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Telehandler Operator Certification Exam Prep · Question

During operation, a telehandler's boom extends slower than usual when a heavy load is applied, but retracts at a normal speed. The hydraulic pump sounds normal, and there are no visible external leaks. What is the most likely cause of this issue?

A slow extension under load but normal retraction points to an issue with the pressure relief in the extend circuit, likely a faulty or improperly set relief va

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Question: During operation, a telehandler's boom extends slower than usual when a heavy load is applied, but retracts at a normal speed. The hydraulic pump sounds normal, and there are no visible external leaks. What is the most likely cause of this issue?

Answer options: ✅ A relief valve for the boom extend circuit is faulty or improperly set.

  • The main hydraulic filter is completely blocked.
  • Excessive air in the hydraulic tank.
  • A directional control valve for boom retraction is stuck open.

Correct answer: A relief valve for the boom extend circuit is faulty or improperly set.

Explanation: A slow extension under load but normal retraction points to an issue with the pressure relief in the extend circuit, likely a faulty or improperly set relief valve allowing pressure to bypass. A blocked main filter would generally affect all hydraulic functions, and air in the tank or a stuck retraction valve would present differently.

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