Graco Magnum SR7 Operation page 26

Problem
Pressure is set at maximum but
cannot achieve a good spray pattern.
When paint is sprayed, it runs down
the wall or sags.
When paint is sprayed, coat is not
covering.
Motor is hot and runs intermittently.
This is NOT a thermal overload con-
dition. Motor automatically shuts off
due to excessive heat. Damage can
occur if cause is not corrected.
Thermal Overload, page 4.
26
Cause
Spray tip is too large 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.
InstaClean fluid filter is clogged.
Inlet screen is clogged.
Pump valves are worn.
Material is too thick.
Hose
is too long (if extra section is
added).
Coat is going on too thick.
Coat is going on too thin.
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.
Troubleshooting
Solution
Select smaller spray tip.
Replace spray tip.
Replace extension cord. Grounding
and Electrical Requirements, page 4.
Clean or replace spray gun fluid filter,
page 21.
Clean or replace InstaClean fluid
filter, page 21.
Clean debris off inlet screen.
Check for worn pump valves.
a. Prime sprayer with paint
b. Trigger gun momentarily.
When trigger is released,
pump should cycle momen-
tarily and stop. If pump con-
tinues to cycle, pump valves
may be worn.
Thin material.
Remove section of hose.
Move gun faster.
Choose a tip with smaller hole size.
Choose tip with wider fan.
Make sure gun is far enough from
surface.
Move gun slower.
Choose tip with larger hole size.
Choose tip with narrower fan.
Make sure gun is close enough to
surface.
Keep vent holes clear of obstructions
and overspray and keep sprayer
open to air.
Replace extension cord. Read
Grounding and Electrical
Requirements, page 4.
Use electrical generator with a proper
voltage regulator. Sprayer requires
120VAC, 60 Hz, 1500-Watt
generator.
Decrease pressure setting or
increase tip size.
311984A