GRACO REACTOR – PROPORTIONER TROUBLESHOOTING
Contents
1. RELIEF SPRAY valve SA or SB are plugged Clear Replace rupture disk 216 with a new one do not replace with a pipe plug Check feed pump pressure and adjust to 100 psi 0 7 MPa 7 bar minimum 252. GRACO REACTOR PROPORTIONER TROUBLESHOOTING Proportioning System Before performing any troubleshooting procedures 1 Relieve pressure page 28 PROBLEM 2 Turn main power OFF Problems Try the recommended solutions in the order given for each problem to avoid unnecessary repairs Also determine that all circuit breakers switches and con trols are properly set and wiring is correct before assum ing there is a problem SOLUTION Proportioning pump does not hold Pump piston or intake valve leaking 1 Observe gauges to determine pressure when stalled which pump is losing pressure Determine in which direction the pump has stalled by observing which directional valve indicator light is on See Table 2 page 26 to isolate the problem Repair the valve see pump man ual 312068 Material imbalance See Pres Restriction at the gun Clean the gun see your separate sure Material Imbalance page 26 gun manual Inadequate flow from pump cavita Increase fluid supply to proportioning tion pump e Use 2 1 supply pump e Use minimum 3 4 in 19 mm ID supply hose as short as practical Fluid is too thick Consult your mate rial supplier for the recommended fluid temperature to maintain a vis cosity of 250 to 1500 centipoise Clean inlet strainer screen page 45 Worn pump inlet valve ball seat or gasket Replace see pump manual 312068 Pressure relief circulation valve leak Remo
3. ve return line and determine if ing back to supply 24 flow is present while in SPRAY Ta mode 312063R PROBLEM CAUSE SOLUTION Pumps do not reverse direction or pumps do not move See Pumps Do Not Reverse Direc tion page 27 Bent or loose activator plate rocker arm or reversing switch Loose piston packing bolt Faulty directional valve Pump cavitation See Pumps Do Not Reverse Direc tion page 27 See Pumps Do Not Reverse Direc tion page 27 Erratic pump movement Feed pump pressure is too low Adjust pressure to maintain 100 psi 0 7 MPa 7 bar minimum Fluid is too thick Consult your mate rial supplier for recommended fluid temperature to maintain a viscosity of 250 to 1500 centipoise See Pumps Do Not Reverse Direc tion page 27 Faulty directional valve Replace directional valve Obstructed fluid hose or gun fluid Open clear use hose with larger ID hose ID too small Worn piston valve or intake valve in See pump manual 312068 displacement pump Loose activator plate rocker arm or reversing switch Pump output low Inadequate feed pump pressure Check feed pump pressure and adjust to 100 psi 0 7 MPa 7 bar minimum Fluid leak at pump rod seal Worn throat seals Replace See pump manual 312068 No pressure on one side Fluid leaking from pump outlet rup ture disk 216 Inadequate feed pump pressure 312063R Check if heater 2 and PRESSURE
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