Graco B Series Instructions-Parts List Manual page 9

WARNING
MOVING PARTS HAZARD
Hold the engine starter rope as it recoils
to prevent it from injuring someone, or
jamming in the recoil assembly.
f. Hold the frame of the sprayer with one hand
and pull the starter rope rapidly and firmly.
Continue holding the rope as it returns. Repeat
until the engine starts.
g. Open the choke as soon as the engine starts,
except in cold weather. In cold weather, leave
the choke closed for 10 to 30 seconds before
opening it to keep the engine running.
5. Prime with texture material:
NOTE: If the pump does not prime easily, remove the
suction strainer.
a. Reduce the engine speed.
b. Put the siphon hose (1a) in the prepared
texture material.
c. Set the Easy Spray Control to PRIME to load
the pump. Set the control to SPRAY when
material appears at the drain hose.
d. Trigger the gun and direct the solvent into the
solvent container, then when the texture mate-
rial appears, direct the flow into a material
drum. If you are ready to adjust the spray
pattern, do not release the trigger.
6. Fill the pump:
a. Start the air compressor and adjust the pres-
sure according to the chart on page 9, or to at
least 40 psi (0.28 MPa, 2.8 bar)
b. Set the Easy Spray Control (75) to SPRAY.
c. Trigger the gun for about one minute, directing
the fluid back into the solvent container. (Air
will exit the rear of the gun.) This starts the
pump and wets the hoses.
d. Release the trigger. The system pressure will
be relieved automatically.
7. To adjust the spray pattern:
a. While triggering the gun, adjust the engine
RPM to determine fluid flow and pressure. A
good starting point is to adjust the fluid flow
until you have an 8 in (20 cm) stream.
Startup
b. Hold the gun 18 to 30 in (0.5 to 1.0 m) from a
test surface. Test the spray pattern while
backing out the gun's Air Control Valve (G)
which allows the air to atomize the fluid. Adjust
the Air Control Valve to obtain the desired
spray pattern.
TIP: More fluid flow = more air,
and less fluid flow = less air.
c. If you cannot get a good spray pattern, try
adjusting the air compressor pressure or try
another spray disc and nozzle combination.
8. To prevent material surge at the beginning of a
spray pattern:
a. Always trigger the gun fully.
If triggered partially, which only triggers the air
portion of the system, the pump will start and
pressurize the hoses. Then when you
complete the triggering action you will get a
blast of unatomized material.
b. When you release the gun trigger, allow
the material to completely depressurize
before triggering the gun again.
Failure to do this will result in spraying some
unatomized material, cause material to back
up into the gun air passages and block air flow.
Longer hoses and heavier material may take a
few seconds longer to depressurize.
As you test the spray pattern, also time how
long it takes to depressurize the system and
keep that in mind as you are working.
Fig. 8
Use the lowest fluid pressure and the lowest
throttle setting needed. Higher settings cause
excessive drain time from the dump valve and
premature seal wear.
9. When you stop spraying release the gun trigger
to relieve pressure. Shut off the sprayer.
G
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CAUTION
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