Troubleshooting - Graco EcoQuip 2 Operation, Repair, And Parts

Troubleshooting

Troubleshooting Troubleshooting
Problem Problem Problem
Unable to fill or
pressurize the pot
with water.
The blast hose recoils
heavily when the blast
control switch (B) is
engaged. Large slugs
of abrasive and water
are ejected from nozzle.
3A3489E
Cause Cause Cause
The emergency stop (Q) is
engaged.
The air supply is inadequate.
Inadequate water supply to
the pump
The water pump air regulator
is malfunctioning.
The water pump is
malfunctioning.
The pop-up cannot seal.
The water pressure regulator
is malfunctioning.
The abrasive ball valve was
left open during shut down.
The abrasive ball valve is
worn.
The pinch hose is worn.
Disengage the emergency stop (Q).
Make sure the air compressor is capable of supplying
the minimum air flow requirement for your system (see
Technical Specifications, page
pressure gauge reads 100-175 psi (6.8–12 bar, 0.68–1.2
MPa). If the gauge does not read 100–175 psi, check the air
compressor for proper setup. Make sure the air inlet filters
are clean, and replace if necessary.
Systems Systems Systems with with water with water water tanks: tanks: Make sure the water tank is full tanks:
and the inlet ball valve is open. Clean or replace water inlet
filter if necessary. Make sure all fitting connections are tight.
Systems Systems with Systems with with pressurized pressurized supply pressurized
supply connection is connected and pressurized. Check
that water supply meets appropriate pressure and flow
requirements, see Setting Up the Equipment, page 14
1. Ensure all fitting connections are tight. Check inlet water
pressure regulator for proper flow direction installation
see EQm Parts, page 34, or
inlet water pressure regulator screen filter for debris, clean if
possible. Replace regulator if no flow can be passed through
regulator.
Disengage the blast control switch (B). Adjust the pump inlet
air pressure regulator until the pump air pressure regulator
gauge reads 100 psi (6.9 bar, 0.69 MPa). If you are unable
to attain this setting, check the air inlet filters and make sure
the supply air pressure is greater than or equal to 100 psi. If
the above steps do not resolve issue, replace the pump air
pressure regulator.
Rotate 3-way selector valve to OFF position. Open rinse
valve and ensure pump cycles, and water flows from rinse
hose. Close rinse valve and verify that pump stalls. If pump
continues to creep or will not prime, refer to manual 333397
for pump service.
Make sure the pop-up is clean and free of debris in the o-ring
sealing area. Check for proper pop-up alignment in the closed
position (there should be no gaps between the o-ring and the
pop-up). Remove the o-ring and make sure the o-ring gland
is clear of debris. Replace the o-ring and/or pop-up if worn.
Adjust the water pressure regulator until the pot pressure
gauge reads 185 psi (12.75 bar, 1.275 MPa). If this
adjustment is not possible, service the water pressure
regulator (see manual 309474).
See Shutting Down, page
With the pot pressurized and the abrasive ball valve closed,
engage the blast control switch (B) and check to make sure
the pump is stalled. If the pump rod is creeping, replace the
abrasive ball valve (M).
With the pot pressurized and the abrasive ball valve
open, check to make sure the pump is stalled. If the
pump rod is creeping, replace the pinch hose. See
Replacing the Pinch Hose, page
Troubleshooting
Solution Solution Solution
67). Make sure the air inlet
supply connection: supply connection: Ensure water connection:
EQs2 Parts, page 40. Check
21, step 2.
32.
step
25