Check Valves

Before disassembling, press on ball (26c) to test check valve for proper movement and spring action.

1. Follow Pressure Relief Procedure, page 15.

2. Remove fluid manifold (M). Leave air connected.

Clean Fluid Manifold, page 20.

M

TI2543A

3. Flush gun to remove residual A and B compo-

nents, page 20. Follow Pressure Relief Proce- dure, page 15.

4. Disconnect air.

TI2540A

CAUTION

To prevent cross-contamination of the check valves, do not interchange A component and B component parts. The A component check valve is marked with an A.

Repair

5. Pry out check valves (26) at notch.

WARNING

Read warnings, page 7. Damaged check valve o-rings (26f, 26g) may result in external leakage. Replace o-rings if any damage is seen.

6. Slide filter (26d) off. Clean and inspect parts. Thor-

oughly inspect o-rings (26f, 26g). If necessary, remove screw (26b) and disassemble entire check valve.

B

A

26b

26e

26c

26d

26

26g

26a

26f TI2429A

7. Reassemble check valves. Screw (26b) should be

flush (within 1/16 in. or 1.5 mm) of housing (26a) surface. Liberally lubricate o-rings (26f, 26g) and carefully reinstall in fluid housing.

8. Attach fluid manifold. Connect air. Return gun to

service.

309550U

31

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Graco 309550U important safety instructions Check Valves, Clean Fluid Manifold
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309550U specifications

The Graco 309550U is a top-of-the-line airless paint sprayer that caters to both professionals and DIY enthusiasts. With its advanced features and user-friendly design, it stands out as an essential tool for achieving a flawless finish on various painting projects.

One of the main characteristics of the Graco 309550U is its powerful motor, which delivers a high level of pressure, making it suitable for a wide range of coatings. This airless sprayer can handle everything from thin paints to thicker latex and enamels without clogging, ensuring smooth and consistent application. The unit is designed to cover large areas quickly, allowing users to complete their projects in a fraction of the time compared to traditional roller or brush methods.

Equipped with Graco's exclusive ProXChange pump technology, the 309550U allows for easy pump replacement on the job site without the need for tools. This feature enhances productivity by minimizing downtime, enabling users to keep working seamlessly. The unit also boasts an innovative suction tube that can draw paint directly from the can, eliminating the need for cumbersome pouring and mess.

Another noteworthy feature is the adjustable pressure control, which allows users to customize the spray pattern and flow rate. This adaptability ensures optimal coverage in various environments and surfaces, whether applying a fine mist for intricate details or a heavier coat for larger surfaces. The built-in filter system further enhances performance by preventing debris from entering the spray mechanism, ensuring a smooth, even finish.

The Graco 309550U is designed with portability in mind. It features a lightweight frame and durable wheels, making it easy to transport across job sites or around the house. Additionally, the sprayer comes with a convenient carry handle for added mobility. Safety features, including a trigger lock, are also implemented to prevent accidental activation, giving users peace of mind during operation.

In conclusion, the Graco 309550U airless paint sprayer is a versatile and efficient tool that combines powerful performance with user-friendly features. Its robust design, ease of use, and innovative technologies make it an ideal choice for both professional painters and homeowners looking to achieve exceptional results in their painting endeavors. Whether you're tackling an interior room, exterior surface, or detailed trim work, the Graco 309550U ensures a flawless finish every time.
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