GENMA Maintenance · Hydraulic System | Accumulator: Pressurized Component, Handle with Care

The accumulator may look like a small steel bottle, but it's filled with high-pressure nitrogen and hydraulic oil. Mishandling can lead to serious injury.

What it does
•    Emergency backup — provides temporary pressure if the main pump fails (e.g., lowering the boom)
•    Dampens pulsations — reduces hydraulic shocks
•    Assists fast actions — supplements flow during peak demand

Daily checks
1.    Pressure — After shutting down and relieving pressure, attach a gauge to the test port. Actual pressure should not drop below 20% of the theoretical value. If lower, replace the accumulator.
2.    Drain valve — Make sure the ball valve is in the correct position with no leaks.
3.    Visual inspection — Check for dents, rust, or weld cracks. If any, stop using it immediately.

Service intervals
•    Every 10 years, have a certified professional inspect the accumulator’s integrity.
•    If pressure is too low, replace it. Never attempt to recharge it yourself — high-pressure nitrogen poses an explosion risk if mishandled.

Safety warnings
•    No welding, drilling, or cutting — internal high-pressure gas can cause an explosion when heated.
•    Always depressurize before maintenance — close the ball valve, slowly loosen the throttle valve, and verify the pressure gauge reads

zero before proceeding.
•    Never disassemble on your own — internal components are complex; always call a trained service engineer.

The accumulator works silently, ready to step in when needed. Two simple rules: depressurize before touching, and replace if pressure drops too low.

Not sure how to check it? Contact your GENMA service engineer. Safety comes first — don't take chances.