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 tool is used to measure brake lining thickness on a drum brake system during PM?
Answer: Dial caliper or purpose-built lining gauge
A dial caliper or lining gauge accurately measures the remaining friction material thickness to determine if linings are above the minimum serviceable limit.
Which components are inspected to confirm the air dryer is functioning correctly during PM?
Answer: Purge valve operation and desiccant cartridge condition
A properly functioning air dryer expels moisture through the purge valve; checking purge valve operation and the desiccant cartridge confirms it is removing water from the air system.
What does it indicate when a brake chamber push rod stroke exceeds the maximum allowable limit?
Answer: The brakes are under-adjusted or excessively worn, reducing braking effectiveness
Excess push rod stroke means the brakes require more travel to apply, indicating under-adjustment or worn linings that must be corrected immediately.
What type of lubricant is typically specified for steering knuckle king pin bushings during chassis lubrication?
Answer: NLGI No. 2 multi-purpose lithium complex grease
NLGI No. 2 lithium complex grease provides the correct consistency and extreme-pressure protection required for high-load suspension and steering pivot points.
During a belt inspection, which condition requires immediate replacement of a serpentine or V-belt?
Answer: Cracks, fraying, glazing, or missing chunks of material
Physical damage such as cracks, fraying, glazing, or missing chunks indicates the belt is near failure and could break without warning.
What information must be documented on a vehicle inspection report (VIR) to maintain a complete maintenance record?
Answer: All defects found, repairs made, parts used, technician signature, and date
A complete VIR documents every defect discovered, all corrective actions taken, parts installed, the technician's signature, and the date, creating a full auditable record.
What is the purpose of the walk-around inspection portion of a commercial vehicle preventive maintenance check?
Answer: To systematically inspect the vehicle's exterior, tires, lights, and visible undercarriage components
A structured walk-around ensures that exterior body, tires, lights, and undercarriage items visible during the circuit are checked in a consistent, repeatable sequence.