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Page 41
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FIFTH-WHEELS
• Low-maintenance fifth-wheels Incorporate low-friction top-plates that eliminate the need for regular greasing and help make the coupling opfratIon a cleaner one for the driver Fontaine, George Fischer, Holland and Jost all sell greasefree fifth-wheels with replaceable wear pads recessed into the specially cast top plates. Jest's JSK37 low-maintenance fifth wheel has a single lubrication point on the locking jaw.
Remember, however, that low-maintenance does net mean no maintenance: the jaw-to-king pin contact area still needs a little lubrication, just like a standard fifth wheel. Otherwise, as Fontaine warns: The metal-on-metal action could destroy the trailer king pin and coupling Jaw inside six months."
Doughty Engineering is a specialist manufacturer of polythene and polyethylene liners which fit over existing top plates. Some mod els have chamfered edges to cope with frequent coupling and uncoupling, while the polyethylene material on the 5 Liners Is said to last longer than steel—Doughty says there are trucks that have covered more than 300,000 miles on a single liner.