Graco 15F855 Pump Pin

The Graco 15F855 Pump Pin is a genuine OEM part designed for secure connection between the pump and drive assembly. Ideal for maintaining pump stability and reliable performance.

Fits LineLazer IV 3900
Fits GMAX 3400
Fits GMAX II 3900

$23.6

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Description

Overview & Key Details

Compatible Machines

Graco LineLazer IV 3900 (Airless Line Striper)
Graco GMAX 3400 (Gas Airless Sprayer)
Graco GMAX II 3900 (Gas Airless Sprayer)

Tip: 15F855 is the pump pin for the models above; some closely related machines (e.g., 5900 variants) use a different pin (15F856). Always verify with your unit’s parts manual.

About the Graco 15F855 Pump Pin

The Graco 15F855 Pump Pin is an OEM hardware component that secures the pump linkage/connecting rod assembly in select Graco line stripers and gas airless sprayers. Using the correct OEM pin maintains proper pump alignment and reliable priming/pressure performance.

Key Features

Genuine OEM part for precise fit and durability
Beveled ends for easy installation and secure seating
Critical interface between pump and drive components

Specifications

Part Number	15F855
Description	Pin, Pump (linkage/pump interface)
Approx. Size	~1.2125" (30.80 mm) length × 5/16" diameter; 45° bevel on both ends
Category	OEM hardware & fasteners
Replaces / Related	For 5900 variants use 15F856 (check model manual)

Fitment Notes

Engineered for the models listed under Compatible Machines.
If your plate/serial tag indicates a different series (e.g., 5900), confirm the pin number in your parts manual before ordering.

Frequently Asked Questions

For many 5900 configurations Graco specifies pin 15F856, not 15F855. Check your exact model and manual before purchase.

Match your model (e.g., LineLazer IV 3900, GMAX 3400, GMAX II 3900) with the parts list in the official manual. If your model differs, verify the pin callout in the pump/drive diagram.

Yes—this is a genuine Graco OEM pump pin designed for proper fit and service life.

Depressurize the system, align the connecting rod and pump bore, and insert the beveled pin fully. Replace worn retaining springs/clips as needed and verify free movement before use.

Graco pins can vary across series. If your measurement doesn’t match (~1.21" length × 5/16" Ø with beveled ends), re-check your exact model and manual; you may require a different pin (e.g., 15F856).