Service

1

Insert narrow end first.

3

Install with lips facing

narrow end of piston (11).

 

 

 

2

Grease.

4

Insert wide end first.

10{H 2 3

11 4

12

2 17{

15 16 1

04901

Fig. 9

Reassembly

1.If you removed the bearings (12, 15), install new ones as explained on page 23. Reassemble the fluid section.

2.On aluminum center housing models, install the valve plate seal (9{) into the groove at the bottom of the valve cavity. The rounded side of the seal must face down into the groove. See Fig. 10.

3.Install the valve plate (8H) in the cavity. On alumi- num center housing models, the plate is reversible, so either side can face up. Install the three screws (3), using a Torx (T20) screwdriver or 7 mm (9/32”) socket wrench. Tighten until the screws bottom out on the housing. See Fig. 10.

4.Install an o-ring (17{H) on each pilot pin (16). Grease the pins and o-rings. Insert the pins into the bearings (15), narrow end first. See Fig. 9.

5.Install a u-cup packing (10{H) on each actuator piston (11), so the lips of the packings face the narrow end of the pistons. See Fig. 9.

1

Rounded side must face down.

3 2

2

Tighten screws until

 

they bottom out on the

 

 

8H

 

housing.

 

9{ 1

03947

Fig. 10

6.Lubricate the u-cup packings (10{H) and actuator pistons (11). Insert the actuator pistons in the bearings (12), wide end first. Leave the narrow end of the pistons exposed. See Fig. 9.

7.Grease the lower face of the pilot block (18{H) and install so its tabs snap into the grooves on the ends of the pilot pins (16). See Fig. 8.

8.Grease the o-ring (6{H) and install it in the valve block (7{H). Push the block onto the valve carriage

(5). Grease the lower face of the valve block. See Fig. 8.

9.Install the valve carriage (5) so its tabs slip into the grooves on the narrow end of the actuator pistons (11). See Fig. 8.

10.Align the valve gasket (4{H) and cover (2) with the six holes in the center housing (1). Secure with six screws (3), using a Torx (T20) screwdriver or 7 mm (9/32”) socket wrench. Torque to 50–60 in-lb (5.6–6.8 NSm). See Fig. 7.

308550 17

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Image 17
Graco 308550ZAC important safety instructions Reassembly
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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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