Basic 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

 

 

 

Electrical (continued)

5. Check motor armature commutator for burn

5. Remove motor and have motor shop

 

spots, gouges and extreme roughness. Re-

resurface commutator if possible. See

 

move motor cover and brush inspection plates

page 26.

 

to check. See page 20.

 

 

 

 

6.Check motor armature for shorts using arma- ture tester (growler) or perform motor test. See page 18.

6. Replace motor. See page 26.

7.

Check leads from pressure control and motor to

7.

Replace loose terminals; crimp to leads.

 

motor start board (47) to be sure they are se-

 

Be sure male terminal blades are straight

 

curely fastened and properly mated.

 

and firmly connected to mating part.

 

 

 

 

8.

Check motor start board (47) by substituting

8.

Replace board. See page 27.

 

with a good board. See page 27.

 

 

 

CAUTION: Do not perform this check until mo-

 

 

 

tor armature is determined to be good. A bad

 

 

 

motor armature can burn out a good board.

 

 

 

 

 

 

9.

Check power supply cord (50). Disconnect

9.

Replace power supply cord. See page

 

black and white power cord terminals; connect

 

27.

 

volt meter to these leads. Plug in sprayer. Meter

 

 

 

should read 105–125VAC. Unplug sprayer.

 

 

 

 

10. Check ON/OFF switch (52). Disconnect the

10. Replace ON/OFF switch. See page 27.

 

motor start board (47) and switch and connect

 

 

 

volt meter between exposed terminal on switch

 

 

 

and power cord’s white wire. Plug in sprayer

 

 

 

and turn ON. Meter should read 105–125VAC

 

 

 

Turn off and unplug sprayer.

 

 

 

 

 

 

11.

Check motor thermal cutout switch. Connect

11.

Allow motor to cool. Correct cause of

 

ohmmeter between motor’s red leads. Meter

 

overheating. If switch remains open after

 

should read 1 ohm maximum.

 

motor cools, replace motor.

 

 

12. Remove pressure control (64) and check mi-

12. Replace pressure control. See page 30.

 

croswitch operation with ohmmeter:

 

 

(1)With pressure knob at lowest setting and stem pushed into control, readings should be: white & black = 1 ohm max.

white & red = open.

(2)With pressure knob at highest setting,read- ings should be: white & black = open; white & red = 1 ohm max.

 

13. Check pressure transducer (29) for hardened

13. Replace transducer. See page 31. Thor-

 

paint or damaged or worn components. See

ough system flushing will help extend life

 

page 31.

of transducer.

Intermediate Problem Solving

TYPE OF PROBLEM

WHAT TO CHECK

If check is OK, go to next check

WHAT TO DO

When check is not OK refer to this column

Low output

1. Check for worn spray tip.

1.Follow Pressure Relief Procedure then replace tip. See your separate gun or tip manual.

2.Be sure pump does not continue to stroke when gun trigger is released. Plug in and turn on sprayer. Prime with paint. Trigger gun mo- mentarily, then release and lock safety latch. Relieve pressure, turn off and unplug sprayer.

2. Service pump. See page 22.

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Graco Inc 390sts, 308-548, 231-353 manual Intermediate Problem Solving
Page 14 Page 16

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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