Startup - Graco 231–373 Instructions-Parts List Manual

Use this procedure each time you start the sprayer to
help ensure the sprayer is ready to operate and that you
start it safely.
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
follow the illustrated Pressure Relief
Procedure warning on page 13 when-
ever you are instructed to relieve pressure.
NOTE: Flush the sprayer if this is a first-time startup.
See page 12.
NOTE: See Fig. 4 except where noted.
1. Put the suction tube into the paint container.
2. Turn the pressure adjusting knob fully coun-
terclockwise to zero pressure.
3. Plug in the sprayer.
CAUTION
Do not run the pump without fluid in it for more than
30 seconds to avoid damage to the displacement
pump packings.
WARNING
FIRE AND EXPLOSION HAZARD
To reduce the risk of static sparking and
splashing when flushing, always remove
the spray tip from the gun and hold a
metal part of the gun firmly to the side of a
grounded metal pail.
4. Prime the pump.
a. Open the pressure drain valve (handle in down-
ward position). If you did not install a secondary
hose, be sure the nipple is tightly plugged with
the cap provided. T urn the ON/OFF switch to
ON. Slowly turn the pressure adjusting knob
clockwise until the sprayer starts. When
comes from the drain hose, close the valve (han-
dle in forward position).
b. Disengage the gun safety latch. See Fig. 3.
Following the warning, above, trigger the gun
until all air is forced out of the system and the
paint flows freely from the gun.

Startup

c. Release the trigger. Engage the gun safety latch.
5. Check all fluid connections for leaks. Relieve
the fluid pressure before tightening connections.
6. Install the spray tip and tip guard. Engage the
gun safety latch. See Fig. 3. Install the spray tip
according to the instructions supplied with it.
7. Adjust the spray pattern.
a. Increase the pressure just until spray from the
gun is completely atomized. Use the lowest
pressure needed to get the desired results. This
reduces overspray and fogging, decreases tip
wear and extends the life of the sprayer.
b. If more coverage is needed, use a larger tip
rather than increasing the pressure.
c. Test the spray pattern. T o adjust the pattern,
engage the gun safety latch, 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.
Fig. 3
ON/OFF SWITCH
fluid
Fig. 4
GUN SAFETY
LATCH SHOWN
ENGAGED
GUN SAFETY LATCH
SHOWN DISENGAGED
PRESSURE ADJUSTING KNOB
OUTLET NIPPLE
DRAIN HOSE
PRESSURE
DRAIN
VALVE