Graco Falcon A Series Instructions Manual page 13

PROBLEM
Continuous air exhaust
from muffler.
Continuous air exhaust
from pilot valve vent
holes.
Air motor not shifting
properly; erratic opera-
tion/stalling.
Air leaking from base vent
hole.
Fluid leaking from base
vent hole.
Troubleshooting
CAUSE
Worn or damaged motor piston o-ring (32).
Air cup (7) not seating properly, or damaged. Inspect; reseat or replace. See page 24.
Worn or damaged carriage spool
u-cups (3c).
Worn or damaged actuator valve pin o-rings
(23).
Worn or damaged actuator valve pin o-rings
(23, top or bottom).
Damaged actuator valve springs (16, top or
bottom).
Worn or damaged carriage spool u-cups
(3c). (Characterized by continuous air leak-
age from actuator valve vents.)
Clogged or obstructed valve porting.
Worn out valve housing (3a).
Improper seating or damaged port or valve
housing o-rings (21, 30).
Worn or damaged low pressure u-cup seal
(19).
Worn or damaged high pressure u-cup seal
(20).
SOLUTION
Inspect and replace. See page 21.
Inspect and replace. See page 24.
Inspect and replace. See page 21.
Inspect and replace. See page 21.
Replace. See page 21.
Inspect and replace. See page 24.
Clean.
Replace. See page 24.
Inspect o-ring and groove. Clean or replace as neces-
sary.
Inspect and replace. See page 20.
Inspect and replace. See page 20.
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