Graco 164925 Piston Rod

Graco 164925 Piston Rod is a genuine air-motor component that restores smooth cycling and sealing. Use it when the rod is worn, scored, or bent.

Quick facts to confirm fit and ensure a proper repair:

Fits air-motor assembly: Model 205-647 (Series L)
Section: Air motor (not fluid section)
Catalog name: Rod, Piston (PN 164925)
Replace during packing service if surface shows wear
Verify against your unit’s parts diagram before ordering

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Description

Overview & Compatibility for 164925

The Graco 164925 Piston Rod (listed as “Rod, Piston”) is a genuine replacement component used inside the air-motor section of select industrial Graco pumps. It transfers motion within the air motor and should be replaced if scored, bent, or excessively worn.

Compatible Machines / Assemblies

Graco Air Motor Model 205-647 (Series L) — in-line mounting, medium-pressure oil pump
Industrial pump assemblies that use the above air motor (often found in President-series air-motor systems) — confirm via your unit’s parts diagram

Key Details

Attribute	Value
Part Number	164925
Part Name (Catalog)	Rod, Piston
Assembly Location	Air-motor section of pump
Known Compatible Assembly	Air Motor 205-647 (Series L)
Typical Use Case	Replacement when rod is worn/scored to restore sealing and smooth stroke

Installer Notes

Inspect for scoring or bending; replace if surface is damaged to prevent premature packing wear.
Clean components and use correct lubrication during reassembly.
Verify your pump’s air-motor model; if it matches 205-647 (Series L) or an assembly that specifies 164925, this part applies.

Frequently Asked Questions

Check your pump’s air-motor model in the parts manual or data plate. If the air motor is 205-647 (Series L) or your schematic lists 164925 for the piston-rod line item, it’s the correct replacement.

Visible scoring, uneven wear, or bending; recurring packing leaks; rough stroke or inconsistent cycling from the air-motor assembly.

No. This part is specified for the air-motor section. Fluid-section rods and rams differ by pump ratio and kit; always match the exact assembly from your manual.

Keep the rod and sealing surfaces clean, replace worn packings while the motor is open, and follow the torque and sequence in your unit’s service manual.