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Graco 166007 Retainer Nut

Quick reference for confirming fit and purpose on your unit.

  • Part No.: 166007
  • Type: Retainer for shaft nut
  • Fits: Crown/Imperial multistage pump assemblies (6–14 stage); verify in your parts manual
  • Role: Prevents shaft-nut loosening and maintains coupling alignment
  • Replace if: Wear, cracks, distortion, or signs of nut movement

Retail Price: $72.5
You save: $1.26 (1.74%)
Our Price: $71.24
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Overview & Key Details

Compatible Machines

Model-specific sprayer lists are not provided by Graco for this part. This retainer is used in Graco Crown/Imperial multistage pump assemblies (6–14 stage families). Please confirm against your pump’s parts manual or contact us with your unit’s model/serial for verification.

What is it?

Graco 166007 Retainer Nut (also referenced as a retainer plate for the shaft nut) secures the shaft nut within the coupling/shaft section of select Graco industrial pump assemblies, preventing loosening, misalignment, and premature wear.

Quick Specs

Part Number 166007
Category Retainer / Plate for shaft nut (industrial pump drivetrain)
Typical Location Coupling / shaft section of multistage pump assemblies (Crown/Imperial series)
Function Holds the shaft nut in position to maintain coupling integrity and alignment
Related Hardware Companion lock wire / fasteners as specified in the applicable pump parts manual

Why it matters

  • Prevents shaft-nut back-off that can cause vibration, coupling damage, and seal failures.
  • Helps maintain pump alignment for longer bearing and seal life.
  • OEM geometry ensures correct fit with the specified coupling/shaft stack-up.

When to replace

  • Visible wear, cracking, distortion, or fretting marks on the retainer.
  • Evidence of shaft-nut movement or recurring loosening.
  • During major pump overhauls or coupling rebuilds as preventative maintenance.

Quick install notes

  • Verify you have the correct retainer per your exact pump model and serial range.
  • Torque the shaft nut to spec, fit the retainer properly against the nut/coupling feature, and secure any specified lock wire/fastener.
  • Rotate by hand to confirm free movement and alignment before returning to service.

Always follow your pump’s official Graco service manual for torque values and sequence.

Frequently Asked Questions

Match 166007 against your pump’s exploded diagram/parts list. If your manual lists this retainer in the coupling/shaft stack-up, it’s the correct part. Share your model and serial with us if you need help verifying.

This retainer is associated with industrial multistage pump assemblies (Crown/Imperial families). It is typically not used on common contractor airless sprayers. Check your model’s parts book to be sure.

Inspect the shaft nut, coupling components, and any lock wire/fasteners. Replace anything worn or distorted, and always follow the manual’s torque and safety procedures during reassembly.

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