V-belt efficiency depends on the load being transmitted, sheave sizes, the
number and size of belts, and their temperature. But most of all, efficiency is
affected by installation and maintenance factors, such as tension,
misalignment, and worn sheaves.
A well-designed, properly aligned and tensioned V-belt drive is most
efficient — about 97% — when first installed. With time and use, the belts
stretch, lose tension, and begin to slip in their sheaves. The result:
efficiency drops to about 94%, provided that the sheaves are in good condition
and slippage is normal. To minimize this drop in efficiency over time, keep
belts properly tensioned and aligned.
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