Graco 965466, 965477, 965478, 965481, 965479 manual Troubleshooting Techniques

Page 14

Troubleshooting

Troubleshooting Techniques

Because the pumps are mechanically linked, the action of one pump can affect the readings of the second pump. Therefore, the key to successful troubleshooting is to be

sure to isolate the problem.

For example, if the secondary pump pressure, as read on the gauge, is low and sluggish during the pump changeover. The most likely problem is a binding primary pump. To isolate the problem:

1.Relieve the pressure.

2.With the sampling valves still open, set the air supply regulator to the lowest setting and open the bleed- type main air valve (1). Refer to figure 6. Increase the regulator setting until the pump just begins to move. Notice the position of the secondary pump (11). Turn off the bleeder-type main air valve (1) so that the secondary pump rod is at its lowest position when the pump stops.

WARNING

To reduce the risk of a serious injury, always follow the Pressure Relief Procedure on page 11 whenever you are instructed to relieve the pressure.

3.With the main bleed-type air valve (1) off, remove the thumb screws (14) and guards (15) from each side of the proportioner.

4.Unscrew the connecting rod nut (11) from the secondary pump. Now you can verify the operation of the primary pump alone.

Reinstall the guards (15) on both sides of the proportioner. Turn the main air valve (1) back on and carefully increase the air pressure.

5.Using the sampling valves at the mixer manifold:

A.Open and close the sampling valves and check for pump stalling on both the up and down strokes.

B.Check for rapid gauge response during the pump changeover

6.When the operation of the primary side has been verified, reconnect the connecting rod (11) of the secondary.

7.With the sampling valves still open, set the air supply regulator to the lowest setting and open the bleed- type main air valve (1). Increase the regulator setting until the pump just begins to move. Notice the position of the primary pump. Turn off the bleeder- type main air valve (1) so that the primary pump rod

(10)is at its lowest position when the pump stops.

8.With the main bleed-type air valve (1) off, remove the thumb screws (14) and guards (15) from each side of the proportioner.

9.Unscrew the connecting rod nut (10) from the primary pump. Now you can verify the operation of the secondary pump alone.

Reinstall the guards (15) on both sides of the proportioner. Turn the main air valve (1) back on and carefully increase the air pressure.

10.Using the sampling valves at the mixer manifold:

A.Open and close the sampling valves and check for pump stalling on both the up and down strokes.

B.Check for rapid gauge response during the pump changeover

11.When the operation of the secondary side has been verified, reconnect the connecting rod (10) of the primary pump.

WARNING

Use very low air pressure to the air motor when troubleshooting the system. This system can produce very high fluid pressure, which can cause serious injury,

including injection, splashing in the eyes or on the skin, and injury from moving parts.

To reduce the risk of a serious injury, always follow the Pressure Relief Procedure on page 11 if the problem you are checking does not require air.

WARNING

To reduce the risk of injuring or amputating your hands, fingers, or other body parts, never place your hands, body or tools inside the safety panels for any reason while the unit is operating.

14 684025

Page 13 Page 15
Image 14
Page 13 Page 15
Contents Graco INC Revision EMoving Parts Hazard MINNEAPOLIS, MNTable of Contents Plural Component Fluid Hazard SymbolsDefinition of Terms Fire and Explosion Hazard Equipment Misuse HazardInjection Hazard Specifications of Hydra-Cat H.P. Pumps InstallationPressure Relief Valve System AccessoriesConnect the Air Supply Line Electrical Grounding Ratio Adjustment TermsDetermine the Ratio Procedure 1 Base is not pre-reducedAdjusting the Ratio Relationship Between the Primary and Secondary PumpsSystem Flushing Pressure Relief ProcedureOperation Start the PumpPump Lubrication Wet Cups MaintenanceChecking the Ratio BearingsAir Lubrication KEYTroubleshooting Troubleshooting TechniquesTroubleshooting Chart Problem Cause SolutionRequired Tools ServiceDisconnecting the Displacement Pumps Reconnecting the Displacement Pump Disconnecting the Air MotorReplacing the Bearings King Air Consumption DimensionsPremier Air Consumption Page Technical Data Carbon Steel ModelsGraco Standard Warranty

965466, 965479, 965481, 965478, 965477 specifications

The Graco 965466, 965477, 965481, 965478, and 965479 are part of Graco's robust line of paint sprayers, designed with durability, efficiency, and ease of use in mind. Each model features advanced technologies that cater to both professionals and DIY enthusiasts, ensuring a clean, even finish in a variety of painting applications.

At the heart of these models is the Graco ProConnect system, which allows for quick and easy changes of the pump. This innovative feature minimizes downtime during projects, providing users with a seamless painting experience. The pumps are designed to handle a wide range of materials, from thin coatings to thicker paints, broadening their usability across diverse surfaces and project requirements.

One of the standout technologies in these models is the SmartControl system. This technology delivers a consistent spray fan throughout the pressure range, eliminating the frustrations of uneven paint application. The adjustable pressure control allows users to tailor the flow to their specific needs, leading to better coverage and fewer material waste.

These sprayers are equipped with a powerful electric motor, which ensures reliable operation on even the toughest jobs. The robust construction of each model guarantees longevity, making them a wise investment for those who frequently tackle painting tasks. Additionally, the lightweight design of these sprayers means they can be easily transported between job sites.

Another significant feature is the Graco FinishPro guard system, which helps maintain the integrity of the spray tip and provides improved spraying performance. This system extends the life of the tip while ensuring that the paint is delivered with precision and accuracy.

Each of the Graco models offers ergonomic designs, ensuring that users work comfortably over extended periods. Features such as padded grips and adjustable handles contribute to enhanced user experience, reducing fatigue during large projects.

Finally, all models come with Graco's standard two-year warranty. This provides peace of mind to users, knowing they are backed by a reputable manufacturer committed to quality and customer satisfaction.

In summary, the Graco 965466, 965477, 965481, 965478, and 965479 paint sprayers are engineered for superior performance, featuring innovations like the ProConnect system, SmartControl technology, and durable construction that meet the demands of varying painting tasks. Whether for professional contractors or enthusiastic DIYers, these sprayers offer the reliability and efficiency needed for a flawless finish.
Top Page Image Contents