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Troubleshooting
311239H 7
Troubleshooting
Problem Cause Solution
Excess air leaking from regulator
housing, or gauge shows unstable
regulated pressure.
Loose or worn diaphragm (17d). Tighten housing or repair regulator
using repair kit NXT095. See page
10.
Worn seat (17e) or poppet (17f). Repair regulator using repair kit
NXT095. See page 10.
Main spool seals or relief valve worn. Replace with spool kit NXT098,
page 10.
Quick exhaust poppet (20b) or seat
(20a) worn.
Replace with quick exhaust repair kit
NXT099, page 10.
Air leaking from quick exhaust vent
hole.
Worn poppet o-ring (20c). Replace with quick exhaust repair kit
NXT099, page 10.
Quick exhaust poppet (20b) or seat
(20a) worn.
Replace with quick exhaust repair kit
NXT099, page 10.
Air leaking from ball valve vent hole. Loose inlet fitting (32a). Tighten inlet fitting. See page 11.
Worn valve seals (32b, 32d). Repair ball valve using repair kit
NXT097. See page 11.
Regulator does not regulate pres-
sure.
Worn spool o-rings or worn/damaged
diaphragm (17d).
With air on and bleed-type master air
valve (B) open, unscrew the regulator
housing (19).
• If pressure drops, diaphragm is
damaged. Install Repair Kit
NXT095, page 10.
• If air leaks out bottom orifice,
spool o-rings are worn. Install
Repair Kit NXT098, page 10.
Gauge will not go to 0 when ball valve
is open and knob is turned coun-
ter-clockwise to 0.
Washer (17c) is on wrong side of dia-
phragm (17d).
Move washer (17c) to spring side of
diaphragm.
Pilot air seat (17e) is not fully seated. Turn pilot air seat (17e) in until if fully
seats.
Seal (3) is too thin or damaged caus-
ing air to leak into pilot air chamber.
Replace snail seal (3). Seal should
have a minimum thickness of 0.065
in. (1.65 mm).