Troubleshooting - Graco A Series Instructions Manual

NOTE: Check all possible remedies in the
Troubleshooting Chart before disassembling the fluid
regulator.
Problem
No pressure regulation.
Fluid leaks from between the cap
(5) and the housing (20).
Pressure creeps above setting.
Pressure drops below setting.
12 308325

Troubleshooting

Cause
Damaged or clogged air regulator
or line (236281 or 238159).
No flow or pressure to the inlet of
the regulator.
Damaged diaphragm (11*). Damaged diaphragm (11*).
Loose cap (5). Loose cap (5).
Worn gasket (12*). Worn gasket (12*).
Worn o-ring (6*). Worn o-ring (6*).
Damaged or clogged air regulator Damaged or clogged air regulator
or line (236281 or 238159). or line (236281 or 238159). or line (236281 or 238159).
Damaged diaphragm (11*). Damaged diaphragm (11*). Damaged diaphragm (11*). Damaged diaphragm (11*).
Contamination between ball (16*) Contamination between ball (16*) Contamination between ball (16*)
and seat (14*). and seat (14*).
Damaged or clogged air regulator Damaged or clogged air regulator Damaged or clogged air regulator Damaged or clogged air regulator
or line (236281 or 238159). or line (236281 or 238159).
Empty/clogged supply line. Empty/clogged supply line.
Clogged air spray gun or fluid dis- Clogged air spray gun or fluid dis-
pensing valve. pensing valve.
Using regulator beyond its rated Using regulator beyond its rated Using regulator beyond its rated
flow capacity, see Technical Data flow capacity, see Technical Data flow capacity, see Technical Data flow capacity, see Technical Data flow capacity, see Technical Data
on page 17.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 4.
Clear obstruction in line, service
regulator if necessary.
Clear obstruction in the fluid line to
the regulator.
Replace diaphragm.
Tighten screws (18,19) in se-
quence shown in Service section.
Replace gasket.
Replace o-ring.
Clear obstruction in line, service Clear obstruction in line, service
regulator if necessary. regulator if necessary.
Replace diaphragm. Replace diaphragm.
Replace ball (16*), seat (14*), and Replace ball (16*), seat (14*), and Replace ball (16*), seat (14*), and
o-ring (15*). o-ring (15*).
Clear obstruction in line, service Clear obstruction in line, service Clear obstruction in line, service Clear obstruction in line, service
regulator if necessary. regulator if necessary. regulator if necessary. regulator if necessary.
Fill/flush supply line. Fill/flush supply line.
Replace, see gun or valve manual Replace, see gun or valve manual Replace, see gun or valve manual
for service instructions. for service instructions.
Install additional regulators.
Solution