• Shut off the power source and isolate all hydraulic or pneumatic supply lines.
• Depressurise the system fully using the correct bleed-down procedure.
• Bleed accumulators separately — they hold pressure independently of the main system.
• Verify zero pressure on the system gauge before opening any connections.
• Apply lock out tag out devices to all isolation points after depressurising.
• Wear face and hand protection when working near pressurised fittings.
• Use the manufacturer's manual for system-specific isolation steps.
• Block or prop hydraulic rams to prevent gravity-induced movement after isolation.
• Inspect hoses and fittings for damage or leaks before re-pressurising.
• Record the isolation on the permit and inform all affected personnel.

• DON'T assume a hydraulic system is safe because the engine is off.
• DON'T run your hand over hydraulic hoses to check for leaks.
• DON'T open fittings or connections without confirming zero pressure first.
• DON'T stand under hydraulic rams without mechanical props in place.
• DON'T use compressed air to clean clothing, skin, or the work area.
• DON'T forget to bleed accumulators — they hold pressure after shut-down.
• DON'T attempt hydraulic isolation without proper training and competence.
• DON'T re-pressurise a system without removing all locks and tags first.
• DON'T ignore small leaks — pinhole jets can penetrate skin unseen.
• DON'T bypass pressure relief valves or safety devices for any reason.

See also: Lock Out Tag Out Awareness | Mechanical Isolation