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 correct procedure for disposing of used engine oil after completing a PM service?
Answer: Store it in an approved container and deliver it to a certified recycling facility
Used engine oil is a regulated hazardous waste and must be collected in approved containers and recycled through a licensed used-oil collection facility under EPA regulations.
How is engine coolant freeze protection most accurately tested during preventive maintenance?
Answer: With a refractometer or hydrometer to measure specific gravity or freeze point
A refractometer or hydrometer directly measures the antifreeze concentration, providing an accurate freeze point reading rather than an estimate.
Under FMCSA regulations, what defines an 'out-of-service' condition for a commercial motor vehicle?
Answer: A defect so severe that continued operation poses an imminent hazard to safety
An out-of-service order is issued when a defect creates an imminent safety hazard; the vehicle must not be operated until the defect is corrected.
What is checked during a slack adjuster inspection on an S-cam drum brake system?
Answer: Adjustment arm travel distance and proper manual or automatic adjustment function
Slack adjusters control the stroke of the brake chamber push rod; verifying arm travel and correct auto-adjustment confirms brakes will apply within the allowable stroke limit.
When performing PM on a truck's diesel particulate filter (DPF), what maintenance task is periodically required beyond normal passive regeneration?
Answer: Forced active regeneration or physical ash cleaning of the DPF
Ash from engine oil additives accumulates in the DPF and cannot be burned off during normal regeneration, requiring periodic forced regen cycles or physical removal and cleaning.
What is the correct source for wheel-end fastener torque values when reinstalling hubs or wheels during PM?
Answer: The vehicle or axle manufacturer's torque specification
Manufacturer torque specifications ensure correct clamping force that prevents both wheel loosening from under-torque and stud damage from over-torque.
Which condition found during a battery inspection indicates the battery must be replaced?
Answer: Case swelling, a cracked housing, or capacity below 80% on a load test
Physical damage such as swelling or cracking, or a load test result below 80% of rated capacity, indicates the battery cannot reliably deliver adequate power and must be replaced.