A heavy duty equipment technician is replacing a hydraulic hose on a large excavator. The system has been shut down, but the technician notices that the hydraulic cylinder is still extended under pressure. What is the most critical step to take before proceeding with the hose replacement?

Question: A heavy duty equipment technician is replacing a hydraulic hose on a large excavator. The system has been shut down, but the technician notices that the hydraulic cylinder is still extended under pressure. What is the most critical step to take before proceeding with the hose replacement?

Answer options: ✅ Bleed the hydraulic system pressure at a safe, designated port.

• Place a 'Do Not Operate' tag on the machine's controls.
• Ensure all lifting points are properly marked.
• Verify the availability of spare hose clamps.

Correct answer: Bleed the hydraulic system pressure at a safe, designated port.

Explanation: Before replacing a hydraulic hose, it is crucial to relieve any stored hydraulic pressure to prevent serious injury from high-pressure fluid. Bleeding the system at a designated port safely dissipates this energy. While tagging the machine is important for lockout, it doesn't address the stored energy, and the other options are unrelated to depressurizing the system.