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Graco 165623 Lock Nut

The Graco 165623 Lock Nut is an OEM structural fastener used on pump mounting tubes to ensure stable alignment and prevent loosening during operation.

  • Fits 30:1 President Pump – Model 206897 (Series F)
  • 3/4" garden hose thread type
  • Used structurally, not in fluid path
  • Ensures long-term pump stability and alignment

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OEM Lock Nut for Graco Pump Assemblies – Model Reference 165623

Compatible Machines

  • Graco 30:1 President Pump – Model 206897 (Series F)

If your sprayer/rig uses the above pump assembly, check its parts diagram to confirm this lock nut before ordering.

Graco 165623 Lock Nut is the OEM “special lock” nut used on the mounting tubes of specific Graco displacement pump assemblies. It maintains alignment and resists loosening from vibration during operation.

  • Helps keep pump mounting tubes securely aligned over time.
  • Designed for the assembly requirements of the 30:1 President Pump.
  • Used structurally (not in the fluid path) for reliable service life.
OEM Part # 165623
Component Name Nut, Special Lock
Thread Type 3/4" Garden Hose Thread (per pump manual reference)
Typical Location Mounting tubes on the displacement pump (structural fastener)
Confirmed Assembly Fit 30:1 President Pump – Model 206897 (Series F)
Quantity Used in Assembly 3 (per referenced pump assembly)

Notes & Installation Tips

  • Install and tighten the lock nut on the large mounting tube first, then on the remaining tube(s) while keeping alignment.
  • Always verify compatibility against your pump/sprayer parts diagram before purchase.
  • Do not substitute generic nuts—use the specified thread and profile for proper fit.

Frequently Asked Questions

It is confirmed for the 30:1 President Pump (Model 206897, Series F). If your sprayer uses this pump assembly, it likely uses this lock nut. Always confirm by checking your exact parts diagram.

No. This is a structural fastener for the pump mounting tubes and is not in the fluid path.

Follow the torque guidance in your specific pump/sprayer service manual. Torque values can vary by series and assembly.

Yes, but when rebuilding or realigning the pump mounting tubes, it’s good practice to inspect all related fasteners and replace any worn or damaged ones together.

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