Troubleshooting
Proportioning System
Before pe rforming any troubleshooting procedures:
1. Follow Pressure Relief Procedure, page 49.
2. Turn main power O FF.
3. A ll ow equipme nt to cool .
Problems:
Try the recommended solutions in the order given for
each problem, to avoi d unnecess ary 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
whichpumpislosingpressure.
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 in let valve ball/seat or
gasket. Replace pump.
Mate rial 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.
40 334946A
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