Graco 249377, 288217, 249369 General Troubleshooting, Problem Cause Solution

Page 20

Troubleshooting

Troubleshooting

Check all possible remedies in the troubleshooting charts before disassembling the gun.

Some improper patterns are caused by the improper balance between air and fluid. Refer to Spray Pattern Troubleshooting, page 22.

General Troubleshooting

Problem

Cause

Solution

 

 

 

 

 

 

Fluid leakage through venting holes.

Worn packing (17) or needle (5).

Replace packing or needle.

 

 

 

Air leakage through venting hole.

Worn o-ring (9) or gasket (15).

Check and replace parts as needed.

 

 

 

Air leakage from back of gun.

Worn o-rings (8, 9).

Replace o-rings.

 

 

 

Air does not trigger.

Piston stem is disconnected from

Replace piston assembly.

 

main body of piston assembly (3).

 

 

Cylinder air pressure is too low.

Increase cylinder air pressure to 50

 

 

psi.

 

 

 

Air does not shut off.

Piston assembly not seating properly.

Clean/service piston assembly.

 

 

Replace worn or swollen o-rings.

 

Broken return spring (7).

Replace return spring.

 

Swollen o-ring (8).

Replace o-rings.

 

Worn piston stem o-rings (10, 11).

Replace o-rings.

 

Bottom gasket (12) failed.

Replace gasket.

 

 

 

Fluid leakage from front of gun.

Fluid needle tip (5a) is dirty, worn, or

Clean or replace fluid needle tip or

 

damaged.

entire needle (5).

 

Dirty or worn nozzle (23).

Clean or replace nozzle.

 

 

 

Fluid is present at air cap holes.

Nozzle (23) is insufficiently tightened

Tighten or replace o-ring.

 

or sealing o-ring (36) is damaged.

 

 

 

 

20

311051F

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Contents Automatic XT Spray Guns Contents Related ManualsCompliant Airspray ModelsOrifice Size In. mm Equipment Misuse Hazard Toxic Fluid or Fumes Hazard Selection Charts Hvlp Spray Gun AssembliesCompliant Spray Gun Assemblies Airspray Gun AssembliesAir Caps Proper Needle/Nozzle SelectionGun Selection Air Flow Hvlp Gun Air Cap PressureInstallation Ventilate Spray BoothConfigure Gun and Manifold Non-circulating SystemInstall Air Fittings Ground SystemMount Gun Reciprocating Arm Rod MountRetrofit Adapter Plate Stationary SupportConnect Fluid Hose SetupConnect Air Line Flush Spray Gun Position Air CapAdjust Spray Pattern Compliant Hvlp and Compliant Gun LimitsAir Pressure Regulator Pressure Relief Procedure OperationApply Fluid IncorrectDaily Gun Care Perform Pressure Relief Procedure, General System MaintenanceClean and Flush Gun Problem Cause Solution TroubleshootingGeneral Troubleshooting Troubleshooting Spray Pattern Troubleshooting Replace Fluid Packings and Air Seals ServiceItems Needed for Service Alternate Fluid Control Shown Reassembly Parts Exploded View Part No Gun ShownParts Air CapsPart No. Description Qty Orifice Size LargeSpray Gun Assemblies all models Needle TipsManifold with Bottom Fluid Ports Description Qty Manifold with Side Fluid PortsSide Fluid Ports and Fan Adjustment Valve RING, Ptfe Accessories Dimensions Mounting Hole Layout Manifold Mounting Hole LayoutRear Port Manifold Retrofit Adapter Plate Gun with RetrofitTechnical Data Triggering SpeedGraco Standard Warranty Graco Information
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