1. Primary Application: Caterpillar Excavators
This swing motor group is designed specifically for several models of Caterpillar excavators. You will most commonly find it on these popular models:
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CAT 320D / 320D L
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CAT 320D LN
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CAT 323D L
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CAT 324D / 324D L
It’s always essential to double-check your specific machine’s Serial Number against the part number to ensure compatibility, as there can be variations within model lines.
2. Common Symptoms of a Failing Swing Motor
If this part needs replacement or repair, you might notice these issues with your excavator:
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Swinging is slow or sluggish: The machine struggles to turn.
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Inability to swing: The function fails completely.
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Swing drift: The upper structure slowly drifts or creeps on its own when it should be stationary.
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Unusual noises: Grinding, knocking, or whining sounds coming from the swing mechanism during operation.
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Oil leakage: Hydraulic oil leaking from the motor or gearbox seals.
3. Important Note on Sourcing this Part
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OEM (Original Equipment Manufacturer): This is the genuine Caterpillar part number. Purchasing from a CAT dealer guarantees compatibility and reliability but is often the most expensive option.
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Aftermarket/Replacement: Many reputable manufacturers produce high-quality compatible replacement parts for the 536-6580 group. These can offer significant cost savings.
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Rebuilt/Remanufactured: A very common and cost-effective option is to exchange your faulty core for a remanufactured unit. The old unit is disassembled, cleaned, worn parts are replaced, and it is rebuilt to meet original specifications.
In summary: 536-6580 is a complete Swing Motor Assembly (Motor GP) used primarily on Caterpillar 320D, 323D, and 324D series excavators to provide 360-degree rotation.

