Heavy Duty Truck Systems – Preventative Maintenance – Answers & Review
Guide
Technician A places his finger over the breather hole when greasing a propeller shaft slip spline.
Technician B says that to properly grease 5th wheel pivot pins when a tractor is coupled to a
trailer, the weight on the 5th wheel should be relieved by cranking up the dolly legs. Who is
correct? - ✔✔Both A and B
What is the minimum tread depth permitted on any two adjacent tread grooves before a truck
tire should be classified OOS? - ✔✔2/32 inch
When a spring pin fails to take grease and you know the zerk fitting to be functional, which of
the following should you do first? - ✔✔Remove the weight from the spring
When checking the lube level in a differential carrier housing, which of the following would
indicate that the oil level is correct? - ✔✔oil is exactly level with the fill hole when cold
Which of the following may help prevent air system components from freezing in cold
temperature conditions? - ✔✔methyl alcohol
Which of the following types of PMI would require the most detailed inspection and service
routine? - ✔✔Schedule C
Which of the following would result when a diesel fuel is cooled to its cloud point? - ✔✔forms
wax crystals that can plug filters
Which of type of antifreeze mixture contains zero water? - ✔✔WEC
Guide
Technician A places his finger over the breather hole when greasing a propeller shaft slip spline.
Technician B says that to properly grease 5th wheel pivot pins when a tractor is coupled to a
trailer, the weight on the 5th wheel should be relieved by cranking up the dolly legs. Who is
correct? - ✔✔Both A and B
What is the minimum tread depth permitted on any two adjacent tread grooves before a truck
tire should be classified OOS? - ✔✔2/32 inch
When a spring pin fails to take grease and you know the zerk fitting to be functional, which of
the following should you do first? - ✔✔Remove the weight from the spring
When checking the lube level in a differential carrier housing, which of the following would
indicate that the oil level is correct? - ✔✔oil is exactly level with the fill hole when cold
Which of the following may help prevent air system components from freezing in cold
temperature conditions? - ✔✔methyl alcohol
Which of the following types of PMI would require the most detailed inspection and service
routine? - ✔✔Schedule C
Which of the following would result when a diesel fuel is cooled to its cloud point? - ✔✔forms
wax crystals that can plug filters
Which of type of antifreeze mixture contains zero water? - ✔✔WEC
