The primary safety rule to follow when using an accumulator circuit is always have the accumulator ____ before removing it from the circuit.

The primary safety rule to follow when using an accumulator circuit is always have the accumulator ____ before removing it from the circuit.

• A. Fully discharged
• B. Isolated
• C. At ambient pressure
• D. Completely discharged

Answer: (D)

Accumulators store energy in both the hydraulic fluid and, if pressurized, the gas side. The safest rule is to completely discharge the accumulator so that all stored energy is removed before you remove it from the circuit. When the energy is gone, there’s no sudden pressure or gas release that could propel fluid or move components unexpectedly, protecting you from injury and preventing spills. Merely isolating the accumulator or leaving it at ambient pressure does not guarantee zero stored energy—the pressure can remain in the trapped fluid or gas and could re-energize the circuit if valves are disturbed. Fully discharged and completely discharged describe the same goal, but the wording here emphasizes zero residual pressure.

Accumulators store energy in both the hydraulic fluid and, if pressurized, the gas side. The safest rule is to completely discharge the accumulator so that all stored energy is removed before you remove it from the circuit. When the energy is gone, there’s no sudden pressure or gas release that could propel fluid or move components unexpectedly, protecting you from injury and preventing spills. Merely isolating the accumulator or leaving it at ambient pressure does not guarantee zero stored energy—the pressure can remain in the trapped fluid or gas and could re-energize the circuit if valves are disturbed. Fully discharged and completely discharged describe the same goal, but the wording here emphasizes zero residual pressure.