Graco 238890 - Troubleshooting

Troubleshooting
12 308647T
Troubleshooting
Follow the Pressure Relief Procedure, page 10,
before checking or repairing the equipment.
NOTE: check all possible solutions in the chart below
before you disassemble the regulator.
Problem Cause Solution
No pressure regulation Damaged diaphragm Replace diaphragm.
Leaking or dirty seat Replace cartridge, or clean seat.
No fluid flow Damaged valve actuation Replace valve actuator.
Pressure creeps above setting Metal chip or contamination
between ball and seat
Replace cartridge, or clean seat
area.
Damaged diaphragm Replace diaphragm.
Damaged o-ring or improper seal Replace the o-ring under the seat.
Damaged or clogged air regulator or
line (air-operated regulator only)
Clear obstruction in line. Service
regulator if necessary.
Leaking or dirty seat Replace cartridge, or clean seat.
Large change in inlet pressure Stabilize regulator inlet pressure.
Pressure drops below setting Empty/clogged supply line Fill/flush supply line.
Damaged or clogged air regulator or
line (air-operated regulator only)
Clear obstruction in line. Service
regula- tor if necessary.
Using valve beyond its rated flow
capacity
Install valve for each spray gun or
dispensing valve.
Large change in inlet pressure Stabilize regulator inlet pressure.
Fluid leaks from spring housing Loose fluid housing Tighten the four cap screws.
Damaged diaphragm Replace diaphragm.
Chatter Excessive pressure differential
between pump and gun
Reduce pump pressure to not more
than 2000 psi (14 MPa, 138 bar)
greater than required gun pressure.
Excessive flow rate Reduce fluid flow through regulator.
Connect only one spray gun or
dispensing valve to each fluid
regulator