Graco 16N664, Operation - Repair - Parts

Getting Started with Basic Techniques 

14

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Aiming Sprayer

Aim sprayer at bottom edge of previous stroke, overlapping 
each stroke by half.

Spray Pattern Quality

A good spray pattern is evenly distributed as it hits the sur
face. Adjust pressure control knob so pressure is just high 
enough to spray without “tails”. If tails persist at highest 
pressure setting, a smaller tip is needed to spray the mate
rial or material may need to be thinned. 

Unclogging Spray Tip/Guard 
Assembly

1.

To unclog spray tip clog, engage trigger lock and put 
prime/spray valve UP to release pressure.

2.

Reverse spray tip to UNCLOG position. Turn pressure 
control knob to maximum pressure setting. 

3.

Aim sprayer at waste area, disengage trigger lock, and 
put prime/spray valve DOWN to spray position. Pull 
trigger to clear clog.

4.

Engage trigger lock. Put prime/spray valve UP to 
release pressure and rotate spray tip back to SPRAY 
position.

5.

Disengage trigger lock, put prime/spray valve DOWN 
to spray position, and resume spraying.

6.

If spray tip is still clogged, you may have to repeat 
steps 1 - 5 and rotate the spray tip from SPRAY to 
UNCLOG several times. Repeat step 1 to release 
pressure, remove and clean spray tip filter, or replace 
with new spray tip/guard assembly. 

NOTE: 

Spray tip filter assembly is reverse-threaded:

Turn left

 (or counter-clockwise) to install.

Turn right 

(or clockwise) to remove.

7.

When obstruction is cleared, engage trigger lock and 
rotate spray tip back to SPRAY position.

Do not operate or spray near children. Do not aim the 
sprayer at, or spray any person or animal. Keep hands 
and other body parts away from discharge. For 
example, do not try to stop leaks with any part of the 
body.

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BAD PATTERN

GOOD PATTERN

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NOTICE

Make sure spray tip filter is completely screwed into the 
spray/tip guard assembly to avoid damage to the filter. 
Do not use a damaged filter or poor sprayer performance 
may result.

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