Oilers/Plant Tenders (HHC) Civil Service Practice Exam 2025 - Free Oilers & Plant Tenders Practice Questions and Study Guide

The most appropriate action when encountering a very loose belt in a fan unit is to tighten the loose belt. A loose belt can lead to inadequate performance of the fan unit, excessive noise, and potential wear on the components.

Tightening the loose belt ensures that it functions correctly, allowing the fan to operate at the intended efficiency. It helps maintain proper tension, which is crucial for the fan's performance and longevity. This approach typically involves adjusting the belt tensioning mechanism, which is a common maintenance practice for ensuring that equipment operates within design specifications.

Replacing all belts, while it may seem comprehensive, is not warranted unless the other belts are also showing signs of wear or damage. It adds unnecessary cost and effort, particularly if only one belt is compromised. Adding lubricant to belts can potentially lead to slippage, and adjusting the motor position should only be considered if alignment issues are present. Hence, tightening the loose belt directly addresses the immediate problem and is the most effective course of action.