Replaces Graco 240517 Piston Rod – GMAX 5900, Ultra Max II 1095 & 1595

Replaces Graco 240517 Piston Rod – GMAX 5900, Ultra Max II 1095 & 1595

Restore the fluid section on your Graco airless paint sprayer with this aftermarket piston rod that replaces Graco Part #240517 / 240-517.

The piston rod is a critical working component inside the displacement pump. A worn, scored, pitted, or damaged rod can cause packing leakage, premature packing failure, loss of pressure, and poor pump performance.

This quality aftermarket piston rod fits a range of larger Graco professional airless sprayers, including the GMAX 5900, GMAX II 5900, Ultra Max II 1095, Ultra Max II 1595, Ultimate MX series, and LineLazer 5900.

Part Information:

• Replaces Graco Part Number: 240517 / 240-517
• Product: Displacement Pump Piston Rod
• Type: Aftermarket
• Application: Airless Paint Sprayer Fluid Section / Displacement Pump
• Brand Compatibility: Graco

Fits Graco Airless Paint Sprayers:

• GMAX 5900
• GMAX II 5900
• GMx 5900
• GMAX 10000
• GM 3012
• Ultimate MX 1595
• Ultimate MX II 1095
• Ultimate MX II 1595
• Ultra Max 1595
• Ultra Max II 1095
• Ultra Max II 1595
• LineLazer II 5900
• LineLazer III 5900
• LineLazer IV 5900

Your old compatibility list contained quite a few duplicate models with the words rearranged—for example, 5900 GMAX and GMAX 5900. I've consolidated those so customers get a much cleaner compatibility list without losing useful fitment information.

It may fit additional Graco displacement pumps that specify Part #240517. Always verify the original piston rod part number before ordering.

Features:

• Replaces Graco 240517 / 240-517
• Displacement pump piston rod
• Precision working surface for the fluid pump packings
• Fits numerous Graco GMAX, Ultra Max, Ultimate MX and LineLazer sprayers
• Quality aftermarket component
• Ideal for fluid pump rebuilding and repair
• Helps prevent premature failure of new pump packings
• Economical alternative to replacing the complete displacement pump
• Helps keep older professional Graco equipment in service

What the Piston Rod Does

The piston rod moves continuously through the pump packings as the displacement pump cycles. The rod and packings work together to create the seal necessary for the pump to develop the high fluid pressures required for airless spraying.

Because the packings ride directly against the piston rod, the condition of the rod's working surface is extremely important.

Abrasive coatings, contamination, dried material, corrosion, and normal operating wear can eventually cause the rod to become scored, grooved, pitted, or worn. Once the surface is damaged, installing new packings alone may result in premature packing failure.

Common Signs of a Worn Piston Rod:

• Fluid leaking from the upper packings
• Visible scoring or grooves on the rod
• Pitting or corrosion
• New packings begin leaking prematurely
• Difficulty maintaining spray pressure
• Excessive packing adjustment
• Reduced or inconsistent pump performance
• Fluid section requires frequent rebuilding

Rebuilding Your Graco Fluid Pump

If you're installing new packings, inspect the piston rod carefully while the pump is apart.

One of the simplest checks is to run your fingernail across the working surface of the rod. If you can feel a groove, scratch, or pit, the new packings will feel it too—thousands of times while the pump is operating.

While rebuilding the fluid section, inspect the:

• Piston rod
• Cylinder or sleeve
• Upper and lower packings
• Packing glands
• Inlet and outlet balls
• Ball seats
• O-rings and seals

New packings installed against worn hard parts can give you a short-lived rebuild. Replacing the damaged components while the pump is already apart can save having to do the job twice.

Keeping Older Graco Sprayers Working

Professional machines such as the GMAX 5900, Ultra Max II 1095, Ultra Max II 1595, and LineLazer 5900 represent a significant equipment investment, and many older units remain in productive service.

A worn fluid section doesn't necessarily mean the complete pump—or the entire sprayer—needs to be replaced. Rebuilding the pump and replacing worn hard parts such as the piston rod can keep these machines working for years.

That's why we include the original Graco part number and compatible sprayer models whenever possible—making it easier to identify the correct repair parts before ordering.

Important:

This listing is for one aftermarket piston rod that replaces Graco Part #240517 / 240-517.

This is an aftermarket component and is not manufactured by Graco.

Because Graco has produced different generations and series of similar sprayers, always verify the original 240517 part number for the displacement pump currently installed on your machine before ordering.

Need help identifying pump parts for your Graco airless sprayer? Contact us with your sprayer model, series, or original part number—we'll help you find the correct parts to keep your equipment working.