Graco Inc 231-353, 390sts, 308-548 manual Use AC power or a different generator

Page 17

Intermediate Problem Solving

TYPE OF PROBLEM

WHAT TO CHECK

WHAT TO DO

 

If check is OK, go to next check

When check is not OK, refer to this column

 

 

 

Spray Pattern Variations

1. Spray tip worn beyond sprayer pressure capa-

1. Replace spray tip.

 

bility.

NOTE: A smaller size tip will provide

 

 

longer life.

 

 

 

2. Check transducer (29) for wear or damage.

2. Replace transducer. See page 31.

 

3.

Check pressure control (64) for smooth opera-

3.

Replace pressure control. See page 30.

 

 

tion.

 

 

 

 

 

 

 

 

4.

Check Low output section, page 16.

 

 

 

 

 

 

 

Motor Is Hot and Runs

1.

Determine if sprayer was operated at high pres-

1.

Decrease pressure setting or increase tip

Intermittently

 

sure with small tips, which causes excessive

 

size.

 

 

heat build up.

 

 

 

 

 

 

 

 

2.

Be sure ambient temperature where sprayer is

2.

Move sprayer to shaded, cooler area if

 

 

located is no more than 90_F (32_C) and

 

possible.

 

 

sprayer is not located in direct sun.

 

 

 

 

 

 

 

 

3.

Check motor.

3.

Replace motor. See page 26.

 

 

 

 

 

Building Circuit Breaker

1.

Check all electrical wiring for damaged insula-

1.

Repair or replace any damaged wiring or

Opens As Soon As Sprayer

 

tion, and all terminals for loose fit or damage.

 

terminals. Securely reconnect all wires.

Switch Is Turned On.

 

Also check wires between pressure control and

 

 

 

 

motor. See page 26.

 

 

 

 

 

 

 

 

2.

Check for missing motor brush inspection plate

2.

Correct faulty conditions.

 

 

gasket (see page 18), bent terminal forks or

 

 

 

 

other metal to metal contact points which could

 

 

 

 

cause a short.

 

 

 

 

 

 

 

 

3.

Check motor armature for shorts. Use an arma-

3.

Replace motor. See page 26.

 

 

ture tester (growler) or perform motor test. See

 

 

 

 

page 18. Inspect windings for burns.

 

 

 

 

 

 

 

 

4.

Check motor start board (47) by substituting

4.

Replace board. See page 27.

 

 

with a good board.

 

 

 

 

CAUTION: Do not perform this check until

 

 

 

 

motor armature is determined to be good. A

 

 

 

 

bad motor armature can burn out a good board.

 

 

 

 

 

 

 

Circuit breaker opens after

1.

Check ‘Basic Problems – Electrical’ on page

 

 

sprayer operates for 5 to 10

 

14.

 

 

minutes.

 

 

 

 

 

 

 

 

 

Building circuit breaker

1.

Check ON/OFF switch (52). Be sure sprayer is

1.

Replace ON/OFF switch. See page 27.

opens as soon as sprayer

 

unplugged! Disconnect wires from switch.

 

 

is plugged into outlet and

 

Check switch with ohmmeter. The reading

 

 

sprayer is NOT turned on.

 

should be infinity with ON/OFF switch OFF,

 

 

 

 

and zero with switch ON.

 

 

 

 

CAUTION: A short in motor circuit can damage

 

 

 

 

switch and or motor start board (47).

 

 

 

 

 

 

 

 

2.

Check electrical supply with volt meter. Meter

2.

If voltage is too high, do not operate

 

 

should read 105–125 VAC.

 

sprayer until corrected.

 

 

 

Unit will not run on gener-

Check the generator’s peak voltage. This sprayer will

Use AC power or a different generator

ator but does run on AC

not run if the peak voltage is above 190V.

 

 

power

 

 

 

 

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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 Pressure Relief ProcedureStartup Procedure Fire and Explosion Hazard 102 Shutdown and Care Shutdown and CareFlushing When to FlushHow to Flush Basic Problem Solving TroubleshootingIntermediate Problem Solving If pump consistently comes to rest with Use AC power or a different generator Armature Short Circuit Test SetupMotor Test Tool List General Repair InformationMotor Brushes Test the brushes Removing the pump See Fig Displacement Pump RepairReassembling the pump Intake valve repair See FigDisassembling the pump See Fig 110 108 107 116 Motor Motor Start Board Power Supply CordOn/Off Switch 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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