Graco 187613 Displacement rod

The Graco 187613 Displacement Rod is a vital OEM pump component that connects the drive assembly to the fluid section, ensuring smooth paint flow and pressure consistency. Designed for precision fit and durability in professional-grade airless sprayers.

Ensures consistent spray pressure and smooth operation
OEM replacement for select Graco 390 and Nova series sprayers
Restores performance and prevents leaks or pressure loss

Retail Price: $166

You save: $35.52 (21.40%)

Our Price: $130.48

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Description

Compatible Machines

The Graco 187613 Displacement Rod is used in select compact professional sprayers and related legacy units. Confirm your exact model and pump variant before ordering.

Graco 390 ST
Graco 390 STS
Graco Duron 390
NOVA SP (legacy)
NOVA SPX (old version)
Pro 301 ST (Fuller O’Brien)
Pro 301 STS (Fuller O’Brien)
Pro 501 ST (Fuller O’Brien)

Overview & Key Details

The displacement (piston) rod transfers the drive motion into the fluid section, creating the up-stroke to draw material and the down-stroke to pressurize it for consistent spray output. Replacing a worn rod restores sealing surface integrity and helps maintain pressure and finish quality.

Product Specs — Graco 187613 Displacement Rod
OEM Part Number	187613
Category	Pump Wear Part / Displacement Rod (piston rod)
Typical Pressure Range	Up to professional airless operating pressures (verify per machine manual)
When to Replace	Visible scoring/plating wear, pressure loss, leakage, erratic spray, frequent packings failure
Related Service	Inspect/replace packings, cylinder, check balls/seats, and pump seals during rod replacement

Fitment & Service Notes

Match your sprayer’s exact model and pump assembly revision against the parts list.
Some legacy/partner-branded units (e.g., Fuller O’Brien) share the same pump architecture—confirm by part number.
Always lubricate and torque to specification; re-prime and pressure-test after installation.

What’s Included

1 × Graco 187613 Displacement Rod (OEM)

Suggested Complementary Parts

Packing kit for your specific pump model
Inlet/outlet valves (balls & seats) if worn
Pump cylinder / sleeve inspection and seals

Frequently Asked Questions

Check your sprayer’s parts manual or pump assembly breakdown and verify the rod part number. Match both the model and the pump assembly revision; similar models can use different rods across generations.

Difficulty holding pressure, pulsation, leakage at packings, premature packing wear, or visible rod scoring/plating loss. These issues often appear together and warrant a full lower-end inspection.

Yes—rod wear usually accompanies packing wear. Replacing packings and inspecting seats/balls and the cylinder helps restore performance and extends service life.

No. Rods are model-specific and differ in length, surface finish, and interface geometry. Use the exact OEM number (187613) or the official supersession listed for your pump.

Clean all mating surfaces, lubricate per manual, tighten to spec, then prime with appropriate fluid. After reassembly, pressure-test at working pressure and check for leaks before returning to service.