Graco GM 3000 Instructions-Parts List Manual page 15

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