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Graco 164459 Shaft Seal

The Graco 164459 Seal, Shaft is an OEM sealing element for the pump/lower that prevents leakage along the drive shaft and helps maintain consistent spray pressure.

  • Function: Seals the rotating shaft to reduce fluid loss.
  • Location: Lower/pump assembly shaft interface.
  • Fitment: Use if your parts manual/BOM lists 164459.
  • When to replace: During lower rebuilds or if leakage/pressure drop is observed.

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Detailed Overview: Graco 164459 Seal, Shaft (OEM)

The Graco 164459 Seal, Shaft is a precision sealing element used inside pump/lower assemblies to prevent fluid leakage along the drive shaft and maintain spray pressure and reliability.

Compatible Machines

This seal is used in pump/lower assemblies that explicitly list 164459 in their parts manuals. Models commonly associated with these pump families include (verify by serial/model & pump type):

  • Selected Ultra Max II 695 & Ultra Max II 795 (check your pump assembly bill of materials)
  • Selected GMAX II 3900 & GMAX II 5900 (confirm by pump version)
  • Other Graco contractor/industrial sprayers using lowers that specify 164459

Key Details

  • Function: Seals around the rotating shaft to minimize leakage and maintain system pressure.
  • Build: OEM-grade materials for durability with paints, coatings, and compatible solvents.
  • When to replace: During lower rebuilds or if you observe leakage, pressure loss, or shaft play.

Specifications

Attribute Value
Part Number 164459
Part Type Seal, Shaft (OEM Graco)
Typical Location Lower/pump assembly – shaft interface
Primary Purpose Leak prevention, pressure retention, and contamination control
Recommended Use Replace during pump service/rebuild or when leakage is present

Maintenance Tips

  • Inspect the shaft and bushing for wear before installing the new shaft seal.
  • Use clean lubricant compatible with the seal material and fluid being sprayed.
  • Follow correct orientation and seating depth to avoid premature failure.

Frequently Asked Questions

Clean the bore and shaft, lightly lubricate the Graco 164459 Seal, Shaft, align squarely, and press to the specified depth. Inspect for nicks or burrs that could damage the seal lip during installation.

Abrasive solids in fluid, chemical incompatibility, heat, misalignment, rough shaft surface finish, or incorrect seal orientation are the most common drivers of early failure.

Replace the shaft seal whenever you rebuild the lower or at the first sign of leakage/pressure instability. Heavy-duty or abrasive applications may require shorter intervals.

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