Graco Geo Blaster GB1200, Operation And Parts

Page: 19 / 54

Troubleshooting
3A4167C 19
Troubleshooting
Problem Cause Solution
Blast pot will not properly pressurize Air supply is inadequate. Make sure the air inlet pressure
gauge reads 100-150 psi (6.8–10 bar,
0.68–1.0 MPa). If the gauge does not
read 100–150 psi, check the air com-
pressor for proper setup.
Emergency Stop is engaged. Disengage the Emergency Stop.
Inadequate water supply to the
pump. Make sure the water tank is full and
the inlet ball valve is open.
Pop-up cannot seal properly. Clean all abrasive from the pop-up
and o-ring seal. Make sure the
pop-up spring is lifting the pop-up
firmly against the o-ring. If cleaning
does not solve the issue, replace
o-ring.
Blast pot pressure relief valve is dis-
charging water. Decrease the pot pressure to 145 psi
(10 bar, 1.0 MPa) or less. If the valve
weeps or relieves at 145 psi, replace
valve.
Blast pot or pump is leaking pres-
sure. Make sure the abrasive ball valve
and the dump valve are closed. If pot
pressure gauge still creeps down-
ward, check for leaks.
Blast pressure will not reach the
desired set point Air supply is inadequate. Make sure the air inlet pressure
gauge reads 100-150 psi (6.8–10 bar,
0.68–1.0 MPa). If the gauge does not
read 100–150 psi, check the air com-
pressor for proper setup.
Blast air regulator is malfunctioning. Replace the blast air regulator.
M
ain air regulator is malfunctioning. Confirm that there are no air leaks in
the fittings or tubing from the blast air
regulator to the main air regulator.
Confirm that the mounting bolts for
the main air regulator’s diaphragm
housing are tight.
Rebuild the main air regulator.