Workbook, Heavy Duty Truck Systems, 6E
Chapter Thirty-Four – Answer Key
1. Technician A says that minor cracks in a cast-steel fifth wheel deck can be repair-welded
using low-hydrogen electrodes. Technician B says that worn trailer kingpins can be built
up with weld in position on the upper coupler assembly and returned to service. Who is
correct?
2. Which type of fifth wheel would be recommended for use on a tanker trailer, double B-
train?
3. Which type of fifth wheel is capable of altering the amount of weight over a tractor bogie
assembly?
4. Which of the following is a factor in determining the fifth wheel height?
5. Which of the following is true of the angle-on-frame mount as compared to the plate
mount?
6. The correct sliding fifth wheel location should be based on:
7. Technician A says that less fore-and-aft articulation is possible as fifth wheel height
decreases. Technician B says that off-highway use will normally require a higher fifth
wheel capacity rating. Who is correct?
8. Which of the following lubricants should be used on a fifth wheel deck that requires
lubricating?
9. Technician A replaces a Holland jaw pair if wear exceeds 1⁄8 inch (3 mm) at the kingpin
bearing surface. Technician B replaces the buffing rubber, jaws, and lock if the shims
total 3⁄16 inch (4.5 mm). Who is correct?
10. When the locking plungers of an air release sliding fifth wheel will not release to fore-
and-aft movement of the assembly, Technician A checks the plungers for wear.
Technician B checks the air cylinder for proper operation. Who is correct?