Graco Inc 390sts, 308-548, 231-353 manual 110 108

Page 24

Displacement Pump Repair

3.Tighten the nut (110) onto the piston valve (108) to 2 in-lb (0.23 N.m). See Fig. 20.

NOTE: Note the alignment of the piston (108) to the nut (110). Maintain this alignment through Step 8.

4.Clean all residue from the piston valve threads. Apply one strip of adhesive, supplied, to the threads.

5.Place the ball (109*) on the piston valve (108). See Fig. 20.

1

Torque to

107

 

5 in–lb (0.57 N.m)

 

Apply one strip of

 

2

sealant to these

*109

 

threads

 

 

2

110

Fig. 20

108

01070

 

CAUTION

Step 6, tightening the piston valve into the rod, is critical. Follow the procedure carefully to avoid damaging the packings by overtightening.

6. Hand tighten the valve into the piston rod just until

the nut (110) contacts the rod. See Fig. 21.

Torque nut against rod

1to 30 ft–lb (4o N.m)

Do not allow nut (110)

2 to move relative to piston (108) when tightening piston against rod.

Fig. 21

107

110 1 2

108

01071

7.

Place the flats of the rod (107) in a smooth jaw

 

vise.

8.

CAREFULLY tighten the nut (110) against the pis-

 

ton rod to 30 ft-lb (40 N.m). See Fig. 21.

 

Use two wrenches to maintain the alignment men-

 

tioned in NOTE below Step 3.

9.Stack these parts one at a time into the top of the manifold (101): the male gland (106*), alternately three plastic packings (104*) with two leather pack- ings (105*), and then the female gland (103*). See Fig. 23.

10.Install the packing nut (102) and plug (124), but leave loose for now. See Fig. 23.

 

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Contents Rev. D Supercedes Rev. C Model 231-353, Series aTable of Contents SymbolsInjection Hazard Equipment Misuse Hazard Major Components Setup How to Use the Gun Trigger Safety How to use the pressure drain valveHow to use the pressure control OperationHow to use the RAC IV tip guard How to remove a tip clogPressure Relief Procedure Startup ProcedureStartup Fire and Explosion Hazard 102 Shutdown and Care Shutdown and CareWhen to Flush How to FlushFlushing Troubleshooting Basic Problem SolvingIntermediate Problem Solving If pump consistently comes to rest with Use AC power or a different generator Setup Motor TestArmature Short Circuit Test General Repair Information Tool ListMotor Brushes Test the brushes Displacement Pump Repair Removing the pump See FigIntake valve repair See Fig Disassembling the pump See FigReassembling the pump 110 108 107 116 Motor Power Supply Cord On/Off SwitchMotor Start Board Drive Housing, Connecting Rod, Crankshaft REF a Pressure Control Pressure Transducer Inlet Strainer Installation/Removal Drain ValveDisplacement Pump Parts Drawing and List AccessoriesModel 236-787, Series a Fluid Filter Kit Low Profile Cart KitSprayer Parts Drawing Model 231-353, Series aSprayer Parts List Motor KITTechnical Data DimensionsGraco Warranty and Disclaimers Graco Phone Numbers

390sts, 231-353, 308-548 specifications

Graco Inc. has established itself as a leader in fluid handling equipment, and the Graco 308-548, 231-353, and 390STS models exemplify this commitment to innovation, efficiency, and reliability. These models are designed for high-performance applications in various industries, including automotive, construction, and manufacturing.

The Graco 308-548 is engineered with a powerful motor and advanced pump technology, providing user-friendly operation and outstanding reliability. Its design allows for easy maintenance, minimizing downtime and increasing productivity. The adjustable pressure setting ensures optimal performance for different materials, making it a versatile choice for spray applications. Its lightweight construction and portability enhance usability, allowing operators to move the unit with ease.

On the other hand, the Graco 231-353 model is known for its advanced airless technology, which enables users to achieve a smooth and even finish without the need for thinning. This model is equipped with an efficient pump that delivers consistent material flow, ensuring high-quality results in every application. A notable feature of the 231-353 is its ability to handle a wide range of coatings, including paints, stains, and sealers, making it ideal for both interior and exterior projects.

The Graco 390STS stands out in this lineup with its robust design and powerful performance, suitable for larger scale projects. It incorporates SmartControl technology, which provides precise pressure control and consistent spray patterns, contributing to an efficient work process. The ergonomic design emphasizes operator comfort, reducing fatigue during extended use. Additionally, the 390STS supports a variety of spray tips, allowing for customization based on specific job requirements, further enhancing its versatility.

All three Graco models feature durable construction, capable of withstanding rigorous job site demands. They are built with high-quality materials that resist corrosion and wear, ensuring longevity and reducing the total cost of ownership. The ease of use and intuitive controls minimize the learning curve for new users, making these models accessible to both professionals and DIY enthusiasts alike.

In conclusion, Graco Inc. continues to push the boundaries of fluid handling technology with the 308-548, 231-353, and 390STS models. Their powerful performance, advanced features, and user-friendly designs make them standout choices for anyone in need of reliable spray equipment.
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