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:

  • CAT 320D / 320D L

  • CAT 320D LN

  • CAT 323D L

  • 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:

  • Swinging is slow or sluggish: The machine struggles to turn.

  • Inability to swing: The function fails completely.

  • Swing drift: The upper structure slowly drifts or creeps on its own when it should be stationary.

  • Unusual noises: Grinding, knocking, or whining sounds coming from the swing mechanism during operation.

  • Oil leakage: Hydraulic oil leaking from the motor or gearbox seals.

3. Important Note on Sourcing this Part

  • 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.

  • Aftermarket/Replacement: Many reputable manufacturers produce high-quality compatible replacement parts for the 536-6580 group. These can offer significant cost savings.

  • 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.