTEM WORKS
Page 46
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The Jost system aims to allow the driver to "operate all functions of coupling and decoupling" from the cab "with the press of a button". To achieve this requires an interface for pneumatic and electrical connections, which is Jost's speciality. The German manufacturer makes a range of coupling sensors, sliding, low-profile and selflubricating fifth wheels, powered landing legs, drawbar connections and steered rear axles.
The KKS system uses sensors to locate
plug-in systems immediately next to the king pin and fifth wheel. These ensure they line up and engage properly, even on uneven ground or at angles at up to 100-degrees variance from a straight line. As a bonus, the legs wind themselves, instead of a tired driver, up (and down). On the tractor this plug outlet is below the fifth wheel coupling, the matching inlet on the trailer is a wedgeshaped device directly behind the kingpin.
To enable the driver to monitor their function there's an easy-read display panel, audio and visual warnings in the cab. Best of all, since full fleet implementation is likely to take years, trucks and trailers can be simultaneously equipped to operate with standard couplings; both systems working in parallel to enable non KKS-equipped kit to be used. The trailer brake still has to be released manually — drivers should be doing safety check walk rounds anyway— but later versions of KKS may incorporate this function.