Graco EM 490 Instructions-Parts List Manual page 7

8. Install the spray tip and tip guard. If the system is
pressurized, follow the PRESSURE RELIEF PRO-
CEDURE on page 2. Be sure the gun safety latch is
engaged. See Fig 7. Install the spray tip. Refer to the
instructions supplied with the tip guard.
8. Install the spray tip and tip guard. If the system is
pressurized, follow the PRESSURE RELIEF PRO-
CEDURE on page 2. Be sure the gun safety latch is
engaged. See Fig 7. Install the spray tip. If using the
RAC IV tip guard, refer to manual 307–848, supplied,
for installation instructions.
9. Adjust the spray pattern
a. Increase the pressure just until spray from the
gun is completely atomized. To avoid excessive
overspray and fogging, and to decrease tip wear
and extend the life of the sprayer, always use the
lowest possible pressure needed for good
atomization.
b. If more coverage is needed, use a larger tip rather
than increasing the pressure.
c. To adjust the direction of the spray pattern, en-
gage the gun safety latch and loosen the retaining
nut. Position the tip guard horizontally for a hori-
zontal pattern or vertically for a vertical pattern.
Then tighten the retaining nut.
HANDLE SHOWN IN NORMAL SPRAYING
POSITION. ROTATE ARROW HANDLE 180
TO CLEAR.
Fig 7–7
OPERATION
TIP GUARD
RETAINING NUT
GUN SAFETY LATCH
SHOWN IN "SAFE" OR EN-
GAGED POSITION
0118
Cleaning a Clogged Tip
WARNING
To reduce the risk of serious bodily injury from fluid
injection;
NEVER operate the spray gun with the tip guard
removed.
DO NOT hold your hand, body, or a rag in front of the
spray tip when cleaning or checking a clogged tip.
Always point the gun toward the ground or into a pail
when checking to see if the tip is clear.
DO NOT try to "blow back" paint; this is NOT an air
spray sprayer.
1. Clean the front of the tip frequently during the day' s
operation. Follow the PRESSURE RELIEF PROCE-
DURE on page 2. Use a solvent–soaked brush to
clean the tip.
2. If the spray tip clogs, release the gun trigger, engage
the gun safety latch, and rotate the RAC IV handle
180 so the arrow is pointing back. See Fig 7.
3. Disengage the gun safety latch and trigger the gun
into a grounded metal pail. Engage the gun safety
latch again.
4. Return the arrow handle to the normal spraying posi-
tion, disengage the gun safety latch, and resume
spraying.
5. If the tip is still clogged, engage the gun safety latch,
shut off and unplug the sprayer, and open the pres-
sure drain valve to relieve pressure. Remove and
clean the spray tip as shown in manual 307–848,
supplied.