Graco 309550Y important safety instructions Troubleshooting, Problem Cause Solution

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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.

309550Y

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Image 23

Contents Plural Component, Impingement Mix Air Purge Spray Gun Manual Conventions ContentsRound Pattern Guns List of Models/Mix Chamber Selection GuideFlat Pattern Guns 249526 Flat Pattern Stud Wall GunNo., Series In. mm In. mm 1000 psi MPa, 70 bar 249525Non 11 Ratio Guns Spatter Pattern GunWide Round Pattern Gun Four-Hose GunPersonal Protective Equipment Fire and Explosion Hazard Key Overall ViewGrounding Piston Safety LockIsocyanate Hazard Keep a and B Components SeparateLoss of Air Pressure Follow Pressure Relief Procedure,Turning Air Cap Resin ISO SetupSetup Shutdown Pressure Relief Procedure Remove Front End, Optional ConfigurationsOptional Fluid Manifold PositionOptional Hose Position Follow Pressure Relief Procedure, page 15. AlsoFlat Spray Tips Maintenance Clean Fluid Manifold Clean Outside of GunClean Air Cap Clean MufflerNozzle Drill Bit Sizes Clean Mix Chamber NozzleClean Passages Clean Impingement PortsCbip Impingement Port Drill Bit SizesProblem Cause Solution TroubleshootingProblem Cause Solution Gun Detriggered Air Purging Theory of OperationGun Triggered Fluid Spraying Cutaway View Remove Front End RepairTools Required LubricationX Z Attach Front EndMix Chamber and Side Seal Cartridges 18 B Check Valves Piston Air Valve Piston Safety LockCheck Valve 26 Detail PartsSee Supplied Tools, Part No. Description QtyRound Pattern Guns, See Flat Pattern Guns,Detail Views Mix Chamber Part No. Reference Guide Mix Chamber KitsRound Pattern Guns Flat Pattern GunsFlat Tip Part No. Reference Guide Flat Tip KitsGun Repair Kits Check Valve Filter Screen KitsKit Part No Qty in Kit Drill Bit Size Illustration Nominal Drill Bit Kits248969 Air Purge Handle Cleanout Drill KitDrill Bit Kit 119386Polycarballoy Side Seal Kits AccessoriesWide Pattern Mix Chamber Kits Stainless Steel Side Seal KitsFlat Pattern Stud Wall Kit Extension Tip KitsExtension Tip Seal Kits Extension Tip Air Cap KitGun Cover Spatter Conversion KitSolvent Flush Canister Kit Pour Nozzle KitCirculation Manifold Tip Cleanout ToolGun Cleaning Kit Category Data Technical DataAir Flow Data in scfm m3/min Toll Free Graco Standard WarrantyGraco Information