Graco Inc 308-548, 390sts, 231-353 manual Flushing, When to Flush, How to Flush

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Flushing

When to Flush

1.Before using a new sprayer: flush out the oil which was left in to protect pump parts.

Before using water-base paint: flush with min- eral spirits followed by soapy water, and then a clean water flush.

Before using oil-base paint: flush with mineral spirits only.

2.Changing colors: flush with a compatible solvent such as mineral spirits or water.

3.Changing from water-base to oil-base paint: flush with warm, soapy water, and then mineral spirits.

4.Changing from oil-base to water-base paint: flush with mineral spirits, then warm, soapy water, and then a clean water flush.

5.Storage after using water-base paint: flush with water and then mineral spirits. Leave the system filled with mineral spirits. Relieve pressure. Leave the drain valve open.

Storage after using oil-base paint: flush with mineral spirits. Relieve pressure. Leave the drain valve open.

CAUTION

Never allow water to freeze in the pressure control. Doing so prevents the sprayer from being started and may cause serious damage. Push the water out with mineral spirits.

6.Startup after storage. Before using water-base paint, flush out the mineral spirits with soapy water and then clean water. When using oil-base paint, flush out the mineral spirits with the paint.

How to Flush

1.Follow the Pressure Relief Procedure on page 9.

2.Remove the spray tip and clean it separately.

3.Pour one-half gallon (2 liters) of compatible solvent into a grounded metal flushing pail. Put the suction hose in the pail.

4.Open the pressure drain valve. See Fig. 4, page 7.

5.To save the paint still in the pump and hose, follow Step 6, except put the drain tube in the paint pail. When solvent appears, close the drain valve. Put the drain tube in the flushing pail. Trigger the gun into the paint pail. When solvent appears, re- lease the trigger. Continue with Step 6.

WARNING

FIRE AND EXPLOSION HAZARD

To reduce static sparking and splashing,

always remove the spray tip from the gun, and hold a metal part of the gun firmly to the side of a grounded metal pail when

flushing.

6.Lower the pressure setting. Turn on the sprayer. Maintaining metal-to-metal contact, trigger the gun into the flushing pail. Slowly increase the sprayer pressure until the pump starts. Keep the gun trig- gered until the solvent flows freely from the gun. Circulate the solvent to thoroughly clean the spray- er. Release the gun trigger. Engage the gun trigger safety.

7.Open the drain valve and circulate the solvent through the drain tube to thoroughly clean it. Close the drain valve.

8.Remove the suction hose from the pail. Disengage the gun trigger safety. Trigger the gun and run the pump a few seconds to push air into the hose. Do not run the pump dry for more than 30 seconds to avoid damaging the pump packings! Relieve pres- sure.

9.Remove and clean the inlet strainer. Wipe paint off the suction hose and drain tube.

10.Refer to When To Flush, Step 1 again. Relieve pressure.

11.Leave the drain valve open until you use the sprayer again.

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Contents Model 231-353, Series a Rev. D Supercedes Rev. CSymbols Table of ContentsInjection Hazard Equipment Misuse Hazard Major Components Setup How to use the pressure drain valve How to Use the Gun Trigger SafetyHow to use the pressure control OperationHow to remove a tip clog How to use the RAC IV tip guardStartup Procedure Pressure Relief ProcedureStartup Fire and Explosion Hazard 102 Shutdown and Care Shutdown and CareHow to Flush When to FlushFlushing Basic Problem Solving TroubleshootingIntermediate Problem Solving If pump consistently comes to rest with Use AC power or a different generator Motor Test SetupArmature Short Circuit Test Tool List General Repair InformationMotor Brushes Test the brushes Removing the pump See Fig Displacement Pump RepairDisassembling the pump See Fig Intake valve repair See FigReassembling the pump 110 108 107 116 Motor On/Off Switch Power Supply CordMotor Start Board Drive Housing, Connecting Rod, Crankshaft REF a Pressure Control Pressure Transducer Drain Valve Inlet Strainer Installation/RemovalAccessories Displacement Pump Parts Drawing and ListModel 236-787, Series a Fluid Filter Kit Low Profile Cart KitModel 231-353, Series a Sprayer Parts DrawingMotor KIT Sprayer Parts ListDimensions Technical DataGraco 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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