Startup; How To Adjust The Spray Pattern; How To Adjust The Trigger Tension; Lubrication - Graco Series A Instruction Manual

WARNING
INJECTION HAZARD
To reduce the risk of a serious injury,
always follow the Pressure Relief Pro-
cedure on page 7 whenever you are
instructed to relieve the pressure.
WARNING
INJECTION HAZARD
To reduce the risk of a fluid injection
injury, do not operate the gun with the tip
guard or trigger guard removed.

Startup

1. Start the pump. Adjust the fluid pressure so the
spray is completely atomized. Always use the
lowest pressure necessary to get the desired
results. Higher pressure may not improve the
spray pattern and will cause premature tip and
pump wear.
2. If adjusting the pressure does not give a good
spray pattern, try another size tip. Relieve the
pressure before changing a spray tip.
3. Use a full-open, full-close trigger action. Hold the
gun about 14 inches (350 mm) from and at right
angles to the work surface. Don't swing the gun in
an arc. Practice to find the best length and speed
of stroke.
1
Fig. 3
8 308–626
Operation
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The spray tip is shown
1
in the vertical position.

How to Adjust the Spray Pattern

1. Relieve the pressure.
2. Loosen the tip guard retaining nut (B).
3. Turn the tip guard/tip groove horizontally(C) for a
horizontal pattern and vertically (A) for a vertical
pattern. Tighten the tip guard retaining nut. See
Fig. 3.
4. The spray tip orifice size and spray angle deter-
mines the coverage and size of the pattern. When
more coverage is needed, use a larger spray tip
rather than increasing the fluid pressure.
CAUTION
The openings in the tip guard are designed to
reduce paint buildup on the guard while spraying.
Any damage to the sharp edges of the openings
causes paint to collect at that area. To avoid dam-
aging the tip guard, do not hang the gun by the tip
guard.

How to Adjust the Trigger Tension

Turn the hex part of the trigger safety (B) in or out to
adjust the trigger tension. See Fig 4.

Lubrication

Oil the exposed part of the valve rod (16) and trigger
pivot (14) daily. See Fig. 4. Whenever you clean the
gun, remove the tension adjusting screw (3), and pull
out the valve rod. See Fig. 6, page 7. Clean and oil the
exposed part of the valve rod all the way back to the
packing screw (20).
Fig. 4
Oil daily at
1
this point.
B
14
1
16
1
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