![background image](http://html.mh-extra.com/html/graco/hydroshield-wabh00/hydroshield-wabh00_instructions-parts-manual_2251562074.webp)
Problem
Problem
Problem
Diagnosis
Diagnosis
Diagnosis
Solution
Solution
Solution
Incorrect voltage level display
Check system voltage using a
probe (236003).
Calibrate the bleed resistor as
described in
Check or replace the kV
board as described in
Ground Rod Delay setting.
Adjust the Ground Rod Delay
setting on the System screen. See
.
The ground rod (18) does not
lower.
Follow the procedure in
Check and Lubricate the Ground
Rod, page 69
Voltage is still present at the gun
after the trigger is released.
The ES request input is still active.
Remove the ES request input
signal.
Air pocket in the fluid line leaves
fluid isolated near the gun.
Determine cause and correct.
Purge air from the fluid line.
Voltage is still present at
the gun after following the
Fluid Voltage Discharge and
Grounding Procedure, page 29
.
Issue with the door switch.
Check the door
switch as described in
Check the Door Switch, page 70
.
Paint goes backward toward the
paint supply.
Faulty inlet valve and check valve.
With the shuttle down, test the
Shuttle Fluid In, Pump Fluid In, and
Pump Pressure valves individually
on Maintenance Screen 4. If fluid
is in valves at the same time as
there is pump pressure, this can
result in fluid back-flowing if a
check valve is not present.
See
Check for a leaky check valve.
Other issues
Paint build-up on the isolation
valve stem.
1.
Dirty wash fluid can no longer
clean properly.
2.
The U-cup seals are not wiping
the isolation valve stem clean.
3.
The isolation valve stem (222)
o-ring is not sealing fully.
1.
Follow the steps in
.
2.
Replace wash fluid U-cups as
seen in repair section.
3.
Replace the isolation valve
stem o-ring as described in
Replace the Isolation Valve
Stem O-rings, page 96
74
3A8492A