Proportioning System
Before performing any troubleshooting procedures:
1. Follow
Pressure Relief Procedure, page 49
2. Turn main power OFF.
3. Allow equipment to cool.
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
CAUSE
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 relief/circulation valve
leaking back to supply.
Remove return line and determine
if flow is present while in SPRAY
mode.
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334946A