Proportioning
Proportioning
Proportioning System
System
System
Before performing any troubleshooting
procedures:
1. Follow
Pressure Relief Procedure, page 49
.
2. Turn the main power switch OFF.
3. Allow equipment to cool.
Problems:
Problems:
Problems:
Try the recommended solutions in the order
given for each problem, to avoid unnecessary
repairs. Also, determine that all circuit breakers,
switches, and controls are properly set and
wiring is correct before assuming there is a
problem.
PROBLEM
PROBLEM
PROBLEM
CAUSE
CAUSE
CAUSE
SOLUTION
SOLUTION
SOLUTION
Proportioning pump does not
hold pressure when stalled.
Pump piston or intake valve
leaking.
1. Observe gauges to
determine which pump
is losing pressure.
2. Determine in which direction
the pump has stalled by
observing which directional
icon is displayed on the ADM
Home screen. See Table 1.
3. Repair the valve. See pump
manual.
Restriction at the gun.
Clean the gun; see your separate
gun manual.
Increase fluid supply to
proportioning pump:
• Use 2:1 supply pump
• Use minimum 3/4 in. (19 mm)
ID supply hose, as short as
practical
Fluid is too thick. Consult
your material supplier for the
recommended fluid temperature
to maintain a viscosity of 250 to
1500 centipoise.
Clean inlet strainer screen.
Inadequate flow from pump;
cavitation.
Worn pump inlet valve ball/seat
or gasket. Replace pump.
Material Imbalance. See
Pressure/Material Imbalance,
page 41
Pressure relief/circulation valve
leaking back to supply.
Remove return line and
determine if flow is present
while in SPRAY mode.
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