If hydraulic system pressure exceeds the safe maximum valve during an arrestment, what will occur?

If hydraulic system pressure exceeds the safe maximum valve during an arrestment, what will occur?

• A. The pressure relief valve opens, relieving excess pressure
• B. The pump stalls
• C. The shuttle valve reverses flow
• D. The system locks the brakes

Answer: (A)

When hydraulic pressure climbs above the safe maximum, a pressure relief valve opens to vent the excess fluid, keeping system pressure from rising further. This protects hoses, seals, pumps, and actuators from damage and prevents unsafe braking behavior. Once the pressure drops back to or below the valve’s set point, the relief valve closes and normal operation resumes. The other options don’t address overpressure protection: a pump stalling is a different fault condition, a shuttle valve only routes flow between sources, and a system locking the brakes would indicate a different failure mode.

When hydraulic pressure climbs above the safe maximum, a pressure relief valve opens to vent the excess fluid, keeping system pressure from rising further. This protects hoses, seals, pumps, and actuators from damage and prevents unsafe braking behavior. Once the pressure drops back to or below the valve’s set point, the relief valve closes and normal operation resumes. The other options don’t address overpressure protection: a pump stalling is a different fault condition, a shuttle valve only routes flow between sources, and a system locking the brakes would indicate a different failure mode.