Preventive Maintenance and Inspection Flashcards
7 cards from real 310T practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Preventive Maintenance and Inspection flashcards as text
What is the minimum tread depth required on front (steer axle) tires of a commercial vehicle per FMCSA regulations?
Answer: 4/32 inch
FMCSA requires a minimum of 4/32 inch tread depth on steer axle tires, which is higher than the 2/32 inch minimum for drive or trailer axle tires.
Which fluids should be inspected as standard practice during a preventive maintenance service on a heavy-duty truck?
Answer: Engine oil, coolant, transmission fluid, power steering fluid, and brake fluid
A thorough PM service requires checking all fluid levels — engine oil, coolant, transmission, power steering, and brake fluid — to detect early loss or contamination.
What is the primary function of an air filter restriction indicator on a diesel engine?
Answer: To warn when air filter restriction has reached its service limit
The restriction indicator signals when the pressure drop across the air filter exceeds acceptable limits, indicating the filter must be replaced.
Under FMCSA 49 CFR Part 396.17, how often must a commercial motor vehicle undergo a periodic inspection?
Answer: At least once every 12 months
FMCSA requires commercial motor vehicles to be inspected at least once every 12 months to verify they meet minimum safety standards.
What does a PM-A service interval typically include on a heavy-duty commercial truck?
Answer: Oil and oil filter change plus a basic visual inspection
PM-A is the most frequent service interval and covers an oil and filter change along with a general visual inspection of key components.
What is the correct procedure for verifying a fifth wheel is properly coupled during a pre-trip inspection?
Answer: Attempt to pull forward against the locked kingpin (tug test) to confirm the latch is secure
A tug test — pulling forward while the kingpin is locked — physically confirms that the fifth wheel latch is fully engaged and will not release under load.
When should wheel bearing adjustment be verified during preventive maintenance?
Answer: Per the manufacturer's PM schedule and whenever wheel-end components are disassembled
Wheel bearing adjustment must be checked on the manufacturer's prescribed schedule and any time the hub is opened for service to prevent premature failure.