Troubleshooting - Graco EcoQuip 300 Operation, Repair, And Parts

Troubleshooting

Troubleshooting Troubleshooting
Problem
Problem Problem
The pot will not properly
pressurize.
The blast pressure will not
reach the desired set point.
334667G
Cause
Cause Cause
The air supply is inadequate.
The Emergency Stop is engaged.
Inadequate water supply to the pump.
The pot pressure regulator is set too
low.
The pop–up cannot seal properly.
The Auto-Vent valve will not seal.
The pot pressure relief valve is
discharging water.
The pot or pump is leaking pressure.
The pot pressure regulator is
malfunctioning.
The air supply is inadequate.
The blast air regulator is
malfunctioning.
The main air regulator is
malfunctioning.
Troubleshooting
Solution
Solution Solution
Make sure the air inlet pressure gauge reads
100-125 psi (6.8–8.6 bar, 0.68–0.86 MPa). If
the gauge does not read 100–125 psi, check
the air compressor for proper setup.
Disengage the Emergency Stop.
Make sure the water tank is full and the inlet
ball valve is open.
Increase the setting on pot pressure regulator.
Clean all abrasive from the pop-up and
gasket. Make sure the pop-up spring is lifting
and the pop-up is firmly against the gasket.
If cleaning does not solve issue, replace the
pop-up gasket.
See Cleaning the Auto-Vent Valve, page
Decrease the pot pressure to 145 psi (10.3
bar, 1.03 MPa) or less. If the valve weeps or
relieves at 145 psi, replace valve.
Make sure the abrasive ball valve and
the dump valve are closed. If pot
pressure gauge still creeps downward.
See Checking for Leaks, page
Replace the pot pressure regulator assembly.
Make sure the air inlet pressure gauge reads
100-125 psi (6.8–8.6 bar, 0.68–0.86 MPa). If
the gauge does not read 100–125 psi, check
the air compressor for proper setup.
Replace the blast air regulator.
See Repairing the Main Air Regulator, page
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