Reassembly – Overmolded Diaphragms

WARNING

To reduce the risk of serious injury, including amputation, do not put your fingers or hand be- tween the air cover and the diaphragm.

1.Lubricate and install the shaft u–cup packings (402*) so the lips face out of the housing (1). See Fig. 13.

2.Assemble the air side plate (104) onto the dia- phragm (403). The wide, radiused side of the plate must face the diaphragm. Apply medium–strength (blue) Loctite or equivalent to the threads of the diaphragm assembly. Screw the assembly into the shaft (24) hand–tight.

3.Grease the length and ends of the diaphragm shaft (24). Insert the shaft/diaphragm assembly into one side of the pump. Align the fluid cover (101) and the center housing (1) so the arrow (A) faces the same direction as the air valve. Secure the cover with the screws (107 and 108), handtight.

4.Torque the longer screws (108) oppositely and evenly to 190–220 in–lb (21–25 NSm), using a 13mm socket wrench. Then torque the shorter screws (107). See Torque Sequence, page 32.

5.Assemble the other diaphragm assembly to the shaft as explained in step 2. This diaphragm will be lifted off the air cover at this point.

6.Supply the pump with low pressure air (less than 7 psi [0.05 MPa, 0.5 bar]). The diaphragm will very slowly pull onto the air cover. Find the pressure that keeps the diaphragm close enough to secure with the screws, but does not let it contact the pilot pin.

NOTE: Do not deform the diaphragm manually. The diaphragm needs uniform pressure to deform properly for maximum life.

7.Align the fluid cover (101) and the center housing

(1) so the arrow (A) faces the same direction as the air valve. Secure the cover with two of the longer screws (108), handtight.

NOTE: If the diaphragm contacts the pilot pin and is forced away from the air cover, try Step 5 again. If necessary, return to Step 3.

8.Torque the longer screws (108) oppositely and evenly to 190–220 in–lb (21–25 NSm), using a 13mm socket wrench. Then torque the shorter screws (107). See Torque Sequence, page 32.

9.Reassemble the ball check valves and manifolds as explained on page 18.

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Graco 308550ZAC important safety instructions Reassembly Overmolded Diaphragms
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308550ZAC specifications

The Graco 308550ZAC is a versatile and efficient airless paint sprayer designed for both DIY enthusiasts and professional contractors. Known for its reliability and performance, this unit provides consumers with a powerful solution for their painting projects, ensuring a smooth and even finish.

One of the standout features of the Graco 308550ZAC is its ProXChange technology. This innovative system allows for quick and easy pump replacement without the need for additional tools or complex procedures. This feature ensures minimal downtime, making it especially valuable on job sites where time efficiency is crucial.

The sprayer is also equipped with a powerful electric motor that delivers a consistent pressure of up to 3000 PSI. This high pressure not only facilitates a fine atomization of paint but also enables users to work with a variety of coatings, including thicker materials like latex, stains, and sealers. As a result, users can achieve professional-grade finishes on a range of surfaces, from buildings to fences.

Another significant characteristic of the Graco 308550ZAC is its adjustable pressure control. This feature allows operators to fine-tune the pressure according to the specific paint being used and the project's requirements. This flexibility translates to improved control over the spraying process, minimizing overspray and ensuring precision, particularly when working on detailed areas.

Additionally, the unit comes with a built-in suction hose, which can be submerged directly into paint containers for efficient and seamless painting. This capability makes it easier to use large buckets, reducing the hassle of constantly refilling the sprayer and enhancing productivity.

The Graco 308550ZAC also features a lightweight and portable design, making it easier to transport between job sites. Its robust construction ensures durability, while the ergonomic handle offers comfort during extended use.

In summary, the Graco 308550ZAC is a robust airless paint sprayer that combines advanced technologies and thoughtful design features to meet the needs of both professionals and hobbyists. With its ProXChange system, adjustable pressure control, and high-performance motor, it represents an excellent choice for achieving flawless finishes in various painting applications.
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