Workbook, Heavy Duty Truck Systems, 6E
Chapter Twenty-Four – Answer Key
1. Technician A says that API GL-5 lubricant is generally recommended for most current
heavy-duty truck drive axles. Technician B says that most OEMs recommend oil
additives if the objective is to extend service life. Who is correct?
2. What is the recommended gear lube viscosity for differential carriers when operated in
severe winter conditions in which temperatures drop to −30°F (−34°C)?
3. A gear shaft that shears, producing a star-shaped fracture pattern, has most likely been
subjected to which of the following overloads?
4. What is the function of a thrust screw and thrust block?
5. Where is a spigot bearing located?
6. Technician A says that most heavy-duty power dividers can only be removed after the
differential carrier assembly has been pulled from the banjo housing. Technician B says
that a power divider should measure 0.003–0.007 inch (0.076–0.178 mm) of endplay
after installation. Who is correct?
7. Which of the following would be the most likely maximum ring gear runout
specification?
8. Technician A removes ring gear rivets with a hammer and chisel. Technician B drills
through the rivet before driving it out with a punch. Who is correct?
9. A differential carrier produces noise on turns only. Which of the following would be the
most likely cause?
10. When checking lube level in a differential carrier, where should the oil level be?