Hydraulic Systems & Fluid Management Flashcards
7 cards from real MEOC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Hydraulic Systems & Fluid Management flashcards as text
What is the correct procedure for checking the hydraulic fluid level on a mini excavator?
Answer: Check on level ground with the machine in the manufacturer-specified parked position and the engine off
Fluid level checks require level ground and the machine in the specified rest position so fluid distributes correctly, and the engine off so the system is depressurized.
What is the most common cause of hydraulic fluid overheating in a mini excavator?
Answer: Continuous heavy loading, restricted fluid flow, or a blocked oil cooler
Overheating results when heat generated by system work exceeds the heat exchanger's capacity to dissipate it, often from sustained high loads or airflow blockage at the cooler.
What is the primary risk of mixing incompatible hydraulic fluid brands or types in an emergency?
Answer: Incompatible additive packages may degrade fluid performance and damage seals or internal components
Different fluid formulations contain additive packages that can react adversely when combined, leading to seal swelling, corrosion, or accelerated wear.
What does milky or cloudy hydraulic fluid indicate in a mini excavator?
Answer: Water contamination has entered and emulsified with the hydraulic fluid
Milky fluid indicates water emulsification, which reduces lubrication ability, promotes corrosion, and can cause pump cavitation.
What is the function of a hydraulic accumulator found on some mini excavators?
Answer: To store pressurized fluid for pilot control, pressure spike dampening, or brief high-demand functions
An accumulator stores pressurized fluid that maintains pilot control pressure and cushions pressure spikes, improving system response and protecting components.
How should hydraulic hoses be inspected before operating a mini excavator?
Answer: Visually check the entire hose length for cracks, abrasion, bulging, leaks, and verify fittings are secure
Pre-operation inspection of hydraulic hoses requires checking the full hose length and all fittings for any sign of wear, damage, or leakage.
What is the correct response to a high-pressure hydraulic fluid injection injury on a job site?
Answer: Seek immediate emergency medical attention — this is a life-threatening injury even if the wound looks minor
High-pressure fluid injection penetrates deep tissue and causes severe internal necrosis requiring emergency surgery; the small entry wound is misleading.