Graco EM 490 Instructions-Parts List Manual page 12

PROBLEM
Paint leaks into wet–cup
Excessive surging from spray gun Spray tip is plugged.
Not enough paint pressure
Tails or fingers in spray pattern
Paint runs or sags
Spitting from gun
Static sparking from the gun
1
The electric motor has an over–temperature switch
which automatically resets upon cooling. If it opens and
the electric motor shuts itself off, unplug the power supply
cord and let the sprayer cool for 30 to 60 minutes. Always
use the lowest pressure setting needed when spraying.
2
Freezing results from failure to replace the water–base
paint or flushing water with mineral spirits, and usually
causes permanent damage to the pressure control.
CAUSE
Throat packings are worn or damaged.
Spray tip too big or worn.
Paint too viscous.
Wrong type hose.
Pressure setting too low.
Spray tip too big or worn.
2
Pressure control frozen or damaged by
3.
overpressurization
Displacement pump worn or damaged.
Pressure setting too low.
Spray tip too big or worn.
Fluid supply is low or empty.
Paint too viscous.
Wrong type hose.
Spray tip to big or worn.
Air in fluid pump or hose.
Spray tip is partially clogged.
Fluid supply is low or empty.
Spray or work being sprayed is not prop-
erly grounded.
SOLUTION
Replace the packings. See page 19.
Disassemble and clean.
Change the spray tip.
Thin the paint.
Use minimum 15 m (50 ft) grounded, flexible
hose (wire braid hose is unacceptable).
Increase the pressure.
Change the spray tip.
2
Try to thaw , or replace the pressure control.
Replace the displacement pump. See page 19.
Increase the pressure.
Change the spray tip.
Refill and prime the pump. Check fluid supply of-
ten to prevent running the pump dry.
Thin the paint.
Use minimum 15 m (50 ft), grounded,
hose (wire braid hose is unacceptable).
Change the spray tip.
Check for loose connections at pump intake and
tighten. Then prime the pump.
Clear the tip. See page 7.
Refill and prime the pump. Check fluid supply of-
ten to prevent running the pump dry.
Correct problem before continuing. Follow the
warning section, FIRE OR EXPLOSION HAZ-
ARD on page 3.
3
Over–pressurization results from (1) using less than
15 m (50 ft) of flexible spray hose, (2) from using a wire
braid spray hose, (3) from adding a
tween the pump outlet and the spray gun, or (4) from at-
taching a spray hose to the pressure drain valve.
flexible
shutoff device be-