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Singer Tension Assembly — #317383-900
Machine: Singer 4562
Product Overview
The Singer Tension Assembly #317383-900 is the upper thread tension unit used on the Singer 4562 sewing machine. This assembly regulates the amount of tension applied to the upper thread to ensure balanced stitches between the top thread and bobbin thread.
Function
The tension unit performs several critical tasks:
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Controls upper thread tension
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Keeps stitches balanced and even
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Adjusts pressure on the thread using tension discs and spring
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Works with the take-up lever and bobbin tension to form proper stitches
If the tension assembly fails, the machine cannot maintain proper stitch formation.
Compatible Singer Models
Commonly used with:
4552, 4562, 4622, 7028, 9005, 9008, 9010, 9022, 9423, 93234
Common Replacement Reasons
Technicians replace the tension unit when:
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Tension discs are worn or damaged
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Check spring breaks
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Thread jams inside the assembly
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Tension knob no longer adjusts correctly
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Machine produces loops on the underside of fabric