Troubleshooting - Graco EcoQuip EQ200T Operation, Repair, And Parts

Troubleshooting

Troubleshooting
Troubleshooting Troubleshooting
Problem
Problem Problem
The pot will not properly
pressurize.
The blast pressure will
not reach the desired set
point.
22
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. Clean all abrasive from the pop-up and gasket.
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.
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.
Make sure the pop-up spring is lifting and the
pop-up is firmly against the seal. If cleaning
does not solve issue, replace 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
27.
30.
25.
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