Graco 3A2497BPro User Manual download pdf (Page 44)

Troubleshootin

Gun Operation

Troubleshooting

Problem

Cause Solution

Atomizing air

pressure too high.

Close atomizing air valve part way,

or decrease air pressure as low

as possible; minimum 45 psi (0.32

MPa, 3.2 bar) needed at gun for

full voltage.

Excessive spray fog.

Fluid too thin. Increase viscosity.

Atomizing a

ir pressure too low.

Open atomizing air valve more or

increase gun air inlet pressure;

use lowest air pressure necessary.

Spray tip

is too large.

Use small

er tip. See Spray Tip

Selectio

n Chart, page 71.

Poorly mixed or ﬁltered ﬂuid. Remix or reﬁlter ﬂuid.

“Orange Peel” ﬁnish.

Fluid to

o thick.

Reduce v

iscosity.

Fluid leaks from the ﬂuid packing

area.

Worn ﬂuid needle packings or rod. See Fluid Needle Replacement,

page 51.

Air leaks from the front of the gun.

Air val

ve is not seating properly.

See Air Valve Repair, page 57.

Worn o

r damaged ﬂuid needle ball.

See Fl

uid Needle Replacement,

page 5

Worn ﬂuid seat housing. See Air Cap, Spray Tip, and Fluid

Seat Housing Replacement, page

48.

Loo

se spray tip.

Tig

hten retaining ring.

Fluid

leakage from the front of the

gun.

Damaged tip seal.

See Air Cap, Spray Tip, and Fluid

Seat Housing Replacement, page

48.

Low ﬂuid supply. Add ﬂuid if necessary.

Damaged spray tip. Replace.

irty or clogged spray tip.

Clean. See

Clean the Gun Daily, page 33.

Gun does not spray.

Damaged ﬂuid needle. See Fluid Needle Replacement,

page 51.

Dirty air cap. Damaged or plugged air cap.

Clean air cap. See

Clean the Gun Daily, page 33.

Poor grounding.

See Grounding, page 21.

Excessive paint wrap back to

operator.

Incorrect distance from gun to part. Should be 8–12 in. (200–300 mm).

3A2497B

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Graco 3A2497BPro User Manual Page 44

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