Proportioning System - Graco Reactor 2 H-30 Repair Parts

Troubleshooting

Proportioning System

System
Proportioning Proportioning System
Before performing any troubleshooting procedures:
1. Follow Pressure Relief Procedure, page
PROBLEM PROBLEM PROBLEM
Proportioning pump does not hold
pressure when stalled.
Material Imbalance. See
Pressure/Material Imbalance,
page 39.
38
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
47.
assuming there is a problem.
CAUSE CAUSE CAUSE
Pump piston or intake valve leaking. 1. Observe gauges to determine
Restriction at the gun.
Inadequate flow from pump;
cavitation.
Pressure relief/circulation valve
leaking back to supply.
SOLUTION SOLUTION SOLUTION
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.
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.
Worn pump inlet valve ball/seat or
gasket. Replace pump.
Remove return line and determine
if flow is present while in SPRAY
mode.
334946H