Service

Repairing the Air Valve

Tools Required

DTorque wrench

DTorx (T20) screwdriver or 7 mm (9/32”) socket

DNeedle-nose pliers

DO-ring pick

DLithium base grease

NOTE: Air Valve Repair Kits 236273 (aluminum center housings) and 255061 (stainless steel center hous- ings) are available. Refer to page 28. Parts included in the kit are marked with a symbol, for example (4{H). Use all the parts in the kit for the best results.

Disassembly

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 12.

1.

Relieve the pressure.

2.

With a Torx (T20) screwdriver or 7 mm (9/32”)

 

socket wrench, remove the six screws (3), air

 

valve cover (2), and gasket (4). See Fig. 7.

32

2 4{H

Torque to 50–60 in-lb

2

 

 

 

(5.6–6.8 NSm).

 

 

 

 

04618B

Fig. 7

 

 

 

 

 

 

 

 

1

See Detail at right.

5

3. Move the valve carriage (5) to the center position

and pull it out of the cavity. Remove the valve

2 Grease.

3 Grease lower face.

2 H{6

block (7) and o-ring (6) from the carriage. Using a

needle-nose pliers, pull the pilot block (18) straight

up and out of the cavity. See Fig. 8.

4. Pull the two actuator pistons (11) out of the bear-

ings (12). Remove the u-cup packings (10) from

the pistons. Pull the pilot pins (16) out of the

bearings (15). Remove the o-rings (17) from the

pilot pins. See Fig. 9.

5. Inspect the valve plate (8) in place. If damaged,

use a Torx (T20) screwdriver or 7 mm (9/32”)

socket wrench to remove the three screws (3).

Remove the valve plate (8) and, on aluminum

center housing models only, remove the seal (9).

See Fig. 10.

6. Inspect the bearings (12, 15) in place. See Fig. 9.

The bearings are tapered and, if damaged, must

be removed from the outside. This requires disas-

sembly of the fluid section. See page 23.

7. Clean all parts and inspect for wear or damage.

Replace as needed. Reassemble as explained on

page 17.

3 H{7

H{18 3

5 1

11

16

04900

Fig. 8

16 308550

Page 15 Page 17
Page 16
Image 16
Graco 308550ZAC Service, Repairing the Air Valve, Tools Required, Disassembly, Relieve the pressure
Page 15 Page 17

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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