Graco MAGNUM 232738 Repair Manual page 10

Problem
Spray pattern is inconsistent or
is leaving stripes
Pressure is set at maximum
but cannot achieve a good
spray pattern
Motor is hot and runs
intermittently.
This is NOT a thermal overload
condition. Motor automatically
shuts off due to excessive heat.
Damage can occur if cause is
not corrected.
Thermal Overload, page 7.
Building circuit breaker opens
after sprayer operates for 5 to
10 minutes.
Fan pattern varies dramatically
while spraying
OR
Sprayer does not turn on
promptly when resuming
spraying
Cannot trigger spray gun
Spray comes out of spray gun
in two thick streams
Paint is coming out of pressure
control switch
Spray-PRIME valve actuates
automatically relieving
pressure through drain tube
Paint leaks down outside of
pump
10
Cause
Pressure is set too low
Spray tip is worn beyond
capability of sprayer
Spray tip is too big for sprayer
Spray tip is worn beyond
capability of sprayer
Extension cord is too long or
not heavy enough gauge
Spray gun fluid filter is clogged Clean or replace spray gun fluid filter.
InstaClean fluid filter is clogged
(XR9 only)
Inlet screen is clogged
Pump valves are worn
Vent holes in enclosure are
plugged or sprayer is covered
Extension cord is too long or
not a heavy enough gauge
Unregulated electrical
generator being used has
excessive voltage
Sprayer was operated at high
pressure with very small tip
which causes frequent motor
starts and excessive heat build
up
Too many appliances are
plugged in on same circuit.
Sprayer electrical cord is
damaged.
Pressure control switch is worn
and causing excessive
pressure variation
Spray gun trigger safety lever is
in SAFETY ON position
Reversible spray tip is in
UNCLOG position
Pressure control switch is worn Replace pressure control using Pressure Control
System is over pressurizing
Pump packings are worn
Solution
Turn pressure control knob clockwise to increase
pressure.
Replace spray tip.
Select smaller spray tip.
Replace spray tip.
Replace extension cord. Grounding and
Electrical Requirements, page 7.
Clean or replace InstaClean fluid filter.
Clean debris off inlet screen.
See Low or Fluctuating Output, page 15.
Keep vent holes clear of obstructions and
overspray and keep sprayer open to air.
Replace extension cord. See Grounding and
Electrical Requirements, page 7.
Use electrical generator with a proper voltage
regulator. Sprayer requires 220-240 VAC, 50/60
Hz, 1500-Watt generator.
Decrease pressure setting or increase tip size.
Free up circuit (unplug things), or use a less busy
circuit.
Check broken insulation or wires. Replace
electrical cord if damaged.
Replace pressure control knob using Pressure
Control Switch Kit, page 18.
Rotate trigger safety lever to SAFETY OFF
position.
Rotate arrow-shaped handle on spray tip so it
points forward in SPRAY position.
Switch Kit, page 18.
See Excessive Pressure Build Up, page 17.
Replace pump packings. See Pump Service,
page 20.
Basic Troubleshooting
309477F