Graco PR70 important safety instructions Troubleshooting, Problem Cause Solution

Troubleshooting

Troubleshooting

Before starting any troubleshooting procedures:

1.Relieve pressure (refer to Pressure Relief Procedure Section).

2.Disconnect AC power to the machine.

3.Allow the machine to cool, if the machine has a heat control option.

Try the recommended solutions in the order given for the each problem to avoid unnecessary repairs. Also verify all circuit breakers, switches, and controls are properly set and wiring is correct before assuming there is a problem.

PROBLEM

CAUSE

SOLUTION

	No Power	Verify rear AC Power switch is ON.
	Fuse Blown	Replace Machine fuses (Refer to “Miscellaneous
HMI Display Completely Dark		Mechanical Assemblies” Section).
	Loose connection	Tighten 5 pin cable on HMI.
	Bad HMI	Replace HMI
	Ball Valve Closed	Open Tank Ball Valve (if installed).
No or incorrect amount of	Tank empty	Fill tank with material
	Tank Clogged	Verify no obstruction in the tank
material dispensed from either
	Air in material	Prime the machine until the air is removed.
side
	Check valve malfunction	Remove, clean or replace check valve.
	Piston worn or broken	Remove and replace piston if worn.
	Input Air Reduced or	Re-connect input air line to machine. Increase
	removed	air pressure regulator adjustment.
	Mixer blocked	Replace static mixer. Incorporate or decrease
Piston stalled (E21 Error)		purge time amount to prevent mixer blockage.
	ODV adjustment too late	Re-adjust the ODV setting to occur sooner (C3
		screen section).
	Blocked Check valve	Remove check valve, clean and replace.
	Air Cylinder Failure	Remove air cylinder and re-install cylinder kit
		items if necessary.
Significant material leaking	Pump Shaft worn	Remove pump shaft assembly, and re-install rear
from pump rear seal		pump re-built kit.
	Specific gravity of 1 or more	Mix materials in tanks, dispense another shot,
	of the 2 materials has	then re-weigh. Re-calibrate if necessary (C4
	changed since calibration.	section).
	Machine Air pressure has	Re-adjust air pressure regulator to value used
	changed since calibration.	when machine was calibrated, or re-calibrate (C4
Material dispensed not correct		section). Turn ON or decrease	% level.
weight	Not enough material in 1 or	Check tank levels, and fill and prime if
	more tanks	necessary.
	Mixer has slight obstruction	Replace static mixer. Re-prime machine.
	Check valve malfunction	Remove check valve(s), clean or replace if
		necessary.
	Piston worn or broken	Remove and replace piston(s) if necessary.
	One tank is empty	Check tank levels. Add material if necessary.
	Tank Ball valve Closed	Open tank ball valve. Re-prime machine.
Machine dispensing off ratio	Machine out of phase	Re-phase machine (C2 section).
	Check valve malfunction	Remove check valve(s), clean or replace if
		necessary.
	Piston worn or broken	Remove and replace piston(s) if necessary.
Pumps drawing material back	Check valve stuck open	Remove check valve(s), clean or replace if
from valve hose		necessary.

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