Workbook, Heavy Duty Truck Systems, 6E
Chapter Four – Answer Key
1. Which of the following trailer chassis systems topped the list of maintenance concerns of
fleet managers?
2. On which of the following documents does the truck driver have input to preventive
maintenance inspections?
3. Which of the following words is used in trucking to mean the same thing as out-of-
service (OOS)?
4. Which of the following would represent the OOS specification for a fifth wheel pivot pin
and bracket?
5. Which of the following describes an OOS tire specification?
6. Which type of diesel engine oil classification would conform to OEM service
requirements for a four-stroke cycle engine equipped with a diesel particulate filter?
7. Which of the following gear lube classifications would be appropriate for use in most
OEM differential carrier assemblies?
8. Which of the following acronyms refers to types of antifreeze?
9. Which of the following devices would represent the heaviest load on a chassis electrical
system when running?
10. Which of the following terms correctly describes a standard grease fitting?