Troubleshooting - Graco EcoQuip 300 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 pot bung cannot seal properly. Clean all abrasive from the bung and
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 main air regulator is
malfunctioning.
The blast air regulator is
malfunctioning.
Solution
Solution Solution
Make sure the air inlet pressure gauge
reads 100-125 psi. 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.
seal. Make sure the bung spring is lifting
and the bung is firmly against the seal. If
cleaning does not solve issue, replace
bung seal.
See Cleaning the Auto-Vent Valve, page
31.
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 (Kit 17D785).
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 (17C132).
Make sure the air inlet pressure gauge
reads 100-125 psi. If the gauge does
not read 100–125 psi, check the air
compressor for proper setup.
See Repairing the Main Air Regulator,
page 28 (EQ600 – Kit 17C131, EQ300
– Kit 17C129).
Replace the blast air regulator (Kit
17C625).
26.
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