Graco GM 3000 Instructions-Parts List Manual page 15

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PROBLEM
The pump output is low on
the upstroke.
The output of the pump is
low
on
the downstroke or on
both
of the strokes.
The paint leaks into the wet-
cup.
The fluid delivery is low.
Fluid is spitting from the gun.
The pump is difficult to prime
CAUSE
The inlet screen (102) is clogged.
SOLUTION
Clean the screen.
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A piston ball (121) is not seating.
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Sewice the piston balkheck. See p a g c 1
The piston packings are worn or damaged.
A
o-ring (119) in the displacement pump is
worn or damaged.
The inlet screen (39) is clogged.
The piston packings are worn or damaged.
An intake valve ball is not seating
vroperly.
Replace the packings. See page 32.
Replace the o-ring. See page 32.
Clean the screen.
Replace the packings. See page 32.
Clean the intake valve. See page 32.
The engine speed is too low. Increase the throttle setting. See Step 11, page
110.
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The clutch is worn or damaged.
Tighten the wetcup just enough to stop leak- The wetcup
i s
loose.
Replace the clutch. See page 25.
age.
The throat packings is worn
or
damaged.
Clean the screen. The inlet screen (39) is clogged.
Replace the rod. See page 32. A displacement rod is worn or damaged.
Replace the packings. See page 32.
The pressure setting is too low.
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Increase the Dressure. See SteD 11. Daae 10.
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The engine speed is too low.
Clean the filter. See page 13. Or, see the gun The fluid filter (21), the tip filter or the tip is
Increase the throttle setting. See Step 11, page
clogged or dilly.
instruction manual.
There is a large pressure drop in the hose. Use a larger diameter hose.
There is air in the pump or the hose. Check and tighten all the fluid connections.
10.
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Reprime the pump. See page 10.
The tip is paltially clogged. Clear the tip. See the gun instruction manual.
The fluid supply is low or empty.
There is air in the pump or the hose.
Refill the fluid supply. Prime the pump. See
page 9. Check the fluid supply often to pre-
vent running the pump dry.
as slowly as possible during priming.
Reduce the engine speed and cycle the pump
The intake valve is leaking.
Clean the intake
nicked or worn and that the ball seats well.
Reassemble the valve.
The pump packings are worn.
Thin the paint according to the supplier's
The paint is too thick.
Replace the pump packings. See page 32.
recommendations.
The engine speed is too high,
Decrease the throttle setting before priming the
pump. See Step 7 , page 10.
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