Graco 309550Y important safety instructions Troubleshooting, Problem Cause Solution

Troubleshooting

Troubleshooting

1. Follow Pressure Relief Procedure, page 15,			2. Check all possible problems and causes before
before checking or repairing gun.			disassembling gun.
				CAUTION
			To prevent cross-contamination of the gun’s wetted
			parts, do not interchange A component (isocyanate)
			and B component (resin) parts.
PROBLEM		CAUSE		SOLUTION
Gun does not fully actuate when trig-	Safety lock engaged.			Disengage safety lock, page 10.
gered.
	Plugged muffler (22).			Clean, page 20.
	Damaged air valve o-rings (24).			Replace, page 33.
Fluid does not spray when gun is fully	Closed fluid valves (12b).			Open.
actuated.
	Plugged impingement ports.			Clean, page 21.
	Plugged check valves (26).			Clean, page 31.
Gun actuates slowly.	Plugged muffler (22).			Clean, page 20.
	Damaged piston o-rings (16, 17).			Replace, page 32.
	Dirty air valve, or damaged o-rings			Clean air valve or replace o-rings,
	(24).			page 33.
Gun delays, then actuates abruptly.	Cured material around side seals			Inspect side seals (18c) and mix
	(18).			chamber (19) for scratches. Replace,
				page 29.
	Retaining ring (9) not bottomed out.			Tighten retaining ring until bottomed
				out.
Loss of round pattern.	Dirty mix chamber nozzle.			Clean, page 21.
Loss of flat pattern.	Plugged spray tip.			Clean in compatible solvent, page 18.
	Worn tip.			Replace, page 18.
	Dirty mix chamber nozzle.			Clean, page 21.
Leakage between flat tip and mix	Tip not seated properly.			Reassemble, page 18.
chamber.
	Damaged/missing o-ring (40).			Replace, page 18.
Pressure imbalance.	Plugged impingement ports.			Clean, page 21.
	Plugged check valves (26).			Clean, page 31.
	Viscosities not equal.			Adjust temperature to compensate.

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