Jost
Lubricate the kingpin lock using a hand pump grease gun through the grease zerk on the skirt of the fifth wheel; see Fig.. Apply a light oil to all moving parts. For sliding fifth wheels spray diesel fuel on the slide path of the base plate.
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Jam Nut
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Adjustment Bolt
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Grease Zerk
Fig. 1, Jost Fifth Wheel
Notice: Do not use a power grease gun. The pressure will damage the lube line.
If the fifth wheel is not equipped with low-lube plates, apply a lithium-based grease with extreme pressure (EP) additive to the trailer contact surface of the fifth wheel.
Note: If the fifth wheel is equipped with low-lube plates, the top plate only requires lubrication at the new product break-in stage. The low-lube plates require no further lubrication.