“For sliding fifth wheels, spray diesel fuel on the slide path of the base plate.” “Lubricate the kingpin lock using a hand pump grease gun through the grease zerk provided on the skirt of the fifth wheel and apply grease to the trailer contact surface as well as a light oil to all moving parts,” he says. It’s important to perform all fifth wheel maintenance with the tractor uncoupled from the trailer, Burie notes. The kingpin should not move back and forth in a locked fifth wheel.” “A properly adjusted fifth wheel should allow the kingpin to pivot freely. “Also check for proper lock adjustment,” Burie adds. Then inspect the bracket pin bolts and make sure the locking tabs properly secure the bolts in place. “First, inspect the mounting,” he says, “and repair or replace any missing or damaged fasteners and broken components. Justin Burie in the warranty department at JOST International also recommends that a certified technician inspect fifth wheel assemblies every three months or 30,000 miles. Proper lubrication procedures include removing old grease and debris from all fifth wheel-to-trailer contact surfaces and applying new water-resistant lithium-based grease. Routine periodic maintenance and lubrication recommendations for fifth wheels from SAF-Holland include lubricating locking mechanisms every three months or 30,000 miles and thoroughly cleaning the locking mechanism every six months or 60,000 miles. “Also, each fifth wheel has its own characteristics so it is important that proper training procedures are reviewed with technicians to ensure the fifth wheel is being properly maintained.” “The kingpin and upper coupler of the trailer should be maintained to the proper dimensions of the kingpin, ensuring that they are within specifications and that any deflection or wear is within out of service criteria,” Nissen continues.
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