16 309117
Troubleshooting
WARNING
INJECTION HAZARD
To reduce the risk of a fluid injection
injury, follow the
Pressure Relief Proce-
dure
on page 9 before checking or
servicing any of the system equipment and when-
ever you are instructed to relieve pressure.
NOTE:
Check all possible remedies in the troubleshooting
charts before disassembling the gun.
Some improper patterns are caused by the
improper balance between air and fluid.
General Troubleshooting
Problem
Cause
Solution
Fluid leakage from back of fluid
packing area
Worn packings or needle shaft
Replace entire needle assembly (12).
Air leakage from front of gun
Air valve not seating properly
Clean or replace air valve (23).
Fluid leakage from front of gun
Needle ball worn or damaged
Replace entire needle assembly (12).
g
g
Worn seat assembly
Replace the seat assembly (13) and
gasket (12b). The gasket must be
replaced whenever the seat assembly
is removed.
Fluid in air passages
Spray tip seal leaking
Tighten tip guard assembly (18) or
replace spray tip (33).
Leaking around seat housing
Replace the gasket (12b). The gasket
must be replaced whenever the seat
assembly is removed.
Fluid inlet fitting leaking
Replace the fluid tube gasket (7). The
gasket must be replaced whenever
the fluid tube connector is removed.
Slow fluid shut-off
Fluid buildup on fluid needle compo-
nents
Remove and clean or replace the
fluid needle assembly (12).
No fluid output when triggered
Tip orifice plugged
Fluid hose plugged
Very slowly
loosen tip guard assem-
bly (18), air cap (14), and spray tip
(33). Clean the tip orifice.
After tip removal (see above),
very
slowly
loosen the hose end coupling
at the gun and relieve pressure grad-
ually. Then loosen completely to clear
the obstruction.
