What is the purpose of a crane's hydraulic oil cooler, and what symptoms indicate it may not be functioning properly?
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A
The oil cooler heats hydraulic fluid in cold weather; symptoms of failure include slow boom extension
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B
The oil cooler removes heat from hydraulic fluid; symptoms of failure include overheating, reduced system pressure, and sluggish operation
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C
The oil cooler filters contaminants from hydraulic fluid; symptoms of failure include unusual hydraulic sounds and jerky motion
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D
The oil cooler stores reserve hydraulic fluid; low fluid warning lights indicate cooler failure