Graco Inc 222700 Poor Electrostatic Wrap Troubleshooting, Gun Operation Troubleshooting, Problem

Troubleshooting

Poor Electrostatic Wrap Troubleshooting

Problem	Cause	Solution
The system is holding voltage but	The distance between the gun and	Adjust the spraying distance to 8 to
there is poor electrostatic wrap on	workpiece is incorrect.	12 inches (203 to 305 mm).
the part being sprayed
	The parts are poorly grounded.	Clean the workpiece hangers; check
		for proper grounding on the conveyor
		or track.
	Booth exhaust velocity is too high.	Reduce the exhaust velocity within
		the code limits.
	The atomizing air pressure is too	Reduce the atomizing air pressure.
	high.
	The fluid pressure is too high.	Reduce the fluid pressure.
	The fluid viscosity is not right for	Check with the supplier for proper
	electrostatic spray.	fluid viscosity for electrostatic spray.

Gun Operation Troubleshooting

Problem

Cause

Solution

Fluid leakage from the fluid pack-	The fluid rod packings or fluid rod are	Replace the packings or rod; see
ing area	worn.	page 33.
	The packing nut is loose	Tighten the packing nut; see page 33.
Air leakage from the front of the	The air valve is not seating properly.	Clean and service the air valve; see
gun		page 36.
	The air valve o-ring is sticking.	Lubricate the o-ring; see page 36.
Fluid leakage from the front of the	The fluid rod is worn or damaged.	Replace the fluid rod; see page 33.
gun
	The fluid seat is worn.	Replace the fluid nozzle and/or elec-
		trode needle; see pages 30 to 32.

The fluid packing is too tight.

Lubricate and adjust the packing nut; see page 33.

The resistor stud is loose.

Tighten the resistor stud; see page 30.

	The fluid nozzle is loose.	Tighten the fluid nozzle; see page 30.
	The resistor stud o-ring is damaged.	Replace the o-ring; see page 30.
“Orange Peel” finish	The air pressure is insufficient for	Increase the air cap air pressure by
	good atomization.	opening the atomizing air valve more
		or increasing the gun air inlet pres-
		sure; use the least air pressure need-
		ed for good results.
	The fluid is poorly mixed or filtered.	Remix or refilter the fluid.
	An improper thinner is being used.	Use the proper thinner.

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