Workbook, Heavy Duty Truck Systems, 6E
Chapter Twenty-Seven – Answer Key
1. Technician A says that cast spoke wheels tend to produce more wheel alignment
problems than disc wheels. Technician B says that DOT data shows that disc wheels
produce more wheel-off incidents than cast spoke. Who is correct?
2. Technician A says that some disc wheels are lug- and stud mounted. Technician B says
that stud pilot mount wheels are less common today due to the greater mounting safety of
hub pilot mounts. Who is correct?
3. Technician A says that all cast spoke wheels have left-hand thread studs. Technician B
says that stud-piloted mounts thread in a direction opposite to wheel rotation. Who is
correct?
4. From the following images, identify the dual stud piloted fastener.
5. Technician A says that steel disc wheels can handle higher payloads than aluminum disc.
Technician B says that because cast spoke wheels can handle more abuse than disc
wheels, they are often used on rough terrain vocational trucks. Who is correct?
6. Radial and bias ply tires differ in their:
7. What is the greatest allowable diameter variation permitted in a set of dual tires?
8. When a wheel bearing is described as being “wet,” it is lubricated by:
d. silicone
9. What type of seal is shown in Figure 27–1?
10. Technician A uses a Tempilstick crayon and an oxyacetylene torch to remove bearing
cups from an aluminum wheel hub. Technician B uses a thermostat-controlled oven to
remove races from aluminum hubs. Who is correct?