Hydraulics & Pneumatics Systems Flashcards
6 cards from real Amazon Maintenance Technician practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Hydraulics & Pneumatics Systems flashcards as text
What is the correct method to safely depressurize a hydraulic system before performing maintenance?
Answer: De-energize the power unit, cycle all actuators to neutral, and verify zero pressure on gauges
Safe depressurization requires shutting down the power unit, cycling control valves to exhaust trapped pressure, and confirming zero on pressure gauges.
Which fitting type is most resistant to vibration-induced loosening in hydraulic lines at Amazon facilities?
Answer: JIC 37-degree flare fitting
JIC 37-degree flare fittings rely on metal-to-metal contact rather than thread sealing, making them highly resistant to vibration loosening.
How is air pressure regulated for different pneumatic tools on the same compressed air line?
Answer: Using individual point-of-use pressure regulators at each tool
Point-of-use regulators allow each pneumatic tool or station to operate at its required pressure independently of other branches.
What does the ISO cleanliness code (e.g., ISO 4406 22/20/17) indicate for hydraulic fluid?
Answer: The particle count per milliliter at three different micron sizes
ISO 4406 codes specify contamination levels by reporting particle counts at 4, 6, and 14 micron sizes, helping technicians determine if filtration is adequate.
A hydraulic hose is due for replacement under a time-based program. What visual inspection should ALWAYS accompany scheduled replacement?
Answer: Inspect for abrasion, kinking, bulging, leaks, and fitting corrosion before removal
Visual inspection before removal identifies hidden damage or associated fitting wear that could indicate a systemic issue beyond simple hose age.
What is the minimum bending radius rule for hydraulic hoses to prevent internal damage?
Answer: Never bend a hose tighter than the manufacturer's specified minimum bend radius
Exceeding the manufacturer's minimum bend radius collapses the hose's inner tube, restricts flow, and causes premature failure.