MEOC Maintenance & Inspection 2 — Questions and Answers
Question 1: When inspecting the undercarriage of a mini excavator, which component should be checked for proper tension?
- Track chain/belt (Correct answer)
- Boom cylinder rod
- Swing motor housing
- Fuel filter canister
Correct answer: Track chain/belt
Track tension must be checked regularly because improper tension causes accelerated wear, derailment, or drivetrain damage.
Question 2: A mechanic notices the swing bearing on a mini excavator has excessive play. What is the safest immediate action?
- Continue light-duty work only
- Tag the machine out of service and notify a supervisor (Correct answer)
- Apply grease and monitor during operation
- Reduce swing speed and complete the shift
Correct answer: Tag the machine out of service and notify a supervisor
Excessive swing bearing play is a structural safety hazard that requires the machine to be taken out of service until repaired.
Question 3: Which fluid level should be checked BEFORE starting a mini excavator each day?
- Transmission fluid only
- Engine oil, hydraulic fluid, and coolant (Correct answer)
- Hydraulic fluid only
- Coolant and windshield washer fluid
Correct answer: Engine oil, hydraulic fluid, and coolant
Pre-shift inspections require checking engine oil, hydraulic fluid, and coolant to prevent equipment damage during operation.
Question 4: What does a milky or foamy appearance in the hydraulic reservoir indicate?
- Normal aeration from recent operation
- Water contamination in the hydraulic fluid (Correct answer)
- Overfilled reservoir
- Additive breakdown from heat
Correct answer: Water contamination in the hydraulic fluid
A milky or foamy appearance indicates water has entered the hydraulic system, which degrades performance and causes corrosion.
Question 5: How often should the engine air filter on a mini excavator typically be inspected in dusty conditions?
- Monthly
- Every 500 hours only
- Daily or as indicated by the restriction indicator (Correct answer)
- Every 250 hours
Correct answer: Daily or as indicated by the restriction indicator
In dusty environments, air filters can clog rapidly and should be checked daily or whenever the restriction indicator signals a clogged filter.
Question 6: Which of the following is a sign that a mini excavator's cooling system needs immediate attention?
- Temperature gauge reading in the normal range
- Coolant level slightly above the MIN mark
- Steam or coolant leaking from the engine compartment (Correct answer)
- Fan belt showing minor surface cracking
Correct answer: Steam or coolant leaking from the engine compartment
Steam or visible coolant leaks indicate an active cooling system failure that can cause engine overheating and severe damage if not stopped immediately.
Question 7: When greasing a mini excavator's bucket pins and bushings, what indicates the grease point has received enough lubrication?
- The grease gun pressure drops to zero
- Fresh grease purges out around the joint (Correct answer)
- The fitting accepts five full strokes
- The pin stops squeaking immediately
Correct answer: Fresh grease purges out around the joint
Fresh grease purging out around the joint indicates that old contaminated grease has been displaced and the fitting is fully lubricated.
MEOC Maintenance & Inspection 2
When inspecting the undercarriage of a mini excavator, which component should be checked for proper tension?