Air Motor Will Not Run All Models - Graco N22DT0 Instructions-Parts List Manual

Troubleshooting

Air Motor will not run all models

Symptom
Motor stuck at top or
bottom stroke of piston.
Poppet valve (12-NXT100)
or valves leaking
constantly though poppet
muffler (58-120206)
exhaust.
Air blowing out rear main
motor exhaust.
16
Cause
Air pressure is set below 20
psi (140 kpa, 1.4 bar).
poppet pin seat has debris
or is damaged on top
poppet valve (12-NXT100).
Binding/sticking of air valve
cup/carriage
(108-NXT138). or piston
valve (119-NXT142).
Binding/sticking spring
loaded detent
(113-NXT145).
Poppet valve stuck open
exhausting air through
muffler in mid stroke.
Worn or damaged motor
piston o-ring (17).
Worn or damaged air valve
cup/carriage
(108-NXT138).
Damaged valve plate seal
(104-15F435).
Check Procedure
Increase air pressure to 20 psi
(140 kpa, 1.4 bar) or greater.
Reverse the poppet valves
(12-NXT100), and see if
problem moves to opposite
side. Note: Make sure o-ring
(12d) and backup ring (12c) do
not remain in the end cap
casting.
Remove air valve cover
(112-16A038) and check for
binding/sticking of air valve
cup/carriage (108-NXT138) or
piston valve (119-NXT142)
Note: be careful removing
Gasket (106-15H634).
Remove air valve cover
(112-16A038) and check for
binding/sticking of spring
loaded detent (113-NXT145)
Note: be careful removing
Gasket (106-15H634).
Stall air motor under load in
the middle of the stroke,
remove top cover (30) and
check for leak through #58
poppet muffler (120206) on
top cap plate (1-15F955),
and/or for leak through poppet
muffler (58-120206) in bottom
motor cover (3-NXT202).
Stall air motor under load in
the middle of the stroke, check
for air exhausting from rear
main motor exhaust.
Solution
Verify air pressure is 20 psi (140 kpa, 1.4
bar) or greater.
Clean or replace poppet valve
(12-NXT100) Note: Problem poppet is
typically opposite from where motor
stops, because at the last changeover
this poppet stuck open, preventing the
next changeover.
Remove air valve cup/carriage
(108-NXT138) and/or piston valve
(119-NXT142), check for nicks or burrs,
grease and reassemble. Replace air
valve cup/carriage (108-NXT138) or
piston valve (119-NXT142)
Remove air valve cover (112-16A038)
and spring loaded detent (113-NXT145).
Clean, inspect, grease, and reassemble.
Remove and clean poppet valve. Note:
make sure o-ring (12d) and back-up ring
(12c) do not remain in end cap castings
prior to re-assembly.
Replace motor piston o-ring (17).
Models:
2200 -123196
3400- 122434
6500- 122675
Remove air valve cover (112-16A038)
and check for binding/sticking of air valve
cup/carriage (108-NXT138). Note: be
careful removing gasket (106-15H634).
Replace air valve cup (108-NXT138)
Replace valve plate seal (104-15F435).
311238ZAM