Question 89General Subjects - QMED

70% to pass

Machinery with ball bearings designed to be filled with grease should have the relief plug temporarily removed while grease is being added. This plug should remain out until the machinery has been operated and sufficiently warmed up to ensure that _______________.

Aall air pockets are vented from the grease
Bdirt and grit are flushed from the bearing housing
Cthe grease is properly distributed within the bearing
Da path of expansion is provided for the grease
AI Explanation

The correct answer is D) a path of expansion is provided for the grease. When grease is added to machinery with ball bearings, the heat generated during operation causes the grease to expand. Leaving the relief plug temporarily removed allows this expansion to occur, preventing excessive pressure buildup within the bearing housing. This helps ensure the grease is distributed properly and does not blow out seals or damage the bearings. The other options are incorrect because they do not directly address the purpose of leaving the relief plug open - to allow for grease expansion. Option A is not the primary reason, option B is not necessary, and option C, while important, is not the main purpose of the open plug.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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