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Graco 715 User Manual

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11 
TROUBLESHOOTING 
 
 
If operating difficulties are encountered, review the symptoms below. With each problem there are one or more 
possible causes that should be investigated to resolve the situation. 
 
NOTHING HAPPENS - If absolutely nothing happens when trying to cycle the Dispense Head, check the electric 
pneumatic power. Check the footswitch or cycle start switch to be sure it is plugged in. 
 
VALVE CYCLES, NOTHING DISPENSED - First, try to purge the unit; this should fix most situations. If it doesn’t, 
check to see that there is enough pressure to the reservoir or transfer pump. Perhaps the 
Reservoir/Nozzle/Needle path is clogged; examine and clear or replace as necessary. Consider whether the 
material could have set up in the system. (See the “Wet System Checkout” and “Operation Adjustments” 
sections.) 
 
IRREGULAR VOLUME DISPENSED - Frequently, this is caused by faulty material. The material must be a 
smooth (homogeneous) mixture, without any air entrapped in it.  A second cause could possibly be that the 
material is not being supplied. Check the reservoir pressure as it may be too low for the type of material being 
dispensed and/or the rate at which the system moves the dispense valve may be too fast. To adjust, follow the 
directions found in the “Operation Adjustments” section of this manual. 
 
REDUCED VOLUMES DISPENSED - Check to see if Nozzle/Needle is partially clogged (refer to “Periodic 
Maintenance” section). 
 
NO MATERIAL DISPENSED - This is due to a clogged Nozzle/Needle (refer to “Periodic Maintenance” section). 
 
MATERIAL CONTINUES TO FLOW AFTER SHUT OFF – This can be typical for the material and can often be 
compensated for by adjusting the amount of Snuff-Back.   See the Material Output and Snuff-Back Adjustments 
section under Operation Adjustments.  More extreme situations can be due to material preventing the Spool from 
seating properly into the Posipak Seal seat or to a worn Spool and/or seat.  Refer to “Periodic Maintenance” for 
the Wet Section, clear the blockage or replace the worn components.