Graco A Series Instructions-Parts List Manual page 24

WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury, including
fluid injection, injury from splashing fluid or solvent
in the eyes or on the skin, moving parts or electric
shock, always follow this procedure whenever you
shut off the sprayer, when checking or servicing any
part of the spray system, when installing, cleaning
or changing spray tips, and whenever you stop
spraying.
1. Engage the gun safety latch.
2. Turn the ON/OFF switch to OFF.
3. Unplug the power supply cord.
4. Disengage the gun safety latch. Hold a metal
part of the gun firmly to the side of a grounded
metal pail, and trigger the gun to relieve pres-
sure.
5. Engage the gun safety latch.
6. Open the pressure drain valve, having a con-
tainer ready to catch the drainage. Leave the
pressure drain valve open until you are ready to
spray again.
If you suspect that the spray tip or hose is com-
pletely clogged, or that pressure has not been fully
relieved after following the steps above, wrap a rag
around the tip guard retaining nut or hose end cou-
pling and VERY SLOWLY loosen the part to relieve
pressure gradually , then loosen completely . Now
clear the tip or hose obstruction.
Tool List
Phillips screwdriver
Small flat blade
screwdriver
Needle nose pliers
Plastic mallet
Adjustable wrench
2" adjustable wrench
Torque wrench
1/4" hex key wrench
1. When disconnecting wires in the pressure control
assembly, use needle nose pliers to separate mating
connectors.
When reconnecting the wires, be sure the flat
blade of the insulated male connector is centered in
the wrap–around blade of the female connector.
307–958
GENERAL REPAIR NOTES
3/16" hex key wrench
5/8" socket wrench
3/8" open end wrench
1/2" open end wrench
3/4" open end wrench
7/8" open end wrench
High quality motor oil
Bearing grease
CAUTION
To reduce the risk of a pressure control malfunction,
be sure to properly mate connectors, and never pull
on a wire to disconnect it. Pulling on a wire could
loosen the connector from the wire.
2. Route wires carefully in the pressure control as-
sembly, guiding them through the legs of the U–
shaped bourdon tube. This is to avoid interfering with
the bourdon tube, which moves as the pressure set-
ting changes, and to avoid pinching the wires be-
tween the pressure control and cover.
CAUTION
Improper wire routing can result in poor sprayer per-
formance or damage to the pressure control.
3. Keep all screws, nuts, washers, gaskets, and
electrical fittings removed during repair proce-
dures. These parts are not normally provided with re-
placement assemblies.
4. Test your repair before regular operation of the
sprayer to be sure the problem is corrected.
If the sprayer does not operate properly , review
the repair procedure again to verify that everything
was done correctly . If necessary , refer to the
Troubleshooting Guide, pages 16–21, to help iden-
tify other possible problems and solutions.
WARNING
To reduce the risk of serious bodily injury, including
electric shock, DO NOT touch any moving parts or
electrical parts with your fingers or a tool while in-
specting the repair.
Shut off the sprayer and unplug it as soon as you
complete the inspection.
Reinstall all covers, gaskets, screws and washers
before operating the sprayer.
CAUTION
Do not run the sprayer dry for more than 30 seconds
to avoid damaging the pump packings.
5. Reinstall the motor cover before regular opera-
tion of the sprayer and replace it if it is damaged. The
cover directs cooling air around the motor to help pre-
vent overheating. It can also help reduce the risk of
burns, fire or explosion; see the WARNING, below.
WARNING
During operation, the motor becomes very hot and
could burn your skin if touched. Flammable materi-
als spilled on the hot, bare motor could cause a fire
or explosion. Always have the motor cover in place
during regular operation to reduce the risk of burns,
fire or explosion.