WALMART MAINTENANCE Preventive Maintenance 4 — Questions and Answers
Question 1: A PM task requires checking the air filter on a compressor. The filter appears gray and slightly clogged but is not yet at the replacement interval. What should the technician do?
- Replace it immediately regardless of interval
- Clean it per manufacturer instructions and document the condition (Correct answer)
- Leave it unchanged and note nothing
- Spray compressed air from the inside outward to clean it
Correct answer: Clean it per manufacturer instructions and document the condition
A filter that is dirty but not at replacement interval should be cleaned per the manufacturer's method and the condition documented to track degradation.
Question 2: Which of the following best describes 'condition-based' preventive maintenance?
- Maintenance performed on a fixed calendar schedule regardless of equipment state
- Maintenance triggered by actual equipment condition indicators such as vibration or temperature (Correct answer)
- Maintenance done only after a breakdown occurs
- Maintenance scheduled by the original equipment manufacturer alone
Correct answer: Maintenance triggered by actual equipment condition indicators such as vibration or temperature
Condition-based PM uses real-time indicators like vibration analysis or temperature trends to trigger maintenance when the equipment actually needs it.
Question 3: When tightening fasteners during PM on a piece of retail equipment, why is a torque wrench preferred over a standard wrench?
- It tightens faster
- It prevents over-tightening that can strip threads or crack housings (Correct answer)
- It is required by OSHA for all maintenance tasks
- It automatically applies thread-locking compound
Correct answer: It prevents over-tightening that can strip threads or crack housings
A torque wrench applies the exact specified torque, preventing both under-tightening (loose fasteners) and over-tightening (stripped threads or cracked components).
Question 4: What is the primary purpose of keeping a detailed PM log for each piece of equipment?
- To satisfy OSHA paperwork requirements only
- To track maintenance history and identify recurring failure patterns (Correct answer)
- To show customers the store maintains its equipment
- To calculate employee overtime hours
Correct answer: To track maintenance history and identify recurring failure patterns
Detailed PM logs create an equipment history that helps identify recurring problems, justify part replacements, and refine maintenance intervals.
Question 5: During PM on a refrigeration unit, a technician finds the condenser coils heavily coated with dust and debris. What is the immediate risk if this is not corrected?
- The compressor will overheat due to reduced heat dissipation (Correct answer)
- The refrigerant will leak out faster
- The evaporator coils will freeze over immediately
- The electrical panel will trip a breaker
Correct answer: The compressor will overheat due to reduced heat dissipation
Dirty condenser coils cannot release heat efficiently, causing the compressor to run hotter and longer, risking overheating and early compressor failure.
Question 6: An electric pallet jack battery was added to the PM checklist item 'check electrolyte level.' Which safety step must precede opening the battery cells?
- Discharge the battery to zero volts first
- Wear acid-resistant gloves and eye protection (Correct answer)
- Remove the battery from the truck and place on a metal workbench
- Connect a charger to maintain voltage during inspection
Correct answer: Wear acid-resistant gloves and eye protection
Battery electrolyte (sulfuric acid) is corrosive — proper PPE including acid-resistant gloves and eye protection must be worn before opening any cell cap.
Question 7: A floor scrubber's squeegee blade is leaving water streaks after each pass. This is identified during PM. What is the most likely root cause?
- The solution tank is overfilled
- The squeegee blade is worn, cracked, or installed with the wrong edge down (Correct answer)
- The brush pressure is set too high
- The recovery tank is full
Correct answer: The squeegee blade is worn, cracked, or installed with the wrong edge down
A worn, cracked, or improperly installed squeegee blade cannot form a proper seal against the floor, leaving water streaks with each pass.
WALMART MAINTENANCE Preventive Maintenance 4
A PM task requires checking the air filter on a compressor.
The filter appears gray and slightly clogged but is not yet at the replacement interval.
What should the technician do?