Determine the Ratio

Set the ratio based on your situation. If :

•The fluids are supplied at a ready–to–spray viscosity, simply set the ratio as explained under Adjusting the Ratio.

•The fluids are NOT supplied at ready–to–spray viscosity, the ratio must be determined after the reducer is added to the base, as instructed in Procedure 1, below.

NOTE: Evaporation of the reducer in the base causes changes in the ratio. To prevent evaporation, store the base in a closed container.

NOTE: Some reducers have very little ability to lubricate and many cause seals to dry out. To prolong the seal life, be sure your pump seals are compatible with the base’s reducer. Contact your Graco representative for the correct seals to use.

Procedure 1: Base is not pre-reduced

When adding the reducer to the base before proportioning with the VRHC system, determine the ratio of the base/reducer mixture to the catalyst in order to set the proper ratio.

Example:

The instructions on the can say “Mix 5 parts base to 1 part catalyst. Then reduce 3 parts of this mixture to 1 part reducer.”

1.Add the parts of the base and catalyst to find the parts mixture.

5parts base

+1 parts catalyst

6parts mixture

Fig. 5

2.The next statement on the can says, “Reduce 3 parts of the mixture.” So divide the parts of the mixture by 3 parts to reduce to find the parts reducer.

6parts mixture

/3 parts to reduce

2parts reducer

3.To determine the ratio of the secondary pump, add the appropriate parts of base and reducer to find the parts combined base/reducer.

5parts base

+2 parts reducer

7parts combined base/reducer to 1 part catalyst

The ratio of the pump is 7:1.

Relationship Between the Primary and Secondary Pumps

Moving the fulcrum point away from the primary pump reduces the secondary stroke length, reducing its fluid output. Moving the fulcrum point closer to the primary pump increases the secondary stroke length, increasing its fluid output.

Fig. 5 shows the relationship between the primary pump and the secondary pump.

Adjusting the Ratio

See Fig. 2. Use a wrench to rotate the ratio adjustment screw (S). Rotating the screw clockwise will increase the ratio. Rotating the screw counterclockwise will decrease the ratio. The indicator pin (V) will move along the ratio indicator scale (U) as the ratio adjustment screw is rotated. When the pin is above the desired ratio, remove the wrench and perform a ratio test as described on page 12.

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Graco 965477, 965478, 965481, 965479, 965466 Determine the Ratio, Procedure 1 Base is not pre-reduced, Adjusting the Ratio
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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.
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