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Troubleshooting
8 311239H
Gauge pressure increases above set
point pressure.
Leak across rear spool (8) o-ring,
which raises pilot air pressure even
while spraying.
Replace spool assembly (8) with
spool kit NXT098.
Leak across front spool (8) o-ring,
which raises air motor pressure when
stalled.
Replace spool assembly (8) with
spool kit NXT098.
Spool assembly (8) sticking. Clean and lubricate spool (8). Add oil
to filter cup and run motor. Or, add a
lubricator to air supply.
Seal (3) leaking. Replace snail seal (3). Seal should
have a minimum thickness of 0.065
in. (1.65 mm).
Side hole or through vent plugged on
diaphragm tube (17d).
Clean through vent and side 0.015 in.
(0.381 mm) hole.
Air pressure drops when pump is
cycling.
Air hose has too small of an inside
diameter.
Use a 3/4 in. ID air hose.
Air supply is not adequate. (Check
gauge between hose and inlet.)
Use a larger air compressor.
Air filter (6) is plugged. Replace air filter with kit NXT092. Or,
upgrade to a larger coalescing filter
with a manual drain (NXT094), or
with an automatic drain (NXT093).
See Accessories (page 13) and
manual 406659.
Problem Cause Solution