Fifth Wheels A B 1 1 2 2 3 3 5 07/11/2000 f310841 4 A. Closed Position, Locked B. Open Position, Unlocked 1. Release Handle and Spring 2. Adjustment Nut 3. Lock Halves 4. Lock Pivot 5. Sliding Yoke Fig. 11.2, Type B Kingpin Lock Mechanism (bottom view) 2. The kingpin lock mechanism must be fully open, and the fifth wheel plate must be completely lubri- cated with chassis grease. For lubrication instruc- tions, refer to Group 31 of the Cargo Maintenance Manual. fifth wheel could cause erratic steering and loss of vehicle control, possibly resulting in serious per- sonal injury or death. 3.
Position the tractor so that the fifth wheel lock opening is in line (both vertically and horizontally) with the trailer kingpin. To prevent a false lockup, the kingpin should be in a position to enter the WARNING Keep the fifth wheel plate lubricated to prevent binding between the tractor and trailer. A binding 11.2