Heavy Equipment Mechanic how-to

How to Relieve Hydraulic Pressure Before Repairs

Stored hydraulic pressure can cause serious injection injuries.

Updated By the Career Education Institute Curriculum Team
Quick answer

Stored hydraulic pressure can cause serious injection injuries. In short: lower; shut; cycle, then complete the remaining steps below.

Step by step

  1. Lower all attachments to the ground.

  2. Shut off the engine and remove the key.

  3. Cycle controls to relieve pressure as the manual describes.

  4. Relieve tank pressure slowly.

  5. Block or support raised components.

  6. Loosen fittings slowly and keep your body clear.

Safety reminders for heavy equipment mechanics

  • Relieve hydraulic pressure before opening lines
  • Block raised equipment and never work under unsupported loads
  • Follow lockout/tagout procedures
  • Wear PPE and stay clear of pinch points

Hydraulic system · Hydraulic pump · Cylinder · Relief valve · Undercarriage · Final drive: see the full heavy equipment mechanic glossary.

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