Graco 24W617 Piston Rod

Graco 24W617 Piston Rod is a genuine OEM replacement rod and piston valve assembly for ProConnect pump sprayers. It restores pressure, smooth priming, and reliable spray performance.

Fits Graco 390 PC, 395 Ultra PC, 490/495/595 Ultra Max II, and Pro210ES models.
Compatible with pump lowers 17C487 and 17C721.
Fixes issues like low pressure, poor priming, or spray cutoff.
Durable OEM-quality replacement part for long-lasting use.

Retail Price: $138.5

You save: $29.64 (21.40%)

Our Price: $108.86

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Description

Fitment & Specs — Graco 24W617 Piston Rod

Compatible Machines

The 24W617 Piston Rod is used in ProConnect-style pump lowers on the following sprayers (verify your exact model number and pump style):

Graco 390 PC — Models 17C310 (Hi-Boy), 17C313 (Stand)
Graco Ultra 395 PC — Models 17E844 (Stand), 17E845 (Lo-Boy), 17E846 (Hi-Boy)
Graco Ultra Max II 490 — Models 17E852 (Stand), 17E853 (Lo-Boy), 17E854 (Hi-Boy)
Graco Ultra Max II 495 — Models 17E855 (Stand), 17E856 (Lo-Boy), 17E857 (Hi-Boy)
Graco Ultra Max II 595 — Models 17E858 (Lo-Boy), 17E859 (Hi-Boy)
Graco Pro210ES — Cart & Stand (ProConnect pump)

What is 24W617?

The Graco 24W617 Piston Rod is the OEM rod + piston valve assembly that drives the up/down stroke inside the pump cylinder. It restores prime, pressure, and consistent spray when the original rod is worn, scratched, or cut by high pressure.

Key Details

Part Number	24W617
Category	Piston Rod & Piston Valve Assembly (Pump Lower component)
Pump Style	ProConnect style pump lowers (match by sprayer model & pump PN)
Typical Symptoms Resolved	Poor priming, loss of pressure, pulsation, spray cutoff caused by rod/piston wear
Recommended Checks During Install	Inspect cylinder, packings, seals, check balls/seats; replace worn items together
Compatibility Note	Verify in your sprayer parts manual; some series have multiple pump variants

Compatibility Tips

Confirm your sprayer’s exact model (e.g., 17E855) and pump lower PN (e.g., 17C487).
If your unit is a regional variant, compare the pump lower diagram to ensure the same rod/piston design.
When the rod shows scoring or the piston valve leaks, replace packings and check valves at the same time.

Frequently Asked Questions

Match the sprayer model code (e.g., 17E856) and the pump lower part number (e.g., 17C487/17C721) in your parts manual. If both align with ProConnect pump lowers listed above, 24W617 is the correct rod assembly.

Hard priming, intermittent pressure, visible rod scoring, or persistent leaks past the piston valve. These issues often appear alongside worn packings or damaged check valves.

It’s smart to inspect and often replace packings, seals, check balls/seats, and to check the cylinder for scoring. Rebuilding related wear items together extends service life and reduces downtime.

Yes. 24W617 is a genuine Graco component designed for ProConnect pump lowers used on the listed sprayers.

Lubricate per the manual, torque to spec, flush the unit, and use the correct filters/tips for your material. Avoid dry running and keep the sprayer clean to minimize abrasive wear on the new rod.