Service

Displacement Pump Service

Disassembly

When disassembling the pump, lay out all removed parts in sequence, to ease reassembly. Refer to Fig. 5.

NOTE: Repair Kit 235635 is available. For the best results, use all the new parts in the kit. Parts included in the kit are denoted with an asterisk, for example (17*).

Clean all the parts thoroughly when disassembling. Check them carefully for damage or wear, replacing parts as needed.

1.Remove the displacement pump from the air motor as explained on page 13.

2.Unscrew the intake valve housing (33) from the outlet housing (35). If it is difficult to remove, squirt penetrating oil around the threads and gently tap around the valve housing with a plastic ham- mer to loosen it. See Fig. 5.

3.Remove the ball stop pin (29), o-ring retainer (31), o-ring (30), guide (32) and ball (28) from the intake valve housing (33).

4.Loosen the packing nut (36). Push the displace- ment rod (26) down as far as possible, then pull it out the bottom of the outlet housing (35).

5.Secure the flats of the displacement rod (26) in a vise. Screw the piston stud (34) out of the rod. Re- move the ball (17), retainer (22), packings (18, 23) and glands (24, 25).

6.Remove the packing nut (36), throat packings (18, 23) and glands (24, 25) from the outlet housing (35).

7.Inspect all parts for damage. Clean all parts and threads with a compatible solvent before reassem- bling. Inspect the polished surfaces of the dis- placement rod (26) and sleeve (20) for scratches, scoring or other damage, which can cause prema- ture packing wear and leaking. To check, run a finger over the surface or hold the part up to the light at an angle. Be sure the ball seats of the pis- ton (R) and intake valve housing (S) are not chipped or nicked. Replace any worn or damaged parts.

NOTE: If the sleeve (20) needs replacement and is hard to remove, contact your Graco distributor.

Reassembly

1.Lubricate the throat packings and install them in the outlet housing (35) one at a time as follows, with the lips of the v-packings facing down: the male gland (24*), one leather v-packing (18*), one PTFE (23*), one leather (18*), one PTFE (23*), one leather (18*), one PTFE (23*), and the female gland (25*). Install the packing nut (36) loosely. See the Throat Packing Detail in Fig. 5.

2.If you removed the sleeve (20), reinstall it in the outlet housing (35), making sure to replace the gasket (19*). Be sure the tapered end of the sleeve faces down, toward the pump intake.

3.Lubricate the piston packings and install them onto the piston stud (34) one at a time in the following order, with the lips of the v-packings facing up: the female gland (25*), one PTFE v-packing (23*), one leather v-packing (18*), one PTFE (23*), one leath- er (18*), one PTFE (23*), one leather (18*), the male gland (24*), and the packing retainer (22). See the Piston Packing Detail in Fig. 5.

4.Use thread sealant on the piston stud (34). Install the piston ball (17*) on the piston and screw the piston valve assembly into the displacement rod (26). Torque to 55–65 ft–lb (74–88 N.m).

5.Insert the displacement rod (26) into the bottom of the outlet housing (35), being careful not to scratch the sleeve (20). Push the rod straight up until it protrudes from the packing nut (36).

6.Install the ball (28*), guide (32), o-ring (30*), retain- er (31), and ball stop pin (29) in the intake valve housing (33). Apply thread lubricant and screw the intake housing into the outlet housing (35). Torque to 55–65 ft–lb (74–88 N.m).

7.Reconnect the displacement pump to the air motor as explained on page 13.

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Graco 306981AD important safety instructions Displacement Pump Service, Disassembly, Reassembly
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306981AD specifications

The Graco 306981AD is a versatile and innovative airless paint sprayer designed for professionals and DIY enthusiasts alike. This powerful tool simplifies the painting process, delivering a smooth and even finish across various surfaces. With a focus on efficiency and ease of use, the Graco 306981AD stands out in the market of painting equipment.

One of its main features is the ProXChange technology, which allows users to swap out worn or damaged pumps quickly and without needing special tools. This feature minimizes downtime, enabling more time to be spent on painting rather than equipment maintenance. Additionally, the Graco 306981AD is equipped with a high-efficiency piston pump that delivers consistent pressure, ensuring a fine spray pattern with minimal overspray.

The sprayer supports a wide range of coatings, from thin stains to thicker paints, thanks to its adjustable pressure setting. Painters can easily control the flow of paint to achieve their desired finish. The Graco 306981AD also includes an easy-to-use swivel connector, allowing users to maneuver the sprayer in tight spaces and at various angles without hassle.

In terms of design, the Graco 306981AD features a compact and portable setup. Weighing only a fraction of traditional sprayers, it includes a robust carry handle that enhances portability for on-the-go projects. The durable construction means it can withstand the rigors of demanding job sites, while the streamlined pump design promotes easy storage when not in use.

Another notable characteristic is its SmartControl technology, which provides a steady and adjustable pressure output, ensuring an optimal finish without the risk of material waste. This innovation allows for more consistent results across different applications, whether painting walls, fences, or furniture.

The Graco 306981AD is designed with user comfort in mind, featuring an ergonomic grip that reduces hand fatigue during extended tasks. Coupled with its low vibration operation, the sprayer ensures a comfortable working experience without compromising on performance.

In summary, the Graco 306981AD is a forward-thinking airless paint sprayer that combines efficiency, durability, and ease of use. Its advanced technologies like ProXChange and SmartControl, alongside its versatile functionality and user-centric design, make it a top choice for anyone looking to achieve professional results in their painting projects.
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