Graco Inc 231-353, 390sts, 308-548 manual Troubleshooting, Basic Problem Solving

Page 14

Troubleshooting

WARNING

INJECTION HAZARD

To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pressure Relief Procedure on page 9.

Basic Problem Solving

Check everything in the troubleshooting table before disassembling the sprayer.

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

Fluid pressure

1.Check pressure control knob setting. The pump won’t develop much pressure if it is at minimum setting (fully counterclockwise).

1.Slowly increase pressure setting to see if motor starts.

2.Check for a clogged spray tip or fluid filter, if used. See page 8.

2.If tip is still clogged, relieve pressure; re- fer to separate gun or tip instruction man- ual for tip cleaning. Clean the filter, if used.

Mechanical

1.

Check for frozen or hardened paint in pump

1.

Thaw. Plug in sprayer and turn on.

 

 

(20). Using a screwdriver, carefully try to rotate

 

Slowly increase pressure setting to see if

 

 

fan at back of motor by hand. See page 18.

 

motor starts. If it doesn’t, see NOTE, be-

 

 

 

 

low.

 

 

 

 

 

 

2.

Check pump connecting rod pin (17). It must be

2.

Push pin into place and secure with

 

 

completely pushed into connecting rod (15),

 

spring retainer.

 

 

and retaining spring (18) must be firmly in con-

 

 

 

 

necting rod groove. See Fig. 18, page 22.

 

 

 

 

 

 

 

 

3.

Check for motor damage. Remove drive hous-

3.

Replace motor (4) if fan won’t turn. See

 

 

ing assembly (11). See page 28. Try to rotate

 

page 26.

 

 

motor fan by hand.

 

 

 

 

 

 

 

Electrical

1.

Check electrical supply with volt meter. Meter

1.

Reset building circuit breaker; replace

 

 

should read 105–125 VAC.

 

building fuse. Try another outlet.

 

 

 

 

 

 

2.

Check extension cord for visible damage. Use

2.

Replace extension cord.

 

 

a volt meter or test lamp at extension cord out-

 

 

 

 

let to check.

 

 

 

 

 

 

 

 

3.

Check sprayer power supply cord (50) for vis-

3.

Replace power supply cord.

 

 

ible damage such as broken insulation or wires.

 

See page 27.

 

 

 

 

 

 

4.

Check motor brushes for the following:

4.

Refer to page 20.

 

 

a. Loose terminal screws.

 

a. Tighten.

 

 

b. Broken or misaligned brush springs.

 

b. Replace broken spring and/or align

 

 

 

 

spring with brush

 

 

c. Brushes binding in holders.

 

c. Clean brush holders. Remove carbon

 

 

 

 

with small cleaning brush. Align brush

 

 

 

 

leads with slot in brush holder to as-

 

 

 

 

sure free vertical brush movement.

 

 

d. Broken leads.

 

d. Replace brushes

 

 

e. Worn brushes.

 

e. Replace brushes if less than 0.5 in.

 

 

NOTE: The brushes do not wear at same rate

 

long.

 

 

on both sides of motor. Check both brushes.

 

 

NOTE: Thaw sprayer if water or water–based paint has frozen in it, due to exposure to low temperatures, by placing in a warm area. Do not try to start sprayer until completely thawed or damage to motor and/or start board may occur. If paint hardened (dried) in sprayer, the pump packings (page 22) and/or pressure transducer (page 31) must be replaced.

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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 pressure control How to Use the Gun Trigger SafetyHow to use the pressure drain valve OperationHow to use the RAC IV tip guard How to remove a tip clogStartup Pressure Relief ProcedureStartup Procedure Fire and Explosion Hazard 102 Shutdown and Care Shutdown and CareFlushing When to FlushHow to Flush Troubleshooting Basic Problem SolvingIntermediate Problem Solving If pump consistently comes to rest with Use AC power or a different generator Armature Short Circuit Test SetupMotor Test General Repair Information Tool ListMotor Brushes Test the brushes Displacement Pump Repair Removing the pump See FigReassembling 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 Inlet Strainer Installation/Removal Drain ValveModel 236-787, Series a Displacement Pump Parts Drawing and ListAccessories Fluid Filter Kit Low Profile Cart KitSprayer Parts Drawing Model 231-353, Series aSprayer Parts List Motor KITGraco Warranty and Disclaimers Technical DataDimensions 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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