Troubleshooting
22 312063Z
Proportioning System
Before performing any troubleshooting procedures:
1. Relieve the pressure. See Pressure Relief
Procedure, page 26.
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 valve indicator
light is on. See Table 2, page 24
to isolate the problem.
3. Repair the valve; see your pump
manual.
Material imbalance. See
Pressure/Material Imbalance, page
24.
Restriction at the gun. Clean the gun; see your separate
gun manual.
Inadequate flow from pump;
cavitation.
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, Inlet
Fluid Strainer Screen, page 43.
Worn pump inlet valve ball/seat or
gasket. Replace, see your pump
manual.
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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