Graco Inc 390sts, 308-548, 231-353 manual Motor Test, Setup, Armature Short Circuit Test

Page 18

Motor Test

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.

For checking armature, motor winding and brush elec- trical continuity.

Setup

Remove the drive housing. See page 28. This is to ensure that any resistance you notice in the armature test is due to the motor and not to worn gears in the drive housing.

Remove the motor brush inspection covers (A). See Fig. 12.

Remove the junction box screws (56). Lower the junc- tion box. Disconnect the two leads (C) from the motor to the board (47). See Fig. 13.

Armature Short Circuit Test

Remove the fan cover (B). See Fig. 12.

Spin the motor fan by hand. If there are no shorts, the motor will coast two or three revolutions before coming to a complete stop. If the motor does not spin freely, the armature is shorted and the motor must be re- placed. See page 26.

Armature, Brushes, and Motor Wiring Open Circuit Test (Continuity)

Connect the two black motor leads together with a test lead. Turn the motor fan by hand at about two revolu- tions per second.

When turning the fan on a DC motor, normally you sense an even, pulsing resistance. If there is irregular turning resistance, or no turning resistance, check and

B

A

Fig. 12

￿4652

MOTOR

89

 

BLACK/

 

 

WHITE

 

 

BLACK

 

59

C

 

 

 

58

RED

 

repair the following as needed: broken brush springs, brush leads, motor leads; loose brush terminal screws or motor lead terminals; worn brushes. See page 20.

47

56

If there is still uneven or no turning resistance, replace the motor. See page 26.

Fig. 13

￿472￿

1￿￿ ￿￿￿￿￿￿￿

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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 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 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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