Service

4.Unscrew one outer plate (105) from the diaphragm shaft (24). Remove one diaphragm (401), and the inner plate (104). See Fig. 13.

For overmolded diaphragms: Grip both dia- phragms securely around the outer edge and rotate counterclockwise. One diaphragm assembly will come free and the other will remain attached to the shaft. Remove the freed diaphragm and air side plate.

NOTE: PTFE models include a PTFE diaphragm (403) in addition to the backup diaphragm (401).

5.Pull the other diaphragm assembly and the dia- phragm shaft (24) out of the center housing (1). Hold the shaft flats with a 19 mm open–end wrench, and remove the outer plate (105) from the shaft. Disassemble the remaining diaphragm assembly.

For overmolded diaphragms: Pull the other dia- phragm assembly and the diaphragm shaft (24) out of the center housing (1). Hold the shaft flats with a 19 mm open–end wrench and remove the diaphragm and air side plate from the shaft.

6.Inspect the diaphragm shaft (24) for wear or scratches. If it is damaged, inspect the bearings (19) in place. If the bearings are damaged, refer to page 23.

7.Reach into the center housing (1) with an o-ring pick and hook the u-cup packings (402), then pull them out of the housing. This can be done with the bearings (19) in place.

8.Clean all parts and inspect for wear or damage. Replace parts as needed.

Reassembly – Standard Diaphragms

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

2.Grease the length and ends of the diaphragm shaft

(24)and slide it through the housing (1).

3.Assemble the inner diaphragm plates (104), dia- phragms (401*), PTFE diaphragms (403*, if pres- ent), and outer diaphragm plates (105) exactly as shown in Fig. 13. These parts must be assembled correctly.

4.Apply medium-strength (blue) LoctiteR or equiva- lent to the threads of the fluid-side plates (105). Hold one of the outer plates (105) with a wrench, and torque the other outer plate to 20 to 25 ft-lb (27 to 34 NSm) at 100 rpm maximum. Do not over-torque.

5.Align the fluid covers (101) and the center housing

(1)so the arrows (A) on the covers face the same direction as the air valve (B). Secure the covers with the screws (107 and 108), handtight. Install the longer screws (108) in the top and bottom holes of the covers. See Fig. 12.

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

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

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Graco 308550ZAC important safety instructions Reassembly Standard 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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