Troubleshooting - Graco A Series Instructions - Parts Manual

Troubleshooting

Troubleshooting
Follow the Pressure Relief Procedure, page 8, before checking or repairing the equipment.
To repair the regulator, refer to Repair on page 11.
Problem
No fluid flow. Plugged fluid inlet.
Exhausted fluid supply.
No air inlet pressure.
Ruptured air diaphragm (15).
Ruptured fluid diaphragms (9a, 9b).
Low fluid flow. Incorrect ratio.
Fluid supply pressure is too low.
Air inlet pressure is too low.
High fluid flow. Incorrect ratio.
Air inlet pressure is too high.
Erratic fluid Damaged fluid diaphragms (9a, 9b).
flow.
Ruptured air diaphragm (15).
Ruptured fluid diaphragms (9a, 9b).
Inconsistent air inlet pressure.
Inconsistent fluid inlet pressure.
Fluid flow will Dirty needle (6) and seat (5).
not shut off.
Inlet air is not shut off.
Seat retainer (7) is loose.
Broken spring (13).
Regulator is Screws (17) are loose.
leaking fluid.
Ruptured fluid diaphragms (9a, 9b).
Loose fluid fitting.
Regulator is Loose air fitting.
leaking air.
Screws (17) are loose.
Ruptured air diaphragm (15).
10
Cause Solution
Flush fluid line and regulator.
Check fluid supply and supply pump.
Check air inlet pressure.
Replace. See page 11.
Replace. See page 11.
Use correct spacer (3) and ratio piston (14) for desired
ratio. See Change the Ratio, page 11.
Increase fluid pressure. Do not exceed 300 psi (2.1
MPa, 21 bar).
Increase air inlet pressure.
Use correct spacer (3) and ratio piston (14) for desired
ratio. See Change the Ratio, page 11.
Decrease air inlet pressure.
Replace. See page 11.
Replace. See page 11.
Replace. See page 11.
Check air inlet pressure.
Check fluid inlet pressure.
Remove and clean. Replace if worn or damaged. See
page 11.
Shut off inlet air.
Tighten.
Replace spring (13). See page 11.
Torque oppositely and alternately to 25 in-lb (2.8 N•m).
Replace. See page 11.
Tighten.
Tighten.
Torque oppositely and alternately to 25 in-lb (2.8 N•m).
Replace. See page 11.
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