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SafetyProduct

A fifth wheel and kingpin provide the link between the semi-trailer/combination and truck tractor. Ensuring that the correct fifth wheel and kingpin have been selected for the application is just a part of the safety equation. What about the quality of the mounting bolts that are used to secure the fifth wheel to the truck chassis?

According to Jost SA's Manie Roux, "our range of fifth wheels and kingpins have been tried and tested throughout Africa and indeed the rest of the world, but this proven security is reduced to nothing when the wrong procedures are followed when securing fifth wheels to the truck chassis."

Shear madness
Costly accidents and loss of human life occur, says Roux, "because the incorrect number and grade of mounting bolts on both fifth wheels and kingpins are being used. Incorrect mounting procedures where the pedestal is not supported by at least 66% are all too frequent, not to mention the use of incorrect bolts types and the absence of shear blocks."

In a recent incident where a semi-trailer detached from the truck tractor it was found that bolts of the incorrect grade (strength) and the incorrect number of bolts was used to mount the base plate and fifth wheel to the truck chassis, adds Roux. "This resulted in the base plate mounting bolts shearing off causing the semi-trailer to roll over when the driver negotiated a sharp turn. The damage to the semi-trailer was extensive. Fortunately neither the driver nor any other road user sustained any injuries."

Bottom line
They may look innocuous but these bolts need to be of the best quality. Roux sums it up: "Is the cost of a pirate part where R10 or R20 is saved worth the cost of an accident where lives and millions of rands could be lost?"

Basic Mainenance for Kingpins

Kingpin and 5th wheel maintenance are non-negotiable if truckers want to deliver loads safely. Trailer equipment distributor, TSE Big Max helps promote truck and trailer safety by distributing valuable tips to its customers via a monthly newsletter. The diagram above shows that by using a measuring gauge, transporters can easily determine the wear on a kingpin, ensuring replacement before it’s too late. A similar gauge is also available for 5th wheel rubbing plates.